change dir structure

8 files changed, 0 insertions, 7673 deletions

diff --git a/config-db/OpenSLX/AttributeRoster.pm b/config-db/OpenSLX/AttributeRoster.pm
deleted file mode 100644
index 88d6295f..00000000
--- a/config-db/OpenSLX/AttributeRoster.pm
+++ /dev/null
@@ -1,537 +0,0 @@
-# Copyright (c) 2006, 2007 - OpenSLX GmbH
-#
-# This program is free software distributed under the GPL version 2.
-# See http://openslx.org/COPYING
-#
-# If you have any feedback please consult http://openslx.org/feedback and
-# send your suggestions, praise, or complaints to feedback@openslx.org
-#
-# General information about OpenSLX can be found at http://openslx.org/
-# -----------------------------------------------------------------------------
-# AttributeRoster.pm
-#    - provides information about all available attributes
-# -----------------------------------------------------------------------------
-package OpenSLX::AttributeRoster;
-
-use strict;
-use warnings;
-
-use Digest::MD5 qw(md5_hex);
-
-use OpenSLX::Basics;
-use OpenSLX::OSPlugin::Engine;
-use OpenSLX::OSPlugin::Roster;
-use OpenSLX::Utils;
-
-my %AttributeInfo;
-
-#=item C<_init()>
-#
-#Integrates info about all known attributes (from core and from the plugins)
-#into one big hash.
-#Returns info about all attributes.
-#
-#=cut
-#
-sub _init
-{
-    my $class = shift;
-
-    # set core attributes
-    %AttributeInfo = (
-        'automnt_dir' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => '',
-        },
-        'automnt_src' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => '',
-        },
-        'boot_type' => {
-            applies_to_systems => 0,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                Selects the boot technology for this client.
-                Currently the following boot types are supported:
-                    pxe    (is the default)
-                        uses PXE to boot client over LAN
-                    preboot
-                        generates a set of images (see preboot_media) that can
-                        be used to remotely boot the systems referred to by 
-                        this client
-                    pbs
-                        preboot server (experimental)
-            End-of-Here
-            content_regex => qr{^(pxe|preboot|pbs)$},
-            content_descr => '"pxe" or "preboot"',
-            default => 'pxe',
-        },
-        'boot_uri' => {
-            applies_to_systems => 0,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                specifies the wget(able) address of the remote bootloader 
-                archive that shall be loaded from the preboot environment
-            End-of-Here
-            content_regex => undef,
-            content_descr => 'an uri supported by wget',
-            default => '',
-        },
-        'country' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'de',
-        },
-        'hidden' => {
-            applies_to_systems => 1,
-            applies_to_clients => 0,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                specifies whether or not this system is offered for booting
-            End-of-Here
-            content_regex => qr{^(0|1)$},
-            content_descr => '0: system is bootable - 1: system is hidden',
-            default => '0',
-        },
-        'kernel_params' => {
-            applies_to_systems => 1,
-            applies_to_clients => 0,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                params to build kernel cmdline for this system
-            End-of-Here
-            content_regex => undef,
-            content_descr => 'kernel cmdline fragment',
-            default => 'quiet',
-        },
-        'kernel_params_client' => {
-            applies_to_systems => 0,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                client-specific params for kernel cmdline
-            End-of-Here
-            content_regex => undef,
-            content_descr => 'kernel cmdline fragment',
-            default => '',
-        },
-        'preboot_media' => {
-            applies_to_systems => 0,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                List of preboot media supported by this client.
-                Currently the following preboot media are supported:
-                    cd
-                        generates a bootable CD-image that can be used to
-                        remotely boot the systems referred to by this client
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => '',
-        },
-        'preboot_server' => {
-            applies_to_systems => 0,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!experimental!! specifies location of openslx-preboot-server
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => '',
-        },
-        'ramfs_fsmods' => {
-            applies_to_systems => 1,
-            applies_to_clients => 0,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                list of filesystem kernel modules to load
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => '',
-        },
-        'ramfs_miscmods' => {
-            applies_to_systems => 1,
-            applies_to_clients => 0,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                list of miscellaneous kernel modules to load
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => '',
-        },
-        'ramfs_nicmods' => {
-            applies_to_systems => 1,
-            applies_to_clients => 0,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                list of network card modules to load
-            End-of-Here
-            content_regex => qr{^\s*([-\w]+\s*)*$},
-            content_descr => 'a space-separated list of NIC modules',
-            default => 'forcedeth e1000 e100 tg3 via-rhine r8169 pcnet32',
-        },
-        'hw_local_disk' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                how to handle local disk deploament - no/slxonly/all
-            End-of-Here
-            content_regex => undef,
-            content_descr => 'how to handle local disk (no/slxonly/all)',
-            default => 'all',
-        },
-        'scratch' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => '',
-        },
-        'start_atd' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'no',
-        },
-        'start_cron' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'no',
-        },
-        'start_dreshal' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'yes',
-        },
-        'start_ntp' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'initial',
-        },
-        'start_nfsv4' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'no',
-        },
-        'start_snmp' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'no',
-        },
-        'start_sshd' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                !!!descriptive text missing here!!!
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'yes',
-        },
-        'timezone' => {
-            applies_to_systems => 1,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                textual timezone (e.g. 'Europe/Berlin')
-            End-of-Here
-            content_regex => undef,
-            content_descr => undef,
-            default => 'Europe/Berlin',
-        },
-        'unbootable' => {
-            applies_to_systems => 0,
-            applies_to_clients => 1,
-            description => unshiftHereDoc(<<'            End-of-Here'),
-                specifies whether or not this client is allowed to boot
-            End-of-Here
-            content_regex => qr{^(0|1)$},
-            content_descr => '0: client can boot - 1: client is blocked',
-            default => '0',
-        },
-    );
-    
-    # and add all plugin attributes, too
-    OpenSLX::OSPlugin::Roster->addAllStage3AttributesToHash(\%AttributeInfo);
-
-    return 1;
-}
-
-=item C<getAttrInfo()>
-
-Returns info about all attributes.
-
-=over
-
-=item Return Value
-
-An hash-ref with info about all known attributes.
-
-=back
-
-=cut
-
-sub getAttrInfo
-{
-    my $class  = shift;
-    my $params = shift || {};
-
-    $class->_init() if !%AttributeInfo;
-
-    if (defined $params->{name}) {
-        my $attrInfo = $AttributeInfo{$params->{name}};
-        return if !defined $attrInfo;
-        return { $params->{name} => $AttributeInfo{$params->{name}} };
-    }
-    elsif (defined $params->{scope}) {
-        my %MatchingAttributeInfo;
-        my $selectedScope = lc($params->{scope});
-        foreach my $attr (keys %AttributeInfo) {
-            my $attrScope = '';
-            if ($attr =~ m{^(.+?)::}) {
-                $attrScope = lc($1);
-            }
-            if ((!$attrScope && $selectedScope eq 'core') 
-            || $attrScope eq $selectedScope) {
-                $MatchingAttributeInfo{$attr} = $AttributeInfo{$attr};
-            }
-        }
-        return \%MatchingAttributeInfo;
-    }
-
-    return \%AttributeInfo;
-}
-
-=item C<getStage3Attrs()>
-
-Returns the stage3 attribute names (which apply to systems or clients).
-
-=over
-
-=item Return Value
-
-An array of attribute names.
-
-=back
-
-=cut
-
-sub getStage3Attrs
-{
-    my $class = shift;
-
-    $class->_init() if !%AttributeInfo;
-
-    return 
-        grep { 
-            $AttributeInfo{$_}->{applies_to_systems} 
-            || $AttributeInfo{$_}->{applies_to_client} 
-        }
-        keys %AttributeInfo
-}
-
-=item C<getSystemAttrs()>
-
-Returns the attribute names that apply to systems.
-
-=over
-
-=item Return Value
-
-An array of attribute names.
-
-=back
-
-=cut
-
-sub getSystemAttrs
-{
-    my $class = shift;
-
-    $class->_init() if !%AttributeInfo;
-
-    return 
-        grep { $AttributeInfo{$_}->{"applies_to_systems"} }
-        keys %AttributeInfo
-}
-
-=item C<getClientAttrs()>
-
-Returns the attribute names that apply to clients.
-
-=over
-
-=item Return Value
-
-An array of attribute names.
-
-=back
-
-=cut
-
-sub getClientAttrs
-{
-    my $class = shift;
-
-    $class->_init() if !%AttributeInfo;
-
-    return 
-        grep { $AttributeInfo{$_}->{"applies_to_clients"} }
-        keys %AttributeInfo
-}
-
-=item C<findProblematicValues()>
-
-Checks if the given stage3 attribute values are allowed (and make sense).
-
-This method returns an array-ref of problems found. If there were no problems, 
-this methods returns undef.
-
-=cut
-
-sub findProblematicValues
-{
-    my $class            = shift;
-    my $stage3Attrs      = shift || {};
-    my $vendorOSName     = shift;
-    my $installedPlugins = shift;
-
-    $class->_init() if !%AttributeInfo;
-
-    my @problems;
-
-    my %attrsByPlugin;
-    foreach my $key (sort keys %{$stage3Attrs}) {
-        my $value = $stage3Attrs->{$key};
-        if ($key =~ m{^(.+)::.+?$}) {
-            my $pluginName = $1;
-            if ($installedPlugins 
-            && !grep { $_->{plugin_name} eq $pluginName } @$installedPlugins) {
-                # avoid checking attributes of plugins that are not installed
-                next;
-            }
-            $attrsByPlugin{$pluginName} ||= {};
-            $attrsByPlugin{$pluginName}->{$key} = $value;
-        }
-
-        # undefined values are always allowed
-        next if !defined $value;
-
-        # check the value against the regex of the attribute (if any)
-        my $attrInfo = $AttributeInfo{$key};
-        if (!$attrInfo) {
-            push @problems, _tr('attribute "%s" is unknown!', $key);
-            next;
-        }
-        my $regex = $attrInfo->{content_regex};
-        if ($regex && $value !~ $regex) {
-            push @problems, _tr(
-                "the value '%s' for attribute %s is not allowed.\nAllowed values are: %s",
-                $value, $key, $attrInfo->{content_descr}
-            );
-        }
-    }
-
-    # if no vendorOS-name has been provided or there are no plugins installed, 
-    # we can't do any further checks
-    if ($vendorOSName && $installedPlugins) {
-        # now give each installed plugin a chance to check it's own attributes
-        # by itself
-        foreach my $pluginInfo (
-            sort { $a->{plugin_name} cmp $b->{plugin_name} } @$installedPlugins
-        ) {
-            my $pluginName = $pluginInfo->{plugin_name};
-            vlog 2, "checking attrs of plugin: $pluginName\n";
-            # create & start OSPlugin-engine for vendor-OS and current plugin
-            my $engine = OpenSLX::OSPlugin::Engine->new;
-            if (!$engine->initialize($pluginName, $vendorOSName)) {
-                warn _tr(
-                    'unable to create engine for plugin "%s"!', $pluginName
-                );
-                next;
-            }
-            $engine->checkStage3AttrValues(
-                $attrsByPlugin{$pluginName}, \@problems
-            );
-        }
-    }
-    
-    return if !@problems;
-    
-    return \@problems;
-}
-
-=item C<computeMD5HashOverAllAttrs()>
-
-Returns a MD5 hash representing the list of all attributes (including plugins).
-
-=cut
-
-sub computeMD5HashOverAllAttrs
-{
-    my $class = shift;
-
-    $class->_init() if !%AttributeInfo;
-
-    my %attrNames;
-    @attrNames{keys %AttributeInfo} = ();
-    
-    my $pluginInfo = OpenSLX::OSPlugin::Roster->getAvailablePlugins();
-    if ($pluginInfo) {
-        foreach my $pluginName (sort keys %$pluginInfo) {
-            my $attrInfo 
-                = OpenSLX::OSPlugin::Roster->getPluginAttrInfo($pluginName);
-            @attrNames{keys %$attrInfo} = ();
-        }
-    }
-    
-    my $attrNamesAsString = join ',', sort keys %attrNames;
-
-    return md5_hex($attrNamesAsString);
-}
-
-1;
diff --git a/config-db/OpenSLX/ConfigDB.pm b/config-db/OpenSLX/ConfigDB.pm
deleted file mode 100644
index 89011246..00000000
--- a/config-db/OpenSLX/ConfigDB.pm
+++ /dev/null
@@ -1,3190 +0,0 @@
-# Copyright (c) 2006, 2007 - OpenSLX GmbH
-#
-# This program is free software distributed under the GPL version 2.
-# See http://openslx.org/COPYING
-#
-# If you have any feedback please consult http://openslx.org/feedback and
-# send your suggestions, praise, or complaints to feedback@openslx.org
-#
-# General information about OpenSLX can be found at http://openslx.org/
-# -----------------------------------------------------------------------------
-package OpenSLX::ConfigDB;
-
-use strict;
-use warnings;
-
-our (@ISA, @EXPORT_OK, %EXPORT_TAGS, $VERSION);
-$VERSION = 1;    # API-version
-
-use Clone qw(clone);
-use File::Basename;
-
-use Exporter;
-@ISA = qw(Exporter);
-
-=pod
-
-=head1 NAME
-
-OpenSLX::ConfigDB - the configuration database API class for OpenSLX
-
-=head1 SYNOPSIS
-
-  use OpenSLX::ConfigDB;
-
-  openslxInit();
-
-  my $openslxDB = OpenSLX::ConfigDB->new();
-  $openslxDB->connect();
-
-  # fetch a client by name:
-  my $defaultClient = $openslxDB->fetchClientByFilter({'name' => '<<<default>>>'})
-
-  # fetch all systems:
-  my @systems = $openslxDB->fetchSystemByFilter();
-
-=head1 DESCRIPTION
-
-This class defines the OpenSLX API to the config database (the data layer to
-the outside world).
-
-The ConfigDB interface contains of five different parts:
-
-=over
-
-=item - L<basic methods> (connection handling)
-
-=item - L<data access methods> (getting data)
-
-=item - L<data manipulation methods> (adding, removing and changing data)
-
-=item - L<data aggregation methods> (getting info about the resulting
-configurations after mixing individual client-, group- and system-
-configurations).
-
-=item - L<suppport functions> (useful helpers)
-
-=back
-
-=head1 Special Concepts
-
-=over
-
-=item C<Filters>
-
-A filter is a hash-ref defining the filter criteria to be applied to a database
-query. Each key of the filter corresponds to a DB column and the (hash-)value
-contains the respective column value.
-
-[At a later stage, this will be improved to support a more structured approach
-to filtering (with boolean operators and hierarchical expressions)].
-
-=back
-
-=cut
-
-my @supportExports = qw(
-  mergeAttributes pushAttributes
-  externalIDForSystem externalIDForClient externalConfigNameForClient
-  generatePlaceholderFor
-);
-
-@EXPORT_OK   = (@supportExports);
-%EXPORT_TAGS = ('support' => [@supportExports],);
-
-use OpenSLX::AttributeRoster;
-use OpenSLX::Basics;
-use OpenSLX::DBSchema;
-use OpenSLX::OSPlugin::Roster;
-use OpenSLX::Utils;
-
-=head1 Methods
-
-=head2 Basic Methods
-
-=over
-
-=cut
-
-=item C<new()>
-
-Returns an object representing a database handle to the config database.
-
-=cut
-
-sub new
-{
-    my $class = shift;
-
-    my $self = {
-        'db-schema' => OpenSLX::DBSchema->new,
-    };
-
-    return bless $self, $class;
-}
-
-=item C<connect()>
-
-Tries to establish a connection to the database specified via the db-...
-settings.
-The global configuration hash C<%openslxConfig> contains further info about the
-requested connection. When implementing this method, you may have to look at
-the following entries in order to find out which database to connect to:
-
-=over
-
-=item C<$openslxConfig{'db-spec'}>
-
-Full specification of database, a special string defining the
-precise database to connect to (this allows connecting to a database
-that requires specifications which aren't cared for by the existing
-C<%config>-entries).
-
-=item C<$openslxConfig{'db-name'}>
-
-The precise name of the database that should be connected (defaults to 'openslx').
-
-=back
-
-=cut
-
-sub connect        ## no critic (ProhibitBuiltinHomonyms)
-{
-    my $self     = shift;
-    my $dbParams = shift;   # hash-ref with any additional info that might be 
-                            # required by specific metadb-module (not used yet)
-
-    my $dbType = $openslxConfig{'db-type'};
-        # name of underlying database module...
-
-    my $dbModuleName = "OpenSLX/MetaDB/$dbType.pm";
-    my $dbModule = "OpenSLX::MetaDB::$dbType";
-    unless (eval { require $dbModuleName } ) {
-        if ($! == 2) {
-            die _tr(
-                "Unable to load DB-module <%s>\nthat database type is not supported (yet?)\n",
-                $dbModuleName
-            );
-        } else {
-            die _tr("Unable to load DB-module <%s> (%s)\n", $dbModuleName, $@);
-        }
-    }
-    my $metaDB = $dbModule->new();
-    if (!$metaDB->connect($dbParams)) {
-        warn _tr("Unable to connect to DB-module <%s>\n%s", $dbModuleName, $@);
-        warn _tr("These DB-modules seem to work ok:");
-        foreach my $dbMod ('mysql', 'SQLite') {
-            my $fullDbModName = "DBD/$dbMod.pm";
-            if (eval { require $fullDbModName }) {
-                vlog(0, "\t$dbMod\n");
-            }
-        }
-        die _tr(
-            'Please use slxsettings if you want to switch to another db-type.'
-        );
-    }
-
-    $self->{'db-type'} = $dbType;
-    $self->{'meta-db'} = $metaDB;
-
-    $self->{'db-schema'}->checkAndUpgradeDBSchemaIfNecessary($self)
-        or die _tr('unable to check/update DB schema!');
-    
-    # check if any attributes or plugins have been added/removed since 
-    # last DB-session and bring the DB up-to-date, if so
-    my $pluginInfoHashVal 
-        = OpenSLX::AttributeRoster->computeMD5HashOverAllAttrs();
-    my $pluginInfoHashValInDB = $metaDB->schemaFetchPluginInfoHashVal() || '';
-    vlog(1, "plugin-info-hashes: $pluginInfoHashVal <=> $pluginInfoHashValInDB");
-    if ($pluginInfoHashValInDB ne $pluginInfoHashVal) {
-        $self->cleanupAnyInconsistencies();
-        return if !$metaDB->schemaSetPluginInfoHashVal($pluginInfoHashVal);
-    }
-    
-    return 1;
-}
-
-=item C<disconnect()>
-
-Tears down the connection to the database and cleans up.
-
-=cut
-
-sub disconnect
-{
-    my $self = shift;
-
-    $self->{'meta-db'}->disconnect();
-
-    return 1;
-}
-
-=item C<startTransaction()>
-
-Opens a database transaction - most useful if you want to make sure a couple of 
-changes apply as a whole or not at all.
-
-=cut
-
-sub startTransaction
-{
-    my $self = shift;
-
-    $self->{'meta-db'}->startTransaction();
-
-    return 1;
-}
-
-=item C<commitTransaction()>
-
-Commits a database transaction - so all changes done inside of this transaction 
-will be applied to the database.
-
-=cut
-
-sub commitTransaction
-{
-    my $self = shift;
-
-    $self->{'meta-db'}->commitTransaction();
-
-    return 1;
-}
-
-=item C<rollbackTransaction()>
-
-Revokes a database transaction - so all changes done inside of this transaction 
-will be undone.
-
-=cut
-
-sub rollbackTransaction
-{
-    my $self = shift;
-
-    $self->{'meta-db'}->rollbackTransaction();
-
-    return 1;
-}
-
-=item C<cleanupAnyInconsistencies()>
-
-Looks for any inconsistencies (stale references, references to non-existing
-plugins, ...) and removes them from the DB.
-
-=cut
-
-sub cleanupAnyInconsistencies
-{
-    my $self = shift;
-
-    $self->synchronizeAttributesWithDB();
-
-    return if !$self->_removeStaleSystemAttributes();
-    return if !$self->_removeStaleGroupAttributes();
-    return if !$self->_removeStaleClientAttributes();
-    return if !$self->_removeStaleVendorOSAttributes();
-
-    return 1;
-}
-
-=item C<synchronizeAttributesWithDB()>
-
-Makes sure that all known attributes are referenced by the default system
-(and no unknown ones).
-
-Additionally, all systems, groups and clients can be checked and get their
-stale attributes removed, too.
-
-=cut
-
-sub synchronizeAttributesWithDB
-{
-    my $self = shift;
-
-    my $defaultSystem = $self->fetchSystemByID(0);
-    return if !$defaultSystem;
-
-    # fetch all known attributes from attribute roster and merge these 
-    # into the existing attributes of the default system and client
-    my $attrInfo = OpenSLX::AttributeRoster->getAttrInfo();
-
-    # add new system attributes to default system
-    my @newSystemAttrs
-        =   grep { 
-                $attrInfo->{$_}->{applies_to_systems}
-                && !exists $defaultSystem->{attrs}->{$_} 
-            } keys %{$attrInfo};
-    foreach my $attr (@newSystemAttrs) {
-        $defaultSystem->{attrs}->{$attr} = $attrInfo->{$attr}->{default};
-    }
-    
-    # remove unknown system attributes from default system
-    my @unknownSystemAttrs
-        =   grep { 
-                !exists $attrInfo->{$_}
-                || !$attrInfo->{$_}->{applies_to_systems}
-            } keys %{$defaultSystem->{attrs}};
-    foreach my $unknownAttr (@unknownSystemAttrs) {
-        delete $defaultSystem->{attrs}->{$unknownAttr};
-    }
-    
-    # now write back the updated default system if necessary
-    if (@newSystemAttrs || @unknownSystemAttrs) {
-        return if !$self->changeSystem(0, $defaultSystem);
-    }
-    
-    my $defaultClient = $self->fetchClientByID(0);
-    return if !$defaultClient;
-
-    # add new client attributes to default client (deal only with
-    # attributes that are client-only)
-    my @newClientAttrs
-        =   grep { 
-                $attrInfo->{$_}->{applies_to_clients}
-                && !$attrInfo->{$_}->{applies_to_systems}
-                && !exists $defaultClient->{attrs}->{$_} 
-            } keys %{$attrInfo};
-    foreach my $attr (@newClientAttrs) {
-        $defaultClient->{attrs}->{$attr} = $attrInfo->{$attr}->{default};
-    }
-    
-    # remove unknown client attributes from default client (deal only with
-    # attributes that are client-only)
-    my @unknownClientAttrs
-        =   grep { 
-                !exists $attrInfo->{$_}
-                || !$attrInfo->{$_}->{applies_to_clients}
-                || $attrInfo->{$_}->{applies_to_systems}
-            } keys %{$defaultClient->{attrs}};
-    foreach my $unknownAttr (@unknownClientAttrs) {
-        delete $defaultClient->{attrs}->{$unknownAttr};
-    }
-    
-    # now write back the updated default client if necessary
-    if (@newClientAttrs || @unknownClientAttrs) {
-        return if !$self->changeClient(0, $defaultClient);
-    }
-    
-    return 1;
-}
-
-=item C<_removeStaleSystemAttributes()>
-
-Removes any stale attributes from every system.
-
-=cut
-
-sub _removeStaleSystemAttributes
-{
-    my $self = shift;
-
-    my $attrInfo = OpenSLX::AttributeRoster->getAttrInfo();
-
-    my @systems = $self->fetchSystemByFilter();
-    foreach my $system (@systems) {
-        my @unknownAttrs 
-            = grep { !exists $attrInfo->{$_} } keys %{$system->{attrs}};
-        if (@unknownAttrs) {
-            foreach my $unknownAttr (@unknownAttrs) {
-                delete $system->{attrs}->{$unknownAttr};
-            }
-            return if !$self->changeSystem($system->{id}, $system);
-        }
-    }
-
-    return 1;
-}
-
-=item C<_removeStaleGroupAttributes()>
-
-Removes any stale attributes from every group.
-
-=cut
-
-sub _removeStaleGroupAttributes
-{
-    my $self = shift;
-
-    my $attrInfo = OpenSLX::AttributeRoster->getAttrInfo();
-
-    my @groups = $self->fetchGroupByFilter();
-    foreach my $group (@groups) {
-        my @unknownAttrs 
-            = grep { !exists $attrInfo->{$_} } keys %{$group->{attrs}};
-        if (@unknownAttrs) {
-            foreach my $unknownAttr (@unknownAttrs) {
-                delete $group->{attrs}->{$unknownAttr};
-            }
-            return if !$self->changeGroup($group->{id}, $group);
-        }
-    }
-
-    return 1;
-}
-
-=item C<_removeStaleClientAttributes()>
-
-Removes any stale attributes from every client.
-
-=cut
-
-sub _removeStaleClientAttributes
-{
-    my $self = shift;
-
-    my $attrInfo = OpenSLX::AttributeRoster->getAttrInfo();
-
-    my @clients = $self->fetchClientByFilter();
-    foreach my $client (@clients) {
-        my @unknownAttrs 
-            = grep { !exists $attrInfo->{$_} } keys %{$client->{attrs}};
-        if (@unknownAttrs) {
-            foreach my $unknownAttr (@unknownAttrs) {
-                delete $client->{attrs}->{$unknownAttr};
-            }
-            return if !$self->changeClient($client->{id}, $client);
-        }
-    }
-
-    return 1;
-}
-
-=item C<_removeStaleVendorOSAttributes()>
-
-Removes any stale attributes from every vendor-OS.
-
-=cut
-
-sub _removeStaleVendorOSAttributes
-{
-    my $self = shift;
-
-    my @vendorOSes = $self->fetchVendorOSByFilter();
-    foreach my $vendorOS (@vendorOSes) {
-        my @installedPlugins = $self->fetchInstalledPlugins($vendorOS->{id});
-        foreach my $plugin (@installedPlugins) {
-            my $pluginName = $plugin->{plugin_name};
-            my $attrInfo 
-                = OpenSLX::OSPlugin::Roster->getPluginAttrInfo($pluginName);
-            if ($attrInfo) {
-                my @unknownAttrs 
-                    = grep { !exists $attrInfo->{$_} } keys %{$plugin->{attrs}};
-                if (@unknownAttrs) {
-                    foreach my $unknownAttr (@unknownAttrs) {
-                        delete $plugin->{attrs}->{$unknownAttr};
-                    }
-                    return if !$self->addInstalledPlugin(
-                        $vendorOS->{id}, $pluginName, $plugin->{attrs}
-                    );
-                }
-            }
-            else {
-                $self->removeInstalledPlugin($vendorOS->{id}, $pluginName);
-            }
-        }
-    }
-
-    return 1;
-}
-
-=back
-
-=head2 Data Access Methods
-
-=over
-
-=cut
-
-=item C<getColumnsOfTable($tableName)>
-
-Returns the names of the columns of the given table.
-
-=over
-
-=item Param C<tableName>
-
-The name of the DB-table whose columns you'd like to retrieve.
-
-=item Return Value
-
-An array of column names.
-
-=back
-
-=cut
-
-sub getColumnsOfTable
-{
-    my $self      = shift;
-    my $tableName = shift;
-
-    return $self->{'db-schema'}->getColumnsOfTable($tableName);
-}
-
-=item C<fetchVendorOSByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all vendor-OSes that match the given
-filter.
-
-=over
-
-=item Param C<filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchVendorOSByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-
-    my @vendorOS 
-        = $self->{'meta-db'}->fetchVendorOSByFilter($filter, $resultCols);
-
-    return wantarray() ? @vendorOS : shift @vendorOS;
-}
-
-=item C<fetchVendorOSByID(@$ids, [$resultCols])>
-
-Fetches and returns information the vendor-OSes with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the vendor-OS-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchVendorOSByID
-{
-    my $self       = shift;
-    my $ids        = _aref(shift);
-    my $resultCols = shift;
-
-    my @vendorOS = $self->{'meta-db'}->fetchVendorOSByID($ids, $resultCols);
-
-    return wantarray() ? @vendorOS : shift @vendorOS;
-}
-
-=item C<fetchInstalledPlugins($vendorOSID)>
-
-Returns the names of all plugins that have been installed into the given
-vendor-OS.
-
-=over
-
-=item Param C<vendorOSID>
-
-The id of the vendor-OS whose plugins you are interested in
-
-=item Param C<pluginName> [Optional]
-
-The name of a specific plugin you are interested in
-
-=item Return Value
-
-An array with the plugin names.
-
-=back
-
-=cut
-
-sub fetchInstalledPlugins
-{
-    my $self       = shift;
-    my $vendorOSID = shift;
-    my $pluginName = shift;
-
-    $self->{'meta-db'}->fetchInstalledPlugins($vendorOSID, $pluginName);
-}
-
-=item C<fetchExportByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all exports that match the given
-filter.
-
-=over
-
-=item Param C<filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchExportByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-
-    my @exports = $self->{'meta-db'}->fetchExportByFilter($filter, $resultCols);
-
-    return wantarray() ? @exports : shift @exports;
-}
-
-=item C<fetchExportByID(@$ids, [$resultCols])>
-
-Fetches and returns information the exports with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the export-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchExportByID
-{
-    my $self       = shift;
-    my $ids        = _aref(shift);
-    my $resultCols = shift;
-
-    my @exports = $self->{'meta-db'}->fetchExportByID($ids, $resultCols);
-
-    return wantarray() ? @exports : shift @exports;
-}
-
-=item C<fetchExportIDsOfVendorOS($id)>
-
-Fetches the IDs of all exports that make use of the vendor-OS with the given ID.
-
-=over
-
-=item Param C<id>
-
-ID of the vendor-OS whose exports shall be returned.
-
-=item Return Value
-
-An array of system-IDs.
-
-=back
-
-=cut
-
-sub fetchExportIDsOfVendorOS
-{
-    my $self       = shift;
-    my $vendorOSID = shift;
-
-    return $self->{'meta-db'}->fetchExportIDsOfVendorOS($vendorOSID);
-}
-
-=item C<fetchGlobalInfo($id)>
-
-Fetches the global info element specified by the given ID.
-
-=over
-
-=item Param C<id>
-
-The name of the global info value you are interested in.
-
-=item Return Value
-
-The value of the requested global info.
-
-=back
-
-=cut
-
-sub fetchGlobalInfo
-{
-    my $self = shift;
-    my $id   = shift;
-
-    return $self->{'meta-db'}->fetchGlobalInfo($id);
-}
-
-=item C<fetchSystemByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all systems that match the given filter.
-
-=over
-
-=item Param C<$filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<$resultCols> [Optional]
-
-A comma-separated list of colunm names that shall be returned. If not defined,
-all available data must be returned.
-
-=item Param C<$attrFilter> [Optional]
-
-A hash-ref containing the filter criteria that shall be applied against
-attributes.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchSystemByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-    my $attrFilter = shift;
-
-    my @systems = $self->{'meta-db'}->fetchSystemByFilter(
-        $filter, $resultCols, $attrFilter
-    );
-
-    # unless specific result cols have been given, we mix in the attributes
-    # of each system, too:
-    if (!defined $resultCols) {
-        foreach my $system (@systems) {
-            $system->{attrs} 
-                = $self->{'meta-db'}->fetchSystemAttrs($system->{id});
-        }
-    }
-
-    return wantarray() ? @systems : shift @systems;
-}
-
-=item C<fetchSystemByID(@$ids, [$resultCols])>
-
-Fetches and returns information the systems with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the system-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchSystemByID
-{
-    my $self       = shift;
-    my $ids        = _aref(shift);
-    my $resultCols = shift;
-
-    my @systems = $self->{'meta-db'}->fetchSystemByID($ids, $resultCols);
-    
-    # unless specific result cols have been given, we mix in the attributes
-    # of each system, too:
-    if (!defined $resultCols) {
-        foreach my $system (@systems) {
-            $system->{attrs} 
-                = $self->{'meta-db'}->fetchSystemAttrs($system->{id});
-        }
-    }
-
-    return wantarray() ? @systems : shift @systems;
-}
-
-=item C<fetchSystemIDsOfExport($id)>
-
-Fetches the IDs of all systems that make use of the export with the given ID.
-
-=over
-
-=item Param C<id>
-
-ID of the export whose systems shall be returned.
-
-=item Return Value
-
-An array of system-IDs.
-
-=back
-
-=cut
-
-sub fetchSystemIDsOfExport
-{
-    my $self     = shift;
-    my $exportID = shift;
-
-    return $self->{'meta-db'}->fetchSystemIDsOfExport($exportID);
-}
-
-=item C<fetchSystemIDsOfClient($id)>
-
-Fetches the IDs of all systems that are used by the client with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the client whose systems shall be returned.
-
-=item Return Value
-
-An array of system-IDs.
-
-=back
-
-=cut
-
-sub fetchSystemIDsOfClient
-{
-    my $self     = shift;
-    my $clientID = shift;
-
-    return $self->{'meta-db'}->fetchSystemIDsOfClient($clientID);
-}
-
-=item C<fetchSystemIDsOfGroup($id)>
-
-Fetches the IDs of all systems that are part of the group with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the group whose systems shall be returned.
-
-=item Return Value
-
-An array of system-IDs.
-
-=back
-
-=cut
-
-sub fetchSystemIDsOfGroup
-{
-    my $self    = shift;
-    my $groupID = shift;
-
-    return $self->{'meta-db'}->fetchSystemIDsOfGroup($groupID);
-}
-
-=item C<fetchClientByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all clients that match the given filter.
-
-=over
-
-=item Param C<$filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<$resultCols> [Optional]
-
-A comma-separated list of colunm names that shall be returned. If not defined,
-all available data must be returned.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchClientByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-    my $attrFilter = shift;
-
-    my @clients = $self->{'meta-db'}->fetchClientByFilter(
-        $filter, $resultCols, $attrFilter
-    );
-
-    # unless specific result cols have been given, we mix in the attributes
-    # of each client, too:
-    if (!defined $resultCols) {
-        foreach my $client (@clients) {
-            $client->{attrs} 
-                = $self->{'meta-db'}->fetchClientAttrs($client->{id});
-        }
-    }
-
-    return wantarray() ? @clients : shift @clients;
-}
-
-=item C<fetchClientByID(@$ids, [$resultCols])>
-
-Fetches and returns information the clients with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the client-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchClientByID
-{
-    my $self       = shift;
-    my $ids        = _aref(shift);
-    my $resultCols = shift;
-
-    my @clients = $self->{'meta-db'}->fetchClientByID($ids, $resultCols);
-
-    # unless specific result cols have been given, we mix in the attributes
-    # of each client, too:
-    if (!defined $resultCols) {
-        foreach my $client (@clients) {
-            $client->{attrs} 
-                = $self->{'meta-db'}->fetchClientAttrs($client->{id});
-        }
-    }
-
-    return wantarray() ? @clients : shift @clients;
-}
-
-=item C<fetchClientIDsOfSystem($id)>
-
-Fetches the IDs of all clients that make use of the system with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the system whose clients shall be returned.
-
-=item Return Value
-
-An array of client-IDs.
-
-=back
-
-=cut
-
-sub fetchClientIDsOfSystem
-{
-    my $self     = shift;
-    my $systemID = shift;
-
-    return $self->{'meta-db'}->fetchClientIDsOfSystem($systemID);
-}
-
-=item C<fetchClientIDsOfGroup($id)>
-
-Fetches the IDs of all clients that are part of the group with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the group whose clients shall be returned.
-
-=item Return Value
-
-An array of client-IDs.
-
-=back
-
-=cut
-
-sub fetchClientIDsOfGroup
-{
-    my $self    = shift;
-    my $groupID = shift;
-
-    return $self->{'meta-db'}->fetchClientIDsOfGroup($groupID);
-}
-
-=item C<fetchGroupByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all groups that match the given filter.
-
-=over
-
-=item Param C<$filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<$resultCols> [Optional]
-
-A comma-separated list of colunm names that shall be returned. If not defined,
-all available data must be returned.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchGroupByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-    my $attrFilter = shift;
-
-    my @groups = $self->{'meta-db'}->fetchGroupByFilter(
-        $filter, $resultCols, $attrFilter
-    );
-
-    # unless specific result cols have been given, we mix in the attributes
-    # of each group, too:
-    if (!defined $resultCols) {
-        foreach my $group (@groups) {
-            $group->{attrs} 
-                = $self->{'meta-db'}->fetchGroupAttrs($group->{id});
-        }
-    }
-
-    return wantarray() ? @groups : shift @groups;
-}
-
-=item C<fetchGroupByID(@$ids, [$resultCols])>
-
-Fetches and returns information the groups with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the group-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=cut
-
-sub fetchGroupByID
-{
-    my $self       = shift;
-    my $ids        = _aref(shift);
-    my $resultCols = shift;
-
-    my @groups = $self->{'meta-db'}->fetchGroupByID($ids, $resultCols);
-
-    # unless specific result cols have been given, we mix in the attributes
-    # of each group, too:
-    if (!defined $resultCols) {
-        foreach my $group (@groups) {
-            $group->{attrs} 
-                = $self->{'meta-db'}->fetchGroupAttrs($group->{id});
-        }
-    }
-
-    return wantarray() ? @groups : shift @groups;
-}
-
-=item C<fetchGroupIDsOfSystem($id)>
-
-Fetches the IDs of all groups that contain the system with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the system whose groups shall be returned.
-
-=item Return Value
-
-An array of client-IDs.
-
-=back
-
-=cut
-
-sub fetchGroupIDsOfSystem
-{
-    my $self     = shift;
-    my $systemID = shift;
-
-    return $self->{'meta-db'}->fetchGroupIDsOfSystem($systemID);
-}
-
-=item C<fetchGroupIDsOfClient($id)>
-
-Fetches the IDs of all groups that contain the client with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the client whose groups shall be returned.
-
-=item Return Value
-
-An array of client-IDs.
-
-=back
-
-=cut
-
-sub fetchGroupIDsOfClient
-{
-    my $self     = shift;
-    my $clientID = shift;
-
-    return $self->{'meta-db'}->fetchGroupIDsOfClient($clientID);
-}
-
-=back
-
-=head2 Data Manipulation Methods
-
-=over
-
-=item C<addVendorOS(@$valRows)>
-
-Adds one or more vendor-OS to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new vendor-OS(es).
-
-=item Return Value
-
-The IDs of the new vendor-OS(es), C<undef> if the creation failed.
-
-=back
-
-=cut
-
-sub addVendorOS
-{
-    my $self    = shift;
-    my $valRows = _aref(shift);
-
-    _checkCols($valRows, 'vendor_os', 'name');
-
-    my @IDs = $self->{'meta-db'}->addVendorOS($valRows);
-    return wantarray() ? @IDs : $IDs[0];
-}
-
-=item C<removeVendorOS(@$vendorOSIDs)>
-
-Removes one or more vendor-OS from the database.
-
-=over
-
-=item Param C<vendorOSIDs>
-
-An array-ref containing the IDs of the vendor-OSes that shall be removed.
-
-=item Return Value
-
-C<1> if the vendorOS(es) could be removed, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeVendorOS
-{
-    my $self        = shift;
-    my $vendorOSIDs = _aref(shift);
-
-    # drop all installed plugins before removing the vendor-OS
-    foreach my $vendorOSID (@$vendorOSIDs) {
-        my @installedPlugins 
-            = $self->{'meta-db'}->fetchInstalledPlugins($vendorOSID);
-        foreach my $plugin (@installedPlugins) {
-            my $pluginName = $plugin->{plugin_name};
-            $self->{'meta-db'}->removeInstalledPlugin($vendorOSID, $pluginName);
-        }
-    }
-    return $self->{'meta-db'}->removeVendorOS($vendorOSIDs);
-}
-
-=item C<changeVendorOS(@$vendorOSIDs, @$valRows)>
-
-Changes the data of one or more vendor-OS.
-
-=over
-
-=item Param C<vendorOSIDs>
-
-An array-ref containing the IDs of the vendor-OSes that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the vendor-OS(es).
-
-=item Return Value
-
-C<1> if the vendorOS(es) could be changed, C<undef> if not.
-
-=back
-
-=cut
-
-sub changeVendorOS
-{
-    my $self        = shift;
-    my $vendorOSIDs = _aref(shift);
-    my $valRows     = _aref(shift);
-
-    return $self->{'meta-db'}->changeVendorOS($vendorOSIDs, $valRows);
-}
-
-=item C<addInstalledPlugin($vendorOSID, $pluginName)>
-
-Adds a freshly installed plugin to a vendor-OS.
-
-=over
-
-=item Param C<vendorOSID>
-
-The id of the vendor-OS the given plugin has been installed into
-
-=item Param C<pluginName>
-
-The name of the plugin that has been installed
-
-=item Return Value
-
-The ID of the new reference entry, C<undef> if the creation failed.
-
-=back
-
-=cut
-
-sub addInstalledPlugin
-{
-    my $self        = shift;
-    my $vendorOSID  = shift;
-    my $pluginName  = shift;
-    my $pluginAttrs = shift || {};
-
-    return $self->{'meta-db'}->addInstalledPlugin(
-        $vendorOSID, $pluginName, $pluginAttrs
-    );
-}
-
-=item C<removeInstalledPlugin($vendorOSID, $pluginName)>
-
-Removes a uninstalled plugin for a vendor-OS.
-
-=over
-
-=item Param C<vendorOSID>
-
-The id of the vendor-OS the given plugin has been uninstalled from
-
-=item Param C<pluginName>
-
-The name of the plugin that has been uninstalled
-
-=item Return Value
-
-1 if it worked, C<undef> if it didn't.
-
-=back
-
-=cut
-
-sub removeInstalledPlugin
-{
-    my $self       = shift;
-    my $vendorOSID = shift;
-    my $pluginName = shift;
-
-    return $self->{'meta-db'}->removeInstalledPlugin($vendorOSID, $pluginName);
-}
-
-=item C<addExport(@$valRows)>
-
-Adds one or more export to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new export(s).
-
-=item Return Value
-
-The IDs of the new export(s), C<undef> if the creation failed.
-
-=back
-
-=cut
-
-sub addExport
-{
-    my $self    = shift;
-    my $valRows = _aref(shift);
-
-    _checkCols($valRows, 'export', qw(name vendor_os_id type));
-
-    my @IDs = $self->{'meta-db'}->addExport($valRows);
-    return wantarray() ? @IDs : $IDs[0];
-}
-
-=item C<removeExport(@$exportIDs)>
-
-Removes one or more export from the database.
-
-=over
-
-=item Param C<exportIDs>
-
-An array-ref containing the IDs of the exports that shall be removed.
-
-=item Return Value
-
-C<1> if the export(s) could be removed, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeExport
-{
-    my $self      = shift;
-    my $exportIDs = _aref(shift);
-
-    return $self->{'meta-db'}->removeExport($exportIDs);
-}
-
-=item C<changeExport(@$exportIDs, @$valRows)>
-
-Changes the data of one or more export.
-
-=over
-
-=item Param C<vendorOSIDs>
-
-An array-ref containing the IDs of the exports that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the export(s).
-
-=item Return Value
-
-C<1> if the export(s) could be changed, C<undef> if not.
-
-=back
-
-=cut
-
-sub changeExport
-{
-    my $self      = shift;
-    my $exportIDs = _aref(shift);
-    my $valRows   = _aref(shift);
-
-    return $self->{'meta-db'}->changeExport($exportIDs, $valRows);
-}
-
-=item C<incrementGlobalCounter($counterName)>
-
-Increments the global counter of the given name and returns the *old* value.
-
-=over
-
-=item Param C<counterName>
-
-The name of the global counter that shall be bumped.
-
-=item Return Value
-
-The value the global counter had before it was incremented.
-
-=back
-
-=cut
-
-sub incrementGlobalCounter
-{
-    my $self        = shift;
-    my $counterName = shift;
-
-    $self->startTransaction();
-    my $value = $self->fetchGlobalInfo($counterName);
-    return unless defined $value;
-    my $newValue = $value + 1;
-    $self->changeGlobalInfo($counterName, $newValue);
-    $self->commitTransaction();
-
-    return $value;
-}
-
-=item C<changeGlobalInfo($id, $value)>
-
-Sets the global info element specified by the given ID to the given value.
-
-=over
-
-=item Param C<id>
-
-The ID specifying the global info you'd like to change.
-
-=item Param C<value>
-
-The new value for the global info element.
-
-=item Return Value
-
-The value the global counter had before it was incremented.
-
-=back
-
-=cut
-
-sub changeGlobalInfo
-{
-    my $self  = shift;
-    my $id    = shift;
-    my $value = shift;
-
-    return if !defined $self->{'meta-db'}->fetchGlobalInfo($id);
-
-    return $self->{'meta-db'}->changeGlobalInfo($id, $value);
-}
-
-=item C<addSystem(@$valRows)>
-
-Adds one or more systems to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new system(s).
-
-=item Return Value
-
-The IDs of the new system(s), C<undef> if the creation failed.
-
-=back
-
-=cut
-
-sub addSystem
-{
-    my $self      = shift;
-    my $inValRows = _aref(shift);
-
-    _checkCols($inValRows, 'system', qw(name export_id));
-
-    my ($valRows, $attrValRows) = _cloneAndUnhingeAttrs($inValRows);
-
-    foreach my $valRow (@$valRows) {
-        if (!$valRow->{kernel}) {
-            $valRow->{kernel} = 'vmlinuz';
-            vlog(
-                1,
-                _tr(
-                    "setting kernel of system '%s' to 'vmlinuz'!",
-                    $valRow->{name}
-                )
-            );
-        }
-        if (!$valRow->{label}) {
-            $valRow->{label} = $valRow->{name};
-        }
-    }
-
-    my @IDs = $self->{'meta-db'}->addSystem($valRows, $attrValRows);
-    return wantarray() ? @IDs : $IDs[0];
-}
-
-=item C<removeSystem(@$systemIDs)>
-
-Removes one or more systems from the database.
-
-=over
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be removed.
-
-=item Return Value
-
-C<1> if the system(s) could be removed, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeSystem
-{
-    my $self      = shift;
-    my $systemIDs = _aref(shift);
-
-    foreach my $system (@$systemIDs) {
-        $self->setGroupIDsOfSystem($system);
-        $self->setClientIDsOfSystem($system);
-    }
-
-    return $self->{'meta-db'}->removeSystem($systemIDs);
-}
-
-=item C<changeSystem(@$systemIDs, @$valRows)>
-
-Changes the data of one or more systems.
-
-=over
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the system(s).
-
-=item Return Value
-
-C<1> if the system(s) could be changed, C<undef> if not.
-
-=back
-
-=cut
-
-sub changeSystem
-{
-    my $self      = shift;
-    my $systemIDs = _aref(shift);
-    my $inValRows = _aref(shift);
-
-    my ($valRows, $attrValRows) = _cloneAndUnhingeAttrs($inValRows);
-
-    return $self->{'meta-db'}->changeSystem($systemIDs, $valRows, $attrValRows);
-}
-
-#=item C<setSystemAttr($systemID, $attrName, $attrValue)>
-#
-#Sets a value for an attribute of the given system. If the system already
-#has a value for this attribute, it will be overwritten.
-#
-#=over
-#
-#=item Param C<systemID>
-#
-#The ID of the system whose attribute shall be changed.
-#
-#=item Param C<attrName>
-#
-#The name of the attribute to change.
-#
-#=item Param C<attrValue>
-#
-#The new value for the attribute.
-#
-#=item Return Value
-#
-#C<1> if the attribute could be set, C<undef> if not.
-#
-#=back
-#
-#=cut
-#
-#sub setSystemAttr
-#{
-#    my $self      = shift;
-#    my $systemID  = shift;
-#    my $attrName  = shift;
-#    my $attrValue = shift;
-#
-#    return $self->{'meta-db'}->setSystemAttr($systemID, $attrName, $attrValue);
-#}
-
-=item C<setClientIDsOfSystem($systemID, @$clientIDs)>
-
-Specifies all clients that should offer the given system for booting.
-
-=over
-
-=item Param C<systemID>
-
-The ID of the system whose clients you'd like to specify.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be connected to the
-system.
-
-=item Return Value
-
-C<1> if the system/client references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub setClientIDsOfSystem
-{
-    my $self      = shift;
-    my $systemID  = shift;
-    my $clientIDs = _aref(shift);
-
-    # associating a client to the default system makes no sense
-    return 0 if $systemID == 0;
-
-    my @uniqueClientIDs = _unique(@$clientIDs);
-
-    return $self->{'meta-db'}->setClientIDsOfSystem(
-        $systemID, \@uniqueClientIDs
-    );
-}
-
-=item C<addClientIDsToSystem($systemID, @$clientIDs)>
-
-Add one or more clients to the set that should offer the given system for booting.
-
-=over
-
-=item Param C<systemID>
-
-The ID of the system that you wish to add the clients to.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the new clients that shall be added to the
-system.
-
-=item Return Value
-
-C<1> if the system/client references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub addClientIDsToSystem
-{
-    my $self         = shift;
-    my $systemID     = shift;
-    my $newClientIDs = _aref(shift);
-
-    my @clientIDs = $self->{'meta-db'}->fetchClientIDsOfSystem($systemID);
-    push @clientIDs, @$newClientIDs;
-
-    return $self->setClientIDsOfSystem($systemID, \@clientIDs);
-}
-
-=item C<removeClientIDsFromSystem($systemID, @$clientIDs)>
-
-Removes the connection between the given clients and the given system.
-
-=over
-
-=item Param C<systemID>
-
-The ID of the system you'd like to remove groups from.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be removed from the
-system.
-
-=item Return Value
-
-C<1> if the system/client references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeClientIDsFromSystem
-{
-    my $self             = shift;
-    my $systemID         = shift;
-    my $removedClientIDs = _aref(shift);
-
-    my %toBeRemoved;
-    @toBeRemoved{@$removedClientIDs} = ();
-    my @clientIDs =
-      grep { !exists $toBeRemoved{$_} }
-      $self->{'meta-db'}->fetchClientIDsOfSystem($systemID);
-
-    return $self->setClientIDsOfSystem($systemID, \@clientIDs);
-}
-
-=item C<setGroupIDsOfSystem($systemID, @$groupIDs)>
-
-Specifies all groups that should offer the given system for booting.
-
-=over
-
-=item Param C<systemID>
-
-The ID of the system whose groups you'd like to specify.
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that shall be connected to the
-system.
-
-=item Return Value
-
-C<1> if the system/group references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub setGroupIDsOfSystem
-{
-    my $self     = shift;
-    my $systemID = shift;
-    my $groupIDs = _aref(shift);
-
-    # associating a group to the default system makes no sense
-    return 0 if $systemID == 0;
-
-    my @uniqueGroupIDs = _unique(@$groupIDs);
-
-    return $self->{'meta-db'}->setGroupIDsOfSystem($systemID, \@uniqueGroupIDs);
-}
-
-=item C<addGroupIDsToSystem($systemID, @$groupIDs)>
-
-Add one or more groups to the set that should offer the given system for booting.
-
-=over
-
-=item Param C<systemID>
-
-The ID of the system that you wish to add the groups to.
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the new groups that shall be added to the
-system.
-
-=item Return Value
-
-C<1> if the system/group references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub addGroupIDsToSystem
-{
-    my $self        = shift;
-    my $systemID    = shift;
-    my $newGroupIDs = _aref(shift);
-
-    my @groupIDs = $self->{'meta-db'}->fetchGroupIDsOfSystem($systemID);
-    push @groupIDs, @$newGroupIDs;
-
-    return $self->setGroupIDsOfSystem($systemID, \@groupIDs);
-}
-
-=item C<removeGroupIDsFromSystem($systemID, @$groupIDs)>
-
-Removes the connection between the given groups and the given system.
-
-=over
-
-=item Param C<systemID>
-
-The ID of the system you'd like to remove groups from.
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that shall be removed from the
-system.
-
-=item Return Value
-
-C<1> if the system/group references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeGroupIDsFromSystem
-{
-    my $self                = shift;
-    my $systemID            = shift;
-    my $toBeRemovedGroupIDs = _aref(shift);
-
-    my %toBeRemoved;
-    @toBeRemoved{@$toBeRemovedGroupIDs} = ();
-    my @groupIDs =
-      grep { !exists $toBeRemoved{$_} }
-      $self->{'meta-db'}->fetchGroupIDsOfSystem($systemID);
-
-    return $self->setGroupIDsOfSystem($systemID, \@groupIDs);
-}
-
-=item C<addClient(@$valRows)>
-
-Adds one or more clients to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new client(s).
-
-=item Return Value
-
-The IDs of the new client(s), C<undef> if the creation failed.
-
-=back
-
-=cut
-
-sub addClient
-{
-    my $self      = shift;
-    my $inValRows = _aref(shift);
-
-    _checkCols($inValRows, 'client', qw(name mac));
-
-    my ($valRows, $attrValRows) = _cloneAndUnhingeAttrs($inValRows);
-
-    my @IDs = $self->{'meta-db'}->addClient($valRows, $attrValRows);
-    return wantarray() ? @IDs : $IDs[0];
-}
-
-=item C<removeClient(@$clientIDs)>
-
-Removes one or more clients from the database.
-
-=over
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be removed.
-
-=item Return Value
-
-C<1> if the client(s) could be removed, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeClient
-{
-    my $self      = shift;
-    my $clientIDs = _aref(shift);
-
-    foreach my $client (@$clientIDs) {
-        $self->setGroupIDsOfClient($client);
-        $self->setSystemIDsOfClient($client);
-    }
-
-    return $self->{'meta-db'}->removeClient($clientIDs);
-}
-
-=item C<changeClient(@$clientIDs, @$valRows)>
-
-Changes the data of one or more clients.
-
-=over
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the client(s).
-
-=item Return Value
-
-C<1> if the client(s) could be changed, C<undef> if not.
-
-=back
-
-=cut
-
-sub changeClient
-{
-    my $self      = shift;
-    my $clientIDs = _aref(shift);
-    my $inValRows = _aref(shift);
-
-    my ($valRows, $attrValRows) = _cloneAndUnhingeAttrs($inValRows);
-
-    return $self->{'meta-db'}->changeClient($clientIDs, $valRows, $attrValRows);
-}
-
-#=item C<setClientAttr($clientID, $attrName, $attrValue)>
-#
-#Sets a value for an attribute of the given client. If the client already
-#has a value for this attribute, it will be overwritten.
-#
-#=over
-#
-#=item Param C<clientID>
-#
-#The ID of the client whose attribute shall be changed.
-#
-#=item Param C<attrName>
-#
-#The name of the attribute to change.
-#
-#=item Param C<attrValue>
-#
-#The new value for the attribute.
-#
-#=item Return Value
-#
-#C<1> if the attribute could be set, C<undef> if not.
-#
-#=back
-#
-#=cut
-#
-#sub setClientAttr
-#{
-#    my $self      = shift;
-#    my $clientID  = shift;
-#    my $attrName  = shift;
-#    my $attrValue = shift;
-#
-#    return $self->{'meta-db'}->setClientAttr($clientID, $attrName, $attrValue);
-#}
-
-=item C<setSystemIDsOfClient($clientID, @$systemIDs)>
-
-Specifies all systems that should be offered for booting by the given client.
-
-=over
-
-=item Param C<clientID>
-
-The ID of the client whose systems you'd like to specify.
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be connected to the
-client.
-
-=item Return Value
-
-C<1> if the client/system references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub setSystemIDsOfClient
-{
-    my $self      = shift;
-    my $clientID  = shift;
-    my $systemIDs = _aref(shift);
-
-    # filter out the default system, as no client should be associated to it
-    my @uniqueSystemIDs = grep { $_ > 0; } _unique(@$systemIDs);
-
-    return $self->{'meta-db'}->setSystemIDsOfClient(
-        $clientID, \@uniqueSystemIDs
-    );
-}
-
-=item C<addSystemIDsToClient($clientID, @$systemIDs)>
-
-Adds some systems to the set that should be offered for booting by the given client.
-
-=over
-
-=item Param C<clientID>
-
-The ID of the client to which you'd like to add systems to.
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the new systems that shall be added to the
-client.
-
-=item Return Value
-
-C<1> if the client/system references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub addSystemIDsToClient
-{
-    my $self         = shift;
-    my $clientID     = shift;
-    my $newSystemIDs = _aref(shift);
-
-    my @systemIDs = $self->{'meta-db'}->fetchSystemIDsOfClient($clientID);
-    push @systemIDs, @$newSystemIDs;
-
-    return $self->setSystemIDsOfClient($clientID, \@systemIDs);
-}
-
-=item C<removeSystemIDsFromClient($clientID, @$systemIDs)>
-
-Removes some systems from the set that should be offered for booting by the given client.
-
-=over
-
-=item Param C<clientID>
-
-The ID of the client to which you'd like to remove systems from.
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be removed from the
-client.
-
-=item Return Value
-
-C<1> if the client/system references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeSystemIDsFromClient
-{
-    my $self             = shift;
-    my $clientID         = shift;
-    my $removedSystemIDs = _aref(shift);
-
-    my %toBeRemoved;
-    @toBeRemoved{@$removedSystemIDs} = ();
-    my @systemIDs =
-      grep { !exists $toBeRemoved{$_} }
-      $self->{'meta-db'}->fetchSystemIDsOfClient($clientID);
-
-    return $self->setSystemIDsOfClient($clientID, \@systemIDs);
-}
-
-=item C<setGroupIDsOfClient($clientID, @$groupIDs)>
-
-Specifies all groups that the given client shall be part of.
-
-=over
-
-=item Param C<clientID>
-
-The ID of the client whose groups you'd like to specify.
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that the client should be part of.
-
-=item Return Value
-
-C<1> if the client/group references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub setGroupIDsOfClient
-{
-    my $self     = shift;
-    my $clientID = shift;
-    my $groupIDs = _aref(shift);
-
-    my @uniqueGroupIDs = _unique(@$groupIDs);
-
-    return $self->{'meta-db'}->setGroupIDsOfClient($clientID, \@uniqueGroupIDs);
-}
-
-=item C<addGroupIDsToClient($clientID, @$groupIDs)>
-
-Adds the given client to the given groups.
-
-=over
-
-=item Param C<clientID>
-
-The ID of the client that you'd like to add to the given groups.
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that shall be added to the
-client.
-
-=item Return Value
-
-C<1> if the client/group references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub addGroupIDsToClient
-{
-    my $self        = shift;
-    my $clientID    = shift;
-    my $newGroupIDs = _aref(shift);
-
-    my @groupIDs = $self->{'meta-db'}->fetchGroupIDsOfClient($clientID);
-    push @groupIDs, @$newGroupIDs;
-
-    return $self->setGroupIDsOfClient($clientID, \@groupIDs);
-}
-
-=item C<removeGroupsIDsFromClient($clientID, @$groupIDs)>
-
-Removes the given client from the given groups.
-
-=over
-
-=item Param C<clientID>
-
-The ID of the client that you'd like to remove from the given groups.
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that shall be removed from the
-client.
-
-=item Return Value
-
-C<1> if the client/group references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeGroupIDsFromClient
-{
-    my $self                = shift;
-    my $clientID            = shift;
-    my $toBeRemovedGroupIDs = _aref(shift);
-
-    my %toBeRemoved;
-    @toBeRemoved{@$toBeRemovedGroupIDs} = ();
-    my @groupIDs =
-      grep { !exists $toBeRemoved{$_} }
-      $self->{'meta-db'}->fetchGroupIDsOfClient($clientID);
-
-    return $self->setGroupIDsOfClient($clientID, \@groupIDs);
-}
-
-=item C<addGroup(@$valRows)>
-
-Adds one or more groups to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new group(s).
-
-=item Return Value
-
-The IDs of the new group(s), C<undef> if the creation failed.
-
-=back
-
-=cut
-
-sub addGroup
-{
-    my $self      = shift;
-    my $inValRows = _aref(shift);
-
-    _checkCols($inValRows, 'group', qw(name));
-
-    my ($valRows, $attrValRows) = _cloneAndUnhingeAttrs($inValRows);
-
-    foreach my $valRow (@$valRows) {
-        if (!defined $valRow->{priority}) {
-            $valRow->{priority} = '50';
-        }
-    }
-    my @IDs = $self->{'meta-db'}->addGroup($valRows, $attrValRows);
-    return wantarray() ? @IDs : $IDs[0];
-}
-
-=item C<removeGroup(@$groupIDs)>
-
-Removes one or more groups from the database.
-
-=over
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that shall be removed.
-
-=item Return Value
-
-C<1> if the group(s) could be removed, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeGroup
-{
-    my $self     = shift;
-    my $groupIDs = _aref(shift);
-
-    foreach my $group (@$groupIDs) {
-        $self->setSystemIDsOfGroup($group, []);
-        $self->setClientIDsOfGroup($group, []);
-    }
-
-    return $self->{'meta-db'}->removeGroup($groupIDs);
-}
-
-#=item C<setGroupAttr($groupID, $attrName, $attrValue)>
-#
-#Sets a value for an attribute of the given group. If the group already
-#has a value for this attribute, it will be overwritten.
-#
-#=over
-#
-#=item Param C<groupID>
-#
-#The ID of the group whose attribute shall be changed.
-#
-#=item Param C<attrName>
-#
-#The name of the attribute to change.
-#
-#=item Param C<attrValue>
-#
-#The new value for the attribute.
-#
-#=item Return Value
-#
-#C<1> if the attribute could be set, C<undef> if not.
-#
-#=back
-#
-#=cut
-#
-#sub setGroupAttr
-#{
-#    my $self      = shift;
-#    my $groupID  = shift;
-#    my $attrName  = shift;
-#    my $attrValue = shift;
-#
-#    return $self->{'meta-db'}->setGroupAttr($groupID, $attrName, $attrValue);
-#}
-
-=item C<changeGroup(@$groupIDs, @$valRows)>
-
-Changes the data of one or more groups.
-
-=over
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the group(s).
-
-=item Return Value
-
-C<1> if the group(s) could be changed, C<undef> if not.
-
-=back
-
-=cut
-
-sub changeGroup
-{
-    my $self      = shift;
-    my $groupIDs  = _aref(shift);
-    my $inValRows = _aref(shift);
-
-    my ($valRows, $attrValRows) = _cloneAndUnhingeAttrs($inValRows);
-
-    return $self->{'meta-db'}->changeGroup($groupIDs, $valRows, $attrValRows);
-}
-
-=item C<setClientIDsOfGroup($groupID, @$clientIDs)>
-
-Specifies all clients that should be part of the given group.
-
-=over
-
-=item Param C<groupID>
-
-The ID of the group whose clients you'd like to specify.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be part of the group.
-
-=item Return Value
-
-C<1> if the group/client references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub setClientIDsOfGroup
-{
-    my $self      = shift;
-    my $groupID   = shift;
-    my $clientIDs = _aref(shift);
-
-    my @uniqueClientIDs = _unique(@$clientIDs);
-
-    return $self->{'meta-db'}->setClientIDsOfGroup($groupID, \@uniqueClientIDs);
-}
-
-=item C<addClientIDsToGroup($groupID, @$clientIDs)>
-
-Add some clients to the given group.
-
-=over
-
-=item Param C<groupID>
-
-The ID of the group to which you'd like to add clients.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be added.
-
-=item Return Value
-
-C<1> if the group/client references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub addClientIDsToGroup
-{
-    my $self         = shift;
-    my $groupID      = shift;
-    my $newClientIDs = _aref(shift);
-
-    my @clientIDs = $self->{'meta-db'}->fetchClientIDsOfGroup($groupID);
-    push @clientIDs, @$newClientIDs;
-
-    return $self->setClientIDsOfGroup($groupID, \@clientIDs);
-}
-
-=item C<removeClientIDsFromGroup($groupID, @$clientIDs)>
-
-Remove some clients from the given group.
-
-=over
-
-=item Param C<groupID>
-
-The ID of the group from which you'd like to remove clients.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be removed.
-
-=item Return Value
-
-C<1> if the group/client references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeClientIDsFromGroup
-{
-    my $self             = shift;
-    my $groupID          = shift;
-    my $removedClientIDs = _aref(shift);
-
-    my %toBeRemoved;
-    @toBeRemoved{@$removedClientIDs} = ();
-    my @clientIDs =
-      grep { !exists $toBeRemoved{$_} }
-      $self->{'meta-db'}->fetchClientIDsOfGroup($groupID);
-
-    return $self->setClientIDsOfGroup($groupID, \@clientIDs);
-}
-
-=item C<setSystemIDsOfGroup($groupID, @$systemIDs)>
-
-Specifies all systems that should be offered for booting by the given group.
-
-=over
-
-=item Param C<groupID>
-
-The ID of the group whose systems you'd like to specify.
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be connected to the
-group.
-
-=item Return Value
-
-C<1> if the group/system references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub setSystemIDsOfGroup
-{
-    my $self      = shift;
-    my $groupID   = shift;
-    my $systemIDs = _aref(shift);
-
-    # filter out the default system, as no group should be associated to it
-    my @uniqueSystemIDs = grep { $_ > 0; } _unique(@$systemIDs);
-
-    return $self->{'meta-db'}->setSystemIDsOfGroup($groupID, \@uniqueSystemIDs);
-}
-
-=item C<addSystemIDsToGroup($groupID, @$systemIDs)>
-
-Adds some systems to the set that should be offered for booting by the given group.
-
-=over
-
-=item Param C<groupID>
-
-The ID of the group to which you'd like to add systems.
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be added.
-
-=item Return Value
-
-C<1> if the group/system references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub addSystemIDsToGroup
-{
-    my $self         = shift;
-    my $groupID      = shift;
-    my $newSystemIDs = _aref(shift);
-
-    my @systemIDs = $self->{'meta-db'}->fetchSystemIDsOfGroup($groupID);
-    push @systemIDs, @$newSystemIDs;
-
-    return $self->setSystemIDsOfGroup($groupID, \@systemIDs);
-}
-
-=item C<removeSystemIDsFromGroup($groupID, @$systemIDs)>
-
-Removes some systems from the set that should be offered for booting by the given group.
-
-=over
-
-=item Param C<groupID>
-
-The ID of the group from which you'd like to remove systems.
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be removed.
-
-=item Return Value
-
-C<1> if the group/system references could be set, C<undef> if not.
-
-=back
-
-=cut
-
-sub removeSystemIDsFromGroup
-{
-    my $self             = shift;
-    my $groupID          = shift;
-    my $removedSystemIDs = _aref(shift);
-
-    my %toBeRemoved;
-    @toBeRemoved{@$removedSystemIDs} = ();
-    my @systemIDs =
-      grep { !exists $toBeRemoved{$_} }
-      $self->{'meta-db'}->fetchSystemIDsOfGroup($groupID);
-
-    return $self->setSystemIDsOfGroup($groupID, \@systemIDs);
-}
-
-=item C<emptyDatabase()>
-
-Removes all data from the database - the tables stay, but they will be empty.
-
-=over
-
-=item Return Value
-
-none
-
-=back
-
-=cut
-
-sub emptyDatabase
-{   # clears all user-data from the database
-    my $self = shift;
-
-    my @groupIDs = map { $_->{id} } $self->fetchGroupByFilter();
-    $self->removeGroup(\@groupIDs);
-
-    my @clientIDs = map { $_->{id} }
-      grep { $_->{name} ne '<<<default>>>' } $self->fetchClientByFilter();
-    $self->removeClient(\@clientIDs);
-
-    my @sysIDs = map { $_->{id} }
-      grep { $_->{name} ne '<<<default>>>' } $self->fetchSystemByFilter();
-    $self->removeSystem(\@sysIDs);
-
-    my @exportIDs = map { $_->{id} } $self->fetchExportByFilter();
-    $self->removeExport(\@exportIDs);
-
-    my @vendorOSIDs = map { $_->{id} } $self->fetchVendorOSByFilter();
-    $self->removeVendorOS(\@vendorOSIDs);
-
-    return 1;
-}
-
-=back
-
-=head2 Data Aggregation Methods
-
-=over
-
-=item C<mergeDefaultAttributesIntoSystem($system)>
-
-merges vendor-OS-specific plugin attributes and default system attributes into 
-the given system hash, and pushes the default client attributes on top of that.
-
-=over
-
-=item Param C<system>
-
-The system whose attributes shall be merged into (completed).
-
-=item Return Value
-
-none
-
-=back
-
-=cut
-
-sub mergeDefaultAttributesIntoSystem
-{
-    my $self             = shift;
-    my $system           = shift;
-    my $installedPlugins = shift;
-    my $originInfo       = shift;
-
-    # merge any attributes found in the plugins that are installed into
-    # the vendor-OS:
-    if (ref $installedPlugins eq 'ARRAY' && @$installedPlugins) {
-        for my $plugin (@$installedPlugins) {
-            mergeAttributes($system, $plugin, $originInfo, 'vendor-OS');
-        }
-
-        # the above will have merged stage1 attributes, too, so we remove
-        # these from the resulting system (as they do not apply to systems)
-        my @stage3AttrNames = OpenSLX::AttributeRoster->getStage3Attrs();
-        for my $attr (keys %{$system->{attrs}}) {
-            next if grep { $attr eq $_ } @stage3AttrNames;
-            delete $system->{attrs}->{$attr};
-        }
-    }
-
-    # merge yet unset stuff from default system
-    my $defaultSystem = $self->fetchSystemByFilter({name => '<<<default>>>'});
-    mergeAttributes($system, $defaultSystem, $originInfo, 'default-system');
-
-    # finally push the attributes specified for the default client (these
-    # overrule anything else)
-    my $defaultClient = $self->fetchClientByFilter({name => '<<<default>>>'});
-    pushAttributes($system, $defaultClient, $originInfo, 'default-client');
-
-    return 1;
-}
-
-=item C<mergeDefaultAndGroupAttributesIntoClient($client)>
-
-merges default and group configurations into the given client hash.
-
-=over
-
-=item Param C<client>
-
-The client whose attributes shall be merged into (completed).
-
-=item Return Value
-
-none
-
-=back
-
-=cut
-
-sub mergeDefaultAndGroupAttributesIntoClient
-{
-    my $self       = shift;
-    my $client     = shift;
-    my $originInfo = shift;
-
-    # step over all groups this client belongs to
-    # (ordered by priority from highest to lowest):
-    my @groupIDs = _unique(
-        $self->fetchGroupIDsOfClient(0), 
-        $self->fetchGroupIDsOfClient($client->{id})
-    );
-    my @groups
-        = sort { $a->{priority} <=> $b->{priority} }
-          $self->fetchGroupByID(\@groupIDs);
-    foreach my $group (@groups) {
-        # merge configuration from this group into the current client:
-        vlog(
-            3,
-            _tr('merging from group %d:%s...', $group->{id}, $group->{name})
-        );
-        mergeAttributes($client, $group, $originInfo, "group '$group->{name}'");
-    }
-
-    # merge configuration from default client:
-    vlog(3, _tr('merging from default client...'));
-    my $defaultClient = $self->fetchClientByFilter({name => '<<<default>>>'});
-    mergeAttributes($client, $defaultClient, $originInfo, 'default-client');
-
-    return 1;
-}
-
-=item C<aggregatedSystemIDsOfClient($client)>
-
-Returns an aggregated list of system-IDs that this client should offer for
-booting (as indicated by itself, the default client and the client's groups)
-
-=over
-
-=item Param C<client>
-
-The client whose aggregated systems you're interested in.
-
-=item Return Value
-
-A list of unqiue system-IDs.
-
-=back
-
-=cut
-
-sub aggregatedSystemIDsOfClient
-{
-    my $self   = shift;
-    my $client = shift;
-
-    # add all systems directly linked to client:
-    my @systemIDs = $self->fetchSystemIDsOfClient($client->{id});
-
-    # step over all groups this client belongs to:
-    my @groupIDs = $self->fetchGroupIDsOfClient($client->{id});
-    my @groups   = $self->fetchGroupByID(\@groupIDs);
-    foreach my $group (@groups) {
-        # add all systems that the client inherits from the current group:
-        push @systemIDs, $self->fetchSystemIDsOfGroup($group->{id});
-    }
-
-    # add all systems inherited from default client
-    my $defaultClient = $self->fetchClientByFilter({name => '<<<default>>>'});
-    push @systemIDs, $self->fetchSystemIDsOfClient($defaultClient->{id});
-
-    return _unique(@systemIDs);
-}
-
-=item C<aggregatedClientIDsOfSystem($system)>
-
-Returns an aggregated list of client-IDs that offer this system for
-booting (as indicated by itself, the default system and the system's groups)
-
-=over
-
-=item Param C<system>
-
-The system whose aggregated clients you're interested in.
-
-=item Return Value
-
-A list of unqiue client-IDs.
-
-=back
-
-=cut
-
-sub aggregatedClientIDsOfSystem
-{
-    my $self   = shift;
-    my $system = shift;
-
-    # add all clients directly linked to system:
-    my $defaultClient = $self->fetchClientByFilter({name => '<<<default>>>'});
-    my @clientIDs = $self->fetchClientIDsOfSystem($system->{id});
-
-    if (grep { $_ == $defaultClient->{id}; } @clientIDs) {
-        # add *all* client-IDs if the system is being referenced by
-        # the default client, as that means that all clients should offer
-        # this system for booting:
-        push(
-            @clientIDs,
-            map { $_->{id} } $self->fetchClientByFilter(undef, 'id')
-        );
-    }
-
-    # step over all groups this system belongs to:
-    my @groupIDs = $self->fetchGroupIDsOfSystem($system->{id});
-    my @groups   = $self->fetchGroupByID(\@groupIDs);
-    foreach my $group (@groups) {
-        # add all clients that the system inherits from the current group:
-        push @clientIDs, $self->fetchClientIDsOfGroup($group->{id});
-    }
-
-    # add all clients inherited from default system
-    my $defaultSystem = $self->fetchSystemByFilter({name => '<<<default>>>'});
-    push @clientIDs, $self->fetchClientIDsOfSystem($defaultSystem->{id});
-
-    return _unique(@clientIDs);
-}
-
-=item C<aggregatedSystemFileInfoFor($system)>
-
-Returns aggregated information about the kernel and initialramfs
-this system is using.
-
-=over
-
-=item Param C<system>
-
-The system whose aggregated info you're interested in.
-
-=item Return Value
-
-A hash containing detailled info about the vendor-OS and export used by
-this system, as well as the specific kernel-file and export-URI being used.
-
-=back
-
-=cut
-
-sub aggregatedSystemFileInfoFor
-{
-    my $self   = shift;
-    my $system = shift;
-
-    my $info = clone($system);
-
-    my $export = $self->fetchExportByID($system->{export_id});
-    if (!defined $export) {
-        die _tr(
-            "DB-problem: system '%s' references export with id=%s, but that doesn't exist!",
-            $system->{name}, $system->{export_id} || ''
-        );
-    }
-    $info->{'export'} = $export;
-
-    my $vendorOS = $self->fetchVendorOSByID($export->{vendor_os_id});
-    if (!defined $vendorOS) {
-        die _tr(
-            "DB-problem: export '%s' references vendor-OS with id=%s, but that doesn't exist!",
-            $export->{name}, $export->{vendor_os_id} || ''
-        );
-    }
-    $info->{'vendor-os'} = $vendorOS;
-    
-    my @installedPlugins = $self->fetchInstalledPlugins($vendorOS->{id});
-    $info->{'installed-plugins'} = \@installedPlugins;
-
-    # check if the specified kernel file really exists (follow links while
-    # checking) and if not, find the newest kernel file that is available.
-    my $kernelPath 
-        = "$openslxConfig{'private-path'}/stage1/$vendorOS->{name}/boot";
-    my $kernelFile = "$kernelPath/$system->{kernel}";
-    while (-l $kernelFile) {
-        $kernelFile = followLink($kernelFile);
-    }
-    if (!-e $kernelFile) {
-        # pick best kernel file available
-        my $osSetupEngine = instantiateClass("OpenSLX::OSSetup::Engine");
-        $osSetupEngine->initialize($vendorOS->{name}, 'none');
-        $kernelFile = $osSetupEngine->pickKernelFile($kernelPath);
-        warn(
-            _tr(
-                "setting kernel of system '%s' to '%s'!",
-                $info->{name}, basename($kernelFile)
-            )
-        );
-    }
-    $info->{'kernel-file'} = $kernelFile;
-
-    # auto-generate export_uri if none has been given
-    my $exportURI = $export->{'uri'} || '';
-    if ($exportURI !~ m[\w]) {
-        # instantiate OSExport engine and ask it for exportURI
-        my $osExportEngine = instantiateClass("OpenSLX::OSExport::Engine");
-        $osExportEngine->initializeFromExisting($export->{name});
-        $exportURI = $osExportEngine->generateExportURI($export, $vendorOS);
-    }
-    $info->{'export-uri'} = $exportURI;
-
-    return $info;
-}
-
-=back
-
-=head2 Support Functions
-
-=over
-
-=item C<mergeAttributes($target, $source)>
-
-Copies all attributes from source that are unset in target over (source extends target).
-
-=over
-
-=item Param C<target>
-
-The hash to be used as copy target.
-
-=item Param C<source>
-
-The hash to be used as copy source.
-
-=item Return Value
-
-none
-
-=back
-
-=cut
-
-sub mergeAttributes
-{
-    my $target     = shift;
-    my $source     = shift;
-    my $originInfo = shift;
-    my $origin     = shift;
-
-    my $sourceAttrs = $source->{attrs} || {};
-
-    $target->{attrs} ||= {};
-    my $targetAttrs = $target->{attrs};
-
-    foreach my $key (keys %$sourceAttrs) {
-        my $sourceVal = $sourceAttrs->{$key};
-        my $targetVal = $targetAttrs->{$key};
-        if (!defined $targetVal) {
-            vlog(3, _tr(
-                "merging %s (val=%s)", $key, 
-                defined $sourceVal ? $sourceVal : ''
-            ));
-            $targetAttrs->{$key} = $sourceVal;
-            if (defined $originInfo) {
-                $originInfo->{$key} = $origin;
-            }
-        }
-    }
-
-    return 1;
-}
-
-=item C<pushAttributes($target, $source)>
-
-Copies all attributes that are set in source into the target (source overrules target).
-
-=over
-
-=item Param C<target>
-
-The hash to be used as copy target.
-
-=item Param C<source>
-
-The hash to be used as copy source.
-
-=item Return Value
-
-none
-
-=back
-
-=cut
-
-sub pushAttributes
-{
-    my $target     = shift;
-    my $source     = shift;
-    my $originInfo = shift;
-    my $origin     = shift;
-
-    my $sourceAttrs = $source->{attrs} || {};
-
-    $target->{attrs} ||= {};
-    my $targetAttrs = $target->{attrs};
-
-    foreach my $key (keys %$sourceAttrs) {
-        my $sourceVal = $sourceAttrs->{$key};
-        if (defined $sourceVal) {
-            vlog(3, _tr("pushing %s (val=%s)", $key, $sourceVal));
-            $targetAttrs->{$key} = $sourceVal;
-            if (defined $originInfo) {
-                $originInfo->{$key} = $origin;
-            }
-        }
-    }
-
-    return 1;
-}
-
-=item C<externalIDForSystem($system)>
-
-Returns the given system's name as an external ID - worked into a
-state that is usable as a filename.
-
-=over
-
-=item Param C<system>
-
-The system you are interested in.
-
-=item Return Value
-
-The external ID (name) of the given system.
-
-=back
-
-=cut
-
-sub externalIDForSystem
-{
-    my $system = shift;
-
-    return "default" if $system->{name} eq '<<<default>>>';
-
-    my $name = $system->{name};
-    $name =~ tr[/][_];
-
-    return $name;
-}
-
-=item C<externalIDForClient($client)>
-
-Returns the given client's MAC as an external ID - worked into a
-state that is usable as a filename.
-
-=over
-
-=item Param C<client>
-
-The client you are interested in.
-
-=item Return Value
-
-The external ID (MAC) of the given client.
-
-=back
-
-=cut
-
-sub externalIDForClient
-{
-    my $client = shift;
-
-    return "default" if $client->{name} eq '<<<default>>>';
-
-    my $mac = lc($client->{mac});
-    # PXE seems to expect MACs being all lowercase
-    $mac =~ tr[:][-];
-
-    return "01-$mac";
-}
-
-=item C<externalConfigNameForClient($client)>
-
-Returns the given client's name as an external ID - worked into a
-state that is usable as a filename.
-
-=over
-
-=item Param C<client>
-
-The client you are interested in.
-
-=item Return Value
-
-The external name of the given client.
-
-=back
-
-=cut
-
-sub externalConfigNameForClient
-{
-    my $client = shift;
-
-    return "default" if $client->{name} eq '<<<default>>>';
-
-    my $name = $client->{name};
-    $name =~ tr[/][_];
-
-    return $name;
-}
-
-=item C<generatePlaceholdersFor($varName)>
-
-Returns the given variable as a placeholder - surrounded by '@@@' markers.
-
-=over
-
-=item Param C<varName>
-
-The variable you are interested in.
-
-=item Return Value
-
-The given variable as a placeholder string.
-
-=back
-
-=cut
-
-sub generatePlaceholderFor
-{
-    my $varName = shift;
-
-    return '@@@' . $varName . '@@@';
-}
-
-################################################################################
-### private stuff
-################################################################################
-sub _aref
-{   # transparently converts the given reference to an array-ref
-    my $ref = shift;
-
-    return [] unless defined $ref;
-    $ref = [$ref] unless ref($ref) eq 'ARRAY';
-
-    return $ref;
-}
-
-sub _unique
-{   # return given array filtered to unique elements
-    my %seenIDs;
-    return grep { !$seenIDs{$_}++; } @_;
-}
-
-sub _checkCols
-{
-    my $valRows  = shift;
-    my $table    = shift;
-    my @colNames = @_;
-
-    foreach my $valRow (@$valRows) {
-        foreach my $col (@colNames) {
-            die "need to set '$col' for $table!" if !$valRow->{$col};
-        }
-    }
-
-    return 1;
-}
-
-sub _cloneAndUnhingeAttrs
-{
-    my $inValRows = shift;
-
-    # clone data and unhinge attrs
-    my (@valRows, @attrValRows);
-    foreach my $inValRow (@$inValRows) {
-        push @attrValRows, $inValRow->{attrs};
-        my $valRow = clone($inValRow);
-        delete $valRow->{attrs};
-        push @valRows, $valRow;
-    }
-
-    return (\@valRows, \@attrValRows);
-}
-
-1;
diff --git a/config-db/OpenSLX/ConfigExport/DHCP/ISC.pm b/config-db/OpenSLX/ConfigExport/DHCP/ISC.pm
deleted file mode 100644
index 14b427c8..00000000
--- a/config-db/OpenSLX/ConfigExport/DHCP/ISC.pm
+++ /dev/null
@@ -1,45 +0,0 @@
-# Copyright (c) 2006, 2007 - OpenSLX GmbH
-#
-# This program is free software distributed under the GPL version 2.
-# See http://openslx.org/COPYING
-#
-# If you have any feedback please consult http://openslx.org/feedback and
-# send your suggestions, praise, or complaints to feedback@openslx.org
-#
-# General information about OpenSLX can be found at http://openslx.org/
-# -----------------------------------------------------------------------------
-# ISC.pm
-#    - provides ISC-specific implementation of DHCP export.
-# -----------------------------------------------------------------------------
-package OpenSLX::ConfigExport::DHCP::ISC;
-
-use strict;
-use warnings;
-
-our $VERSION = 1.01;        # API-version . implementation-version
-
-################################################################################
-### This class provides an ISC specific implementation for DHCP export.
-################################################################################
-use OpenSLX::Basics;
-
-################################################################################
-### implementation
-################################################################################
-sub new
-{
-    my $class = shift;
-    my $self = {};
-    return bless $self, $class;
-}
-
-sub execute
-{
-    my $self = shift;
-    my $clients = shift;
-
-    vlog(1, _tr("writing dhcp-config for %s clients", scalar(@$clients)));
-    foreach my $client (@$clients) {
-print "ISC-DHCP: $client->{name}\n";
-    }
-}
\ No newline at end of file
diff --git a/config-db/OpenSLX/DBSchema.pm b/config-db/OpenSLX/DBSchema.pm
deleted file mode 100644
index d3e7573b..00000000
--- a/config-db/OpenSLX/DBSchema.pm
+++ /dev/null
@@ -1,832 +0,0 @@
-# Copyright (c) 2006, 2007 - OpenSLX GmbH
-#
-# This program is free software distributed under the GPL version 2.
-# See http://openslx.org/COPYING
-#
-# If you have any feedback please consult http://openslx.org/feedback and
-# send your suggestions, praise, or complaints to feedback@openslx.org
-#
-# General information about OpenSLX can be found at http://openslx.org/
-# -----------------------------------------------------------------------------
-# DBSchema.pm
-#    - provides database schema of the OpenSLX config-db.
-# -----------------------------------------------------------------------------
-package OpenSLX::DBSchema;
-
-use strict;
-use warnings;
-
-use OpenSLX::Basics;
-
-################################################################################
-### DB-schema definition
-###     This hash-ref describes the current OpenSLX configuration database 
-###        schema.
-###        Each table is defined by a list of column descriptions (and optionally
-###        a list of default values).
-###     A column description is simply the name of the column followed by ':'
-###     followed by the data type description. The following data types are
-###     currently supported:
-###         b        => boolean (providing the values 1 and 0 only)
-###         i        => integer (32-bit, signed)
-###         s.20    => string, followed by length argument (in this case: 20)
-###         pk        => primary key (integer)
-###         fk        => foreign key (integer)
-################################################################################
-
-my $VERSION = 0.36;
-
-my $DbSchema = {
-    'version' => $VERSION,
-    'tables' => {
-        'client' => {
-            # a client is a PC booting via network
-            'cols' => [
-                'id:pk',            # primary key
-                'name:s.128',       # official name of PC (e.g. as given by sticker
-                                    # on case)
-                'mac:s.20',         # MAC of NIC used for booting
-                'comment:s.1024',   # internal comment (optional, for admins)
-            ],
-            'vals' => [
-                {   # add default client
-                    'id'         => 0,
-                    'name'       => '<<<default>>>',
-                    'comment'    => 'internal client that holds default values',
-                },
-            ],
-        },
-        'client_attr' => {
-            # attributes of clients
-            'cols' => [
-                'id:pk',            # primary key
-                'client_id:fk',     # foreign key to client
-                'name:s.128',       # attribute name
-                'value:s.255',      # attribute value
-            ],
-        },
-        'client_system_ref' => {
-            # clients referring to the systems they should offer for booting
-            'cols' => [
-                'client_id:fk',     # foreign key
-                'system_id:fk',     # foreign key
-            ],
-        },
-        'export' => {
-            # an export describes a vendor-OS "wrapped" in some kind of exporting
-            # format (NFS or NBD-squash). This represents the rootfs that the
-            # clients will see.
-            'cols' => [
-                'id:pk',            # primary key
-                'name:s.64',        # unique name of export, is automatically
-                                    # constructed like this:
-                                    #   <vendor-os-name>-<export-type>
-                'vendor_os_id:fk',  # foreign key
-                'comment:s.1024',   # internal comment (optional, for admins)
-                'type:s.10',        # 'nbd', 'nfs', ...
-                'server_ip:s.16',   # IP of exporting server, if empty the
-                                    # boot server will be used
-                'port:i',           # some export types need to use a specific
-                                    # port for each incarnation, if that's the
-                                    # case you can specify it here
-                'uri:s.255',        # path to export (squashfs or NFS-path), if
-                                    # empty it will be auto-generated by
-                                    # config-demuxer
-            ],
-        },
-        'global_info' => {
-            # a home for global counters and other info
-            'cols' => [
-                'id:s.32',          # key
-                'value:s.128',      # value
-            ],
-            'vals' => [
-                {   # add nbd-server-port
-                    'id' => 'next-nbd-server-port',
-                    'value' => '5000',
-                },
-            ],
-        },
-        'groups' => {
-            # a group encapsulates a set of clients as one entity, managing
-            # a group-specific attribute set. All the different attribute
-            # sets a client inherits via group membership are folded into
-            # one resulting attribute set with respect to each group's priority.
-            'cols' => [
-                'id:pk',            # primary key
-                'name:s.128',       # name of group
-                'priority:i',       # priority, used for order in group-list
-                                    # (from 0-highest to 99-lowest)
-                'comment:s.1024',   # internal comment (optional, for admins)
-            ],
-        },
-        'group_attr' => {
-            # attributes of groups
-            'cols' => [
-                'id:pk',            # primary key
-                'group_id:fk',      # foreign key to group
-                'name:s.128',       # attribute name
-                'value:s.255',      # attribute value
-            ],
-        },
-        'group_client_ref' => {
-            # groups referring to their clients
-            'cols' => [
-                'group_id:fk',      # foreign key
-                'client_id:fk',     # foreign key
-            ],
-        },
-        'group_system_ref' => {
-            # groups referring to the systems each of their clients should
-            # offer for booting
-            'cols' => [
-                'group_id:fk',      # foreign key
-                'system_id:fk',     # foreign key
-            ],
-        },
-        'installed_plugin' => {
-            # holds the plugins that have been installed into a specific 
-            # vendor-OS
-            'cols' => [
-                'id:pk',            # primary key
-                'vendor_os_id:fk',  # foreign key
-                'plugin_name:s.64', # name of installed plugin
-                                    # (e.g. suse-9.3-kde, debian-3.1-ppc,
-                                    # suse-10.2-cloned-from-kiwi).
-                                    # This is used as the folder name for the
-                                    # corresponding stage1, too.
-            ],
-        },
-        'installed_plugin_attr' => {
-            # (stage1-)attributes of installed plugins
-            'cols' => [
-                'id:pk',            # primary key
-                'installed_plugin_id:fk',    # foreign key to installed plugin
-                'name:s.128',       # attribute name
-                'value:s.255',      # attribute value
-            ],
-        },
-        'meta' => {
-            # information about the database as such
-            'cols' => [
-                'plugin_info_hash:s.32',    # hash-value identifying a specific
-                                            # set of plugins and their 
-                                            # attributes
-                'schema_version:s.5',       # schema-version currently 
-                                            # implemented by DB
-            ],
-            'vals' => [
-                {
-                    'plugin_info_hash' => '',
-                    'schema_version'   => $VERSION,
-                },
-            ],
-        },
-        'system' => {
-            # a system describes one bootable instance of an export, it
-            # represents a selectable line in the PXE boot menu of all the
-            # clients associated with this system
-            'cols' => [
-                'id:pk',              # primary key
-                'export_id:fk',       # foreign key
-                'name:s.64',          # unique name of system, is automatically
-                                      # constructed like this:
-                                      #   <vendor-os-name>-<export-type>-<kernel>
-                'label:s.64',         # name visible to user (pxe-label)
-                                      # if empty, this will be autocreated from
-                                      # the name
-                'kernel:s.128',       # path to kernel file, relative to /boot
-                'description:s.512',  # visible description (for PXE TEXT)
-                'pxe_prefix_ip:s.16', # ip prefix for PXE Menu entry
-                'comment:s.1024',     # internal comment (optional, for admins)
-            ],
-            'vals' => [
-                {   # add default system
-                    'id' => 0,
-                    'name' => '<<<default>>>',
-                    'comment' => 'internal system that holds default values',
-                },
-            ],
-        },
-        'system_attr' => {
-            # attributes of systems
-            'cols' => [
-                'id:pk',            # primary key
-                'system_id:fk',     # foreign key to system
-                'name:s.128',       # attribute name
-                'value:s.255',      # attribute value
-            ],
-        },
-        'vendor_os' => {
-            # a vendor-OS describes a folder containing an operating system as
-            # provided by the vendor (a.k.a. unchanged and thus updatable)
-            'cols' => [
-                'id:pk',            # primary key
-                'name:s.48',        # structured name of OS installation
-                                    # (e.g. suse-9.3-kde, debian-3.1-ppc,
-                                    # suse-10.2-cloned-from-kiwi).
-                                    # This is used as the folder name for the
-                                    # corresponding stage1, too.
-                'comment:s.1024',   # internal comment (optional, for admins)
-                'clone_source:s.255',   # if vendor-OS was cloned, this contains
-                                        # the rsync-URI pointing to the original
-            ],
-        },
-    },
-};
-
-################################################################################
-###
-### standard methods
-###
-################################################################################
-sub new
-{
-    my $class = shift;
-
-    my $self = {
-    };
-
-    return bless $self, $class;
-}
-
-sub checkAndUpgradeDBSchemaIfNecessary
-{
-    my $self     = shift;
-    my $configDB = shift;
-
-    my $metaDB = $configDB->{'meta-db'};
-
-    vlog(2, "trying to determine schema version...");
-    my $currVersion = $metaDB->schemaFetchDBVersion();
-    if (!defined $currVersion) {
-        # that's bad, someone has messed with our DB: there is a
-        # database, but the 'meta'-table is empty. 
-        # There might still be data in the other tables, but we have no way to 
-        # find out which schema version they're in. So it's safer to give up.
-        croak _tr('Could not determine schema version of database');
-    }
-
-    if ($currVersion == 0) {
-        vlog(1, _tr('Creating DB (schema version: %s)', $DbSchema->{version}));
-        foreach my $tableName (keys %{$DbSchema->{tables}}) {
-            # create table (optionally inserting default values, too)
-            $metaDB->schemaAddTable(
-                $tableName,
-                $DbSchema->{tables}->{$tableName}->{cols},
-                $DbSchema->{tables}->{$tableName}->{vals}
-            );
-        }
-        $metaDB->schemaSetDBVersion($DbSchema->{version});
-        $configDB->cleanupAnyInconsistencies() 
-            or die _tr('unable to cleanup DB!');
-        vlog(1, _tr('DB has been created successfully'));
-    } elsif ($currVersion < $DbSchema->{version}) {
-        vlog(
-            1,
-            _tr(
-                'Our schema-version is %s, DB is %s, upgrading DB...',
-                $DbSchema->{version}, $currVersion
-            )
-        );
-        $self->_schemaUpgradeDBFrom($metaDB, $currVersion);
-        $configDB->cleanupAnyInconsistencies() 
-            or die _tr('unable to cleanup DB!');
-        vlog(1, _tr('upgrade done'));
-    } else {
-        vlog(1, _tr('DB matches current schema version (%s)', $currVersion));
-    }
-
-    return 1;
-}
-
-sub getColumnsOfTable
-{
-    my $self      = shift;
-    my $tableName = shift;
-
-    return    
-        map { (/^(\w+)\W/) ? $1 : $_; } 
-        @{$DbSchema->{tables}->{$tableName}->{cols}};
-}
-
-################################################################################
-###
-### methods for upgrading the DB schema
-###
-################################################################################
-my %DbSchemaHistory;
-
-sub _schemaUpgradeDBFrom
-{
-    my $self        = shift;
-    my $metaDB      = shift;
-    my $currVersion = shift;
-
-    foreach my $version (sort { $a <=> $b } keys %DbSchemaHistory) {
-        next if $currVersion >= $version;
-
-        vlog(0, "upgrading schema version to $version");
-        if ($DbSchemaHistory{$version}->($metaDB)) {
-            $metaDB->schemaSetDBVersion($version);
-        }
-    }
-
-    return 1;
-}
-
-%DbSchemaHistory = (
-    0.2 => sub {
-        my $metaDB = shift;
-    
-        # move attributes into separate tables ...
-        #
-        # ... system attributes ...
-        $metaDB->schemaAddTable(
-            'system_attr', 
-            [
-                'id:pk',
-                'system_id:fk',
-                'name:s.128',
-                'value:s.255',
-            ]
-        );
-        foreach my $system ($metaDB->fetchSystemByFilter()) {
-            my %attrs;
-            foreach my $key (keys %$system) {
-                next if substr($key, 0, 5) ne 'attr_';
-                my $attrValue = $system->{$key} || '';
-                next if $system->{id} > 0 && !length($attrValue);
-                my $newAttrName = substr($key, 5);
-                $attrs{$newAttrName} = $attrValue;
-            }
-            $metaDB->setSystemAttrs($system->{id}, \%attrs);
-        }
-        $metaDB->schemaDropColumns(
-            'system',
-            [
-                'attr_automnt_dir',
-                'attr_automnt_src',
-                'attr_country',
-                'attr_dm_allow_shutdown',
-                'attr_hw_graphic',
-                'attr_hw_local_disk',
-                'attr_hw_monitor',
-                'attr_hw_mouse',
-                'attr_late_dm',
-                'attr_netbios_workgroup',
-                'attr_nis_domain',
-                'attr_nis_servers',
-                'attr_ramfs_fsmods',
-                'attr_ramfs_miscmods',
-                'attr_ramfs_nicmods',
-                'attr_ramfs_screen',
-                'attr_sane_scanner',
-                'attr_scratch',
-                'attr_slxgrp',
-                'attr_start_alsasound',
-                'attr_start_atd',
-                'attr_start_cron',
-                'attr_start_dreshal',
-                'attr_start_ntp',
-                'attr_start_nfsv4',
-                'attr_start_printer',
-                'attr_start_samba',
-                'attr_start_snmp',
-                'attr_start_sshd',
-                'attr_start_syslog',
-                'attr_start_x',
-                'attr_start_xdmcp',
-                'attr_tex_enable',
-                'attr_timezone',
-                'attr_tvout',
-                'attr_vmware',
-            ],
-            [
-                'id:pk',
-                'export_id:fk',
-                'name:s.64',
-                'label:s.64',
-                'kernel:s.128',
-                'kernel_params:s.512',
-                'hidden:b',
-                'comment:s.1024',
-            ]
-        );
-        #
-        # ... client attributes ...
-        $metaDB->schemaAddTable(
-            'client_attr',
-            [
-                'id:pk',
-                'client_id:fk',
-                'name:s.128',
-                'value:s.255',
-            ]
-        );
-        foreach my $client ($metaDB->fetchClientByFilter()) {
-            my %attrs;
-            foreach my $key (keys %$client) {
-                next if substr($key, 0, 5) ne 'attr_';
-                my $attrValue = $client->{$key} || '';
-                next if !length($attrValue);
-                my $newAttrName = substr($key, 5);
-                $attrs{$newAttrName} = $attrValue;
-            }
-            $metaDB->setClientAttrs($client->{id}, \%attrs);
-        }
-        $metaDB->schemaDropColumns(
-            'client',
-            [
-                'attr_automnt_dir',
-                'attr_automnt_src',
-                'attr_country',
-                'attr_dm_allow_shutdown',
-                'attr_hw_graphic',
-                'attr_hw_local_disk',
-                'attr_hw_monitor',
-                'attr_hw_mouse',
-                'attr_late_dm',
-                'attr_netbios_workgroup',
-                'attr_nis_domain',
-                'attr_nis_servers',
-                'attr_sane_scanner',
-                'attr_scratch',
-                'attr_slxgrp',
-                'attr_start_alsasound',
-                'attr_start_atd',
-                'attr_start_cron',
-                'attr_start_dreshal',
-                'attr_start_ntp',
-                'attr_start_nfsv4',
-                'attr_start_printer',
-                'attr_start_samba',
-                'attr_start_snmp',
-                'attr_start_sshd',
-                'attr_start_syslog',
-                'attr_start_x',
-                'attr_start_xdmcp',
-                'attr_tex_enable',
-                'attr_timezone',
-                'attr_tvout',
-                'attr_vmware',
-            ],
-            [
-                'id:pk',
-                'name:s.128',
-                'mac:s.20',
-                'boot_type:s.20',
-                'unbootable:b',
-                'kernel_params:s.128',
-                'comment:s.1024',
-            ]
-        );
-        #
-        # ... group attributes ...
-        $metaDB->schemaAddTable(
-            'group_attr',
-            [
-                'id:pk',
-                'group_id:fk',
-                'name:s.128',
-                'value:s.255',
-            ]
-        );
-        foreach my $group ($metaDB->fetchGroupByFilter()) {
-            my %attrs;
-            foreach my $key (keys %$group) {
-                next if substr($key, 0, 5) ne 'attr_';
-                my $attrValue = $group->{$key} || '';
-                next if !length($attrValue);
-                my $newAttrName = substr($key, 5);
-                $attrs{$newAttrName} = $attrValue;
-            }
-            $metaDB->setGroupAttrs($group->{id}, \%attrs);
-        }
-        $metaDB->schemaDropColumns(
-            'groups',
-            [
-                'attr_automnt_dir',
-                'attr_automnt_src',
-                'attr_country',
-                'attr_dm_allow_shutdown',
-                'attr_hw_graphic',
-                'attr_hw_local_disk',
-                'attr_hw_monitor',
-                'attr_hw_mouse',
-                'attr_late_dm',
-                'attr_netbios_workgroup',
-                'attr_nis_domain',
-                'attr_nis_servers',
-                'attr_sane_scanner',
-                'attr_scratch',
-                'attr_slxgrp',
-                'attr_start_alsasound',
-                'attr_start_atd',
-                'attr_start_cron',
-                'attr_start_dreshal',
-                'attr_start_ntp',
-                'attr_start_nfsv4',
-                'attr_start_printer',
-                'attr_start_samba',
-                'attr_start_snmp',
-                'attr_start_sshd',
-                'attr_start_syslog',
-                'attr_start_x',
-                'attr_start_xdmcp',
-                'attr_tex_enable',
-                'attr_timezone',
-                'attr_tvout',
-                'attr_vmware',
-            ],
-            [
-                'id:pk',
-                'name:s.128',
-                'priority:i',
-                'comment:s.1024',
-            ]
-        );
-    
-        return 1;
-    },
-    0.21 => sub {
-        my $metaDB = shift;
-    
-        # add new table installed_plugin
-        $metaDB->schemaAddTable(
-            'installed_plugin', 
-            [
-                'id:pk',
-                'vendor_os_id:fk',
-                'plugin_name:s.64',
-            ]
-        );
-    
-        return 1;
-    },
-    0.22 => sub {
-        my $metaDB = shift;
-    
-        # dummy schema change, just to trigger the attribute synchronization
-        # into the default system
-    
-        return 1;
-    },
-    0.23 => sub {
-        my $metaDB = shift;
-
-        # add new column system.description
-        $metaDB->schemaAddColumns(
-            'system',
-            [
-                'description:s.512',
-            ],
-            undef,
-            [
-                'id:pk',
-                'export_id:fk',
-                'name:s.64',
-                'label:s.64',
-                'kernel:s.128',
-                'kernel_params:s.512',
-                'hidden:b',
-                'description:s.512',
-                'comment:s.1024',
-            ]
-        );
-    
-        return 1;
-    },
-    0.24 => sub {
-        my $metaDB = shift;
-    
-        # split theme::name into theme::splash, theme::displaymanager and
-        # theme::desktop
-        foreach my $system ($metaDB->fetchSystemByFilter()) {
-            my $attrs = $system->{attrs} || {};
-            next if !exists $attrs->{'theme::name'};
-            $attrs->{'theme::splash'} 
-                = $attrs->{'theme::displaymanager'}
-                = $attrs->{'theme::desktop'} 
-                = $attrs->{'theme::name'};
-            delete $attrs->{'theme::name'};
-            $metaDB->setSystemAttrs($system->{id}, $attrs);
-        }
-    
-        # force all plugin names to lowercase
-        foreach my $vendorOS ($metaDB->fetchVendorOSByFilter()) {
-            my @installedPlugins 
-                = $metaDB->fetchInstalledPlugins($vendorOS->{id});
-            foreach my $plugin (@installedPlugins) {
-                my $pluginName = $plugin->{plugin_name};
-                $metaDB->removeInstalledPlugin($vendorOS->{id}, $pluginName);
-                $metaDB->addInstalledPlugin($vendorOS->{id}, lc($pluginName));
-            }
-        }
-
-        return 1;
-    },
-    0.25 => sub {
-        my $metaDB = shift;
-    
-        # drop attribute ramfs_screen
-        $metaDB->removeAttributeByName('ramfs_screen');
-    
-        return 1;
-    },
-    0.26 => sub {
-        my $metaDB = shift;
-    
-        # rename all exports and systems that contain a single colon to
-        # the current naming scheme with a double colon
-        foreach my $system ($metaDB->fetchSystemByFilter()) {
-            if ($system->{name} =~ m{^([^:]+):([^:]+)$}) {
-                if ($system->{label} eq $system->{name}) {
-                    $system->{label} = "${1}::${2}";
-                }
-                $system->{name} = "${1}::${2}";
-                $metaDB->changeSystem([ $system->{id} ], [ $system ]);
-            }
-        }
-        foreach my $export ($metaDB->fetchExportByFilter()) {
-            if ($export->{name} =~ m{^([^:]+):([^:]+)$}) {
-                $export->{name} = "${1}::${2}";
-                $metaDB->changeExport([ $export->{id} ], [ $export ]);
-            }
-        }
-    
-        return 1;
-    },
-    0.27 => sub {
-        my $metaDB = shift;
-    
-        # add default vendor-OS, which holds info about the plugins that shall
-        # be automatically installed into all vendor-OS that are being created.
-        $metaDB->addVendorOS([{
-            id      => '0',
-            name    => '<<<default>>>',
-            comment => 'holds default plugins for all vendor-OS',
-        }]);
-    
-        return 1;
-    },
-    0.28 => sub {
-        my $metaDB = shift;
-    
-        # correct effects of implementation error last time around that caused 
-        # the default vendor-OS to not have any plugins at all - so we add
-        # the default plugins here:
-# OLTA: deactivated for good since this does not work anymore with newer
-#       implementations (as addInstalledPlugin requires the table 
-#       'installed_plugin_attr', which is going to be created in db-schema 
-#       version 0.29 (see below)
-#        $metaDB->addInstalledPlugin(0, 'theme');
-    
-        return 1;
-    },
-    0.29 => sub {
-        my $metaDB = shift;
-    
-        # add new table installed_plugin_attrs
-        $metaDB->schemaAddTable(
-            'installed_plugin_attr', 
-            [
-                'id:pk',
-                'installed_plugin_id:fk',
-                'name:s.128',
-                'value:s.255',
-            ],
-        );
-    
-        return 1;
-    },
-    0.30 => sub {
-        my $metaDB = shift;
-    
-        # dummy schema change, just to trigger the attribute synchronization
-        # into the default system (required since plugins have been added
-        # and removed)
-    
-        return 1;
-    },
-    0.31 => sub {
-        my $metaDB = shift;
-    
-        # dummy schema change, just to trigger the attribute synchronization
-        # again, as the respective code has been extended
-    
-        return 1;
-    },
-    0.32 => sub {
-        my $metaDB = shift;
-    
-        # dummy schema change, just to trigger the attribute synchronization,
-        # as the 'theme' plugin has been removed
-    
-        return 1;
-    },
-    0.33 => sub {
-        my $metaDB = shift;
-
-        # add new column meta.plugin_info_hash
-        $metaDB->schemaAddColumns(
-            'meta',
-            [
-                'plugin_info_hash:s.32',
-            ],
-            undef,
-            [
-                'plugin_info_hash:s.32',
-                'schema_version:s.5',
-            ]
-        );
-    
-        return 1;
-    },
-    0.34 => sub {
-        my $metaDB = shift;
-
-        # turn client fields 'boot_type', 'kernel_params' and 'unbootable' 
-        # into attributes:
-        foreach my $client ($metaDB->fetchClientByFilter()) {
-            my $attrs = $metaDB->fetchClientAttrs($client->{id});
-            $attrs->{boot_type}            = $client->{boot_type} || 'pxe';
-            $attrs->{kernel_params_client} = $client->{kernel_params};
-            $attrs->{unbootable}           = $client->{unbootable};
-            $metaDB->setClientAttrs($client->{id}, $attrs);
-        }
-        $metaDB->schemaDropColumns(
-            'client',
-            [
-                'boot_type',
-                'kernel_params',
-                'unbootable',
-            ],
-            [
-                'id:pk',
-                'name:s.128',
-                'mac:s.20',
-                'comment:s.1024',
-            ]
-        );
-    
-        # turn system fields 'hidden' and 'kernel_params' into attributes:
-        foreach my $system ($metaDB->fetchSystemByFilter()) {
-            my $attrs = $metaDB->fetchSystemAttrs($system->{id});
-            $attrs->{hidden}        = $system->{hidden};
-            $attrs->{kernel_params} = $system->{kernel_params};
-            $metaDB->setSystemAttrs($system->{id}, $attrs);
-        }
-        $metaDB->schemaDropColumns(
-            'system',
-            [
-                'hidden',
-                'kernel_params',
-            ],
-            [
-                'id:pk',
-                'export_id:fk',
-                'name:s.64',
-                'label:s.64',
-                'kernel:s.128',
-                'description:s.512',
-                'comment:s.1024',
-            ]
-        );
-    
-        return 1;
-    },
-    0.35 => sub {
-        my $metaDB = shift;
-
-        # add new column system.pxe_prefix_ip
-        $metaDB->schemaAddColumns(
-            'system',
-            [
-                'pxe_prefix_ip:s.16',
-            ],
-            undef
-        );
-    
-        return 1;
-    },
-    0.36 => sub {
-        my $metaDB = shift;
-
-        # value 'preboot-cd' in client-attr 'boot_type' has been changed
-        # to 'preboot', and a separate attribute 'preboot_media' has been
-        # introduced:
-        foreach my $client ($metaDB->fetchClientByFilter()) {
-            my $attrs = $metaDB->fetchClientAttrs($client->{id});
-            if ($attrs->{boot_type} eq 'preboot-cd') {
-                $attrs->{boot_type} = 'preboot';
-                $attrs->{preboot_media} = 'cd';
-                $metaDB->setClientAttrs($client->{id}, $attrs);
-            }
-        }
-    
-        return 1;
-    },
-);
-
-1;
diff --git a/config-db/OpenSLX/MetaDB/Base.pm b/config-db/OpenSLX/MetaDB/Base.pm
deleted file mode 100644
index f1fbd0f5..00000000
--- a/config-db/OpenSLX/MetaDB/Base.pm
+++ /dev/null
@@ -1,1220 +0,0 @@
-# Copyright (c) 2006, 2007 - OpenSLX GmbH
-#
-# This program is free software distributed under the GPL version 2.
-# See http://openslx.org/COPYING
-#
-# If you have any feedback please consult http://openslx.org/feedback and
-# send your suggestions, praise, or complaints to feedback@openslx.org
-#
-# General information about OpenSLX can be found at http://openslx.org/
-# -----------------------------------------------------------------------------
-# Base.pm
-#    - provides empty base of the OpenSLX MetaDB API.
-# -----------------------------------------------------------------------------
-package OpenSLX::MetaDB::Base;
-
-use strict;
-use warnings;
-
-our $VERSION = 1.01;        # API-version . implementation-version
-
-use OpenSLX::Basics;
-
-################################################################################
-### basic functions
-################################################################################
-sub new
-{
-    confess "Don't create OpenSLX::MetaDB::Base - objects directly!";
-}
-
-sub connect        ## no critic (ProhibitBuiltinHomonyms)
-{
-}
-
-sub disconnect
-{
-}
-
-sub quote
-{
-}
-
-################################################################################
-### data access interface
-################################################################################
-sub fetchVendorOSByFilter
-{
-}
-
-sub fetchVendorOSByID
-{
-}
-
-sub fetchExportByFilter
-{
-}
-
-sub fetchExportByID
-{
-}
-
-sub fetchExportIDsOfVendorOS
-{
-}
-
-sub fetchSystemByFilter
-{
-}
-
-sub fetchSystemByID
-{
-}
-
-sub fetchSystemIDsOfExport
-{
-}
-
-sub fetchSystemIDsOfClient
-{
-}
-
-sub fetchSystemIDsOfGroup
-{
-}
-
-sub fetchClientByFilter
-{
-}
-
-sub fetchClientByID
-{
-}
-
-sub fetchClientIDsOfSystem
-{
-}
-
-sub fetchClientIDsOfGroup
-{
-}
-
-sub fetchGroupByFilter
-{
-}
-
-sub fetchGroupByID
-{
-}
-
-sub fetchGroupIDsOfClient
-{
-}
-
-sub fetchGroupIDsOfSystem
-{
-}
-
-################################################################################
-### data manipulation interface
-################################################################################
-sub generateNextIdForTable
-{   # some DBs (CSV for instance) aren't able to generate any IDs, so we
-    # offer an alternative way (by pre-specifying IDs for INSERTs).
-    # NB: if this method is called without a tablename, it returns:
-    #       1 if this backend requires manual ID generation
-    #       0 if not.
-    return;
-}
-
-sub addVendorOS
-{
-}
-
-sub removeVendorOS
-{
-}
-
-sub changeVendorOS
-{
-}
-
-sub addExport
-{
-}
-
-sub removeExport
-{
-}
-
-sub changeExport
-{
-}
-
-sub addSystem
-{
-}
-
-sub removeSystem
-{
-}
-
-sub changeSystem
-{
-}
-
-sub setClientIDsOfSystem
-{
-}
-
-sub setGroupIDsOfSystem
-{
-}
-
-sub addClient
-{
-}
-
-sub removeClient
-{
-}
-
-sub changeClient
-{
-}
-
-sub setSystemIDsOfClient
-{
-}
-
-sub setGroupIDsOfClient
-{
-}
-
-sub addGroup
-{
-}
-
-sub removeGroup
-{
-}
-
-sub changeGroup
-{
-}
-
-sub setClientIDsOfGroup
-{
-}
-
-sub setSystemIDsOfGroup
-{
-}
-
-################################################################################
-### schema related functions
-################################################################################
-sub schemaFetchDBVersion
-{
-}
-
-sub schemaSetDBVersion
-{
-}
-
-sub schemaCreate
-{
-}
-
-sub schemaUpgradeToCurrent
-{
-}
-
-sub schemaConvertTypeDescrToNative
-{
-}
-
-sub schemaAddTable
-{
-}
-
-sub schemaDropTable
-{
-}
-
-sub schemaRenameTable
-{
-}
-
-sub schemaAddColumns
-{
-}
-
-sub schemaDropColumns
-{
-}
-
-sub schemaChangeColumns
-{
-}
-
-1;
-################################################################################
-
-=pod
-
-=head1 NAME
-
-OpenSLX::MetaDB::Base - the base class for all MetaDB drivers
-
-=head1 SYNOPSIS
-
-  package OpenSLX::MetaDB::coolnewDB;
-
-  use vars qw(@ISA $VERSION);
-  @ISA = ('OpenSLX::MetaDB::Base');
-  $VERSION = 1.01;
-
-  my $superVersion = $OpenSLX::MetaDB::Base::VERSION;
-  if ($superVersion < $VERSION) {
-      croak _tr('Unable to load module <%s> (Version <%s> required)',
-                  'OpenSLX::MetaDB::Base', $VERSION);
-  }
-
-  use coolnewDB;
-
-  sub new
-  {
-      my $class = shift;
-      my $self = {};
-      return bless $self, $class;
-  }
-
-  sub connectConfigDB
-  {
-      my $self = shift;
-
-      my $dbName = $openslxConfig{'db-name'};
-      vlog(1, "trying to connect to coolnewDB-database <$dbName>");
-      $self->{'dbh'} = ... # get connection handle from coolnewDB
-  }
-
-  sub disconnectConfigDB
-  {
-      my $self = shift;
-
-      $self->{'dbh'}->disconnect;
-  }
-
-  # override all methods of OpenSLX::MetaDB::Base in order to implement
-  # a full MetaDB driver
-  ...
-
-I<The synopsis above outlines a class that implements a
-MetaDB driver for the (imaginary) database B<coolnewDB>>
-
-=head1 DESCRIPTION
-
-This class defines the MetaDB interface for the OpenSLX.
-
-Aim of the MetaDB abstraction is to make it possible to use a large set
-of different databases (from CSV-files to a fullblown Oracle-installation)
-transparently.
-
-While OpenSLX::ConfigDB represents the data layer to the outside world, each
-implementation of OpenSLX::MetaDB::Base provides a backend for a specific database.
-
-This way, the different OpenSLX-scripts do not have to burden
-themselves with any DB-specific details, they just request the data they want
-from the ConfigDB-layer and that in turn creates and communicates with the
-appropriate MetaDB driver in order to connect to the database and fetch and/or
-change the data as instructed.
-
-The MetaDB interface contains of four different parts:
-
-=over
-
-=item - L<basic methods> (connection handling and utilities)
-
-=item - L<data access methods> (getting data)
-
-=item - L<data manipulation methods> (adding, removing and changing data)
-
-=item - L<schema related methods> (migrating between different DB-versions)
-
-=back
-
-In order to implement a MetaDB driver for a specific database, you need
-to inherit from B<OpenSLX::MetaDB::Base> and implement the full interface. As this
-is quite some work, it might be wiser to actually inherit your driver from
-B<L<OpenSLX::MetaDB::DBI|OpenSLX::MetaDB::DBI>>, which is a default implementation for SQL databases.
-
-If there is a DBD-driver for the database your new MetaDB driver wants to talk
-to then all you need to do is inherit from B<OpenSLX::MetaDB::DBI> and then
-reimplement L<C<connectConfigDB>> (and maybe some other methods in order to
-improve efficiency).
-
-=head1 Special Concepts
-
-=over
-
-=item C<Filters>
-
-A filter is a hash-ref defining the filter criteria to be applied to a database
-query. Each key of the filter corresponds to a DB column and the (hash-)value
-contains the respective column value.
-
-[At a later stage, this will be improved to support a more structured approach
-to filtering (with boolean operators and hierarchical expressions)].
-
-=back
-
-=head1 Methods
-
-=head2 Basic Methods
-
-The following basic methods need to be implemented in a MetaDB driver:
-
-=over
-
-=item C<connectConfigDB()>
-
-Tries to establish a connection to the DBMS that this MetaDB driver deals with.
-The global configuration hash C<%config> contains further info about the
-requested connection. When implementing this method, you may have to look at
-the following entries in order to find out which database to connect to:
-
-=over
-
-=item C<$config{'db-spec'}>
-
-Full specification of database, a special string defining the
-precise database to connect to (this allows connecting to a database
-that requires specifications which aren't cared for by the existing
-C<%config>-entries).
-
-=item C<$config{'db-name'}>
-
-The precise name of the database that should be connected (defaults to 'openslx').
-
-=back
-
-=item C<disconnectConfigDB()>
-
-Tears down the connection to the DBMS that this MetaDB driver deals with and
-cleans up.
-
-=item C<quote(string)>
-
-Returns the given string quoted such that it can be used in SQL-statements
-(with respect to the corresponding DBMS).
-
-This usually involves putting
-single quotes around the string and escaping any single quote characters
-enclosed in the given string with a backslash.
-
-=back
-
-=head2 Data Access Methods
-
-The following methods need to be implemented in a MetaDB driver in order to
-allow the user to access data:
-
-=over
-
-=item C<fetchVendorOSByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all vendor-OSes that match the given
-filter.
-
-=over
-
-=item Param C<filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=item C<fetchVendorOSByID(@$ids, [$resultCols])>
-
-Fetches and returns information the vendor-OSes with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the vendor-OS-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=item C<fetchExportByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all exports that match the given
-filter.
-
-=over
-
-=item Param C<filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=item C<fetchExportByID(@$ids, [$resultCols])>
-
-Fetches and returns information the exports with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the export-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=item C<fetchExportIDsOfVendorOS($id)>
-
-Fetches the IDs of all exports that make use of the vendor-OS with the given ID.
-
-=over
-
-=item Param C<id>
-
-ID of the vendor-OS whose exports shall be returned.
-
-=item Return Value
-
-An array of system-IDs.
-
-=back
-
-=item C<fetchSystemByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all systems that match the given filter.
-
-=over
-
-=item Param C<$filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<$resultCols> [Optional]
-
-A comma-separated list of colunm names that shall be returned. If not defined,
-all available data must be returned.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=item C<fetchSystemByID(@$ids, [$resultCols])>
-
-Fetches and returns information the systems with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the system-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=item C<fetchSystemIDsOfExport($id)>
-
-Fetches the IDs of all systems that make use of the export with the given ID.
-
-=over
-
-=item Param C<id>
-
-ID of the export whose systems shall be returned.
-
-=item Return Value
-
-An array of system-IDs.
-
-=back
-
-=item C<fetchSystemIDsOfClient($id)>
-
-Fetches the IDs of all systems that are used by the client with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the client whose systems shall be returned.
-
-=item Return Value
-
-An array of system-IDs.
-
-=back
-
-=item C<fetchSystemIDsOfGroup($id)>
-
-Fetches the IDs of all systems that are part of the group with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the group whose systems shall be returned.
-
-=item Return Value
-
-An array of system-IDs.
-
-=back
-
-=item C<fetchClientByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all clients that match the given filter.
-
-=over
-
-=item Param C<$filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<$resultCols> [Optional]
-
-A comma-separated list of colunm names that shall be returned. If not defined,
-all available data must be returned.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=item C<fetchClientByID(@$ids, [$resultCols])>
-
-Fetches and returns information the clients with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the client-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-=item C<fetchClientIDsOfSystem($id)>
-
-Fetches the IDs of all clients that make use of the system with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the system whose clients shall be returned.
-
-=item Return Value
-
-An array of client-IDs.
-
-=back
-
-=item C<fetchClientIDsOfGroup($id)>
-
-Fetches the IDs of all clients that are part of the group with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the group whose clients shall be returned.
-
-=item Return Value
-
-An array of client-IDs.
-
-=back
-
-
-
-=item C<fetchGroupByFilter([%$filter], [$resultCols])>
-
-Fetches and returns information about all groups that match the given filter.
-
-=over
-
-=item Param C<$filter>
-
-A hash-ref containing the filter criteria that shall be applied - default
-is no filtering. See L</"Filters"> for more info.
-
-=item Param C<$resultCols> [Optional]
-
-A comma-separated list of colunm names that shall be returned. If not defined,
-all available data must be returned.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-
-
-=item C<fetchGroupByID(@$ids, [$resultCols])>
-
-Fetches and returns information the groups with the given IDs.
-
-=over
-
-=item Param C<ids>
-
-An array of the group-IDs you are interested in.
-
-=item Param C<resultCols>
-
-A string listing the columns that shall be returned - default is all columns.
-
-=item Return Value
-
-An array of hash-refs containing the resulting data rows.
-
-=back
-
-
-
-=item C<fetchGroupIDsOfClient($id)>
-
-Fetches the IDs of all groups that contain the client with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the client whose groups shall be returned.
-
-=item Return Value
-
-An array of client-IDs.
-
-=back
-
-
-
-=item C<fetchGroupIDsOfSystem($id)>
-
-Fetches the IDs of all groups that contain the system with the given
-ID.
-
-=over
-
-=item Param C<id>
-
-ID of the system whose groups shall be returned.
-
-=item Return Value
-
-An array of client-IDs.
-
-=back
-
-
-
-=head2 Data Manipulation Methods
-
-The following methods need to be implemented in a MetaDB driver in order to
-allow the user to access change the underlying:
-
-
-
-=item C<addVendorOS(@$valRows)>
-
-Adds one or more vendor-OS to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new vendor-OS(es).
-
-=item Return Value
-
-The IDs of the new vendor-OS(es), C<undef> if the creation failed.
-
-=back
-
-
-
-=item C<removeVendorOS(@$vendorOSIDs)>
-
-Removes one or more vendor-OS from the database.
-
-=over
-
-=item Param C<vendorOSIDs>
-
-An array-ref containing the IDs of the vendor-OSes that shall be removed.
-
-=item Return Value
-
-C<1> if the vendorOS(es) could be removed, C<undef> if not.
-
-=back
-
-
-
-=item C<changeVendorOS(@$vendorOSIDs, @$valRows)>
-
-Changes the data of one or more vendor-OS.
-
-=over
-
-=item Param C<vendorOSIDs>
-
-An array-ref containing the IDs of the vendor-OSes that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the vendor-OS(es).
-
-=item Return Value
-
-C<1> if the vendorOS(es) could be changed, C<undef> if not.
-
-=back
-
-
-
-=item C<addExport(@$valRows)>
-
-Adds one or more export to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new export(s).
-
-=item Return Value
-
-The IDs of the new export(s), C<undef> if the creation failed.
-
-=back
-
-
-
-=item C<removeExport(@$exportIDs)>
-
-Removes one or more export from the database.
-
-=over
-
-=item Param C<exportIDs>
-
-An array-ref containing the IDs of the exports that shall be removed.
-
-=item Return Value
-
-C<1> if the export(s) could be removed, C<undef> if not.
-
-=back
-
-
-
-=item C<changeExport(@$exportIDs, @$valRows)>
-
-Changes the data of one or more export.
-
-=over
-
-=item Param C<vendorOSIDs>
-
-An array-ref containing the IDs of the exports that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the export(s).
-
-=item Return Value
-
-C<1> if the export(s) could be changed, C<undef> if not.
-
-=back
-
-
-
-=item C<addSystem(@$valRows)>
-
-Adds one or more systems to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new system(s).
-
-=item Return Value
-
-The IDs of the new system(s), C<undef> if the creation failed.
-
-=back
-
-
-
-=item C<removeSystem(@$systemIDs)>
-
-Removes one or more systems from the database.
-
-=over
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be removed.
-
-=item Return Value
-
-C<1> if the system(s) could be removed, C<undef> if not.
-
-=back
-
-
-
-=item C<changeSystem(@$systemIDs, @$valRows)>
-
-Changes the data of one or more systems.
-
-=over
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the system(s).
-
-=item Return Value
-
-C<1> if the system(s) could be changed, C<undef> if not.
-
-=back
-
-
-
-=item C<setClientIDsOfSystem($systemID, @$clientIDs)>
-
-Specifies all clients that should offer the given system for booting.
-
-=over
-
-=item Param C<systemID>
-
-The ID of the system whose clients you'd like to specify.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be connected to the
-system.
-
-=item Return Value
-
-C<1> if the system/client references could be set, C<undef> if not.
-
-=back
-
-
-
-=item C<setGroupIDsOfSystem($systemID, @$groupIDs)>
-
-Specifies all groups that should offer the given system for booting.
-
-=over
-
-=item Param C<systemID>
-
-The ID of the system whose groups you'd like to specify.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the groups that shall be connected to the
-system.
-
-=item Return Value
-
-C<1> if the system/group references could be set, C<undef> if not.
-
-=back
-
-
-
-=item C<addClient(@$valRows)>
-
-Adds one or more clients to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new client(s).
-
-=item Return Value
-
-The IDs of the new client(s), C<undef> if the creation failed.
-
-=back
-
-
-
-=item C<removeClient(@$clientIDs)>
-
-Removes one or more clients from the database.
-
-=over
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be removed.
-
-=item Return Value
-
-C<1> if the client(s) could be removed, C<undef> if not.
-
-=back
-
-
-
-=item C<changeClient(@$clientIDs, @$valRows)>
-
-Changes the data of one or more clients.
-
-=over
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the client(s).
-
-=item Return Value
-
-C<1> if the client(s) could be changed, C<undef> if not.
-
-=back
-
-
-
-=item C<setSystemIDsOfClient($clientID, @$clientIDs)>
-
-Specifies all systems that should be offered for booting by the given client.
-
-=over
-
-=item Param C<clientID>
-
-The ID of the client whose systems you'd like to specify.
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be connected to the
-client.
-
-=item Return Value
-
-C<1> if the client/system references could be set, C<undef> if not.
-
-=back
-
-
-
-=item C<setGroupIDsOfClient($clientID, @$groupIDs)>
-
-Specifies all groups that the given client shall be part of.
-
-=over
-
-=item Param C<clientID>
-
-The ID of the client whose groups you'd like to specify.
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that the client should be part of.
-
-=item Return Value
-
-C<1> if the client/group references could be set, C<undef> if not.
-
-=back
-
-
-
-=item C<addGroup(@$valRows)>
-
-Adds one or more groups to the database.
-
-=over
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the data of the new group(s).
-
-=item Return Value
-
-The IDs of the new group(s), C<undef> if the creation failed.
-
-=back
-
-
-
-=item C<removeGroup(@$groupIDs)>
-
-Removes one or more groups from the database.
-
-=over
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that shall be removed.
-
-=item Return Value
-
-C<1> if the group(s) could be removed, C<undef> if not.
-
-=back
-
-
-
-=item C<changeGroup(@$groupIDs, @$valRows)>
-
-Changes the data of one or more groups.
-
-=over
-
-=item Param C<groupIDs>
-
-An array-ref containing the IDs of the groups that shall be changed.
-
-=item Param C<valRows>
-
-An array-ref containing hash-refs with the new data for the group(s).
-
-=item Return Value
-
-C<1> if the group(s) could be changed, C<undef> if not.
-
-=back
-
-
-
-=item C<setClientIDsOfGroup($groupID, @$clientIDs)>
-
-Specifies all clients that should be part of the given group.
-
-=over
-
-=item Param C<groupID>
-
-The ID of the group whose clients you'd like to specify.
-
-=item Param C<clientIDs>
-
-An array-ref containing the IDs of the clients that shall be part of the group.
-
-=item Return Value
-
-C<1> if the group/client references could be set, C<undef> if not.
-
-=back
-
-
-
-=item C<setSystemIDsOfGroup($groupID, @$groupIDs)>
-
-Specifies all systems that should be offered for booting by the given group.
-
-=over
-
-=item Param C<groupID>
-
-The ID of the group whose systems you'd like to specify.
-
-=item Param C<systemIDs>
-
-An array-ref containing the IDs of the systems that shall be connected to the
-group.
-
-=item Return Value
-
-C<1> if the group/system references could be set, C<undef> if not.
-
-=back
-
-
-
-
-
-=head2 Schema Related Methods
-
-The following methods need to be implemented in a MetaDB driver in order to
-be able to automatically adjust to new database schema versions (by adding
-and/or removing tables and table-columns).
-
-=cut
diff --git a/config-db/OpenSLX/MetaDB/DBI.pm b/config-db/OpenSLX/MetaDB/DBI.pm
deleted file mode 100644
index a5a8e68e..00000000
--- a/config-db/OpenSLX/MetaDB/DBI.pm
+++ /dev/null
@@ -1,1540 +0,0 @@
-# Copyright (c) 2006, 2007 - OpenSLX GmbH
-#
-# This program is free software distributed under the GPL version 2.
-# See http://openslx.org/COPYING
-#
-# If you have any feedback please consult http://openslx.org/feedback and
-# send your suggestions, praise, or complaints to feedback@openslx.org
-#
-# General information about OpenSLX can be found at http://openslx.org/
-# -----------------------------------------------------------------------------
-# DBI.pm
-#    - provides DBI-based implementation of the OpenSLX MetaDB API.
-# -----------------------------------------------------------------------------
-package OpenSLX::MetaDB::DBI;
-
-use strict;
-use warnings;
-
-use base qw(OpenSLX::MetaDB::Base);
-
-use DBI;
-use OpenSLX::Basics;
-use OpenSLX::Utils;
-
-################################################################################
-### basics
-################################################################################
-sub new
-{
-    confess "Don't call OpenSLX::MetaDB::DBI::new directly!";
-}
-
-sub disconnect
-{
-    my $self = shift;
-
-    $self->{'dbh'}->disconnect;
-    $self->{'dbh'} = undef;
-    return;
-}
-
-sub quote
-{   # default implementation quotes any given values through the DBI
-    my $self = shift;
-
-    return $self->{'dbh'}->quote(@_);
-}
-
-sub startTransaction
-{   # default implementation passes on the request to the DBI
-    my $self = shift;
-
-    return $self->{'dbh'}->begin_work();
-}
-
-sub commitTransaction
-{   # default implementation passes on the request to the DBI
-    my $self = shift;
-
-    return $self->{'dbh'}->commit();
-}
-
-sub rollbackTransaction
-{   # default implementation passes on the request to the DBI
-    my $self = shift;
-
-    return $self->{'dbh'}->rollback();
-}
-
-################################################################################
-### data access
-################################################################################
-sub _trim
-{
-    my $s = shift;
-    $s =~ s[^\s*(.*?)\s*$][$1];
-    return $s;
-}
-
-sub _buildFilterClause
-{
-    my $self         = shift;
-    my $filter       = shift || {};
-    my $filterClause = shift || '';
-
-    my ($connector, $quotedVal);
-    foreach my $col (keys %$filter) {
-        $connector = !length($filterClause) ? 'WHERE' : 'AND';
-        if (defined $filter->{$col}) {
-            $quotedVal = $self->{dbh}->quote($filter->{$col});
-            $filterClause .= unshiftHereDoc(<<"            End-of-Here");
-                $connector $col = $quotedVal
-            End-of-Here
-        } else {
-            $filterClause .= unshiftHereDoc(<<"            End-of-Here");
-                $connector $col IS NULL
-            End-of-Here
-        }
-    }
-    
-    return $filterClause || '';
-}
-
-sub _buildAttrFilterClause
-{
-    my $self         = shift;
-    my $attrFilter   = shift || {};
-    my $table        = shift;
-    my $filterClause = shift || '';
-
-    my %tableMap = (
-        'client' => 'client',
-        'group'  => 'groups',
-        'system' => 'system',
-    );
-
-    my ($connector, $quotedName, $quotedValue);
-    foreach my $name (keys %$attrFilter) {
-        $connector = !length($filterClause) ? 'WHERE' : 'AND';
-        $quotedName = $self->{dbh}->quote($name);
-        if (defined $attrFilter->{$name}) {
-            $quotedValue = $self->{dbh}->quote($attrFilter->{$name});
-            $filterClause .= unshiftHereDoc(<<"            End-of-Here");
-                $connector EXISTS (
-                    SELECT name FROM ${table}_attr
-                    WHERE name = $quotedName 
-                    AND value = $quotedValue
-                    AND ${table}_id = $tableMap{$table}.id
-                )
-            End-of-Here
-        } else {
-            $filterClause .= unshiftHereDoc(<<"            End-of-Here");
-                $connector NOT EXISTS (
-                    SELECT name FROM ${table}_attr
-                    WHERE name = $quotedName 
-                    AND ${table}_id = $tableMap{$table}.id
-                )
-            End-of-Here
-        }
-    }
-
-    return $filterClause;
-}
-
-sub _doSelect
-{
-    my $self      = shift;
-    my $sql       = shift;
-    my $resultCol = shift;
-
-    my $dbh = $self->{'dbh'};
-
-    vlog(3, _trim($sql));
-    my $sth = $dbh->prepare($sql)
-        or croak _tr(
-            q[Can't prepare SQL-statement <%s> (%s)], $sql, $dbh->errstr
-        );
-    $sth->execute()
-        or croak _tr(
-            q[Can't execute SQL-statement <%s> (%s)], $sql, $dbh->errstr
-        );
-    my @vals;
-    while (my $row = $sth->fetchrow_hashref()) {
-        if (defined $resultCol) {
-            return $row->{$resultCol} unless wantarray();
-            push @vals, $row->{$resultCol};
-        } else {
-            return $row unless wantarray();
-            push @vals, $row;
-        }
-    }
-
-    # return undef if there's no result in scalar context
-    return if !wantarray();        
-
-    return @vals;
-}
-
-sub fetchVendorOSByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $filterClause = $self->_buildFilterClause($filter);
-    my $sql = "SELECT $resultCols FROM vendor_os $filterClause";
-    return $self->_doSelect($sql);
-}
-
-sub fetchVendorOSByID
-{
-    my $self       = shift;
-    my $ids        = shift;
-    my $resultCols = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $idStr = join ',', @$ids;
-    return if !length($idStr);
-    my $sql = "SELECT $resultCols FROM vendor_os WHERE id IN ($idStr)";
-    return $self->_doSelect($sql);
-}
-
-sub fetchInstalledPlugins
-{
-    my $self       = shift;
-    my $vendorOSID = shift;
-    my $pluginName = shift;
-    my $fullInfo   = shift || 0;
-
-    return if !defined $vendorOSID;
-    my $nameClause 
-        = defined $pluginName 
-            ? "AND plugin_name = '$pluginName'" 
-            : '';
-    my $sql = unshiftHereDoc(<<"    End-of-Here");
-        SELECT * FROM installed_plugin
-        WHERE vendor_os_id = '$vendorOSID'
-        $nameClause
-    End-of-Here
-    my @pluginInfos = $self->_doSelect($sql);
-    return if !@pluginInfos;
-    
-    @pluginInfos = map {
-        my $pluginInfo = $_;
-        my $sql = unshiftHereDoc(<<"        End-of-Here");
-            SELECT * FROM installed_plugin_attr
-            WHERE installed_plugin_id = '$pluginInfo->{id}'
-        End-of-Here
-        my @attrs = $self->_doSelect($sql);
-        $pluginInfo->{attrs} = {
-            map { 
-                ( $_->{name}, $fullInfo ? $_ : $_->{value} ) 
-            } @attrs
-        };
-        $pluginInfo;
-    }
-    @pluginInfos;
-    
-    return wantarray() ? @pluginInfos : $pluginInfos[0];
-}
-
-sub fetchExportByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $filterClause = $self->_buildFilterClause($filter);
-    my $sql = "SELECT $resultCols FROM export $filterClause";
-    return $self->_doSelect($sql);
-}
-
-sub fetchExportByID
-{
-    my $self       = shift;
-    my $ids        = shift;
-    my $resultCols = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $idStr = join ',', @$ids;
-    return if !length($idStr);
-    my $sql = "SELECT $resultCols FROM export WHERE id IN ($idStr)";
-    return $self->_doSelect($sql);
-}
-
-sub fetchExportIDsOfVendorOS
-{
-    my $self       = shift;
-    my $vendorOSID = shift;
-
-    my $sql = qq[
-        SELECT id FROM export WHERE vendor_os_id = '$vendorOSID'
-    ];
-    return $self->_doSelect($sql, 'id');
-}
-
-sub fetchGlobalInfo
-{
-    my $self = shift;
-    my $id   = shift;
-
-    return if !length($id);
-    my $sql = "SELECT value FROM global_info WHERE id = " . $self->quote($id);
-    return $self->_doSelect($sql, 'value');
-}
-
-sub fetchSystemByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-    my $attrFilter = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $filterClause = $self->_buildFilterClause($filter);
-    $filterClause = $self->_buildAttrFilterClause(
-        $attrFilter, 'system', $filterClause
-    );
-    my $sql = unshiftHereDoc(<<"    End-of-Here");
-        SELECT $resultCols FROM system
-        $filterClause
-    End-of-Here
-    return $self->_doSelect($sql);
-}
-
-sub fetchSystemByID
-{
-    my $self       = shift;
-    my $ids        = shift;
-    my $resultCols = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $idStr = join ',', @$ids;
-    return if !length($idStr);
-    my $sql = "SELECT $resultCols FROM system WHERE id IN ($idStr)";
-    return $self->_doSelect($sql);
-}
-
-sub fetchSystemAttrs
-{
-    my $self     = shift;
-    my $systemID = $self->{dbh}->quote(shift);
-
-    my $sql = unshiftHereDoc(<<"    End-of-Here");
-        SELECT name, value FROM system_attr
-        WHERE system_id = $systemID
-    End-of-Here
-    my @attrs = $self->_doSelect($sql);
-    my $Result = {};
-    foreach my $attr (@attrs) {
-        $Result->{$attr->{name}} = $attr->{value};
-    }
-    return $Result;
-}
-
-sub fetchSystemIDsOfExport
-{
-    my $self     = shift;
-    my $exportID = shift;
-
-    my $sql = qq[
-        SELECT id FROM system WHERE export_id = '$exportID'
-    ];
-    return $self->_doSelect($sql, 'id');
-}
-
-sub fetchSystemIDsOfClient
-{
-    my $self     = shift;
-    my $clientID = shift;
-
-    my $sql = qq[
-        SELECT system_id FROM client_system_ref WHERE client_id = '$clientID'
-    ];
-    return $self->_doSelect($sql, 'system_id');
-}
-
-sub fetchSystemIDsOfGroup
-{
-    my $self    = shift;
-    my $groupID = shift;
-
-    my $sql = qq[
-        SELECT system_id FROM group_system_ref WHERE group_id = '$groupID'
-    ];
-    return $self->_doSelect($sql, 'system_id');
-}
-
-sub fetchClientByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-    my $attrFilter = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $filterClause = $self->_buildFilterClause($filter);
-    $filterClause = $self->_buildAttrFilterClause(
-        $attrFilter, 'client', $filterClause
-    );
-    my $sql = unshiftHereDoc(<<"    End-of-Here");
-        SELECT $resultCols FROM client
-        $filterClause
-    End-of-Here
-    return $self->_doSelect($sql);
-}
-
-sub fetchClientByID
-{
-    my $self       = shift;
-    my $ids        = shift;
-    my $resultCols = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $idStr = join ',', @$ids;
-    return if !length($idStr);
-    my $sql = "SELECT $resultCols FROM client WHERE id IN ($idStr)";
-    return $self->_doSelect($sql);
-}
-
-sub fetchClientAttrs
-{
-    my $self     = shift;
-    my $clientID = $self->{dbh}->quote(shift);
-
-    my $sql = unshiftHereDoc(<<"    End-of-Here");
-        SELECT name, value FROM client_attr
-        WHERE client_id = $clientID
-    End-of-Here
-    my @attrs = $self->_doSelect($sql);
-    my $Result = {};
-    foreach my $attr (@attrs) {
-        $Result->{$attr->{name}} = $attr->{value};
-    }
-    return $Result;
-}
-
-sub fetchClientIDsOfSystem
-{
-    my $self     = shift;
-    my $systemID = shift;
-
-    my $sql = qq[
-        SELECT client_id FROM client_system_ref WHERE system_id = '$systemID'
-    ];
-    return $self->_doSelect($sql, 'client_id');
-}
-
-sub fetchClientIDsOfGroup
-{
-    my $self    = shift;
-    my $groupID = shift;
-
-    my $sql = qq[
-        SELECT client_id FROM group_client_ref WHERE group_id = '$groupID'
-    ];
-    return $self->_doSelect($sql, 'client_id');
-}
-
-sub fetchGroupByFilter
-{
-    my $self       = shift;
-    my $filter     = shift;
-    my $resultCols = shift;
-    my $attrFilter = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $filterClause = $self->_buildFilterClause($filter);
-    $filterClause = $self->_buildAttrFilterClause(
-        $attrFilter, 'group', $filterClause
-    );
-    my $sql = unshiftHereDoc(<<"    End-of-Here");
-        SELECT $resultCols FROM groups
-        $filterClause
-    End-of-Here
-    return $self->_doSelect($sql);
-}
-
-sub fetchGroupByID
-{
-    my $self       = shift;
-    my $ids        = shift;
-    my $resultCols = shift;
-
-    $resultCols = '*' unless (defined $resultCols);
-    my $idStr = join ',', @$ids;
-    return if !length($idStr);
-    my $sql = "SELECT $resultCols FROM groups WHERE id IN ($idStr)";
-    return $self->_doSelect($sql);
-}
-
-sub fetchGroupAttrs
-{
-    my $self    = shift;
-    my $groupID = $self->{dbh}->quote(shift);
-
-    my $sql = unshiftHereDoc(<<"    End-of-Here");
-        SELECT name, value FROM group_attr
-        WHERE group_id = $groupID
-    End-of-Here
-    my @attrs = $self->_doSelect($sql);
-    my $Result = {};
-    foreach my $attr (@attrs) {
-        $Result->{$attr->{name}} = $attr->{value};
-    }
-    return $Result;
-}
-
-sub fetchGroupIDsOfSystem
-{
-    my $self     = shift;
-    my $systemID = shift;
-
-    my $sql = qq[
-        SELECT group_id FROM group_system_ref WHERE system_id = '$systemID'
-    ];
-    return $self->_doSelect($sql, 'group_id');
-}
-
-sub fetchGroupIDsOfClient
-{
-    my $self     = shift;
-    my $clientID = shift;
-
-    my $sql = qq[
-        SELECT group_id FROM group_client_ref WHERE client_id = '$clientID'
-    ];
-    return $self->_doSelect($sql, 'group_id');
-}
-
-################################################################################
-### data manipulation functions
-################################################################################
-sub _doInsert
-{
-    my $self      = shift;
-    my $table     = shift;
-    my $valRows   = shift;
-    my $ignoreIDs = shift;
-
-    my $dbh    = $self->{'dbh'};
-    my $valRow = (@$valRows)[0];
-    return if !defined $valRow || !scalar keys %$valRow;
-
-    if ($table =~ m[_ref$]) {
-        # reference tables do not have IDs:
-        $ignoreIDs = 1;
-    }
-
-    my $needToGenerateIDs = $self->generateNextIdForTable(undef);
-    if (!$ignoreIDs && $needToGenerateIDs) {
-        # DB requires pre-specified IDs, so we add the 'id' column:
-        $valRow->{id} = undef unless exists $valRow->{id};
-    }
-    my @ids;
-    foreach my $valRow (@$valRows) {
-        if (!defined $valRow->{id} && !$ignoreIDs && $needToGenerateIDs) {
-            # let DB-backend pre-specify ID, as current DB can't generate IDs:
-            $valRow->{id} = $self->generateNextIdForTable($table);
-            vlog(3, "generated id for <$table> is <$valRow->{id}>");
-        }
-        my $cols = join ', ', keys %$valRow;
-        my $values = join ', ',
-          map { $self->quote($valRow->{$_}) } keys %$valRow;
-        my $sql = "INSERT INTO $table ( $cols ) VALUES ( $values )";
-        vlog(3, $sql);
-        my $sth = $dbh->prepare($sql)
-          or croak _tr(q[Can't insert into table <%s> (%s)], $table,
-            $dbh->errstr);
-        $sth->execute()
-          or croak _tr(q[Can't insert into table <%s> (%s)], $table,
-            $dbh->errstr);
-        if (!$ignoreIDs) {
-            my $lastID = $dbh->last_insert_id(undef, undef, $table, 'id');
-            if (!defined $valRow->{id}) {
-                # id has not been pre-specified, we need to fetch it from DB:
-                $valRow->{'id'} = $lastID;
-                vlog(3, "DB-generated id for <$table> is <$valRow->{id}>");
-            }
-            elsif ($valRow->{'id'} ne $lastID) {
-                # id has been pre-specified, but DB changed it, so we update
-                # it with the pre-specified value
-                my $sql2 = unshiftHereDoc(<<"                End-of-Here");
-                    UPDATE $table SET id='$valRow->{'id'}' WHERE id='$lastID'
-                End-of-Here
-                vlog(3, $sql2);
-                $dbh->do($sql2) or croak _tr(
-                    q[Can't update table <%s> (%s)], $table, $dbh->errstr
-                );
-            }
-        }
-        push @ids, $valRow->{'id'};
-    }
-    return wantarray() ? @ids : shift @ids;
-}
-
-sub _doDelete
-{
-    my $self                  = shift;
-    my $table                 = shift;
-    my $IDs                   = shift;
-    my $idCol                 = shift;
-    my $additionalWhereClause = shift;
-
-    my $dbh = $self->{'dbh'};
-
-    $IDs   = [undef] unless defined $IDs;
-    $idCol = 'id'    unless defined $idCol;
-    foreach my $id (@$IDs) {
-        my $sql = "DELETE FROM $table";
-        if (defined $id) {
-            $sql .= " WHERE $idCol = " . $self->quote($id);
-            if (defined $additionalWhereClause) {
-                $sql .= $additionalWhereClause;
-            }
-        }
-        vlog(3, $sql);
-        my $sth = $dbh->prepare($sql)
-          or croak _tr(q[Can't delete from table <%s> (%s)], $table,
-            $dbh->errstr);
-        $sth->execute()
-          or croak _tr(q[Can't delete from table <%s> (%s)], $table,
-            $dbh->errstr);
-    }
-    return 1;
-}
-
-sub _doUpdate
-{
-    my $self    = shift;
-    my $table   = shift;
-    my $IDs     = shift;
-    my $valRows = shift;
-
-    my $dbh    = $self->{'dbh'};
-    my $valRow = (@$valRows)[0];
-    return 1 if !defined $valRow || !scalar keys %$valRow;
-
-    my $idx = 0;
-    foreach my $valRow (@$valRows) {
-        my $id      = $IDs->[$idx++];
-        my %valData = %$valRow;
-        # fail if asked to change the column 'id', as that is bogus
-        return if exists $valData{id} && $valData{id} ne $id;
-        # filter column 'id' if present, as we don't want to write it
-        delete $valData{id};
-        my @cols = map { "$_ = " . $self->quote($valRow->{$_}) }
-          grep { $_ ne 'id' }
-          # filter column 'id' if present, as we don't want
-          # to update it!
-          keys %$valRow;
-        next if !@cols;
-        my $cols = join ', ', @cols;
-        my $sql = "UPDATE $table SET $cols";
-        if (defined $id) {
-            $sql .= " WHERE id = " . $self->quote($id);
-        }
-        vlog(3, $sql);
-        my $sth = $dbh->prepare($sql)
-          or croak _tr(q[Can't update table <%s> (%s)], $table, $dbh->errstr);
-        $sth->execute()
-          or croak _tr(q[Can't update table <%s> (%s)], $table, $dbh->errstr);
-    }
-    return 1;
-}
-
-sub _updateRefTable
-{
-    my $self        = shift;
-    my $table       = shift;
-    my $keyID       = shift;
-    my $newValueIDs = shift;
-    my $keyCol      = shift;
-    my $valueCol    = shift;
-    my $oldValueIDs = shift;
-
-    my %lastValueIDs;
-    @lastValueIDs{@$oldValueIDs} = ();
-
-    foreach my $valueID (@$newValueIDs) {
-        if (!exists $lastValueIDs{$valueID}) {
-            # value-ID is new, create it
-            my $valRow = {
-                $keyCol   => $keyID,
-                $valueCol => $valueID,
-            };
-            $self->_doInsert($table, [$valRow]);
-        } else {
-            # value-ID already exists, leave as is, but remove from hash:
-            delete $lastValueIDs{$valueID};
-        }
-    }
-
-    # all the remaining value-IDs need to be removed:
-    if (scalar keys %lastValueIDs) {
-        $self->_doDelete($table, [keys %lastValueIDs],
-            $valueCol, " AND $keyCol='$keyID'");
-    }
-    return 1;
-}
-
-sub _updateOneToManyRefAttr
-{
-    my $self       = shift;
-    my $table      = shift;
-    my $oneID      = shift;
-    my $newManyIDs = shift;
-    my $fkCol      = shift;
-    my $oldManyIDs = shift;
-
-    my %lastManyIDs;
-    @lastManyIDs{@$oldManyIDs} = ();
-
-    foreach my $id (@$newManyIDs) {
-        if (!exists $lastManyIDs{$id}) {
-            # ID has changed, update it
-            $self->_doUpdate($table, $id, [{$fkCol => $oneID}]);
-        } else {
-            # ID hasn't changed, leave as is, but remove from hash:
-            delete $lastManyIDs{$id};
-        }
-    }
-
-    # all the remaining many-IDs need to be set to 0:
-    foreach my $id (scalar keys %lastManyIDs) {
-        $self->_doUpdate($table, $id, [{$fkCol => '0'}]);
-    }
-    return 1;
-}
-
-sub addVendorOS
-{
-    my $self    = shift;
-    my $valRows = shift;
-
-    return $self->_doInsert('vendor_os', $valRows);
-}
-
-sub removeVendorOS
-{
-    my $self        = shift;
-    my $vendorOSIDs = shift;
-
-    return $self->_doDelete('vendor_os', $vendorOSIDs);
-}
-
-sub changeVendorOS
-{
-    my $self        = shift;
-    my $vendorOSIDs = shift;
-    my $valRows     = shift;
-
-    return $self->_doUpdate('vendor_os', $vendorOSIDs, $valRows);
-}
-
-sub addInstalledPlugin
-{
-    my $self        = shift;
-    my $vendorOSID  = shift;
-    my $pluginName  = shift;
-    my $newAttrs    = shift;
-
-    return if !defined $vendorOSID || !$pluginName;
-
-    my $installedPlugin 
-        = $self->fetchInstalledPlugins($vendorOSID, $pluginName, 1);
-    if (!$installedPlugin) {
-        return if !$self->_doInsert('installed_plugin', [ {
-            vendor_os_id => $vendorOSID,
-            plugin_name  => $pluginName,
-        } ] );
-        $installedPlugin 
-            = $self->fetchInstalledPlugins($vendorOSID, $pluginName, 1);
-    }
-    return if !$installedPlugin;
-
-    # determine the required attribute actions ...
-    my $oldAttrs = $installedPlugin->{attrs} || {};
-    my @attrsToBeInserted
-        = grep { 
-            exists $newAttrs->{$_} && !exists $oldAttrs->{$_}
-        } keys %$newAttrs;
-    my @attrsToBeDeleted = grep { !exists $newAttrs->{$_} } keys %$oldAttrs;
-    my @attrsToBeUpdated
-        = grep { 
-            exists $newAttrs->{$_} && exists $oldAttrs->{$_}
-            && ($oldAttrs->{$_}->{value} || '-') ne ($newAttrs->{$_} || '-')
-        } keys %$newAttrs;
-
-    # ... insert the new ones ...
-    my @attrData 
-        =   map {
-                {
-                    installed_plugin_id => $installedPlugin->{id},
-                    name                => $_,
-                    value               => $newAttrs->{$_},
-                }
-            }
-            @attrsToBeInserted;
-    $self->_doInsert('installed_plugin_attr', \@attrData);
-
-    # ... delete the old ones ...
-    my @oldIDs = map { $oldAttrs->{$_}->{id} } @attrsToBeDeleted;
-    $self->_doDelete('installed_plugin_attr', \@oldIDs);
-
-    # ... and update the changed ones ...
-    my @IDs   = map { $oldAttrs->{$_}->{id} } @attrsToBeUpdated;
-    @attrData = map { { value => $newAttrs->{$_} } } @attrsToBeUpdated;
-    $self->_doUpdate('installed_plugin_attr', \@IDs, \@attrData);
-
-    return 1;
-}
-
-sub removeInstalledPlugin
-{
-    my $self       = shift;
-    my $vendorOSID = shift;
-    my $pluginName = shift;
-
-    return if !defined $vendorOSID || !$pluginName;
-
-    my $plugin = $self->fetchInstalledPlugins($vendorOSID, $pluginName);
-    return if !$plugin;
-    return if !$self->_doDelete(
-        'installed_plugin_attr', [ $plugin->{id} ], 'installed_plugin_id' 
-    );
-    return $self->_doDelete('installed_plugin', [ $plugin->{id} ] );
-}
-
-sub addExport
-{
-    my $self    = shift;
-    my $valRows = shift;
-
-    return $self->_doInsert('export', $valRows);
-}
-
-sub removeExport
-{
-    my $self      = shift;
-    my $exportIDs = shift;
-
-    return $self->_doDelete('export', $exportIDs);
-}
-
-sub changeExport
-{
-    my $self      = shift;
-    my $exportIDs = shift;
-    my $valRows   = shift;
-
-    return $self->_doUpdate('export', $exportIDs, $valRows);
-}
-
-sub changeGlobalInfo
-{
-    my $self  = shift;
-    my $id    = shift;
-    my $value = shift;
-
-    return $self->_doUpdate('global_info', [$id], [{'value' => $value}]);
-}
-
-sub addSystem
-{
-    my $self        = shift;
-    my $valRows     = shift;
-    my $attrValRows = shift;
-
-    # ... store the systems to get the IDs ...
-    my @systemIDs = $self->_doInsert('system', $valRows);
-
-    # ... finally store the individual attribute sets
-    foreach my $id (@systemIDs) {
-        my $attrs = shift @$attrValRows;
-        next if !defined $attrs;
-        return if !$self->setSystemAttrs($id, $attrs);
-    }
-
-    return @systemIDs;
-}
-
-sub removeSystem
-{
-    my $self      = shift;
-    my $systemIDs = shift;
-
-    return $self->_doDelete('system', $systemIDs);
-}
-
-sub changeSystem
-{
-    my $self      = shift;
-    my $systemIDs = shift;
-    my $valRows   = shift;
-    my $attrValRows = shift;
-
-    # store the attribute hashes individually
-    foreach my $id (@$systemIDs) {
-        my $attrs = shift @$attrValRows;
-        next if !defined $attrs;
-        return if !$self->setSystemAttrs($id, $attrs);
-    }
-
-    # finally update all systems in one go
-    return $self->_doUpdate('system', $systemIDs, $valRows);
-}
-
-sub setSystemAttrs
-{
-    my $self     = shift;
-    my $systemID = shift;
-    my $newAttrs = shift;
-
-    # fetch info about existing attrs
-    my $sql = "SELECT * FROM system_attr WHERE system_id = $systemID";
-    my %oldAttrs = map { ($_->{name}, $_) } $self->_doSelect($sql);
-
-    # We write undefined attributes for the default system only, such that
-    # it shows all existing attributes. All other systems never write undefined 
-    # attributes (if they have not defined a specific attribute, it is 
-    # inherited from "above"). We encapsulate that decision in the following
-    # delegate
-    my $valueIsOK = sub {
-        my $value = shift;
-        return $systemID == 0 || defined $value;
-    };
-
-    # determine the required actions ...
-    my @attrsToBeInserted
-        = grep { 
-            $valueIsOK->($newAttrs->{$_}) && !exists $oldAttrs{$_}
-        } keys %$newAttrs;
-    my @attrsToBeDeleted 
-        = grep { 
-            !exists $newAttrs->{$_} || !$valueIsOK->($newAttrs->{$_}) 
-        } keys %oldAttrs;
-    my @attrsToBeUpdated
-        = grep { 
-            $valueIsOK->($newAttrs->{$_}) && exists $oldAttrs{$_}
-            && ((defined($oldAttrs{$_}->{value}) xor defined($newAttrs->{$_}))
-                || (defined($oldAttrs{$_}->{value}) && defined($newAttrs->{$_})
-                    && $oldAttrs{$_}->{value} ne $newAttrs->{$_}))
-        } keys %$newAttrs;
-
-    # ... insert the new ones ...
-    my @attrData 
-        =   map {
-                {
-                    system_id => $systemID,
-                    name      => $_,
-                    value     => $newAttrs->{$_},
-                }
-            }
-            @attrsToBeInserted;
-    $self->_doInsert('system_attr', \@attrData);
-
-    # ... delete the old ones ...
-    my @oldIDs = map { $oldAttrs{$_}->{id} } @attrsToBeDeleted;
-    $self->_doDelete('system_attr', \@oldIDs);
-
-    # ... and update the changed ones ...
-    my @IDs   = map { $oldAttrs{$_}->{id} } @attrsToBeUpdated;
-    @attrData = map { { value => $newAttrs->{$_} } } @attrsToBeUpdated;
-    $self->_doUpdate('system_attr', \@IDs, \@attrData);
-
-    return 1;
-}
-
-sub setClientIDsOfSystem
-{
-    my $self      = shift;
-    my $systemID  = shift;
-    my $clientIDs = shift;
-
-    my @currClients = $self->fetchClientIDsOfSystem($systemID);
-    return $self->_updateRefTable(
-        'client_system_ref', $systemID, $clientIDs, 'system_id', 'client_id', 
-        \@currClients
-    );
-}
-
-sub setGroupIDsOfSystem
-{
-    my $self     = shift;
-    my $systemID = shift;
-    my $groupIDs = shift;
-
-    my @currGroups = $self->fetchGroupIDsOfSystem($systemID);
-    return $self->_updateRefTable(
-        'group_system_ref', $systemID, $groupIDs, 'system_id', 'group_id', 
-        \@currGroups
-    );
-}
-
-sub addClient
-{
-    my $self    = shift;
-    my $valRows = shift;
-    my $attrValRows = shift;
-
-    # ... store the clients to get the IDs ...
-    my @clientIDs = $self->_doInsert('client', $valRows);
-
-    # ... finally store the individual attribute sets
-    foreach my $id (@clientIDs) {
-        my $attrs = shift @$attrValRows;
-        next if !defined $attrs;
-        return if !$self->setClientAttrs($id, $attrs);
-    }
-
-    return @clientIDs;
-}
-
-sub removeAttributeByName
-{
-    my $self     = shift;
-    my $attrName = shift;
-
-    return $self->_doDelete('system_attr', [ $attrName ], 'name')
-        && $self->_doDelete('client_attr', [ $attrName ], 'name')
-        && $self->_doDelete('group_attr', [ $attrName ], 'name');
-}
-
-sub removeClient
-{
-    my $self      = shift;
-    my $clientIDs = shift;
-
-    return $self->_doDelete('client', $clientIDs);
-}
-
-sub changeClient
-{
-    my $self        = shift;
-    my $clientIDs   = shift;
-    my $valRows     = shift;
-    my $attrValRows = shift;
-
-    # store the attribute hashes individually
-    foreach my $id (@$clientIDs) {
-        my $attrs = shift @$attrValRows;
-        next if !defined $attrs;
-        return if !$self->setClientAttrs($id, $attrs);
-    }
-
-    # finally update all systems in one go
-    return $self->_doUpdate('client', $clientIDs, $valRows);
-}
-
-sub setClientAttrs
-{
-    my $self     = shift;
-    my $clientID = shift;
-    my $newAttrs = shift;
-
-    # fetch info about existing attrs
-    my $sql = "SELECT * FROM client_attr WHERE client_id = $clientID";
-    my %oldAttrs = map { ($_->{name}, $_) } $self->_doSelect($sql);
-
-    # determine the required actions ...
-    my @attrsToBeInserted
-        = grep { 
-            defined $newAttrs->{$_} && !exists $oldAttrs{$_}
-        } keys %$newAttrs;
-    my @attrsToBeDeleted = grep { !defined $newAttrs->{$_} } keys %oldAttrs;
-    my @attrsToBeUpdated
-        = grep { 
-            defined $newAttrs->{$_} && exists $oldAttrs{$_}
-            && ($oldAttrs{$_}->{value} || '') ne ($newAttrs->{$_} || '')
-        } keys %$newAttrs;
-
-    # ... insert the new ones ...
-    my @attrData 
-        =   map {
-                {
-                    client_id => $clientID,
-                    name      => $_,
-                    value     => $newAttrs->{$_},
-                }
-            }
-            @attrsToBeInserted;
-    $self->_doInsert('client_attr', \@attrData);
-
-    # ... delete the old ones ...
-    my @oldIDs = map { $oldAttrs{$_}->{id} } @attrsToBeDeleted;
-    $self->_doDelete('client_attr', \@oldIDs);
-
-    # ... and update the changed ones ...
-    my @IDs   = map { $oldAttrs{$_}->{id} } @attrsToBeUpdated;
-    @attrData = map { { value => $newAttrs->{$_} } } @attrsToBeUpdated;
-    $self->_doUpdate('client_attr', \@IDs, \@attrData);
-
-    return 1;
-}
-
-sub setSystemIDsOfClient
-{
-    my $self      = shift;
-    my $clientID  = shift;
-    my $systemIDs = shift;
-
-    my @currSystems = $self->fetchSystemIDsOfClient($clientID);
-    return $self->_updateRefTable(
-        'client_system_ref', $clientID, $systemIDs, 'client_id', 'system_id', 
-        \@currSystems
-    );
-}
-
-sub setGroupIDsOfClient
-{
-    my $self     = shift;
-    my $clientID = shift;
-    my $groupIDs = shift;
-
-    my @currGroups = $self->fetchGroupIDsOfClient($clientID);
-    return $self->_updateRefTable(
-        'group_client_ref', $clientID, $groupIDs, 'client_id', 'group_id', 
-        \@currGroups
-    );
-}
-
-sub addGroup
-{
-    my $self        = shift;
-    my $valRows     = shift;
-    my $attrValRows = shift;
-
-    # ... store the groups to get the IDs ...
-    my @groupIDs = $self->_doInsert('groups', $valRows);
-
-    # ... finally store the individual attribute sets
-    foreach my $id (@groupIDs) {
-        my $attrs = shift @$attrValRows;
-        next if !defined $attrs;
-        return if !$self->setGroupAttrs($id, $attrs);
-    }
-
-    return @groupIDs;
-}
-
-sub removeGroup
-{
-    my $self     = shift;
-    my $groupIDs = shift;
-
-    return $self->_doDelete('groups', $groupIDs);
-}
-
-sub changeGroup
-{
-    my $self        = shift;
-    my $groupIDs    = shift;
-    my $valRows     = shift;
-    my $attrValRows = shift;
-
-    # store the attribute hashes individually
-    foreach my $id (@$groupIDs) {
-        my $attrs = shift @$attrValRows;
-        next if !defined $attrs;
-        return if !$self->setGroupAttrs($id, $attrs);
-    }
-
-    # finally update all groups in one go
-    return $self->_doUpdate('groups', $groupIDs, $valRows);
-}
-
-sub setGroupAttrs
-{
-    my $self     = shift;
-    my $groupID = shift;
-    my $newAttrs = shift;
-
-    # fetch info about existing attrs
-    my $sql = "SELECT * FROM group_attr WHERE group_id = $groupID";
-    my %oldAttrs = map { ($_->{name}, $_) } $self->_doSelect($sql);
-
-    # determine the required actions ...
-    my @attrsToBeInserted
-        = grep { 
-            defined $newAttrs->{$_} && !exists $oldAttrs{$_}
-        } keys %$newAttrs;
-    my @attrsToBeDeleted = grep { !defined $newAttrs->{$_} } keys %oldAttrs;
-    my @attrsToBeUpdated
-        = grep { 
-            defined $newAttrs->{$_} && exists $oldAttrs{$_}
-            && ($oldAttrs{$_}->{value} || '') ne ($newAttrs->{$_} || '')
-        } keys %$newAttrs;
-
-    # ... insert the new ones ...
-    my @attrData 
-        =   map {
-                {
-                    group_id => $groupID,
-                    name     => $_,
-                    value    => $newAttrs->{$_},
-                }
-            }
-            @attrsToBeInserted;
-    $self->_doInsert('group_attr', \@attrData);
-
-    # ... delete the old ones ...
-    my @oldIDs = map { $oldAttrs{$_}->{id} } @attrsToBeDeleted;
-    $self->_doDelete('group_attr', \@oldIDs);
-
-    # ... and update the changed ones ...
-    my @IDs   = map { $oldAttrs{$_}->{id} } @attrsToBeUpdated;
-    @attrData = map { { value => $newAttrs->{$_} } } @attrsToBeUpdated;
-    $self->_doUpdate('group_attr', \@IDs, \@attrData);
-
-    return 1;
-}
-
-sub setClientIDsOfGroup
-{
-    my $self      = shift;
-    my $groupID   = shift;
-    my $clientIDs = shift;
-
-    my @currClients = $self->fetchClientIDsOfGroup($groupID);
-    return $self->_updateRefTable(
-        'group_client_ref', $groupID, $clientIDs, 'group_id', 'client_id', 
-        \@currClients
-    );
-}
-
-sub setSystemIDsOfGroup
-{
-    my $self      = shift;
-    my $groupID   = shift;
-    my $systemIDs = shift;
-
-    my @currSystems = $self->fetchSystemIDsOfGroup($groupID);
-    return $self->_updateRefTable(
-        'group_system_ref', $groupID, $systemIDs, 'group_id', 'system_id', 
-        \@currSystems
-    );
-}
-
-################################################################################
-### schema related functions
-################################################################################
-sub _convertColDescrsToDBNativeString
-{
-    my $self      = shift;
-    my $colDescrs = shift;
-
-    my $colDescrString = join ', ', map {
-        # convert each column description into database native format
-        # (e.g. convert 'name:s.45' to 'name char(45)'):
-        if (!m[^\s*(\S+?)\s*:\s*(\S+?)\s*$]) {
-            croak _tr('UnknownDbSchemaColumnDescr', $_);
-        }
-        "$1 " . $self->schemaConvertTypeDescrToNative($2);
-    } @$colDescrs;
-    return $colDescrString;
-}
-
-sub _convertColDescrsToColNames
-{
-    my $self      = shift;
-    my $colDescrs = shift;
-
-    return map {
-        # convert each column description into database native format
-        # (e.g. convert 'name:s.45' to 'name char(45)'):
-        if (!m[^\s*(\S+?)\s*:.+$]) {
-            croak _tr('UnknownDbSchemaColumnDescr', $_);
-        }
-        $1;
-    } @$colDescrs;
-}
-
-sub _convertColDescrsToColNamesString
-{
-    my $self      = shift;
-    my $colDescrs = shift;
-
-    return join ', ', $self->_convertColDescrsToColNames($colDescrs);
-}
-
-sub schemaFetchDBVersion
-{
-    my $self = shift;
-
-    my $dbh = $self->{dbh};
-    local $dbh->{RaiseError} = 1;
-    my $row =
-      eval { $dbh->selectrow_hashref('SELECT schema_version FROM meta'); };
-    return 0 if $@;
-    # no database access possible
-    return unless defined $row;
-    # no entry in meta-table
-    return $row->{schema_version};
-}
-
-sub schemaSetDBVersion
-{
-    my $self      = shift;
-    my $dbVersion = shift;
-
-    $self->{dbh}->do("UPDATE meta SET schema_version = '$dbVersion'")
-        or croak _tr('Unable to set DB-schema version to %s!', $dbVersion);
-
-    return 1;
-}
-
-sub schemaFetchPluginInfoHashVal
-{
-    my $self = shift;
-
-    my $row 
-        = $self->{dbh}->selectrow_hashref('SELECT plugin_info_hash FROM meta');
-
-    return $row->{plugin_info_hash};
-}
-
-sub schemaSetPluginInfoHashVal
-{
-    my $self              = shift;
-    my $pluginInfoHashVal = shift;
-
-    $self->{dbh}->do("UPDATE meta SET plugin_info_hash = '$pluginInfoHashVal'")
-        or croak _tr(
-            'Unable to set plugin-info-hash-value to %s!', $pluginInfoHashVal
-        );
-
-    return 1;
-}
-
-sub schemaConvertTypeDescrToNative
-{   # a default implementation, many DBs need to override...
-    my $self      = shift;
-    my $typeDescr = lc(shift);
-
-    if ($typeDescr eq 'b') {
-        return 'integer';
-    } elsif ($typeDescr eq 'i') {
-        return 'integer';
-    } elsif ($typeDescr eq 'pk') {
-        return 'integer primary key';
-    } elsif ($typeDescr eq 'fk') {
-        return 'integer';
-    } elsif ($typeDescr =~ m[^s\.(\d+)$]i) {
-        return "varchar($1)";
-    } else {
-        croak _tr('UnknownDbSchemaTypeDescr', $typeDescr);
-    }
-}
-
-sub schemaAddTable
-{
-    my $self        = shift;
-    my $table       = shift;
-    my $colDescrs   = shift;
-    my $initialVals = shift;
-    my $isSubCmd    = shift;
-
-    my $dbh = $self->{'dbh'};
-    vlog(1, "adding table <$table> to schema...") unless $isSubCmd;
-    my $colDescrString = $self->_convertColDescrsToDBNativeString($colDescrs);
-    my $sql            = "CREATE TABLE $table ($colDescrString)";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak _tr(q[Can't create table <%s> (%s)], $table, $dbh->errstr);
-    if (defined $initialVals) {
-        # don't care about IDs if there's no 'id' column in this table
-        my $ignoreIDs = ($colDescrString !~ m[\bid\b]);
-        $self->_doInsert($table, $initialVals, $ignoreIDs);
-    }
-    return;
-}
-
-sub schemaDropTable
-{
-    my $self     = shift;
-    my $table    = shift;
-    my $isSubCmd = shift;
-
-    my $dbh = $self->{'dbh'};
-    vlog(1, "dropping table <$table> from schema...") unless $isSubCmd;
-    my $sql = "DROP TABLE $table";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak _tr(q[Can't drop table <%s> (%s)], $table, $dbh->errstr);
-    return;
-}
-
-sub schemaRenameTable
-{   # a rather simple-minded implementation that renames a table in several
-    # steps:
-    #     - create the new table
-    #     - copy the data over from the old one
-    #     - drop the old table
-    # This should be overriden for advanced DBs, as these more often than not
-    # implement the 'ALTER TABLE <old> RENAME TO <new>' SQL-command (which
-    # is much more efficient).
-    my $self      = shift;
-    my $oldTable  = shift;
-    my $newTable  = shift;
-    my $colDescrs = shift;
-    my $isSubCmd  = shift;
-
-    my $dbh = $self->{'dbh'};
-    vlog(1, "renaming table <$oldTable> to <$newTable>...") unless $isSubCmd;
-    my $colDescrString = $self->_convertColDescrsToDBNativeString($colDescrs);
-    my $sql            = "CREATE TABLE $newTable ($colDescrString)";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak _tr(q[Can't create table <%s> (%s)], $oldTable, $dbh->errstr);
-    my $colNamesString = $self->_convertColDescrsToColNamesString($colDescrs);
-    my @dataRows = $self->_doSelect("SELECT $colNamesString FROM $oldTable");
-    $self->_doInsert($newTable, \@dataRows);
-    $sql = "DROP TABLE $oldTable";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak _tr(q[Can't drop table <%s> (%s)], $oldTable, $dbh->errstr);
-    return;
-}
-
-sub schemaAddColumns
-{   # a rather simple-minded implementation that adds columns to a table
-    # in several steps:
-    #     - create a temp table with the new layout
-    #     - copy the data from the old table into the new one
-    #     - drop the old table
-    #     - rename the temp table to the original name
-    # This should be overriden for advanced DBs, as these more often than not
-    # implement the 'ALTER TABLE <table> ADD COLUMN <col>' SQL-command (which
-    # is much more efficient).
-    my $self              = shift;
-    my $table             = shift;
-    my $newColDescrs      = shift;
-    my $newColDefaultVals = shift;
-    my $colDescrs         = shift;
-    my $isSubCmd          = shift;
-
-    my $dbh         = $self->{'dbh'};
-    my $tempTable   = "${table}_temp";
-    my @newColNames = $self->_convertColDescrsToColNames($newColDescrs);
-    my $newColStr   = join ', ', @newColNames;
-    vlog(1, "adding columns <$newColStr> to table <$table>...")
-      unless $isSubCmd;
-    $self->schemaAddTable($tempTable, $colDescrs, undef, 1);
-
-    # copy the data from the old table to the new:
-    my @dataRows = $self->_doSelect("SELECT * FROM $table");
-    $self->_doInsert($tempTable, \@dataRows);
-    # N.B.: for the insert, we rely on the caller having added the new
-    # columns to the end of the table (if that isn't the case, things
-    # break here!)
-
-    if (defined $newColDefaultVals) {
-        # default values have been provided, we apply them now:
-        $self->_doUpdate($tempTable, undef, $newColDefaultVals);
-    }
-
-    $self->schemaDropTable($table, 1);
-    $self->schemaRenameTable($tempTable, $table, $colDescrs, 1);
-    return;
-}
-
-sub schemaDropColumns
-{   # a rather simple-minded implementation that drops columns from a table
-    # in several steps:
-    #     - create a temp table with the new layout
-    #     - copy the data from the old table into the new one
-    #     - drop the old table
-    #     - rename the temp table to the original name
-    # This should be overriden for advanced DBs, as these sometimes
-    # implement the 'ALTER TABLE <table> DROP COLUMN <col>' SQL-command (which
-    # is much more efficient).
-    my $self         = shift;
-    my $table        = shift;
-    my $dropColNames = shift;
-    my $colDescrs    = shift;
-    my $isSubCmd     = shift;
-
-    my $dbh        = $self->{'dbh'};
-    my $tempTable  = "${table}_temp";
-    my $dropColStr = join ', ', @$dropColNames;
-    vlog(1, "dropping columns <$dropColStr> from table <$table>...")
-      unless $isSubCmd;
-    $self->schemaAddTable($tempTable, $colDescrs, undef, 1);
-
-    # copy the data from the old table to the new:
-    my $colNamesString = $self->_convertColDescrsToColNamesString($colDescrs);
-    my @dataRows       = $self->_doSelect("SELECT $colNamesString FROM $table");
-    $self->_doInsert($tempTable, \@dataRows);
-
-    $self->schemaDropTable($table, 1);
-    $self->schemaRenameTable($tempTable, $table, $colDescrs, 1);
-    return;
-}
-
-sub schemaChangeColumns
-{   # a rather simple-minded implementation that changes columns
-    # in several steps:
-    #     - create a temp table with the new layout
-    #     - copy the data from the old table into the new one
-    #     - drop the old table
-    #     - rename the temp table to the original name
-    # This should be overriden for advanced DBs, as these sometimes
-    # implement the 'ALTER TABLE <table> CHANGE COLUMN <col>' SQL-command (which
-    # is much more efficient).
-    my $self       = shift;
-    my $table      = shift;
-    my $colChanges = shift;
-    my $colDescrs  = shift;
-    my $isSubCmd   = shift;
-
-    my $dbh          = $self->{'dbh'};
-    my $tempTable    = "${table}_temp";
-    my $changeColStr = join ', ', keys %$colChanges;
-    vlog(1, "changing columns <$changeColStr> of table <$table>...")
-      unless $isSubCmd;
-    $self->schemaAddTable($tempTable, $colDescrs, undef, 1);
-
-    # copy the data from the old table to the new:
-    my $colNamesString = $self->_convertColDescrsToColNamesString($colDescrs);
-    my @dataRows       = $self->_doSelect("SELECT * FROM $table");
-    foreach my $oldCol (keys %$colChanges) {
-        my $newCol =
-          $self->_convertColDescrsToColNamesString([$colChanges->{$oldCol}]);
-        # rename current column in all data-rows:
-        foreach my $row (@dataRows) {
-            $row->{$newCol} = $row->{$oldCol};
-            delete $row->{$oldCol};
-        }
-    }
-    $self->_doInsert($tempTable, \@dataRows);
-
-    $self->schemaDropTable($table, 1);
-    $self->schemaRenameTable($tempTable, $table, $colDescrs, 1);
-    return;
-}
-
-1;
-
-=head1 NAME
-
-DBI.pm - provides DBI-based implementation of the OpenSLX MetaDB API.
-
-=head1 SYNOPSIS
-
-This class is the base for all DBI-related metaDB variants.
-It provides a default implementation for every method, such that
-each DB-specific implementation needs to override only the methods
-that require a different implementation than the one provided here.
-
-=head1 NOTES
-
-In case you ask yourself why none of the SQL-statements in this
-file make use of SQL bind params (?), the answer is that at least
-one DBD-driver didn't like them at all. As the performance gains
-from bound params are not really necessary here, we simply do
-not use them.
-
diff --git a/config-db/OpenSLX/MetaDB/SQLite.pm b/config-db/OpenSLX/MetaDB/SQLite.pm
deleted file mode 100644
index 0846582f..00000000
--- a/config-db/OpenSLX/MetaDB/SQLite.pm
+++ /dev/null
@@ -1,130 +0,0 @@
-# Copyright (c) 2006, 2007 - OpenSLX GmbH
-#
-# This program is free software distributed under the GPL version 2.
-# See http://openslx.org/COPYING
-#
-# If you have any feedback please consult http://openslx.org/feedback and
-# send your suggestions, praise, or complaints to feedback@openslx.org
-#
-# General information about OpenSLX can be found at http://openslx.org/
-# -----------------------------------------------------------------------------
-# SQLite.pm
-#    - provides SQLite-specific overrides of the OpenSLX MetaDB API.
-# -----------------------------------------------------------------------------
-package OpenSLX::MetaDB::SQLite;
-
-use strict;
-use warnings;
-
-use base qw(OpenSLX::MetaDB::DBI);
-
-################################################################################
-### This class provides a MetaDB backend for SQLite databases.
-### - by default the db will be created inside a 'openslxdata-sqlite' directory.
-################################################################################
-use DBD::SQLite;
-use OpenSLX::Basics;
-
-################################################################################
-### implementation
-################################################################################
-sub new
-{
-    my $class = shift;
-    my $self  = {};
-    return bless $self, $class;
-}
-
-sub databaseExists
-{
-    my $self = shift;
-    
-    my $fullDBPath = $self->_getDBPath() . "/$openslxConfig{'db-name'}";
-    return -e $fullDBPath;
-}
-
-sub dropDatabase
-{
-    my $self = shift;
-    
-    if ($self->{dbh}) {
-        die "need to disconnect before you can drop the database!";
-    }
-    
-    my $fullDBPath = $self->_getDBPath() . "/$openslxConfig{'db-name'}";
-    system("rm -rf $fullDBPath") if -e $fullDBPath;
-}
-
-sub connect        ## no critic (ProhibitBuiltinHomonyms)
-{
-    my $self = shift;
-
-    my $dbSpec = $openslxConfig{'db-spec'};
-    if (!defined $dbSpec) {
-        # build $dbSpec from individual parameters:
-        my $dbPath = $self->_getDBPath;
-        system("mkdir -p $dbPath") unless -e $dbPath;
-        $dbSpec = "dbname=$dbPath/$openslxConfig{'db-name'}";
-    }
-    vlog(1, "trying to connect to SQLite-database <$dbSpec>");
-    $self->{'dbh'} = DBI->connect(
-        "dbi:SQLite:$dbSpec", undef, undef,    
-        {PrintError => 0, AutoCommit => 1, sqlite_unicode => 1}
-    ) or die _tr("Cannot connect to database <%s> (%s)", $dbSpec, $DBI::errstr);
-    return 1;
-}
-
-sub schemaRenameTable
-{
-    my $self      = shift;
-    my $oldTable  = shift;
-    my $newTable  = shift;
-    my $colDescrs = shift;
-    my $isSubCmd  = shift;
-
-    my $dbh = $self->{'dbh'};
-    vlog(1, "renaming table <$oldTable> to <$newTable>...") unless $isSubCmd;
-    my $sql = "ALTER TABLE $oldTable RENAME TO $newTable";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak(_tr(q[Can't rename table <%s> (%s)], $oldTable, $dbh->errstr));
-    return;
-}
-
-sub schemaAddColumns
-{
-    my $self              = shift;
-    my $table             = shift;
-    my $newColDescrs      = shift;
-    my $newColDefaultVals = shift;
-    my $colDescrs         = shift;
-    my $isSubCmd          = shift;
-
-    my $dbh         = $self->{'dbh'};
-    my $newColNames = $self->_convertColDescrsToColNamesString($newColDescrs);
-    vlog(1, "adding columns <$newColNames> to table <$table>")
-      unless $isSubCmd;    
-    foreach my $colDescr (@$newColDescrs) {
-        my $colDescrString =
-          $self->_convertColDescrsToDBNativeString([$colDescr]);
-        my $sql = "ALTER TABLE $table ADD COLUMN $colDescrString";
-        vlog(3, $sql);
-        $dbh->do($sql)
-          or croak(_tr(q[Can't add column to table <%s> (%s)], $table,
-            $dbh->errstr));
-    }
-    # if default values have been provided, we apply them now:
-    if (defined $newColDefaultVals) {
-        $self->_doUpdate($table, undef, $newColDefaultVals);
-    }
-    return;
-}
-
-sub _getDBPath
-{
-    my $self = shift;
-
-    return "$openslxConfig{'private-path'}/db/sqlite";
-}
-
-1;
diff --git a/config-db/OpenSLX/MetaDB/mysql.pm b/config-db/OpenSLX/MetaDB/mysql.pm
deleted file mode 100644
index 82487191..00000000
--- a/config-db/OpenSLX/MetaDB/mysql.pm
+++ /dev/null
@@ -1,179 +0,0 @@
-# Copyright (c) 2006, 2007 - OpenSLX GmbH
-#
-# This program is free software distributed under the GPL version 2.
-# See http://openslx.org/COPYING
-#
-# If you have any feedback please consult http://openslx.org/feedback and
-# send your suggestions, praise, or complaints to feedback@openslx.org
-#
-# General information about OpenSLX can be found at http://openslx.org/
-# -----------------------------------------------------------------------------
-# mysql.pm
-#    - provides mysql-specific overrides of the OpenSLX MetaDB API.
-# -----------------------------------------------------------------------------
-package OpenSLX::MetaDB::mysql;
-
-use strict;
-use warnings;
-
-use base qw(OpenSLX::MetaDB::DBI);
-
-################################################################################
-### This class provides a MetaDB backend for mysql databases.
-### - by default the db will be created inside a 'openslxdata-mysql' directory.
-################################################################################
-use DBD::mysql;
-use OpenSLX::Basics;
-use OpenSLX::Utils;
-
-################################################################################
-### implementation
-################################################################################
-sub new
-{
-    my $class = shift;
-    my $self  = {};
-    return bless $self, $class;
-}
-
-sub connect        ## no critic (ProhibitBuiltinHomonyms)
-{
-    my $self = shift;
-
-    my $dbSpec = $openslxConfig{'db-spec'};
-    if (!defined $dbSpec) {
-        # build $dbSpec from individual parameters:
-        $dbSpec = "database=$openslxConfig{'db-name'}";
-    }
-    my $dbUser
-        = $openslxConfig{'db-user'}
-            ? $openslxConfig{'db-user'}
-            : (getpwuid($>))[0];
-    my $dbPasswd = $openslxConfig{'db-passwd'};
-    if (!defined $dbPasswd) {
-        $dbPasswd = readPassword("db-password> ");
-    }
-    
-    vlog(1, "trying to connect user '$dbUser' to mysql-database '$dbSpec'");
-    $self->{'dbh'} = DBI->connect(
-        "dbi:mysql:$dbSpec", $dbUser, $dbPasswd, {
-            PrintError => 0,
-            mysql_auto_reconnect => 1,
-        }
-    ) or die _tr("Cannot connect to database '%s' (%s)", $dbSpec, $DBI::errstr);
-    return 1;
-}
-
-sub schemaConvertTypeDescrToNative
-{
-    my $self      = shift;
-    my $typeDescr = lc(shift);
-
-    if ($typeDescr eq 'b') {
-        return 'integer';
-    } elsif ($typeDescr eq 'i') {
-        return 'integer';
-    } elsif ($typeDescr eq 'pk') {
-        return 'integer AUTO_INCREMENT primary key';
-    } elsif ($typeDescr eq 'fk') {
-        return 'integer';
-    } elsif ($typeDescr =~ m[^s\.(\d+)$]i) {
-        return "varchar($1)";
-    } else {
-        croak _tr('UnknownDbSchemaTypeDescr', $typeDescr);
-    }
-    return;
-}
-
-sub schemaRenameTable
-{
-    my $self      = shift;
-    my $oldTable  = shift;
-    my $newTable  = shift;
-    my $colDescrs = shift;
-    my $isSubCmd  = shift;
-
-    my $dbh = $self->{'dbh'};
-    vlog(1, "renaming table <$oldTable> to <$newTable>...") unless $isSubCmd;
-    my $sql = "ALTER TABLE $oldTable RENAME TO $newTable";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak _tr(q[Can't rename table <%s> (%s)], $oldTable, $dbh->errstr);
-    return;
-}
-
-sub schemaAddColumns
-{
-    my $self              = shift;
-    my $table             = shift;
-    my $newColDescrs      = shift;
-    my $newColDefaultVals = shift;
-    my $colDescrs         = shift;
-    my $isSubCmd          = shift;
-
-    my $dbh         = $self->{'dbh'};
-    my $newColNames = $self->_convertColDescrsToColNamesString($newColDescrs);
-    vlog(1, "adding columns <$newColNames> to table <$table>") unless $isSubCmd;
-    my $addClause = join ', ',
-      map { "ADD COLUMN " . $self->_convertColDescrsToDBNativeString([$_]); }
-      @$newColDescrs;
-    my $sql = "ALTER TABLE $table $addClause";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak _tr(q[Can't add columns to table <%s> (%s)], $table,
-        $dbh->errstr);
-    # if default values have been provided, we apply them now:
-    if (defined $newColDefaultVals) {
-        $self->_doUpdate($table, undef, $newColDefaultVals);
-    }
-    return;
-}
-
-sub schemaDropColumns
-{
-    my $self         = shift;
-    my $table        = shift;
-    my $dropColNames = shift;
-    my $colDescrs    = shift;
-    my $isSubCmd     = shift;
-
-    my $dbh = $self->{'dbh'};
-    my $dropColStr = join ', ', @$dropColNames;
-    vlog(1,
-        "dropping columns <$dropColStr> from table <$table>...")   
-      unless $isSubCmd;
-    my $dropClause = join ', ', map { "DROP COLUMN $_" } @$dropColNames;
-    my $sql = "ALTER TABLE $table $dropClause";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak _tr(q[Can't drop columns from table <%s> (%s)], $table,
-        $dbh->errstr);
-    return;
-}
-
-sub schemaChangeColumns
-{
-    my $self       = shift;
-    my $table      = shift;
-    my $colChanges = shift;
-    my $colDescrs  = shift;
-    my $isSubCmd   = shift;
-
-    my $dbh = $self->{'dbh'};
-    my $changeColStr = join ', ', keys %$colChanges;
-    vlog(1, "changing columns <$changeColStr> in table <$table>...")
-      unless $isSubCmd;
-    my $changeClause = join ', ', map {
-        "CHANGE COLUMN $_ "
-          . $self->_convertColDescrsToDBNativeString([$colChanges->{$_}]);
-      }
-      keys %$colChanges;
-    my $sql = "ALTER TABLE $table $changeClause";
-    vlog(3, $sql);
-    $dbh->do($sql)
-      or croak _tr(q[Can't change columns in table <%s> (%s)], $table,
-        $dbh->errstr);
-    return;
-}
-
-1;