* added tool for determine the minimum package set, although it seems to work ok,

  yum can't use the resulting set, though (packets seem to be missing).
  I haven't found out yet what causes this.


git-svn-id: http://svn.openslx.org/svn/openslx/trunk@817 95ad53e4-c205-0410-b2fa-d234c58c8868

1 files changed, 177 insertions, 0 deletions

diff --git a/bin/devel-tools/determineMinimumPackageSet.pl b/bin/devel-tools/determineMinimumPackageSet.pl
new file mode 100755
index 00000000..f79d2e7d
--- /dev/null
+++ b/bin/devel-tools/determineMinimumPackageSet.pl
@@ -0,0 +1,177 @@
+#! /usr/bin/perl
+# -----------------------------------------------------------------------------
+# 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/
+# -----------------------------------------------------------------------------
+use strict;
+
+my $abstract = q[
+determineMinimumPackageSet.pl
+    This script is a tool for OpenSLX developers that allows to extract
+    the minimal package-set from all the installed rpm packages.
+    "Minimum" here means those packages only that are not
+    required by other installed packages (a.k.a. the leaves of the RPM
+    dependency graph).
+    This minimal set is useful to simplify the commandline for yum when
+    it is invoked to install a specific selection.
+];
+
+use Getopt::Long;
+use Pod::Usage;
+
+my (
+	$helpReq,
+	$verbose,
+	$versionReq,
+
+	%pkgs,
+	@leafPkgs,
+);
+
+my $rpmOutFile = "/tmp/minpkgset.rpmout";
+my $rpmErrFile = "/tmp/minpkgset.rpmerr";
+
+GetOptions(
+	'help|?' => \$helpReq,
+	'verbose' => \$verbose,
+	'version' => \$versionReq,
+) or pod2usage(2);
+pod2usage(-msg => $abstract, -verbose => 0, -exitval => 1) if $helpReq;
+if ($versionReq) {
+	system('slxversion');
+	exit 1;
+}
+
+determineMinimumPackageSet();
+
+print "THE MINIMUM PACKAGE LIST:\n";
+print ('-' x 40)."\n";
+print join("\n", sort @leafPkgs)."\n";
+
+exit;
+
+sub slurpFile
+{
+	my $file = shift;
+
+	if (!open(F, "< $file")) {
+		die _tr("could not open file '%s' for reading! (%s)", $file, $!);
+	}
+	local $/ = undef;
+	my $text = <F>;
+	close(F);
+	return $text;
+}
+
+sub rpmDie
+{
+	my $rpmCmd = shift;
+
+	print "\n*** An error occurred when executing the following rpm-command:\n";
+	print "\t$rpmCmd\n";
+	my $err = slurpFile($rpmErrFile);
+	print "*** The error was:\n";
+	print "\t$err\n";
+	exit 5;
+}
+
+sub callRpm
+{
+	my $rpmCmd = shift;
+
+	my $res	= system("$rpmCmd >$rpmOutFile 2>$rpmErrFile");
+	exit 1 if ($res & 127);		# child caught a signal
+	rpmDie($rpmCmd) if -s $rpmErrFile;
+	my $out = slurpFile($rpmOutFile);
+	return ($res, $out);
+}
+
+sub handlePackage
+{
+	my $pkgName = shift;
+
+	# if any other package requires it, the current package is not a leaf!
+	print "\tdirectly required..." 		if $verbose;
+	my ($rpmRes, $rpmOut) = callRpm(qq[rpm -q --whatrequires "$pkgName"]);
+	print $rpmRes ? "no\n" : "yes\n" 		if $verbose;
+	return 0 unless $rpmRes;
+
+	print "\tany of its provides required..." 		if $verbose;
+	($rpmRes, $rpmOut) = callRpm(qq[rpm -q --provides "$pkgName"]);
+	my $provides
+		=	join ' ',
+			map { s[^\s*(.+?)\s*$][$1]; qq["$_"]; }
+			split "\n", $rpmOut;
+	($rpmRes, $rpmOut) = callRpm(qq[rpm -q --whatrequires $provides]);
+	if ($rpmRes == 0) {
+		# ignore if rpm tells us that a provides is required by
+		# the package that provides it:
+		$rpmRes = 1;
+		while($rpmOut =~ m[^\s*(.+?)\s*]gm) {
+			if ($1 ne $pkgName) {
+				$rpmRes = 0;
+				last;
+			}
+		}
+	}
+	print $rpmRes ? "no\n" : "yes\n" 		if $verbose;
+	return 0 unless $rpmRes;
+
+	print "!!! adding $pkgName\n"		if $verbose;
+	push @leafPkgs, $pkgName;
+	return 1;
+}
+
+sub determineMinimumPackageSet
+{
+	my ($rpmRes, $allPkgs)
+		= callRpm(qq[rpm -qa --queryformat "%{NAME}\n"]);
+	foreach my $p (sort split "\n", $allPkgs) {
+		print "$p...\n" 		if $verbose;
+		print "."		unless $verbose;
+		handlePackage($p);
+	}
+}
+
+__END__
+
+=head1 NAME
+
+determineMinimumPackageSet.pl - OpenSLX script to extract the minimum package
+set from all the installed rpm packages.
+
+=head1 SYNOPSIS
+
+determineMinimumPackageSet.pl [options]
+
+  Options:
+      --help                   brief help message
+      --verbose                show files as they are being processed
+      --version                show version
+
+=head1 OPTIONS
+
+=over 8
+
+=item B<--help>
+
+Prints a brief help message and exits.
+
+=item B<--verbose>
+
+Prints information about each installed package as it is being processed.
+
+=item B<--version>
+
+Prints the version and exits.
+
+=back
+
+=cut
\ No newline at end of file