* Force allocation of a pseudo-terminal to clean up the remote

  nix-store process when the connection is interrupted.

1 files changed, 6 insertions, 1 deletions

diff --git a/scripts/build-remote.pl.in b/scripts/build-remote.pl.in
index 93bb6c32c..a7023cb4d 100755
--- a/scripts/build-remote.pl.in
+++ b/scripts/build-remote.pl.in
@@ -183,7 +183,12 @@ system("NIX_SSHOPTS=\"$sshOpts\" nix-copy-closure $hostName $maybeSign $drvPath
 
 print "BUILDING...\n";
 
-system("ssh $sshOpts $hostName 'nix-store -rvvK $drvPath'") == 0
+# `-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).
+system("ssh -tt $sshOpts $hostName 'nix-store -rvvK $drvPath'") == 0
     or die "remote build on $hostName failed: $?";
 
 print "REMOTE BUILD DONE: $drvPath on $hostName\n";