209 lines
6.3 KiB
Perl
Executable file
209 lines
6.3 KiB
Perl
Executable file
#! @perl@ -w
|
|
|
|
use strict;
|
|
use Fcntl ':flock';
|
|
use English '-no_match_vars';
|
|
|
|
# General operation:
|
|
#
|
|
# Try to find a free machine of type $neededSystem. We do this as
|
|
# follows:
|
|
# - We acquire an exclusive lock on $currentLoad/main-lock.
|
|
# - For each machine $machine of type $neededSystem and for each $slot
|
|
# less than the maximum load for that machine, we try to get an
|
|
# exclusive lock on $currentLoad/$machine-$slot (without blocking).
|
|
# If we get such a lock, we send "accept" to the caller. Otherwise,
|
|
# we send "postpone" and exit.
|
|
# - We release the exclusive lock on $currentLoad/main-lock.
|
|
# - We perform the build on $neededSystem.
|
|
# - We release the exclusive lock on $currentLoad/$machine-$slot.
|
|
#
|
|
# The nice thing about this scheme is that if we die prematurely, the
|
|
# locks are released automatically.
|
|
|
|
my $loadIncreased = 0;
|
|
|
|
my ($amWilling, $localSystem, $neededSystem, $drvPath, $mustRun, $maxSilentTime) = @ARGV;
|
|
$mustRun = 0 unless defined $mustRun;
|
|
$maxSilentTime = 0 unless defined $maxSilentTime;
|
|
|
|
sub sendReply {
|
|
my $reply = shift;
|
|
print STDERR "# $reply\n";
|
|
}
|
|
|
|
sub decline {
|
|
sendReply "decline";
|
|
exit 0;
|
|
}
|
|
|
|
my $currentLoad = $ENV{"NIX_CURRENT_LOAD"};
|
|
decline unless defined $currentLoad;
|
|
mkdir $currentLoad, 0777 or die unless -d $currentLoad;
|
|
|
|
my $conf = $ENV{"NIX_REMOTE_SYSTEMS"};
|
|
decline if !defined $conf || ! -e $conf;
|
|
|
|
my $canBuildLocally = $amWilling && ($localSystem eq $neededSystem);
|
|
|
|
|
|
# Otherwise find a willing remote machine.
|
|
my @machines;
|
|
my %curJobs;
|
|
|
|
|
|
# Read the list of machines.
|
|
open CONF, "< $conf" or die;
|
|
|
|
while (<CONF>) {
|
|
chomp;
|
|
s/\#.*$//g;
|
|
next if /^\s*$/;
|
|
/^\s*(\S+)\s+(\S+)\s+(\S+)\s+(\d+)\s*$/ or die;
|
|
push @machines,
|
|
{ hostName => $1
|
|
, systemType => $2
|
|
, sshKeys => $3
|
|
, maxJobs => $4
|
|
};
|
|
}
|
|
|
|
close CONF;
|
|
|
|
|
|
# Acquire the exclusive lock on $currentLoad/main-lock.
|
|
my $mainLock = "$currentLoad/main-lock";
|
|
open MAINLOCK, ">>$mainLock" or die;
|
|
flock(MAINLOCK, LOCK_EX) or die;
|
|
|
|
|
|
# Find a suitable system.
|
|
my $rightType = 0;
|
|
my $machine;
|
|
LOOP: foreach my $cur (@machines) {
|
|
if ($neededSystem eq $cur->{systemType}) {
|
|
$rightType = 1;
|
|
|
|
# We have a machine of the right type. Try to get a lock on
|
|
# one of the machine's lock files.
|
|
my $slot = 0;
|
|
while ($slot < $cur->{maxJobs} || ($mustRun && !$canBuildLocally)) {
|
|
my $slotLock = "$currentLoad/" . $cur->{systemType} . "-" . $cur->{hostName} . "-$slot";
|
|
open SLOTLOCK, ">>$slotLock" or die;
|
|
if (flock(SLOTLOCK, LOCK_EX | LOCK_NB)) {
|
|
print STDERR "warning: exceeding maximum load on " . $cur->{systemType} . "\n"
|
|
if $slot >= $cur->{maxJobs};
|
|
$machine = $cur;
|
|
last LOOP;
|
|
}
|
|
close SLOTLOCK;
|
|
$slot++;
|
|
}
|
|
}
|
|
}
|
|
|
|
close MAINLOCK;
|
|
|
|
|
|
# Didn't find one? Then decline or postpone.
|
|
if (!defined $machine) {
|
|
# Postpone if we have a machine of the right type, except if the
|
|
# local system can and wants to do the build.
|
|
if ($rightType && !$canBuildLocally) {
|
|
sendReply "postpone";
|
|
exit 0;
|
|
} else {
|
|
decline;
|
|
}
|
|
}
|
|
|
|
# Yes we did, accept.
|
|
sendReply "accept";
|
|
my $x = <STDIN>;
|
|
chomp $x;
|
|
|
|
if ($x ne "okay") {
|
|
exit 0;
|
|
}
|
|
|
|
|
|
# Do the actual job.
|
|
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="} = "";
|
|
|
|
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;
|
|
}
|
|
|
|
my $inputs = `cat inputs`; die if ($? != 0);
|
|
$inputs =~ s/\n/ /g;
|
|
|
|
my $outputs = `cat outputs`; die if ($? != 0);
|
|
$outputs =~ s/\n/ /g;
|
|
|
|
print "copying inputs...\n";
|
|
|
|
my $maybeSign = "";
|
|
$maybeSign = "--sign" if -e "/nix/etc/nix/signing-key.sec";
|
|
|
|
system("NIX_SSHOPTS=\"$sshOpts\" nix-copy-closure --gzip $hostName $maybeSign $drvPath $inputs") == 0
|
|
or die "cannot copy inputs to $hostName: $?";
|
|
|
|
print "building...\n";
|
|
|
|
my $buildFlags = "--max-silent-time $maxSilentTime";
|
|
|
|
# `-tt' forces allocation of a pseudo-terminal. This is required to
|
|
# make the remote nix-store process receive a signal when the
|
|
# 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 -K $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
|
|
# code 100. It's important to distinguish between the two because
|
|
# the first is a transient failure and the latter is permanent.
|
|
my $res = $? == -1 || ($? >> 8) == 255 ? 1 : 100;
|
|
print STDERR "build of `$drvPath' on `$hostName' failed with exit code $?\n";
|
|
exit $res;
|
|
}
|
|
|
|
print "build of `$drvPath' on `$hostName' succeeded\n";
|
|
|
|
foreach my $output (split '\n', $outputs) {
|
|
my $maybeSignRemote = "";
|
|
$maybeSignRemote = "--sign" if $UID != 0;
|
|
|
|
system("ssh $sshOpts $hostName 'nix-store --export $maybeSignRemote $output | gzip' | gunzip | @bindir@/nix-store --import > /dev/null") == 0
|
|
or die "cannot copy $output from $hostName: $?";
|
|
}
|