Add watch_deploy script.

Add the watch_deploy.py script for use on jenkins slaves deploying
onto bare metal hardware.  It tails a logfile from rsyslog
(configuration of which will be in openstack-ci-puppet) and looks
for puppet completion messages, exiting when they are found.

Change-Id: I50501845ef226a1946bcb5af40af94c0fbe3125a
Reviewed-on: https://review.openstack.org/335
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins

slave_scripts/watch_deploy.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+
+# Tail a syslog file printing each line while looking for indications
+# that puppet has completed its initial run on each host.
+# Once puppet is finished, wait 30 seconds (for any further interesting
+# log entries), then exit.
+
+import re
+import time
+import sys
+
+HOSTS = set(['baremetal%02i'%(x+1) for x in range(4)])
+LOGFILE = "/var/log/deploy.log"
+COMPLETE_RE = re.compile(r'^\w+ \w+ \d\d:\d\d:\d\d (\w+) puppet-agent\[\d+\]: Finished catalog run in \S+ seconds$')
+EXIT_DELAY = 30
+
+logf = open(LOGFILE)
+completed_hosts = set()
+exit_time = None
+         
+while True:
+    now = time.time()
+    if exit_time and exit_time < now:
+        sys.exit(0)
+
+    where = logf.tell()
+    line = logf.readline()
+    if not line:
+        time.sleep(1)
+        logf.seek(where)
+        continue
+
+    sys.stdout.write(line)
+    sys.stdout.flush()
+    m = COMPLETE_RE.match(line)
+    if m:
+        completed_hosts |= set([m.group(1)])
+        if completed_hosts == HOSTS:
+            exit_time = time.time() + EXIT_DELAY