73 lines
1.7 KiB
Perl
73 lines
1.7 KiB
Perl
#! /usr/bin/perl -w
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my $prefix = $ENV{"NIX"} || "/tmp/nix"; # !!! use prefix
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my $etcdir = "$prefix/etc/nix";
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my $tmpfile = "$prefix/var/nix/pull.tmp";
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my $conffile = "$etcdir/prebuilts.conf";
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my @subs;
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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/;
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my $hash = $2;
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print "registering $hash -> $url/$fn\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\"), (\"hash\", \"\")])";
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my $fixexpr =
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"App(IncludeFix(\"nar/unnar.fix\"), " .
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"[ (\"nar\", $fetch)" .
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", (\"name\", \"fetched-$hash\")" .
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"])";
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my $fixfile = "/tmp/nix-pull-tmp.fix";
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open FIX, ">$fixfile";
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print FIX $fixexpr;
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close FIX;
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# Instantiate a Nix expression from the Fix expression.
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my $nhash = `fix $fixfile`;
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$? and die "instantiating Nix archive expression";
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chomp $nhash;
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die unless $nhash =~ /^([0-9a-z]{32})$/;
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push @subs, $hash;
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push @subs, $nhash;
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}
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close INDEX;
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unlink $tmpfile;
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}
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}
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system "nix --substitute @subs";
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if ($?) { die "`nix --substitute' failed"; }
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