tvl-depot/perl/lib/Nix/CopyClosure.pm
Eelco Dolstra 5bbd693cae * Add an API function exportPaths() that provides the functionality of
‘nix-store --export’.
* Add a Perl module that provides the functionality of
  ‘nix-copy-closure --to’.  This is used by build-remote.pl so it no
  longer needs to start a separate nix-copy-closure process.  Also, it
  uses the Perl API to do the export, so it doesn't need to start a
  separate nix-store process either.  As a result, nix-copy-closure
  and build-remote.pl should no longer fail on very large closures due
  to an "Argument list too long" error.  (Note that having very many
  dependencies in a single derivation can still fail because the
  environment can become too large.  Can't be helped though.)
2011-11-23 15:13:37 +00:00

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package Nix::CopyClosure;
use strict;
use Nix::Config;
use Nix::Store;
sub copyTo {
my ($sshHost, $sshOpts, $storePaths, $compressor, $decompressor, $includeOutputs, $dryRun, $sign) = @_;
$compressor = "$compressor |" if $compressor ne "";
$decompressor = "$decompressor |" if $decompressor ne "";
# Get the closure of this path.
my @closure = reverse(topoSortPaths(computeFSClosure(0, $includeOutputs,
map { followLinksToStorePath $_ } @{$storePaths})));
# Ask the remote host which paths are invalid. Because of limits
# to the command line length, do this in chunks. Eventually,
# we'll want to use --from-stdin, but we can't rely on the
# target having this option yet.
my @missing = ();
while (scalar(@closure) > 0) {
my @ps = splice(@closure, 0, 1500);
open(READ, "set -f; ssh $sshHost @{$sshOpts} nix-store --check-validity --print-invalid @ps|");
while (<READ>) {
chomp;
push @missing, $_;
}
close READ or die;
}
# Export the store paths and import them on the remote machine.
if (scalar @missing > 0) {
print STDERR "copying ", scalar @missing, " missing paths to $sshHost...\n";
#print STDERR " $_\n" foreach @missing;
unless ($dryRun) {
open SSH, "| $compressor ssh $sshHost @{$sshOpts} '$decompressor nix-store --import'" or die;
exportPaths(fileno(SSH), $sign, @missing);
close SSH or die "copying store paths to remote machine `$sshHost' failed: $?";
}
}
}
1;