From 47f371f8567e1a9f4a0b9937393e38a1f42100d0 Mon Sep 17 00:00:00 2001 From: Oliver Tappe Date: Tue, 22 Jan 2008 19:58:20 +0000 Subject: * moved functionality of slxldd into a module (LibScanner), such that it can be used by other programs, too * slxldd is now just a wrapper for the LibScanner module git-svn-id: http://svn.openslx.org/svn/openslx/trunk@1483 95ad53e4-c205-0410-b2fa-d234c58c8868 --- initramfs/OpenSLX/LibScanner.pm | 262 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 262 insertions(+) create mode 100644 initramfs/OpenSLX/LibScanner.pm (limited to 'initramfs') diff --git a/initramfs/OpenSLX/LibScanner.pm b/initramfs/OpenSLX/LibScanner.pm new file mode 100644 index 00000000..c5cef34a --- /dev/null +++ b/initramfs/OpenSLX/LibScanner.pm @@ -0,0 +1,262 @@ +# Copyright (c) 2006-2008 - 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/ +# ----------------------------------------------------------------------------- +# LibScanner.pm +# - module that recursively scans a given binary for library dependencies +# ----------------------------------------------------------------------------- +package OpenSLX::LibScanner; + +use strict; +use warnings; + +use File::Find; +use File::Path; + +use OpenSLX::Basics; +use OpenSLX::Utils; + +################################################################################ +### interface methods +################################################################################ +sub new +{ + my $class = shift; + my $params = shift || {}; + + checkParams($params, { + 'root-path' => '!', + 'verbose' => '?', + } ); + + my $self = { + rootPath => $params->{'root-path'}, + verbose => $params->{'verbose'} || 0, + }; + + return bless $self, $class; +} + +sub determineRequiredLibs +{ + my $self = shift; + my @binaries = @_; + + $self->{filesToDo} = []; + $self->{libs} = []; + $self->{libInfo} = {}; + + $self->_fetchLoaderConfig(); + + foreach my $binary (@binaries) { + if (substr($binary, 0, 1) ne '/') { + # force relative paths relative to $rootPath: + $binary = "$self->{rootPath}/$binary"; + } + if (!-e $binary) { + warn _tr("$0: unable to find file '%s', skipping it\n", $binary); + next; + } + push @{$self->{filesToDo}}, $binary; + } + + foreach my $file (@{$self->{filesToDo}}) { + $self->_addLibsForBinary($file); + } + + return @{$self->{libs}}; +} + +sub _fetchLoaderConfig +{ + my $self = shift; + + my @libFolders; + + if (!-e "$self->{rootPath}/etc") { + die _tr("'%s'-folder not found, maybe wrong root-path?\n", + "$self->{rootPath}/etc"); + } + $self->_fetchLoaderConfigFile("$self->{rootPath}/etc/ld.so.conf"); + + # add "trusted" folders /lib and /usr/lib if not already in place: + if (!grep { m[^$self->{rootPath}/lib$] } @libFolders) { + push @libFolders, "$self->{rootPath}/lib"; + } + if (!grep { m[^$self->{rootPath}/usr/lib$] } @libFolders) { + push @libFolders, "$self->{rootPath}/usr/lib"; + } + + # add lib32-folders for 64-bit Debians, as they do not + # refer those in ld.so.conf (which I find strange...) + if (-e '/lib32' && !grep { m[^$self->{rootPath}/lib32$] } @libFolders) { + push @libFolders, "$self->{rootPath}/lib32"; + } + if (-e '/usr/lib32' + && !grep { m[^$self->{rootPath}/usr/lib32$] } @libFolders) + { + push @libFolders, "$self->{rootPath}/usr/lib32"; + } + + $self->{libFolders} = \@libFolders; + + return; +} + +sub _fetchLoaderConfigFile +{ + my $self = shift; + my $ldConfFile = shift; + + return unless -e $ldConfFile; + my $ldconfFH; + if (!open($ldconfFH, '<', $ldConfFile)) { + warn(_tr("unable to open file '%s' (%s)", $ldConfFile, $!)); + return; + } + while (<$ldconfFH>) { + chomp; + if (m{^\s*include\s+(.+?)\s*$}i) { + my @incFiles = glob("$self->{rootPath}$1"); + foreach my $incFile (@incFiles) { + if ($incFile) { + $self->_fetchLoaderConfigFile($incFile); + } + } + next; + } + if (m{\S+}i) { + s[=.+][]; + # remove any lib-type specifications (e.g. '=libc5') + push @{$self->{libFolders}}, "$self->{rootPath}$_"; + } + } + close $ldconfFH + or die(_tr("unable to close file '%s' (%s)", $ldConfFile, $!)); + return; +} + +sub _addLibsForBinary +{ + my $self = shift; + my $binary = shift; + + # first do some checks: + warn _tr("analyzing '%s'...\n", $binary) if $self->{verbose}; + my $fileInfo = `file --dereference --brief --mime $binary 2>/dev/null`; + if ($?) { + die _tr("unable to fetch file info for '%s', giving up!\n", $binary); + } + chomp $fileInfo; + warn _tr("\tinfo is: '%s'...\n", $fileInfo) if $self->{verbose}; + if ($fileInfo !~ m[^application/(x-executable|x-shared)]i) { + # ignore anything that's not an executable or a shared library + warn _tr( + "%s: ignored, as it isn't an executable or a shared library\n", + $binary + ); + next; + } + + # fetch file info again, this time without '--mime' in order to get the architecture + # bitwidth: + $fileInfo = `file --dereference --brief $binary 2>/dev/null`; + if ($?) { + die _tr("unable to fetch file info for '%s', giving up!\n", $binary); + } + chomp $fileInfo; + warn _tr("\tinfo is: '%s'...\n", $fileInfo) if $self->{verbose}; + my $bitwidth = ($fileInfo =~ m[64-bit]i) ? 64 : 32; + # determine whether binary is 32- or 64-bit platform + + # now find out about needed libs, we first try objdump... + warn _tr("\ttrying objdump...\n") if $self->{verbose}; + my $res = `objdump -p $binary 2>/dev/null`; + if (!$?) { + # find out if rpath is set for binary: + my $rpath; + if ($res =~ m[^\s*RPATH\s*(\S+)]im) { + $rpath = $1; + warn _tr("\trpath='%s'\n", $rpath) if $self->{verbose}; + } + while ($res =~ m[^\s*NEEDED\s*(.+?)\s*$]gm) { + $self->_addLib($1, $bitwidth, $rpath); + } + } else { + # ...objdump failed, so we try readelf instead: + warn _tr("\ttrying readelf...\n") if $self->{verbose}; + $res = `readelf -d $binary 2>/dev/null`; + if ($?) { + die _tr( + "neither objdump nor readelf seems to be installed, giving up!\n" + ); + } + # find out if rpath is set for binary: + my $rpath; + if ($res =~ m{Library\s*rpath:\s*\[([^\]]+)}im) { + $rpath = $1; + warn _tr("\trpath='%s'\n", $rpath) if $self->{verbose}; + } + while ($res =~ m{\(NEEDED\)[^\[]+\[(.+?)\]\s*$}gm) { + $self->_addLib($1, $bitwidth, $rpath); + } + } + return; +} + +sub _addLib +{ + my $self = shift; + my $lib = shift; + my $bitwidth = shift; + my $rpath = shift; + + if (!exists $self->{libInfo}->{$lib}) { + my $libPath; + my @folders = @{$self->{libFolders}}; + if (defined $rpath) { + # add rpath if given (explicit paths set during link stage) + push @folders, split ':', $rpath; + } + foreach my $folder (@folders) { + if (-e "$folder/$lib") { + # have library matching name, now check if the platform is ok, too: + my $libFileInfo = + `file --dereference --brief $folder/$lib 2>/dev/null`; + if ($?) { + die _tr("unable to fetch file info for '%s', giving up!\n", + $folder / $lib); + } + my $libBitwidth = ($libFileInfo =~ m[64-bit]i) ? 64 : 32; + if ($bitwidth != $libBitwidth) { + vlog( + 0, + _tr( + '%s has wrong bitwidth (%s instead of %s)', + "$folder/$lib", $libBitwidth, $bitwidth + ) + ) if $self->{verbose}; + next; + } + $libPath = "$folder/$lib"; + last; + } + } + if (!defined $libPath) { + die _tr("unable to find lib %s!\n", $lib); + } + print "found $libPath\n" if $self->{verbose}; + push @{$self->{libs}}, $libPath; + $self->{libInfo}->{$lib} = 1; + push @{$self->{filesToDo}}, $libPath; + } + return; +} + +1; -- cgit v1.2.3-55-g7522