forked from lix-project/lix
115 lines
2.9 KiB
Perl
115 lines
2.9 KiB
Perl
#! /usr/bin/perl -w
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use strict;
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use IPC::Open2;
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my $tmpfile = "@localstatedir@/nix/pull.tmp";
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my $conffile = "@sysconfdir@/nix/prebuilts.conf";
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my @ids;
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my @subs;
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my @sucs;
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my $fullexpr = "[";
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my $first = 1;
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open CONFFILE, "<$conffile";
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while (<CONFFILE>) {
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chomp;
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if (/^\s*(\S+)\s*(\#.*)?$/) {
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my $url = $1;
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print "obtaining list of Nix archives at $url...\n";
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system "wget '$url' -O '$tmpfile' 2> /dev/null"; # !!! escape
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if ($?) { die "`wget' failed"; }
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open INDEX, "<$tmpfile";
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while (<INDEX>) {
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# Get all links to prebuilts, that is, file names of the
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# form foo-HASH-HASH.tar.bz2.
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next unless (/HREF=\"([^\"]*)\"/);
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my $fn = $1;
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next if $fn =~ /\.\./;
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next if $fn =~ /\//;
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next unless $fn =~ /^([0-9a-z]{32})-([0-9a-z]{32})(.*)\.nar\.bz2$/;
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my $hash = $1;
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my $id = $2;
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my $outname = $3;
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my $fsid;
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if ($outname =~ /^-/) {
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next unless $outname =~ /^-((s-([0-9a-z]{32}))?.*)$/;
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$outname = $1;
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$fsid = $3;
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} else {
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$outname = "unnamed";
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}
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print STDERR "$id ($outname)\n";
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# Construct a Fix expression that fetches and unpacks a
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# Nix archive from the network.
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my $fetch =
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"App(IncludeFix(\"fetchurl/fetchurl.fix\"), " .
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"[(\"url\", \"$url/$fn\"), (\"md5\", \"$hash\")])";
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my $fixexpr =
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"App(IncludeFix(\"nar/unnar.fix\"), " .
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"[ (\"nar\", $fetch)" .
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", (\"name\", \"$outname\")" .
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", (\"id\", \"$id\")" .
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"])";
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if (!$first) { $fullexpr .= "," };
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$first = 0;
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$fullexpr .= $fixexpr; # !!! O(n^2)?
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push @ids, $id;
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# Does the name encode a successor relation?
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if (defined $fsid) {
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push @sucs, $fsid;
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push @sucs, $id;
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}
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}
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close INDEX;
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unlink $tmpfile;
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}
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}
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$fullexpr .= "]";
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# Instantiate Nix expressions from the Fix expressions we created above.
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print STDERR "running fix...\n";
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my $pid = open2(\*READ, \*WRITE, "fix -") or die "cannot run fix";
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print WRITE $fullexpr;
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close WRITE;
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my $i = 0;
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while (<READ>) {
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chomp;
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die unless /^([0-9a-z]{32})$/;
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my $nid = $1;
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die unless ($i < scalar @ids);
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my $id = $ids[$i++];
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push @subs, $id;
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push @subs, $nid;
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}
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waitpid $pid, 0;
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$? == 0 or die "fix failed";
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# Register all substitutes.
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print STDERR "registering substitutes...\n";
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system "nix --substitute @subs";
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if ($?) { die "`nix --substitute' failed"; }
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# Register all successors.
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print STDERR "registering successors...\n";
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system "nix --successor @sucs";
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if ($?) { die "`nix --successor' failed"; }
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