115 lines
3.7 KiB
Perl
115 lines
3.7 KiB
Perl
package Nix::CopyClosure;
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use utf8;
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use strict;
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use Nix::Config;
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use Nix::Store;
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use Nix::SSH;
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use List::Util qw(sum);
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use IPC::Open2;
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sub copyToOpen {
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my ($from, $to, $sshHost, $storePaths, $includeOutputs, $dryRun, $useSubstitutes) = @_;
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$useSubstitutes = 0 if $dryRun || !defined $useSubstitutes;
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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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# Send the "query valid paths" command with the "lock" option
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# enabled. This prevents a race where the remote host
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# garbage-collect paths that are already there. Optionally, ask
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# the remote host to substitute missing paths.
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syswrite($to, pack("L<x4L<x4L<x4", 1, 1, $useSubstitutes)) or die;
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writeStrings(\@closure, $to);
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# Get back the set of paths that are already valid on the remote host.
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my %present;
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$present{$_} = 1 foreach readStrings($from);
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my @missing = grep { !$present{$_} } @closure;
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return if !@missing;
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my $missingSize = 0;
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$missingSize += (queryPathInfo($_, 1))[3] foreach @missing;
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printf STDERR "copying %d missing paths (%.2f MiB) to ‘$sshHost’...\n",
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scalar(@missing), $missingSize / (1024**2);
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return if $dryRun;
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# Send the "import paths" command.
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syswrite($to, pack("L<x4", 4)) or die;
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exportPaths(fileno($to), @missing);
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readInt($from) == 1 or die "remote machine ‘$sshHost’ failed to import closure\n";
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}
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sub copyTo {
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my ($sshHost, $storePaths, $includeOutputs, $dryRun, $useSubstitutes) = @_;
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# Connect to the remote host.
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my ($from, $to);
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eval {
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($from, $to) = connectToRemoteNix($sshHost, []);
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};
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if ($@) {
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chomp $@;
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warn "$@; falling back to old closure copying method\n";
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$@ = "";
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return oldCopyTo(@_);
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}
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copyToOpen($from, $to, $sshHost, $storePaths, $includeOutputs, $dryRun, $useSubstitutes);
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close $to;
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}
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# For backwards compatibility with Nix <= 1.7. Will be removed
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# eventually.
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sub oldCopyTo {
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my ($sshHost, $storePaths, $includeOutputs, $dryRun, $useSubstitutes) = @_;
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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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# Optionally use substitutes on the remote host.
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if (!$dryRun && $useSubstitutes) {
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system "ssh $sshHost @globalSshOpts nix-store -r --ignore-unknown @closure";
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# Ignore exit status because this is just an optimisation.
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}
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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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my $missingSize = 0;
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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 @globalSshOpts nix-store --check-validity --print-invalid @ps|");
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while (<READ>) {
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chomp;
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push @missing, $_;
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my ($deriver, $narHash, $time, $narSize, $refs) = queryPathInfo($_, 1);
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$missingSize += $narSize;
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}
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close READ or die;
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}
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# Export the store paths and import them on the remote machine.
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if (scalar @missing > 0) {
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print STDERR "copying ", scalar @missing, " missing paths to ‘$sshHost’...\n";
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unless ($dryRun) {
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open SSH, "| ssh $sshHost @globalSshOpts 'nix-store --import' > /dev/null" or die;
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exportPaths(fileno(SSH), @missing);
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close SSH or die "copying store paths to remote machine ‘$sshHost’ failed: $?";
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}
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}
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}
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1;
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