Allow to unset assignee/milestone for bug with no activity

Change-Id: I4ae13aa647ad43463c241ca8b82bba50aa3581f1

README.rst

@@ -341,6 +341,31 @@ Example:
   Check content differences between nova-stable-kilo.tar.gz and
   nova-2015.1.0rc1.tar.gz, as found on http://tarballs.openstack.org.
 
+pre_expire.by
+-------------
+
+This script fetches opened bugs for a project in order to prepare bugs with no
+activity in the last D days for expiration by:
+- unsetting bug assignee
+- unsetting bug milestone
+- setting bug status to Incomplete
+- adding a comment explaining why we updated the bug
+
+Examples:
+
+./pre_expire_bugs.py neutron --days 180
+
+Prepare for expiration neutron bugs with no activity not updated in the last
+180 days.
+
+./pre_expire_bugs.py glance --days 365 --test
+
+Test prepare for expiration on Launchpad Staging servers.
+
+./pre_expire_bugs.py glance --days 365 --dry-run
+
+Prepare for expiration dry-run: print actions without executing them.
+
 
 process_bugs.py
 ---------------

pre_expire_bugs.py

@@ -0,0 +1,111 @@
+#!/usr/bin/env python
+#
+# Script to prepare bugs with no activity for expiration
+#
+# Copyright (c) 2015 Thales Services SAS
+# All Rights Reserved.
+#
+# 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.
+
+from __future__ import print_function
+from argparse import ArgumentParser
+import datetime
+
+from launchpadlib.launchpad import Launchpad
+from lazr.restfulclient.errors import ServerError
+import pytz
+
+
+# Parameters
+parser = ArgumentParser(
+    description="Unset assignee/milestone for bugs with no activity in bulk")
+parser.add_argument('projectname', help='The project to act on')
+parser.add_argument("--test", action='store_const', const='staging',
+                    default='production', help='Use LP staging server to test')
+parser.add_argument("--dry-run", action='store_true',
+                    help="Don't actually perform any action")
+parser.add_argument("--days", type=int, default=365,
+                    help='days without activity (default: %(default)s days)')
+parser.add_argument('exceptions', type=int, nargs='*', help='Bugs to ignore')
+
+args = parser.parse_args()
+
+# Connect to Launchpad
+print("Connecting to Launchpad...")
+launchpad = Launchpad.login_with('openstack-prepare-expire', args.test)
+
+# Retrieve bugs
+print("Retrieving project...")
+proj = launchpad.projects[args.projectname]
+failed = set()
+
+modified_before = (
+    datetime.datetime.now(pytz.UTC) - datetime.timedelta(days=args.days))
+
+# Get bugtasks, older first
+open_statuses = ['New', 'Incomplete', 'Confirmed', 'Triaged', 'In Progress']
+bugtasks = proj.searchTasks(
+    order_by='date_last_updated', status=open_statuses)
+
+# Process bugs
+content = (
+    "This bug is > %s days without activity. We are unsetting assignee "
+    "and milestone and setting status to Incomplete in order to allow "
+    "its expiry in 60 days.\n\n"
+    "If the bug is still valid, then update the bug status.") % args.days
+
+for bugtask in bugtasks:
+    bug = bugtask.bug
+
+    # Process bugs with no activity after modified_before
+    if bug.date_last_updated > modified_before:
+        break
+
+    # Skip bugs which triggered timeouts in previous runs
+    if bug.id in failed:
+        continue
+
+    print(bug.id, end='')
+    if bug.id in args.exceptions:
+        print(" - excepted")
+        continue
+
+    if bugtask.assignee:
+        bugtask.assignee = None
+        print(" - unset assignee", end='')
+    if bugtask.milestone:
+        bugtask.milestone = None
+        print(" - unset milestone", end='')
+    if bugtask.status != 'Incomplete':
+        bugtask.status = 'Incomplete'
+        print(" - set status Incomplete", end='')
+
+    if not args.dry_run:
+        try:
+            bugtask.lp_save()
+            bug.lp_save()
+            bug.newMessage(content=content)
+            print(" - DONE!", end='')
+        except ServerError:
+            print(" - TIMEOUT!", end='')
+            failed.add(bug.id)
+        except Exception as e:
+            print(" - ERROR! (%s)" % e, end='')
+            failed.add(bug.id)
+    print()
+
+if failed:
+    print()
+    print("Some bugs could not be automatically updated due to LP timeouts:")
+    for bugid in failed:
+        print("http://bugs.launchpad.net/bugs/%d" % bugid)

requirements.txt

@@ -5,6 +5,8 @@ requests>=1.1
 Jinja2>=2.6  # BSD License (3 clause)
 oslo.concurrency>=1.4.1         # Apache-2.0
 parawrap
+# 2013.6 is the first version of pytz that is PEP 440 compatible.
+pytz>=2013.6
 PyYAML>=3.1.0
 zuul
 simplejson>=2.2.0