mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-10 16:26:18 +02:00
109 lines
2.7 KiB
Perl
109 lines
2.7 KiB
Perl
#! /usr/bin/perl -w -I@libexecdir@/nix
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use strict;
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use IPC::Open2;
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use POSIX qw(tmpnam);
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use readmanifest;
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my $tmpdir;
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do { $tmpdir = tmpnam(); }
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until mkdir $tmpdir, 0777;
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my $manifest = "$tmpdir/manifest";
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my $conffile = "@sysconfdir@/nix/prebuilts.conf";
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#END { unlink $manifest; rmdir $tmpdir; }
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# Obtain URLs either from the command line or from a configuration file.
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my %storepaths2urls;
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my %urls2hashes;
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my %successors;
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sub doURL {
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my $url = shift;
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processURL $manifest, $url, \%storepaths2urls, \%urls2hashes, \%successors;
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}
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if (scalar @ARGV > 0) {
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while (@ARGV) {
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my $url = shift @ARGV;
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doURL $url;
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}
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} else {
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open CONFFILE, "<$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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doURL $url;
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}
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}
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close CONFFILE;
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}
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# Create a Nix expression for the substitutes.
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my $fullexpr = "[";
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my @storepaths;
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foreach my $storepath (keys %storepaths2urls) {
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# Construct a Nix expression that fetches and unpacks a
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# Nix archive from the network.
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my $url = $storepaths2urls{$storepath};
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my $hash = $urls2hashes{$url};
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my $fetch =
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"(import @datadir@/nix/corepkgs/fetchurl) " .
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"{url = $url; md5 = \"$hash\"; system = \"@system@\";}";
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my $nixexpr =
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"((import @datadir@/nix/corepkgs/nar/unnar.nix) " .
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"{narFile = ($fetch); outPath = \"$storepath\"; system = \"@system@\";}) ";
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$fullexpr .= $nixexpr; # !!! O(n^2)?
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push @storepaths, $storepath;
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}
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$fullexpr .= "]";
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# Instantiate store expressions from the Nix expressions we created above.
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print STDERR "instantiating store expressions...\n";
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my $pid = open2(\*READ, \*WRITE, "nix-instantiate -") or die "cannot run nix-instantiate";
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print WRITE $fullexpr;
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close WRITE;
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my $i = 0;
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my %substitutes;
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while (<READ>) {
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chomp;
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die unless /^\//;
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my $subpath = $_;
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die unless ($i < scalar @storepaths);
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$substitutes{$storepaths[$i++]} = $subpath;
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}
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waitpid $pid, 0;
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$? == 0 or die "nix-instantiate failed";
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# Register all substitutes.
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print STDERR "registering substitutes...\n";
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my @subs = %substitutes;
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while (scalar @subs > 0) {
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my $n = scalar @subs;
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if ($n > 256) { $n = 256 };
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my @subs2 = @subs[0..$n - 1];
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@subs = @subs[$n..scalar @subs - 1];
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system "nix-store --substitute @subs2";
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if ($?) { die "`nix-store --substitute' failed"; }
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}
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# Register all successors.
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print STDERR "registering successors...\n";
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my @sucs = %successors;
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while (scalar @sucs > 0) {
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my $n = scalar @sucs;
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if ($n > 256) { $n = 256 };
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my @sucs2 = @sucs[0..$n - 1];
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@sucs = @sucs[$n..scalar @sucs - 1];
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system "nix-store --successor @sucs2";
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if ($?) { die "`nix-store --successor' failed"; }
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}
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