119 lines
3.1 KiB
Perl
119 lines
3.1 KiB
Perl
use strict;
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use XML::Simple;
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my $packagesFile = shift @ARGV;
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my $urlPrefix = shift @ARGV;
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my @toplevelPkgs = @ARGV;
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my @archs = split ' ', ($ENV{'archs'} or "");
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print STDERR "parsing packages...\n";
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my $xml = XMLin($packagesFile, ForceArray => ['package', 'rpm:entry', 'file'], KeyAttr => []) or die;
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print STDERR "file contains $xml->{packages} packages\n";
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my %pkgs;
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foreach my $pkg (@{$xml->{'package'}}) {
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if (scalar @archs > 0) {
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my $arch = $pkg->{arch};
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my $found = 0;
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foreach my $a (@archs) { $found = 1 if $arch eq $a; }
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next if !$found;
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}
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if (defined $pkgs{$pkg->{name}}) {
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print STDERR "WARNING: duplicate occurrence of package $pkg->{name}\n";
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next;
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}
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$pkgs{$pkg->{name}} = $pkg;
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}
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my %provides;
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foreach my $pkgName (keys %pkgs) {
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print STDERR "looking at $pkgName\n";
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my $pkg = $pkgs{$pkgName};
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#print STDERR keys %{$pkg->{format}}, "\n";
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#print STDERR $pkg->{format}->{'rpm:provides'}, "\n";
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my $provides = $pkg->{format}->{'rpm:provides'}->{'rpm:entry'} or die;
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foreach my $req (@{$provides}) {
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#print "$req->{name}\n";
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#print STDERR " provides $req\n";
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#die "multiple provides for $req" if defined $provides{$req};
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$provides{$req->{name}} = $pkgName;
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}
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if (defined $pkg->{format}->{file}) {
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foreach my $file (@{$pkg->{format}->{file}}) {
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#print STDERR " provides file $file\n";
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$provides{$file} = $pkgName;
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}
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}
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}
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my %donePkgs;
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my @needed = ();
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sub closePackage {
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my $pkgName = shift;
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return if defined $donePkgs{$pkgName};
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$donePkgs{$pkgName} = 1;
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print STDERR ">>> $pkgName\n";
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my $pkg = $pkgs{$pkgName} or die "package $pkgName doesn't exist";
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my $requires = $pkg->{format}->{'rpm:requires'}->{'rpm:entry'} || [];
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my @deps = ();
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foreach my $req (@{$requires}) {
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next if $req->{name} =~ /^rpmlib\(/;
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print STDERR " needs $req->{name}\n";
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my $provider = $provides{$req->{name}};
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if (!defined $provider) {
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print STDERR " WARNING: no provider for $req->{name}\n";
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next;
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}
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print STDERR " satisfied by $provider\n";
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push @deps, $provider;
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}
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closePackage($_) foreach @deps;
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push @needed, $pkgName;
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}
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foreach my $pkgName (@toplevelPkgs) {
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closePackage $pkgName;
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}
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# Generate the output Nix expression.
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print "# This is a generated file. Do not modify!\n";
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print "# Following are the RPM packages constituting the closure of: @toplevelPkgs\n\n";
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print "{fetchurl}:\n\n";
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print "[\n\n";
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foreach my $pkgName (@needed) {
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my $pkg = $pkgs{$pkgName};
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print " (fetchurl {\n";
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print " url = $urlPrefix/$pkg->{location}->{href};\n";
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if ($pkg->{checksum}->{type} eq "sha") {
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print " sha1 = \"$pkg->{checksum}->{content}\";\n";
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} elsif ($pkg->{checksum}->{type} eq "sha256") {
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print " sha256 = \"$pkg->{checksum}->{content}\";\n";
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} else {
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die "unsupported hash type";
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}
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print " })\n";
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print "\n";
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}
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print "]\n";
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