ywkaras commented on a change in pull request #6699:
URL: https://github.com/apache/trafficserver/pull/6699#discussion_r415939863



##########
File path: tests/gold_tests/tls/tls_client_cert.test.py
##########
@@ -293,3 +306,21 @@ def done_reload(process, hasRunFor, **kw):
 tr4fail.Processes.Default.Command = 'curl  -H host:example.com 
http://127.0.0.1:{0}/case2'.format(ts.Variables.port)
 tr4fail.Processes.Default.ReturnCode = 0
 tr4fail.Processes.Default.Streams.stdout = Testers.ContainsExpression("Could 
Not Connect", "Check response")
+
+# Parking this as a ready tester on a meaningless process
+# Stall the test runs until the squid.log file has appeared
+def access_log_ready(tsenv):
+  def done_access_log(process, hasRunFor, **kw):
+    cmd = "test -f {0}".format(ts.Disk.squid_log)
+    retval = subprocess.run(cmd, shell=True, env=tsenv)
+    return retval.returncode == 0
+
+  return done_access_log
+
+tr = Test.AddTestRun("Wait for the access log to write out")
+tr.Processes.Default.StartBefore(server4, ready=access_log_ready(ts.Env))
+tr.StillRunningAfter = ts
+tr.Processes.Default.Command = 'ls'

Review comment:
       Hmm seems questionable that creating a directory entry and writing the 
file would be a single atomic filesystem op.  But, since this is Python, I 
suppose the delay between seeing the file exists and actually reading it should 
 be sufficient for the writing to be complete.




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