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* New command `nix-copy-closure' to copy a closure to a Nix store on

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another machine through ssh.  E.g.,

    $ nix-copy-closure xyzzy $(which svn)

  copies the closure of Subversion to machine `xyzzy'.  This is like
  `nix-pack-closure $(which svn) | ssh xyzzy', but it's much more
  efficient since it only copies those paths that are missing on the
  target machine.
This commit is contained in:
Eelco Dolstra 2007-02-21 23:14:53 +00:00
parent 7f6161ab3a
commit 024a8ed382
2 changed files with 58 additions and 1 deletions
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4
scripts/Makefile.am
View file

@ -1,7 +1,8 @@
bin_SCRIPTS = nix-collect-garbage \
nix-pull nix-push nix-prefetch-url \
nix-install-package nix-channel nix-build \
nix-pack-closure nix-unpack-closure
nix-pack-closure nix-unpack-closure \
nix-copy-closure
noinst_SCRIPTS = nix-profile.sh generate-patches.pl find-runtime-roots.pl
@ -30,4 +31,5 @@ EXTRA_DIST = nix-collect-garbage.in \
download-using-manifests.pl.in \
generate-patches.pl.in \
nix-pack-closure.in nix-unpack-closure.in \
nix-copy-closure.in \
find-runtime-roots.pl.in

55
scripts/nix-copy-closure.in Normal file
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@ -0,0 +1,55 @@
#! @perl@ -w
my $binDir = $ENV{"NIX_BIN_DIR"};
$binDir = "@bindir@" unless defined $binDir;
# Get the target host.
my $sshHost = shift @ARGV;
# !!! Copied from nix-pack-closure, should put this in a module.
my %storePathsSeen;
my @storePaths = ();
while (@ARGV) {
my $storePath = shift @ARGV;
# $storePath might be a symlink to the store, so resolve it.
$storePath = (`$binDir/nix-store --query --resolve '$storePath'`
or die "cannot resolve `$storePath'");
chomp $storePath;
# Get the closure of this path.
my $pid = open(READ,
"$binDir/nix-store --query --requisites '$storePath'|") or die;
while (<READ>) {
chomp;
die "bad: $_" unless /^\//;
if (!defined $storePathsSeen{$_}) {
push @storePaths, $_;
$storePathsSeen{$_} = 1;
}
}
close READ or die "nix-store failed: $?";
}
# Ask the remote host which paths are invalid.
open(READ, "-|", "ssh", $sshHost, "nix-store", "--check-validity", "--print-invalid", @storePaths);
my @missing = ();
while (<READ>) {
chomp;
print STDERR "target needs $_\n";
push @missing, $_;
}
close READ or die;
# Export the store paths and import them on the remote machine.
if (scalar @missing > 0) {
system("nix-store --export @missing | ssh $sshHost nix-store --import") == 0
or die "copying store paths to remote machine failed: $?";
}