* debian/patches/check_postmaster.patch: New patch, replaces the process

creation time check for postmaster presense with sending signal 0, similar
    to what pg_ctl does.  Closes: #909532.

debian/changelog

@@ -3,6 +3,9 @@ patroni (1.5.0-4) UNRELEASED; urgency=medium
   [ Michael Banck ]
   * debian/gitlab-ci.yml: Run origtargz as `builduser' user during the .build
     stage and without during the .test stage.
+  * debian/patches/check_postmaster.patch: New patch, replaces the process
+    creation time check for postmaster presense with sending signal 0, similar
+    to what pg_ctl does.  Closes: #909532.
 
  -- Debian PostgreSQL Maintainers <team+postgresql@tracker.debian.org>  Tue, 25 Sep 2018 15:55:22 +0200
 

debian/patches/check_postmaster.patch

@@ -0,0 +1,25 @@
+--- ./patroni/postmaster.py	2018-09-26 13:58:59.000000000 +0200
++++ ./patroni/postmaster.py_	2018-09-26 13:58:54.567944491 +0200
+@@ -39,14 +39,15 @@
+             return {}
+ 
+     def _is_postmaster_process(self):
++        postmaster_pid = int(self._postmaster_pid.get('pid', 0))
+         try:
+-            start_time = int(self._postmaster_pid.get('start_time', 0))
+-            if start_time and abs(self.create_time() - start_time) > 3:
+-                logger.info('Process %s is not postmaster, too much difference between PID file start time %s and '
+-                            'process start time %s', self.pid, self.create_time(), start_time)
+-                return False
+-        except ValueError:
+-            logger.warning('Garbage start time value in pid file: %r', self._postmaster_pid.get('start_time'))
++            self.send_signal(0)
++        except psutil.NoSuchProcess:
++            logger.warning("Could not send stop signal to PostgreSQL")
++            return False
++        except psutil.AccessDenied as e:
++            logger.warning("Could not send stop signal to PostgreSQL (error: {0})".format(e))
++            return False
+ 
+         # Extra safety check. The process can't be ourselves, our parent or our direct child.
+         if self.pid == os.getpid() or self.pid == os.getppid() or self.ppid() == os.getpid():

debian/patches/series

@@ -4,3 +4,4 @@ coverage_binary.patch
 consul_import.patch
 patroni_service.patch
 behave_failure_logging.patch
+check_postmaster.patch