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https://github.com/privatevoid-net/nix-super.git
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e4d4969ae9
useful way to transfer the closure of a store path to another machine. These commands provide functionality previously possible through `nix-push --copy'. However, they are much more convenient in many situations (though possibly less efficient). Example: $ nix-pack-closure /nix/store/hj232g1r...-subversion-1.3.0 > svn.closure (on another machine:) $ nix-unpack-closure < svn.closure Note that Subversion is added to the store, but not installed into a user environment. One should do `nix-env -i /nix/store/hj232g1r...-subversion-1.3.0' for that. Another example: copy the application Azureus to the machine `scratchy' through ssh: $ nix-pack-closure $(which azureus) | ssh scratchy nix-unpack-closure
81 lines
2.1 KiB
Text
81 lines
2.1 KiB
Text
#! @perl@ -w
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# This tool unpacks the closures created by "nix-pack-closure" and
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# adds them to the Nix store.
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# TODO: make this program "streamy", i.e., don't use a temporary
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# directory.
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use strict;
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use POSIX qw(tmpnam);
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my $binDir = $ENV{"NIX_BIN_DIR"};
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$binDir = "@bindir@" unless defined $binDir;
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my $tmpDir;
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do { $tmpDir = tmpnam(); }
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until mkdir $tmpDir, 0777;
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END { system "rm -rf '$tmpDir'"; }
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# Unpack the NAR archive on standard input.
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system("nix-store --restore '$tmpDir/unpacked'") == 0
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or die "nix-store --restore failed";
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open VALID, ">$tmpDir/validity" or die;
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# For each path in the closure that is not yet valid, add it to the
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# store. TODO: use proper locking. Or even better, let nix-store do
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# this.
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opendir(DIR, "$tmpDir/unpacked/contents") or die "cannot open directory: $!";
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foreach my $name (sort(readdir DIR)) {
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next if $name eq "." or $name eq "..";
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my $storePath = "/nix/store/$name"; # !!!
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# !!! this really isn't a good validity check!
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system "/nix/bin/nix-store --check-validity '$storePath' 2> /dev/null";
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if ($? != 0) {
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print STDERR "unpacking `$storePath'...\n";
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# !!! race
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system("rm -rf '$storePath'") == 0
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or die "cannot remove `$storePath': $?";
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system("$binDir/nix-store --restore '$storePath' < '$tmpDir/unpacked/contents/$name'") == 0
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or die "nix-store --dump failed on `$storePath': $?";
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print VALID "$storePath\n";
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open DRV, "<$tmpDir/unpacked/derivers/$name" or die;
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my $deriver = <DRV>;
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chomp $deriver;
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$deriver = "" if $deriver eq "unknown-deriver";
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close DRV;
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my @refs;
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open REFS, "<$tmpDir/unpacked/references/$name" or die;
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while (<REFS>) {
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chomp;
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push @refs, $_;
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}
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close REFS;
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print VALID "$deriver\n";
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print VALID (scalar @refs), "\n";
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foreach my $ref (@refs) {
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print VALID "$ref\n";
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}
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}
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}
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closedir(DIR) or die;
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# Register the invalid paths as valid.
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system("nix-store --register-validity <'$tmpDir/validity'") == 0
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or die "nix-store --register-validity failed";
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