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* In the build hook, if connecting to a machine fails, try the other

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machines of the right type (if available).  This makes the build
  farm more robust to failures.
This commit is contained in:
Eelco Dolstra 2010-02-03 20:35:37 +00:00
parent f56a039775
commit d0c32dc135
3 changed files with 83 additions and 79 deletions
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29
scripts/build-remote.pl.in
View file

@ -71,6 +71,7 @@ while (<CONF>) {
, sshKeys => $3 , sshKeys => $3
, maxJobs => $4 , maxJobs => $4
, speedFactor => 1.0 * ($6 || 1) , speedFactor => 1.0 * ($6 || 1)
, enabled => 1
}; };
} }
@ -92,12 +93,16 @@ sub openSlotLock {
} }
my $hostName;
while (1) {
# Find all machine that can execute this build, i.e., that support # Find all machine that can execute this build, i.e., that support
# builds for the given platform and are not at their job limit. # builds for the given platform and are not at their job limit.
my $rightType = 0; my $rightType = 0;
my @available = (); my @available = ();
LOOP: foreach my $cur (@machines) { LOOP: foreach my $cur (@machines) {
if (grep { $neededSystem eq $_ } @{$cur->{systemTypes}}) { if ($cur->{enabled} && grep { $neededSystem eq $_ } @{$cur->{systemTypes}}) {
$rightType = 1; $rightType = 1;
# We have a machine of the right type. Determine the load on # We have a machine of the right type. Determine the load on
@ -166,15 +171,18 @@ utime undef, undef, $slotLock;
close MAINLOCK; close MAINLOCK;
# Connect to the selected machine.
@sshOpts = ("-i", $machine->{sshKeys}, "-x");
$hostName = $machine->{hostName};
last if openSSHConnection $hostName;
warn "unable to open SSH connection to $hostName, trying other available machines...\n";
$machine->{enabled} = 0;
}
# Tell Nix we've accepted the build. # Tell Nix we've accepted the build.
sendReply "accept"; sendReply "accept";
if (defined $ENV{NIX_DEBUG_HOOK}) {
my $hostName = $machine->{hostName};
my $sp = $machine->{speedFactor};
print STDERR "building `$drvPath' on `$hostName' - $sp - " . $selected->{free} . "\n";
sleep 10;
exit 0;
}
my $x = <STDIN>; my $x = <STDIN>;
chomp $x; chomp $x;
@ -184,13 +192,8 @@ if ($x ne "okay") {
# Do the actual build. # Do the actual build.
my $hostName = $machine->{hostName};
print STDERR "building `$drvPath' on `$hostName'\n"; print STDERR "building `$drvPath' on `$hostName'\n";
push @sshOpts, "-i", $machine->{sshKeys}, "-x";
openSSHConnection $hostName;
my $inputs = `cat inputs`; die if ($? != 0); my $inputs = `cat inputs`; die if ($? != 0);
$inputs =~ s/\n/ /g; $inputs =~ s/\n/ /g;

2
scripts/nix-copy-closure.in
View file

@ -53,7 +53,7 @@ while (@ARGV) {
} }
openSSHConnection $sshHost; openSSHConnection $sshHost or die "$0: unable to start SSH\n";
if ($toMode) { # Copy TO the remote machine. if ($toMode) { # Copy TO the remote machine.

5
scripts/ssh.pm
View file

@ -12,15 +12,16 @@ sub openSSHConnection {
my ($host) = @_; my ($host) = @_;
die if $sshStarted; die if $sshStarted;
$sshHost = $host; $sshHost = $host;
return if system("ssh $sshHost @sshOpts -O check 2> /dev/null") == 0; return 1 if system("ssh $sshHost @sshOpts -O check 2> /dev/null") == 0;
my $tmpDir = tempdir("nix-ssh.XXXXXX", CLEANUP => 1, TMPDIR => 1) my $tmpDir = tempdir("nix-ssh.XXXXXX", CLEANUP => 1, TMPDIR => 1)
or die "cannot create a temporary directory"; or die "cannot create a temporary directory";
push @sshOpts, "-S", "$tmpDir/control"; push @sshOpts, "-S", "$tmpDir/control";
system("ssh $sshHost @sshOpts -M -N -f") == 0 system("ssh $sshHost @sshOpts -M -N -f") == 0
or die "unable to start SSH: $?"; or return 0;
$sshStarted = 1; $sshStarted = 1;
return 1;
} }
# Tell the master SSH client to exit. # Tell the master SSH client to exit.