forked from lix-project/lix
15f39aba8c
stores (typically remote Nix stores mounted via e.g. NFS, or the Nix
store on the NixOS installation CD). Example use:
$ sshfs foo@example.org:/ /mnt
$ NIX_OTHER_STORES=/mnt/nix \
NIX_SUBSTITUTERS=.../copy-from-other-stores.pl \
nix-env -i foo
This will be especially useful for the installation CD since it
doesn't require a manifest for the CD contents.
83 lines
2.4 KiB
Perl
83 lines
2.4 KiB
Perl
#! @perl@ -w
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use strict;
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use File::Basename;
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#print STDERR "FOO: @ARGV\n";
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die unless defined $ENV{"NIX_OTHER_STORES"};
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my @remoteStores = split ':', $ENV{"NIX_OTHER_STORES"};
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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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#print STDERR "GET $storePath\n";
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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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#print STDERR "FOUND IN $infoFile\n";
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return ($infoFile, $storePath2);
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}
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}
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}
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if ($ARGV[0] eq "--query-paths") {
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# !!! not implemented yet; needed for `nix-env -qas'
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}
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elsif ($ARGV[0] eq "--query-info") {
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shift @ARGV;
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foreach my $storePath (@ARGV) {
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(my $infoFile) = findStorePath $storePath;
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#print STDERR "XXX $infoFile\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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#print STDERR "GOT $_\n";
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/^([\w-]+): (.*)$/ 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 ' ', $value; }
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}
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close INFO;
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print "$storePath\n";
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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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}
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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 $storePath;
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print "\n*** Copying `$storePath' from `$sourcePath'\n\n";
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system("nix-store --dump $sourcePath | 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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