Reupload of "Flock master startup."

masters/start_master.sh

Index: masters/start_master.sh
diff --git a/masters/start_master.sh b/masters/start_master.sh
new file mode 100755
index 0000000000000000000000000000000000000000..d6e1d21cbdfb758aeabf6b327e62e22b6adb7961
--- /dev/null
+++ b/masters/start_master.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+# Copyright (c) 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Starts a master and waits for its pidfile to become live. This was split out
+# of the Makefile in order to make a flock-able unit.
+
+set -e
+
+if [ -f twistd.pid ]; then
+  PID=`cat twistd.pid`
+  if [ -n $(ps -p$PID -o pid=) ]; then
+    echo "twistd.pid has pid $PID which is still alive. aborting."
+    exit 2
+  fi
+fi
+
+
+echo 'Now running Buildbot master.'
+python $SCRIPTS_DIR/common/twistd --no_save -y buildbot.tac
+
+echo 'Waiting for creation of twistd.pid...'
+while `test ! -f twistd.pid`; do sleep 1; done;
+
+PID=`cat twistd.pid`
+echo "twistd.pid contains new buildbot pid $PID"