gitlab: implement the merged pipeline requirement

Change-Id: Icdaee4e9f60bd9ec9c38cec0456dcb0ed1851560

doc/source/reference/drivers/gitlab.rst

@@ -187,6 +187,11 @@ in the *opened* state (not merged yet).
       A boolean value (``true`` or ``false``) that indicates whether
       the Merge Request must be open in order to be enqueued.
 
+   .. attr:: merged
+
+      A boolean value (``true`` or ``false``) that indicates whether
+      the Merge Request must be merged or not in order to be enqueued.
+
 
 Reference pipelines configuration
 ---------------------------------

tests/base.py

@@ -1746,6 +1746,16 @@ class FakeGitlabMergeRequest(object):
         self.state = 'closed'
         self._updateTimeStamp()
 
+    def mergeMergeRequest(self):
+        self.state = 'merged'
+        self._updateTimeStamp()
+        self.merged_at = self.updated_at
+
+    def reopenMergeRequest(self):
+        self.state = 'opened'
+        self._updateTimeStamp()
+        self.merged_at = None
+
     def _addCommitInMR(self, files=[], reset=False):
         repo = self._getRepo()
         ref = repo.references[self.getMRReference()]

tests/fixtures/layouts/requirements-gitlab.yaml

@@ -4,6 +4,7 @@
     require:
       gitlab:
         open: true
+        merged: false
     trigger:
       gitlab:
         - event: gl_merge_request

tests/unit/test_gitlab_driver.py

@@ -475,3 +475,21 @@ class TestGitlabDriver(ZuulTestCase):
             A.getMergeRequestCommentedEvent('recheck'))
         self.waitUntilSettled()
         self.assertEqual(1, len(self.history))
+
+        # Merge the MR
+        A.mergeMergeRequest()
+
+        # A recheck will not trigger the job
+        self.fake_gitlab.emitEvent(
+            A.getMergeRequestCommentedEvent('recheck'))
+        self.waitUntilSettled()
+        self.assertEqual(1, len(self.history))
+
+        # Re-open the MR
+        A.reopenMergeRequest()
+
+        # A recheck will trigger the job
+        self.fake_gitlab.emitEvent(
+            A.getMergeRequestCommentedEvent('recheck'))
+        self.waitUntilSettled()
+        self.assertEqual(2, len(self.history))

zuul/driver/gitlab/gitlabmodel.py

@@ -155,14 +155,17 @@ class GitlabEventFilter(EventFilter):
 # The RefFilter should be understood as RequireFilter (it maps to
 # pipeline requires definition)
 class GitlabRefFilter(RefFilter):
-    def __init__(self, connection_name, open=None):
+    def __init__(self, connection_name, open=None, merged=None):
         RefFilter.__init__(self, connection_name)
         self.open = open
+        self.merged = merged
 
     def __repr__(self):
         ret = '<GitlabRefFilter connection_name: %s ' % self.connection_name
         if self.open is not None:
             ret += ' open: %s' % self.open
+        if self.merged is not None:
+            ret += ' merged: %s' % self.merged
         ret += '>'
         return ret
 
@@ -171,4 +174,8 @@ class GitlabRefFilter(RefFilter):
             if change.open != self.open:
                 return False
 
+        if self.merged is not None:
+            if change.is_merged != self.merged:
+                return False
+
         return True

zuul/driver/gitlab/gitlabsource.py

@@ -112,6 +112,7 @@ class GitlabSource(BaseSource):
         f = GitlabRefFilter(
             connection_name=self.connection.connection_name,
             open=config.get('open'),
+            merged=config.get('merged'),
         )
         return [f]
 
@@ -126,6 +127,7 @@ class GitlabSource(BaseSource):
 def getRequireSchema():
     require = {
         'open': bool,
+        'merged': bool,
     }
     return require