debug termination

Author: mvdbeek

planemo/io.py

@@ -5,6 +5,7 @@
 import fnmatch
 import os
 import shutil
+import signal
 import subprocess
 import sys
 import tempfile
@@ -208,10 +209,12 @@ def stop_gravity(virtual_env, gravity_state_dir, env):
 
 def kill_pid_file(pid_file: str):
     """Kill process group corresponding to specified pid file."""
+    print("Killing process group for pid file: %s" % pid_file)
     try:
         os.stat(pid_file)
     except OSError as e:
         if e.errno == errno.ENOENT:
+            print("Pid file %s does not exist, nothing to kill." % pid_file)
             return False
 
     with open(pid_file) as fh:
@@ -228,18 +231,20 @@ def kill_posix(pid: int):
 
     def _check_pid():
         try:
-            os.kill(pid, 0)
+            os.kill(pid, signal.SIGTERM)
             return True
-        except OSError:
+        except OSError as e:
+            print(f"Process {pid} does not exist or is already dead: {e}")
             return False
 
     if _check_pid():
-        for sig in [15, 9]:
+        for sig in [signal.SIGTERM, signal.SIGKILL]:
             try:
                 # gunicorn (unlike paste), seem to require killing process
                 # group
                 os.killpg(os.getpgid(pid), sig)
-            except OSError:
+            except OSError as e:
+                print(f"Failed to kill process group for pid {pid} with signal {sig}: {e}")
                 return
             time.sleep(1)
             if not _check_pid():