nixpkgs/pkgs/build-support/vm/rpm/rpm-closure.pl

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use strict;
use XML::Simple;
use List::Util qw(min);
my @packagesFiles = ();
my @urlPrefixes = ();
# rpm-closure.pl (<package-file> <url-prefix>)+ <toplevel-pkg>+
while(-f $ARGV[0]) {
my $packagesFile = shift @ARGV;
my $urlPrefix = shift @ARGV;
push(@packagesFiles, $packagesFile);
push(@urlPrefixes, $urlPrefix);
}
sub rpmvercmp {
my ($version1, $version2) = @_;
my @vercmps1 = split /\./, $version1;
my @vercmps2 = split /\./, $version2;
my $l1 = scalar(@vercmps1);
my $l2 = scalar(@vercmps2);
my $l = min($l1, $l2);
for(my $i=0; $i<$l; $i++) {
my $v1 = $vercmps1[$i];
my $v2 = $vercmps2[$i];
if($v1 =~ /^[0-9]*$/ && $v2 =~ /^[0-9]*$/) {
if ( int($v1) > int($v2) ) {
return 1;
}
elsif ( int($v1) < int($v2) ) {
return -1;
}
} else {
if ( $v1 gt $v2 ) {
return 1;
}
elsif ( $v1 lt $v2 ) {
return -1;
}
}
}
if($l1 == $l2) {
return 0;
} elsif ($l1 > $l2) {
return 1;
} elsif ($l1 < $l2) {
return -1;
}
}
my @toplevelPkgs = @ARGV;
my @archs = split ' ', ($ENV{'archs'} or "");
my %pkgs;
for (my $i = 0; $i < scalar(@packagesFiles); $i++) {
my $packagesFile = $packagesFiles[$i];
print STDERR "parsing packages in $packagesFile...\n";
my $xml = XMLin($packagesFile, ForceArray => ['package', 'rpm:entry', 'file'], KeyAttr => []) or die;
print STDERR "$packagesFile contains $xml->{packages} packages\n";
foreach my $pkg (@{$xml->{'package'}}) {
if (scalar @archs > 0) {
my $arch = $pkg->{arch};
my $found = 0;
foreach my $a (@archs) { $found = 1 if $arch eq $a; }
next if !$found;
}
if (defined $pkgs{$pkg->{name}}) {
my $earlierPkg = $pkgs{$pkg->{name}};
print STDERR "WARNING: duplicate occurrence of package $pkg->{name}\n";
# <version epoch="0" ver="1.28.0" rel="2.el6"/>
my $cmp = rpmvercmp($pkg->{'version'}->{ver}, $earlierPkg->{'version'}->{ver});
if ($cmp > 0 || ($cmp == 0 && rpmvercmp($pkg->{'version'}->{rel}, $earlierPkg->{'version'}->{rel})>0)) {
print STDERR "WARNING: replaced package $pkg->{name} (".$earlierPkg->{'version'}->{ver}." ".$earlierPkg->{'version'}->{rel}.") with newer one (".$pkg->{'version'}->{ver}." ".$pkg->{'version'}->{rel}.")\n";
$pkg->{urlPrefix} = $urlPrefixes[$i];
$pkgs{$pkg->{name}} = $pkg;
}
next;
}
$pkg->{urlPrefix} = $urlPrefixes[$i];
$pkgs{$pkg->{name}} = $pkg;
}
}
my %provides;
foreach my $pkgName (keys %pkgs) {
print STDERR "looking at $pkgName\n";
my $pkg = $pkgs{$pkgName};
#print STDERR keys %{$pkg->{format}}, "\n";
#print STDERR $pkg->{format}->{'rpm:provides'}, "\n";
my $provides = $pkg->{format}->{'rpm:provides'}->{'rpm:entry'} or die;
foreach my $req (@{$provides}) {
#print "$req->{name}\n";
#print STDERR " provides $req\n";
#die "multiple provides for $req" if defined $provides{$req};
$provides{$req->{name}} = $pkgName;
}
if (defined $pkg->{format}->{file}) {
foreach my $file (@{$pkg->{format}->{file}}) {
#print STDERR " provides file $file\n";
$provides{$file} = $pkgName;
}
}
}
my %donePkgs;
my @needed = ();
sub closePackage {
my $pkgName = shift;
return if defined $donePkgs{$pkgName};
$donePkgs{$pkgName} = 1;
print STDERR ">>> $pkgName\n";
my $pkg = $pkgs{$pkgName} or die "package $pkgName doesn't exist";
my $requires = $pkg->{format}->{'rpm:requires'}->{'rpm:entry'} || [];
my @deps = ();
foreach my $req (@{$requires}) {
next if $req->{name} =~ /^rpmlib\(/;
print STDERR " needs $req->{name}\n";
my $provider = $provides{$req->{name}};
if (!defined $provider) {
print STDERR " WARNING: no provider for $req->{name}\n";
next;
}
print STDERR " satisfied by $provider\n";
push @deps, $provider;
}
closePackage($_) foreach @deps;
push @needed, $pkgName;
}
foreach my $pkgName (@toplevelPkgs) {
closePackage $pkgName;
}
# Generate the output Nix expression.
print "# This is a generated file. Do not modify!\n";
print "# Following are the RPM packages constituting the closure of: @toplevelPkgs\n\n";
print "{fetchurl}:\n\n";
print "[\n\n";
foreach my $pkgName (@needed) {
my $pkg = $pkgs{$pkgName};
print " (fetchurl {\n";
print " url = $pkg->{urlPrefix}/$pkg->{location}->{href};\n";
if ($pkg->{checksum}->{type} eq "sha") {
print " sha1 = \"$pkg->{checksum}->{content}\";\n";
} elsif ($pkg->{checksum}->{type} eq "sha256") {
print " sha256 = \"$pkg->{checksum}->{content}\";\n";
} else {
die "unsupported hash type";
}
print " })\n";
print "\n";
}
print "]\n";