148 lines
3.7 KiB
Text
148 lines
3.7 KiB
Text
#! @perl@ -w
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my $binDir = $ENV{"NIX_BIN_DIR"};
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$binDir = "@bindir@" unless defined $binDir;
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if (scalar @ARGV < 1) {
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print STDERR <<EOF
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Usage: nix-copy-closure [--from | --to] HOSTNAME [--sign] [--gzip] PATHS...
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EOF
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;
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exit 1;
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}
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# Get the target host.
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my $sshHost;
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my @sshOpts = split ' ', ($ENV{"NIX_SSHOPTS"} or "");
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my $sign = 0;
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my $compressor = "cat";
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my $decompressor = "cat";
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my $toMode = 1;
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# !!! Copied from nix-pack-closure, should put this in a module.
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my @storePaths = ();
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while (@ARGV) {
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my $arg = shift @ARGV;
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if ($arg eq "--sign") {
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$sign = 1;
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}
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elsif ($arg eq "--gzip") {
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$compressor = "gzip";
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$decompressor = "gunzip";
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}
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elsif ($arg eq "--from") {
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$toMode = 0;
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}
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elsif ($arg eq "--to") {
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$toMode = 1;
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}
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elsif (!defined $sshHost) {
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$sshHost = $arg;
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}
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else {
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push @storePaths, $arg;
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}
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}
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if ($toMode) { # Copy TO the remote machine.
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my @allStorePaths;
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my %storePathsSeen;
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foreach my $storePath (@storePaths) {
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# $arg might be a symlink to the store, so resolve it.
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my $storePath2 = (`$binDir/nix-store --query --resolve '$storePath'`
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or die "cannot resolve `$storePath'");
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chomp $storePath2;
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# Get the closure of this path.
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my $pid = open(READ,
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"$binDir/nix-store --query --requisites '$storePath2'|") or die;
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while (<READ>) {
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chomp;
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die "bad: $_" unless /^\//;
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if (!defined $storePathsSeen{$_}) {
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push @allStorePaths, $_;
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$storePathsSeen{$_} = 1;
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}
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}
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close READ or die "nix-store failed: $?";
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}
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# Ask the remote host which paths are invalid.
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open(READ, "ssh @sshOpts $sshHost nix-store --check-validity --print-invalid @allStorePaths|");
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my @missing = ();
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while (<READ>) {
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chomp;
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print STDERR "target machine needs $_\n";
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push @missing, $_;
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}
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close READ or die;
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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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my $extraOpts = "";
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$extraOpts .= "--sign" if $sign == 1;
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system("nix-store --export $extraOpts @missing | $compressor | ssh @sshOpts $sshHost '$decompressor | nix-store --import'") == 0
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or die "copying store paths to remote machine `$sshHost' failed: $?";
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}
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}
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else { # Copy FROM the remote machine.
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# Query the closure of the given store paths on the remote
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# machine. Paths are assumed to be store paths; there is no
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# resolution (following of symlinks).
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my $pid = open(READ,
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"ssh @sshOpts $sshHost nix-store --query --requisites @storePaths|") or die;
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my @allStorePaths;
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my %storePathsSeen;
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while (<READ>) {
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chomp;
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die "bad: $_" unless /^\//;
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if (!defined $storePathsSeen{$_}) {
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push @allStorePaths, $_;
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$storePathsSeen{$_} = 1;
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}
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}
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close READ or die "nix-store on remote machine `$sshHost' failed: $?";
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# What paths are already valid locally?
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open(READ, "@bindir@/nix-store --check-validity --print-invalid @allStorePaths|");
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my @missing = ();
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while (<READ>) {
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chomp;
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print STDERR "local machine needs $_\n";
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push @missing, $_;
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}
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close READ or die;
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# Export the store paths on the remote machine and import them on locally.
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if (scalar @missing > 0) {
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my $extraOpts = "";
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$extraOpts .= "--sign" if $sign == 1;
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system("ssh @sshOpts $sshHost 'nix-store --export $extraOpts @missing | $compressor' | $decompressor | @bindir@/nix-store --import") == 0
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or die "copying store paths to remote machine `$sshHost' failed: $?";
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}
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}
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