Add test for one-line shell script that exits supervisord on FATAL

References Supervisor#712
References Supervisor#733

Author: mnaberez

supervisor/tests/fixtures/issue-733.conf

@@ -0,0 +1,31 @@
+[supervisord]
+loglevel=debug               ; log level; default info; others: debug,warn,trace
+logfile=/tmp/issue-733.log   ; main log file; default $CWD/supervisord.log
+pidfile=/tmp/issue-733.pid   ; supervisord pidfile; default supervisord.pid
+nodaemon=true                ; start in foreground if true; default false
+
+;
+;This command does not exist so the process will enter the FATAL state.
+;
+[program:nonexistent]
+command=%(here)s/nonexistent
+startsecs=0
+startretries=0
+autorestart=false
+
+;
+;The one-line eventlistener below will cause supervisord to exit when any process
+;enters the FATAL state.  Based on:
+;https://github.com/Supervisor/supervisor/issues/733#issuecomment-781254766
+;
+;Differences from that example:
+;  1. $PPID is used instead of a hardcoded PID 1.  Child processes are always forked
+;     from supervisord, so their PPID is the PID of supervisord.
+;  2. "printf" is used instead of "echo".  The result "OK" must not have a newline
+;     or else the protocol will be violated and supervisord will log a warning.
+;
+[eventlistener:fatalexit]
+events=PROCESS_STATE_FATAL
+command=sh -c 'while true; do printf "READY\n"; read line; kill -15 $PPID; printf "RESULT 2\n"; printf "OK"; done'
+startsecs=0
+startretries=0

supervisor/tests/test_end_to_end.py

@@ -91,6 +91,15 @@ def test_issue_664(self):
             seen = False
         self.assertTrue(seen)
 
+    def test_issue_733(self):
+        filename = pkg_resources.resource_filename(__name__, 'fixtures/issue-733.conf')
+        args = ['-m', 'supervisor.supervisord', '-c', filename]
+        supervisord = pexpect.spawn(sys.executable, args, encoding='utf-8')
+        self.addCleanup(supervisord.kill, signal.SIGINT)
+        supervisord.expect_exact('gave up: nonexistent entered FATAL state')
+        supervisord.expect_exact('received SIGTERM indicating exit request')
+        supervisord.expect(pexpect.EOF)
+
     def test_issue_835(self):
         filename = pkg_resources.resource_filename(__name__, 'fixtures/issue-835.conf')
         args = ['-m', 'supervisor.supervisord', '-c', filename]