98 lines
2.8 KiB
Perl
98 lines
2.8 KiB
Perl
#! @perl@ -w
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use strict;
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use File::Basename;
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use IO::Handle;
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my $binDir = $ENV{"NIX_BIN_DIR"} || "@bindir@";
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STDOUT->autoflush(1);
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my @remoteStoresAll = split ':', ($ENV{"NIX_OTHER_STORES"} or "");
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my @remoteStores;
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foreach my $dir (@remoteStoresAll) {
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push @remoteStores, glob($dir);
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}
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sub findStorePath {
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my $storePath = shift;
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my $storePathName = basename $storePath;
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foreach my $store (@remoteStores) {
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# Determine whether $storePath exists by looking for the
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# existence of the info file, and if so, get store path info
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# from that file. This rather breaks abstraction: we should
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# be using `nix-store' for that. But right now there is no
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# good way to tell nix-store to access a store mounted under a
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# different location (there's $NIX_STORE, but that only works
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# if the remote store is mounted under its "real" location).
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my $infoFile = "$store/var/nix/db/info/$storePathName";
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my $storePath2 = "$store/store/$storePathName";
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if (-f $infoFile && -e $storePath2) {
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return ($infoFile, $storePath2);
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}
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}
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}
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if ($ARGV[0] eq "--query") {
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while (<STDIN>) {
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my $cmd = $_; chomp $cmd;
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if ($cmd eq "have") {
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my $storePath = <STDIN>; chomp $storePath;
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(my $infoFile) = findStorePath $storePath;
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print STDOUT ($infoFile ? "1\n" : "0\n");
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}
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elsif ($cmd eq "info") {
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my $storePath = <STDIN>; chomp $storePath;
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(my $infoFile) = findStorePath $storePath;
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if (!$infoFile) {
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print "0\n";
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next; # not an error
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}
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print "1\n";
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my $deriver = "";
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my @references = ();
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open INFO, "<$infoFile" or die "cannot read info file $infoFile\n";
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while (<INFO>) {
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chomp;
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/^([\w-]+): (.*)$/ or die "bad info file";
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my $key = $1;
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my $value = $2;
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if ($key eq "Deriver") { $deriver = $value; }
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elsif ($key eq "References") { @references = split ' ', $value; }
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}
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close INFO;
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print "$deriver\n";
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print scalar @references, "\n";
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print "$_\n" foreach @references;
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print "0\n"; # !!! showing size not supported (yet)
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}
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else { die "unknown command `$cmd'"; }
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}
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}
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elsif ($ARGV[0] eq "--substitute") {
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die unless scalar @ARGV == 2;
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my $storePath = $ARGV[1];
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(my $infoFile, my $sourcePath) = findStorePath $storePath;
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die unless $infoFile;
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print "\n*** Copying `$storePath' from `$sourcePath'\n\n";
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system("$binDir/nix-store --dump $sourcePath | $binDir/nix-store --restore $storePath") == 0
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or die "cannot copy `$sourcePath' to `$storePath'";
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}
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else { die; }
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