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* Don't use SSH's `-tt' flag because it doesn't seem to work

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on OpenSolaris when using connection sharing.  Instead have
  the remote side check for disconnection and kill the process 
  group when that happens.
This commit is contained in:
Eelco Dolstra 2010-10-04 12:30:46 +00:00
parent 71dfe4b90b
commit bfa6ee7d91
1 changed files with 10 additions and 6 deletions
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16
scripts/build-remote.pl.in
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@ -4,6 +4,7 @@ use Fcntl ':flock';
use English '-no_match_vars'; use English '-no_match_vars';
use IO::Handle; use IO::Handle;
use ssh qw/sshOpts openSSHConnection/; use ssh qw/sshOpts openSSHConnection/;
no warnings('once');
# General operation: # General operation:
@ -230,12 +231,15 @@ system("NIX_SSHOPTS=\"@sshOpts\" @bindir@/nix-copy-closure $hostName $maybeSign
# Perform the build. # Perform the build.
my $buildFlags = "--max-silent-time $maxSilentTime --fallback --add-root $rootsDir/\$PPID.out --option verbosity 0"; my $buildFlags = "--max-silent-time $maxSilentTime --fallback --add-root $rootsDir/\$PPID.out --option verbosity 0";
# `-tt' forces allocation of a pseudo-terminal. This is required to # We let the remote side kill its process group when the connection is
# make the remote nix-store process receive a signal when the # closed unexpectedly. This is necessary to ensure that no processes
# connection dies. Without it, the remote process might continue to # are left running on the remote system if the local Nix process is
# run indefinitely (that is, until it next tries to write to # killed. (SSH itself doesn't kill child processes if the connection
# stdout/stderr). # is interrupted unless the `-tt' flag is used to force a pseudo-tty,
if (system("ssh $hostName @sshOpts -tt 'nix-store -r $drvPath $buildFlags > /dev/null' >&4") != 0) { # in which case every child receives SIGHUP; however, `-tt' doesn't
# work on some platforms when connection sharing is used.)
pipe STDIN, DUMMY; # make sure we have a readable STDIN
if (system("ssh $hostName @sshOpts '(read; kill -INT -\$\$) <&0 & nix-store -r $drvPath $buildFlags > /dev/null' 2>&4") != 0) {
# If we couldn't run ssh or there was an ssh problem (indicated by # 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 # exit code 255), then we return exit code 1; otherwise we assume
# that the builder failed, which we indicate to Nix using exit # that the builder failed, which we indicate to Nix using exit