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* Use SSH connection sharing in the remote build script.

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* Removed the Cygwin password hack since the problem is apparently
  fixed in Visual Studio.
This commit is contained in:
Eelco Dolstra 2010-02-03 20:12:18 +00:00
parent bc1e478db1
commit f56a039775
1 changed files with 16 additions and 36 deletions
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52
scripts/build-remote.pl.in
View file

@ -1,9 +1,10 @@
#! @perl@ -w
#! @perl@ -w -I@libexecdir@/nix
use strict;
use Fcntl ':flock';
use English '-no_match_vars';
use IO::Handle;
use ssh qw/sshOpts openSSHConnection/;
# General operation:
#
@ -22,6 +23,14 @@ use IO::Handle;
# The nice thing about this scheme is that if we die prematurely, the
# locks are released automatically.
# Make sure that we don't get any SSH passphrase or host key popups -
# if there is any problem it should fail, not do something
# interactive.
$ENV{"DISPLAY"} = "";
$ENV{"SSH_ASKPASS"} = "";
my $loadIncreased = 0;
my ($amWilling, $localSystem, $neededSystem, $drvPath, $maxSilentTime) = @ARGV;
@ -178,38 +187,9 @@ if ($x ne "okay") {
my $hostName = $machine->{hostName};
print STDERR "building `$drvPath' on `$hostName'\n";
# Make sure that we don't get any SSH passphrase or host key popups -
# if there is any problem it should fail, not do something
# interactive.
$ENV{"DISPLAY"} = "";
$ENV{"SSH_PASSWORD_FILE="} = "";
$ENV{"SSH_ASKPASS="} = "";
push @sshOpts, "-i", $machine->{sshKeys}, "-x";
my $sshOpts = "-i " . $machine->{sshKeys} . " -x";
# Hack to support Cygwin: if we login without a password, we don't
# have exactly the same rights as when we do. This causes the
# Microsoft C compiler to fail with certain flags:
#
# http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=99676
#
# So as a workaround, we pass a verbatim password. ssh tries to makes
# this very hard; the trick is to make it call SSH_ASKPASS to get the
# password. (It only calls this command when there is no controlling
# terminal, but Nix ensures that is is the case. When doing this
# manually, use setsid(1).)
if ($machine->{sshKeys} =~ /^password:/) {
my $passwordFile = $machine->{sshKeys};
$passwordFile =~ s/^password://;
$sshOpts = "ssh -x";
$ENV{"SSH_PASSWORD_FILE"} = $passwordFile;
$ENV{"SSH_ASKPASS"} = "/tmp/writepass";
open WRITEPASS, ">/tmp/writepass" or die;
print WRITEPASS "#! /bin/sh\ncat \"\$SSH_PASSWORD_FILE\"";
close WRITEPASS;
chmod 0755, "/tmp/writepass" or die;
}
openSSHConnection $hostName;
my $inputs = `cat inputs`; die if ($? != 0);
$inputs =~ s/\n/ /g;
@ -222,7 +202,7 @@ print "copying inputs...\n";
my $maybeSign = "";
$maybeSign = "--sign" if -e "/nix/etc/nix/signing-key.sec";
system("NIX_SSHOPTS=\"$sshOpts\" @bindir@/nix-copy-closure $hostName $maybeSign $drvPath $inputs") == 0
system("NIX_SSHOPTS=\"@sshOpts\" @bindir@/nix-copy-closure $hostName $maybeSign $drvPath $inputs") == 0
or die "cannot copy inputs to $hostName: $?";
print "building...\n";
@ -234,7 +214,7 @@ my $buildFlags = "--max-silent-time $maxSilentTime";
# connection dies. Without it, the remote process might continue to
# run indefinitely (that is, until it next tries to write to
# stdout/stderr).
if (system("ssh -tt $sshOpts $hostName 'nix-store --realise $buildFlags $drvPath > /dev/null'") != 0) {
if (system("ssh $hostName @sshOpts -tt 'nix-store --realise $buildFlags $drvPath > /dev/null'") != 0) {
# If we couldn't run ssh or there was an ssh problem (indicated by
# exit code 255), then we return exit code 1; otherwise we assume
# that the builder failed, which we indicated to Nix using exit
@ -251,6 +231,6 @@ foreach my $output (split '\n', $outputs) {
my $maybeSignRemote = "";
$maybeSignRemote = "--sign" if $UID != 0;
system("ssh $sshOpts $hostName 'nix-store --export $maybeSignRemote $output' | @bindir@/nix-store --import > /dev/null") == 0
system("ssh $hostName @sshOpts 'nix-store --export $maybeSignRemote $output' | @bindir@/nix-store --import > /dev/null") == 0
or die "cannot copy $output from $hostName: $?";
}