1 files changed, 102 insertions, 0 deletions
diff --git a/scripts/copy-from-other-stores.pl.in b/scripts/copy-from-other-stores.pl.in
new file mode 100755
index 000000000000..cf36bae9e803
--- /dev/null
+++ b/scripts/copy-from-other-stores.pl.in
@@ -0,0 +1,102 @@
+#! @perl@ -w @perlFlags@
+
+use utf8;
+use strict;
+use File::Basename;
+use IO::Handle;
+
+my $binDir = $ENV{"NIX_BIN_DIR"} || "@bindir@";
+
+
+STDOUT->autoflush(1);
+
+my @remoteStoresAll = split ':', ($ENV{"NIX_OTHER_STORES"} or "");
+
+my @remoteStores;
+foreach my $dir (@remoteStoresAll) {
+    push @remoteStores, glob($dir);
+}
+
+exit if scalar @remoteStores == 0;
+print "\n";
+
+
+$ENV{"NIX_REMOTE"} = "";
+
+
+sub findStorePath {
+    my $storePath = shift;
+    foreach my $store (@remoteStores) {
+        my $sourcePath = "$store/store/" . basename $storePath;
+        next unless -e $sourcePath || -l $sourcePath;
+        $ENV{"NIX_DB_DIR"} = "$store/var/nix/db";
+        return ($store, $sourcePath) if
+            system("$binDir/nix-store --check-validity $storePath") == 0;
+    }
+    return undef;
+}
+
+
+if ($ARGV[0] eq "--query") {
+
+    while (<STDIN>) {
+        chomp;
+        my ($cmd, @args) = split " ", $_;
+
+        if ($cmd eq "have") {
+            foreach my $storePath (@args) {
+                print "$storePath\n" if defined findStorePath($storePath);
+            }
+            print "\n";
+        }
+
+        elsif ($cmd eq "info") {
+            foreach my $storePath (@args) {
+                my ($store, $sourcePath) = findStorePath($storePath);
+                next unless defined $store;
+
+                $ENV{"NIX_DB_DIR"} = "$store/var/nix/db";
+
+                my $deriver = `$binDir/nix-store --query --deriver $storePath`;
+                die "cannot query deriver of ‘$storePath’" if $? != 0;
+                chomp $deriver;
+                $deriver = "" if $deriver eq "unknown-deriver";
+
+                my @references = split "\n",
+                    `$binDir/nix-store --query --references $storePath`;
+                die "cannot query references of ‘$storePath’" if $? != 0;
+
+                my $narSize = `$binDir/nix-store --query --size $storePath`;
+                die "cannot query size of ‘$storePath’" if $? != 0;
+                chomp $narSize;
+
+                print "$storePath\n";
+                print "$deriver\n";
+                print scalar @references, "\n";
+                print "$_\n" foreach @references;
+                print "0\n";
+                print "$narSize\n";
+            }
+
+            print "\n";
+        }
+
+        else { die "unknown command ‘$cmd’"; }
+    }
+}
+
+
+elsif ($ARGV[0] eq "--substitute") {
+    die unless scalar @ARGV == 3;
+    my $storePath = $ARGV[1];
+    my $destPath = $ARGV[2];
+    my ($store, $sourcePath) = findStorePath $storePath;
+    die unless $store;
+    print STDERR "\n*** Copying ‘$storePath’ from ‘$sourcePath’\n\n";
+    system("$binDir/nix-store --dump $sourcePath | $binDir/nix-store --restore $destPath") == 0
+        or die "cannot copy ‘$sourcePath’ to ‘$storePath’";
+    print "\n"; # no hash to verify
+}
+
+
+else { die; }