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nix-copy-closure: Add flag ‘--use-substitutes’

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This commit is contained in:
Eelco Dolstra 2012-11-23 16:20:16 +01:00
parent 9de6bc5d05
commit a3d6585c5a
4 changed files with 48 additions and 17 deletions
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18
doc/manual/nix-copy-closure.xml
View file

@ -28,6 +28,8 @@
<arg><option>--xz</option></arg>
<arg><option>--show-progress</option></arg>
<arg><option>--include-outputs</option></arg>
<arg><option>--use-substitutes</option></arg>
<arg><option>-s</option></arg>
<arg choice='plain'>
<replaceable>user@</replaceable><replaceable>machine</replaceable>
</arg>
@ -120,8 +122,20 @@ those paths. If this bothers you, use
<varlistentry><term><option>--include-outputs</option></term>
<listitem><para>Also copy the outputs of store derivations included
in the closure.</para></listitem>
<listitem><para>Also copy the outputs of store derivations
included in the closure.</para></listitem>
</varlistentry>
<varlistentry><term><option>--use-substitutes</option> / <option>-s</option></term>
<listitem><para>Attempt to download missing paths on the target
machine using Nix’s substitute mechanism. Any paths that cannot
be substituted on the target are still copied normally from the
source. This is useful, for instance, if the connection between
the source and target machine is slow, but the connection between
the target machine and <literal>nixos.org</literal> (the default
binary cache server) is fast.</para></listitem>
</varlistentry>

7
doc/manual/release-notes.xml
View file

@ -81,6 +81,13 @@ $ mount -o remount,ro,bind /nix/store
modifications.</para>
</listitem>
<listitem>
<para>The command <command>nix-copy-closure</command> has a new
flag <option>--use-substitutes</option> (<option>-s</option>) to
download missing paths on the target machine using the substitute
mechanism.</para>
</listitem>
<listitem>
<para>The command <command>nix-worker</command> has been renamed
to <command>nix-daemon</command>. Support for running the Nix

9
perl/lib/Nix/CopyClosure.pm
View file

@ -6,7 +6,8 @@ use Nix::Store;
sub copyTo {
my ($sshHost, $sshOpts, $storePaths, $compressor, $decompressor, $includeOutputs, $dryRun, $sign, $progressViewer) = @_;
my ($sshHost, $sshOpts, $storePaths, $compressor, $decompressor,
$includeOutputs, $dryRun, $sign, $progressViewer, $useSubstitutes) = @_;
$compressor = "$compressor |" if $compressor ne "";
$decompressor = "$decompressor |" if $decompressor ne "";
@ -16,6 +17,12 @@ sub copyTo {
my @closure = reverse(topoSortPaths(computeFSClosure(0, $includeOutputs,
map { followLinksToStorePath $_ } @{$storePaths})));
# Optionally use substitutes on the remote host.
if (!$dryRun && $useSubstitutes) {
system "ssh $sshHost @{$sshOpts} nix-store -r --ignore-unknown @closure";
# Ignore exit status because this is just an optimisation.
}
# Ask the remote host which paths are invalid. Because of limits
# to the command line length, do this in chunks. Eventually,
# we'll want to use ‘--from-stdin’, but we can't rely on the

23
scripts/nix-copy-closure.in
View file

@ -17,19 +17,14 @@ EOF
# Get the target host.
my $sshHost;
my $sign = 0;
my $compressor = "";
my $decompressor = "";
my $progressViewer = "";
my $toMode = 1;
my $includeOutputs = 0;
my $dryRun = 0;
my $useSubstitutes = 0;
# !!! Copied from nix-pack-closure, should put this in a module.
@ -71,6 +66,9 @@ while (@ARGV) {
elsif ($arg eq "--dry-run") {
$dryRun = 1;
}
elsif ($arg eq "--use-substitutes" || $arg eq "-s") {
$useSubstitutes = 1;
}
elsif (!defined $sshHost) {
$sshHost = $arg;
}
@ -84,7 +82,9 @@ openSSHConnection $sshHost or die "$0: unable to start SSH\n";
if ($toMode) { # Copy TO the remote machine.
Nix::CopyClosure::copyTo($sshHost, [ @sshOpts ], [ @storePaths ], $compressor, $decompressor, $includeOutputs, $dryRun, $sign, $progressViewer);
Nix::CopyClosure::copyTo(
$sshHost, [ @sshOpts ], [ @storePaths ], $compressor, $decompressor,
$includeOutputs, $dryRun, $sign, $progressViewer, $useSubstitutes);
}
else { # Copy FROM the remote machine.
@ -107,10 +107,13 @@ else { # Copy FROM the remote machine.
# Export the store paths on the remote machine and import them locally.
if (scalar @missing > 0) {
print STDERR "copying ", scalar @missing, " missing paths from ‘$sshHost’...\n";
$compressor = "| $compressor" if $compressor ne "";
$decompressor = "$decompressor |" if $decompressor ne "";
$progressViewer = "$progressViewer |" if $progressViewer ne "";
unless ($dryRun) {
if ($useSubstitutes) {
system "$Nix::Config::binDir/nix-store -r --ignore-unknown @missing";
}
$compressor = "| $compressor" if $compressor ne "";
$decompressor = "$decompressor |" if $decompressor ne "";
$progressViewer = "$progressViewer |" if $progressViewer ne "";
my $extraOpts = $sign ? "--sign" : "";
system("set -f; ssh $sshHost @sshOpts 'nix-store --export $extraOpts @missing $compressor' | $progressViewer $decompressor $Nix::Config::binDir/nix-store --import > /dev/null") == 0
or die "copying store paths from remote machine `$sshHost' failed: $?";