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* Add an API function exportPaths() that provides the functionality of

Browse source 
‘nix-store --export’.
* Add a Perl module that provides the functionality of
  ‘nix-copy-closure --to’.  This is used by build-remote.pl so it no
  longer needs to start a separate nix-copy-closure process.  Also, it
  uses the Perl API to do the export, so it doesn't need to start a
  separate nix-store process either.  As a result, nix-copy-closure
  and build-remote.pl should no longer fail on very large closures due
  to an "Argument list too long" error.  (Note that having very many
  dependencies in a single derivation can still fail because the
  environment can become too large.  Can't be helped though.)
This commit is contained in:
Eelco Dolstra 2011-11-23 15:13:37 +00:00
parent ab20af3e6f
commit 5bbd693cae
10 changed files with 90 additions and 38 deletions
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4
scripts/build-remote.pl.in
View file

@ -5,6 +5,7 @@ use English '-no_match_vars';
use IO::Handle;
use Nix::Config;
use Nix::SSH qw/sshOpts openSSHConnection/;
use Nix::CopyClosure;
no warnings('once');
@ -225,8 +226,7 @@ sub removeRoots {
# Copy the derivation and its dependencies to the build machine.
system("NIX_SSHOPTS=\"@sshOpts\" @bindir@/nix-copy-closure $hostName $maybeSign $drvPath @inputs") == 0
or die "cannot copy inputs to $hostName: $?";
Nix::CopyClosure::copyTo($hostName, [ @sshOpts ], [ $drvPath, @inputs ], "", "", 0, 0, $maybeSign ne "");
# Perform the build.

36
scripts/nix-copy-closure.in
View file

@ -3,6 +3,7 @@
use Nix::SSH;
use Nix::Config;
use Nix::Store;
use Nix::CopyClosure;
if (scalar @ARGV < 1) {
@ -39,8 +40,8 @@ while (@ARGV) {
$sign = 1;
}
elsif ($arg eq "--gzip") {
$compressor = "| gzip";
$decompressor = "gunzip |";
$compressor = "gzip";
$decompressor = "gunzip";
}
elsif ($arg eq "--from") {
$toMode = 0;
@ -67,30 +68,7 @@ openSSHConnection $sshHost or die "$0: unable to start SSH\n";
if ($toMode) { # Copy TO the remote machine.
# Get the closure of this path.
my @allStorePaths = reverse(topoSortPaths(computeFSClosure(0, $includeOutputs, map { followLinksToStorePath $_ } @storePaths)));
# Ask the remote host which paths are invalid.
open(READ, "set -f; ssh $sshHost @sshOpts nix-store --check-validity --print-invalid @allStorePaths|");
my @missing = ();
while (<READ>) {
chomp;
push @missing, $_;
}
close READ or die;
# Export the store paths and import them on the remote machine.
if (scalar @missing > 0) {
print STDERR "copying these missing paths:\n";
print STDERR " $_\n" foreach @missing;
unless ($dryRun) {
my $extraOpts = $sign ? "--sign" : "";
system("set -f; nix-store --export $extraOpts @missing $compressor | ssh $sshHost @sshOpts '$decompressor nix-store --import'") == 0
or die "copying store paths to remote machine `$sshHost' failed: $?";
}
}
Nix::CopyClosure::copyTo($sshHost, [ @sshOpts ], [ @storePaths ], $compressor, $decompressor, $includeOutputs, $dryRun, $sign);
}
else { # Copy FROM the remote machine.
@ -112,8 +90,10 @@ else { # Copy FROM the remote machine.
# Export the store paths on the remote machine and import them on locally.
if (scalar @missing > 0) {
print STDERR "copying these missing paths:\n";
print STDERR " $_\n" foreach @missing;
print STDERR "copying ", scalar @missing, " missing paths from ‘$sshHost’...\n";
#print STDERR " $_\n" foreach @missing;
$compressor = "| $compressor" if $compressor ne "";
$decompressor = "$decompressor |" if $decompressor ne "";
unless ($dryRun) {
my $extraOpts = $sign ? "--sign" : "";
system("set -f; ssh $sshHost @sshOpts 'nix-store --export $extraOpts @missing $compressor' | $decompressor $Nix::Config::binDir/nix-store --import") == 0