5bbd693cae
‘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.)
46 lines
1.6 KiB
Perl
46 lines
1.6 KiB
Perl
package Nix::CopyClosure;
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use strict;
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use Nix::Config;
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use Nix::Store;
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sub copyTo {
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my ($sshHost, $sshOpts, $storePaths, $compressor, $decompressor, $includeOutputs, $dryRun, $sign) = @_;
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$compressor = "$compressor |" if $compressor ne "";
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$decompressor = "$decompressor |" if $decompressor ne "";
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# Get the closure of this path.
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my @closure = reverse(topoSortPaths(computeFSClosure(0, $includeOutputs,
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map { followLinksToStorePath $_ } @{$storePaths})));
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# Ask the remote host which paths are invalid. Because of limits
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# to the command line length, do this in chunks. Eventually,
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# we'll want to use ‘--from-stdin’, but we can't rely on the
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# target having this option yet.
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my @missing = ();
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while (scalar(@closure) > 0) {
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my @ps = splice(@closure, 0, 1500);
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open(READ, "set -f; ssh $sshHost @{$sshOpts} nix-store --check-validity --print-invalid @ps|");
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while (<READ>) {
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chomp;
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push @missing, $_;
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}
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close READ or die;
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}
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# Export the store paths and import them on the remote machine.
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if (scalar @missing > 0) {
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print STDERR "copying ", scalar @missing, " missing paths to ‘$sshHost’...\n";
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#print STDERR " $_\n" foreach @missing;
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unless ($dryRun) {
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open SSH, "| $compressor ssh $sshHost @{$sshOpts} '$decompressor nix-store --import'" or die;
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exportPaths(fileno(SSH), $sign, @missing);
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close SSH or die "copying store paths to remote machine `$sshHost' failed: $?";
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}
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}
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}
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1;
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