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use strict;
use XML::Simple;
my $packagesFile = shift @ARGV;
my $urlPrefix = shift @ARGV;
my @toplevelPkgs = @ARGV;
my @archs = split ' ', ($ENV{'archs'} or "");
print STDERR "parsing packages...\n";
my $xml = XMLin($packagesFile, ForceArray => ['package', 'rpm:entry', 'file'], KeyAttr => []) or die;
print STDERR "file contains $xml->{packages} packages\n";
my %pkgs;
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}}) {
print STDERR "WARNING: duplicate occurrence of package $pkg->{name}\n";
next;
}
$pkgs{$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'} or die;
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};
die if $pkg->{checksum}->{type} ne "sha";
print " (fetchurl {\n";
print " url = $urlPrefix/$pkg->{location}->{href};\n";
print " sha1 = \"$pkg->{checksum}->{content}\";\n";
print " })\n";
print "\n";
}
print "]\n";
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