Merge pull request #4447 from edx/nedbat/ansible_msg

ansible_msg.py: Utility for deciphering Ansible task output

util/ansible_msg.py

+#!/usr/bin/env python3.6
+"""Simple utility for deciphering Ansible jsonized task output."""
+
+import json
+import sys
+
+if len(sys.argv) > 1:
+    f = open(sys.argv[1])
+else:
+    if sys.stdin.isatty():
+        print("Copy one complete line of junk from ansible output, and pipe it to me.")
+        sys.exit()
+    f = sys.stdin
+
+junk = f.read()
+
+# junk:
+# '==> default: failed: [localhost] (item=/edx/app/edx_ansible/edx_ansible/requirements.txt) => {"cmd": "/edx/app/edx...'
+
+print("Stdin is {} chars: {!r}...{!r}".format(len(junk), junk[:40], junk[-40:]))
+
+junk = junk.replace('\n', '')
+junk = junk[junk.index('=> {')+3:]
+junk = junk[:junk.rindex('}')+1]
+
+data = json.loads(junk)
+
+GOOD_KEYS = ['cmd', 'msg', 'stdout', 'stderr', 'module_stdout', 'module_stderr', 'warnings']
+for key in GOOD_KEYS:
+    if data.get(key):
+        print(f"== {key} ===========================")
+        print(data[key])
+
+BAD_KEYS = ['stdout_lines', 'start', 'end', 'delta', 'changed', 'failed', 'rc', 'item']
+
+unknown_keys = set(data) - set(GOOD_KEYS) - set(BAD_KEYS)
+if unknown_keys:
+    print("== Unknown keys ======================")
+    for key in unknown_keys:
+        print(f"{key}: {data[key]!r:80}")