Clean stale lockfiles on service startup : fixes bug 785955

Adds cleanup_files_locks() to nova/utils, which cleans up stale locks
left behind after process failures.

Adds a call to clean up locks on service startup for nova-api, nova-cert,
nova-compute, nova-network, nova-objectstore, and nova-scheduler.

Adds tools/clean_file_locks.py, which can be used to manually clean
stale locks.

Change-Id: I752e0b24d3c7fc5f1dc290da355cbd7f430789b8

1 files changed, 63 insertions, 0 deletions

diff --git a/tools/clean_file_locks.py b/tools/clean_file_locks.py
new file mode 100755
index 000000000..eb21177aa
--- /dev/null
+++ b/tools/clean_file_locks.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+
+# Copyright 2012 La Honda Research Center, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""clean_file_locks.py - Cleans stale interprocess locks
+
+This rountine can be used to find and delete stale lock files from
+nova's interprocess synchroization.  It can be used safely while services
+are running.
+
+"""
+
+import logging
+import optparse
+
+from nova import flags
+from nova import utils
+from nova import log
+
+
+LOG = log.getLogger('nova.utils')
+FLAGS = flags.FLAGS
+
+
+def parse_options():
+    """process command line options."""
+
+    parser = optparse.OptionParser('usage: %prog [options]')
+    parser.add_option('--verbose', action='store_true',
+                      help='List lock files found and deleted')
+
+    options, args = parser.parse_args()
+
+    return options, args
+
+
+def main():
+    """Main loop."""
+    options, args = parse_options()
+    verbose = options.verbose
+
+    if verbose:
+        LOG.logger.setLevel(logging.DEBUG)
+    else:
+        LOG.logger.setLevel(logging.INFO)
+    LOG.info('Cleaning stale locks from %s' % FLAGS.lock_path)
+    utils.cleanup_file_locks()
+    LOG.info('Finished')
+
+if __name__ == '__main__':
+    main()