job.py: handle SIGTERM gracefully

This allows showing a nice info to the user and stop showing that
the return code was an unexpected 255.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/buildstream/_scheduler/jobs/job.py b/src/buildstream/_scheduler/jobs/job.py
index 00de9053c..9570fea62 100644
--- a/src/buildstream/_scheduler/jobs/job.py
+++ b/src/buildstream/_scheduler/jobs/job.py
@@ -45,6 +45,7 @@ class _ReturnCode(FastEnum):
     FAIL = 1
     PERM_FAIL = 2
     SKIPPED = 3
+    TERMINATED = 4
 
 
 # JobStatus:
@@ -455,6 +456,13 @@ class Job():
             status = JobStatus.SKIPPED
         elif returncode in (_ReturnCode.FAIL, _ReturnCode.PERM_FAIL):
             status = JobStatus.FAIL
+        elif returncode == _ReturnCode.TERMINATED:
+            if self._terminated:
+                self.message(MessageType.INFO, "Process was terminated")
+            else:
+                self.message(MessageType.ERROR, "Process was terminated unexpectedly")
+
+            status = JobStatus.FAIL
         else:
             status = JobStatus.FAIL
 
@@ -714,6 +722,12 @@ class ChildJob():
         with _signals.suspendable(stop_time, resume_time), \
                 self._messenger.recorded_messages(self._logfile, self._logdir) as filename:
 
+            # Graciously handle sigterms.
+            def handle_sigterm(_signum, _sigframe):
+                self._child_shutdown(_ReturnCode.TERMINATED)
+
+            signal.signal(signal.SIGTERM, handle_sigterm)
+
             self.message(MessageType.START, self.action_name, logfile=filename)
 
             try: