guard-step: stop the command when Woodpecker cancels a step with SIGKILL [CI]

scripts/test-guard-step.py

@@ -73,6 +73,23 @@ class GuardStepTests(unittest.TestCase):
         self.assertFalse(alive(child))
         self.assertEqual(self.guard('next', 30, 'true', stderr=subprocess.DEVNULL).wait(timeout=20), 125)
 
+    def test_sigkill_of_the_guard_like_a_woodpecker_cancel_still_stops_the_command(self):
+        # Woodpecker 取消步骤时只对步骤的进程组发 SIGKILL，守卫自己抓不到；命令在另一个会话里，要靠看门进程收尾
+        self.env['MOSHIRO_GUARD_GRACE'] = '1'
+        pid_file = Path(self.directory.name) / 'killed.pid'
+        step = self.guard('cancelled', 120, 'bash', '-c', f'echo $$ > {pid_file}; sleep 120 & wait', stderr=subprocess.DEVNULL)
+        deadline = time.monotonic() + 10
+        while not pid_file.exists() and time.monotonic() < deadline:
+            time.sleep(0.1)
+        time.sleep(0.5)
+        command = int(pid_file.read_text())
+        step.kill()
+        step.wait(timeout=10)
+        deadline = time.monotonic() + 15
+        while alive(command) and time.monotonic() < deadline:
+            time.sleep(0.2)
+        self.assertFalse(alive(command))
+
     def test_a_background_process_left_by_a_finished_step_is_killed(self):
         pid_file = Path(self.directory.name) / 'orphan.pid'
         step = self.guard('leaky', 30, 'bash', '-c', f'sleep 120 & echo $! > {pid_file}', stderr=subprocess.DEVNULL)