1 files changed, 61 insertions, 0 deletions
diff --git a/third_party/nix/perl/lib/Nix/CopyClosure.pm b/third_party/nix/perl/lib/Nix/CopyClosure.pm
new file mode 100644
index 0000000000..902ee1a1bc
--- /dev/null
+++ b/third_party/nix/perl/lib/Nix/CopyClosure.pm
@@ -0,0 +1,61 @@
+package Nix::CopyClosure;
+
+use utf8;
+use strict;
+use Nix::Config;
+use Nix::Store;
+use Nix::SSH;
+use List::Util qw(sum);
+use IPC::Open2;
+
+
+sub copyToOpen {
+    my ($from, $to, $sshHost, $storePaths, $includeOutputs, $dryRun, $useSubstitutes) = @_;
+
+    $useSubstitutes = 0 if $dryRun || !defined $useSubstitutes;
+
+    # Get the closure of this path.
+    my @closure = reverse(topoSortPaths(computeFSClosure(0, $includeOutputs,
+        map { followLinksToStorePath $_ } @{$storePaths})));
+
+    # Send the "query valid paths" command with the "lock" option
+    # enabled. This prevents a race where the remote host
+    # garbage-collect paths that are already there. Optionally, ask
+    # the remote host to substitute missing paths.
+    syswrite($to, pack("L<x4L<x4L<x4", 1, 1, $useSubstitutes)) or die;
+    writeStrings(\@closure, $to);
+
+    # Get back the set of paths that are already valid on the remote host.
+    my %present;
+    $present{$_} = 1 foreach readStrings($from);
+
+    my @missing = grep { !$present{$_} } @closure;
+    return if !@missing;
+
+    my $missingSize = 0;
+    $missingSize += (queryPathInfo($_, 1))[3] foreach @missing;
+
+    printf STDERR "copying %d missing paths (%.2f MiB) to '$sshHost'...\n",
+        scalar(@missing), $missingSize / (1024**2);
+    return if $dryRun;
+
+    # Send the "import paths" command.
+    syswrite($to, pack("L<x4", 4)) or die;
+    exportPaths(fileno($to), @missing);
+    readInt($from) == 1 or die "remote machine '$sshHost' failed to import closure\n";
+}
+
+
+sub copyTo {
+    my ($sshHost, $storePaths, $includeOutputs, $dryRun, $useSubstitutes) = @_;
+
+    # Connect to the remote host.
+    my ($from, $to) = connectToRemoteNix($sshHost, []);
+
+    copyToOpen($from, $to, $sshHost, $storePaths, $includeOutputs, $dryRun, $useSubstitutes);
+
+    close $to;
+}
+
+
+1;