be more flexible in getResponsibleUsers

Normally properties['owner'] shall be a string.
We got some users reporting it is a list:
#2284
I couldn't find in the code any evidence where owner would be set to a list.

We don't have much more information, so lets log a message in that case in the hope we get more
reports

master/buildbot/reporters/utils.py

@@ -15,6 +15,7 @@
 from UserList import UserList
 
 from twisted.internet import defer
+from twisted.python import log
 
 from buildbot.data import resultspec
 from buildbot.process.properties import renderer
@@ -163,7 +164,17 @@ def getResponsibleUsersForBuild(master, buildid):
 
     # add owner from properties
     if 'owner' in properties:
-        blamelist.update(properties['owner'][0])
+        owner = properties['owner'][0]
+        if isinstance(owner, basestring):
+            blamelist.add(owner)
+        else:
+            blamelist.update(owner)
+            log.msg("Warning: owner property is a list for buildid {}. ".format(buildid))
+            log.msg("Please report a bug: changes: {}. properties: {}".format(changes, properties))
+
+    # add owner from properties
+    if 'owners' in properties:
+        blamelist.update(properties['owners'][0])
 
     blamelist = list(blamelist)
     blamelist.sort()

master/buildbot/test/unit/test_reporters_utils.py

@@ -23,9 +23,10 @@
 from buildbot.reporters import utils
 from buildbot.test.fake import fakedb
 from buildbot.test.fake import fakemaster
+from buildbot.test.util import logging
 
 
-class TestDataUtils(unittest.TestCase):
+class TestDataUtils(unittest.TestCase, logging.LoggingMixin):
     LOGCONTENT = textwrap.dedent(u"""\
         line zero
         line 1
@@ -70,6 +71,8 @@ def setupDb(self):
                     buildid=_id, name="workername", value="sl"),
                 fakedb.BuildProperty(
                     buildid=_id, name="reason", value="because"),
+                fakedb.BuildProperty(
+                    buildid=_id, name="owner", value="him"),
                 fakedb.Step(id=100 + _id, buildid=_id, name="step1"),
                 fakedb.Step(id=200 + _id, buildid=_id, name="step2"),
                 fakedb.Log(id=60 + _id, stepid=100 + _id, name='stdio', slug='stdio', type='s',
@@ -96,6 +99,7 @@ def test_getDetailsForBuildset(self):
         build2 = res['builds'][1]
         buildset = res['buildset']
         self.assertEqual(build1['properties'], {u'reason': (u'because', u'fakedb'),
+                                                u'owner': (u'him', u'fakedb'),
                                                 u'workername': (u'sl', u'fakedb')})
         self.assertEqual(len(build1['steps']), 2)
         self.assertEqual(build1['buildid'], 20)
@@ -132,7 +136,29 @@ def test_getResponsibleUsersFromPatch(self):
     def test_getResponsibleUsersForBuild(self):
         self.setupDb()
         res = yield utils.getResponsibleUsersForBuild(self.master, 20)
-        self.assertEqual(res, ["me@foo"])
+        self.assertEqual(sorted(res), sorted(["me@foo", "him"]))
+
+    @defer.inlineCallbacks
+    def test_getResponsibleUsersForBuildWithBadOwner(self):
+        self.setUpLogging()
+        self.setupDb()
+        self.db.insertTestData([
+            fakedb.BuildProperty(
+                buildid=20, name="owner", value=["him"]),
+        ])
+        res = yield utils.getResponsibleUsersForBuild(self.master, 20)
+        self.assertLogged("Please report a bug")
+        self.assertEqual(sorted(res), sorted(["me@foo", "him"]))
+
+    @defer.inlineCallbacks
+    def test_getResponsibleUsersForBuildWithOwners(self):
+        self.setupDb()
+        self.db.insertTestData([
+            fakedb.BuildProperty(
+                buildid=20, name="owners", value=["him", "her"]),
+        ])
+        res = yield utils.getResponsibleUsersForBuild(self.master, 20)
+        self.assertEqual(sorted(res), sorted(["me@foo", "him", "her"]))
 
     @defer.inlineCallbacks
     def test_getPreviousBuild(self):