Skip OWNERS checks for CQ dry runs

The CQ dry run feature was announced in https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/G5-X0_tfmok

The primary complain is that the presubmit builders fail because of OWNERS checks or because of "Missing LGTM from someone other than...".
This change skips those checks for dry runs.

BUG=chromium:477190

Review URL: https://codereview.chromium.org/1090943003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@294853 0039d316-1c4b-4281-b951-d872f2087c98

presubmit_canned_checks.py

@@ -854,7 +854,11 @@ def CheckOwners(input_api, output_api, source_file_filter=None):
     if input_api.tbr:
       return [output_api.PresubmitNotifyResult(
           '--tbr was specified, skipping OWNERS check')]
-    if not input_api.change.issue:
+    if input_api.change.issue:
+      if _GetRietveldIssueProps(input_api, None).get('cq_dry_run', False):
+        return [output_api.PresubmitNotifyResult(
+            'This is a CQ dry run, skipping OWNERS check')]
+    else:
       return [output_api.PresubmitError("OWNERS check failed: this change has "
           "no Rietveld issue number, so we can't check it for approvals.")]
     needed = 'LGTM from an OWNER'

tests/presubmit_unittest.py

@@ -2570,7 +2570,7 @@ class CannedChecksUnittest(PresubmitTestsBase):
   def AssertOwnersWorks(self, tbr=False, issue='1', approvers=None,
       reviewers=None, is_committing=True, rietveld_response=None,
       uncovered_files=None, expected_output='',
-      manually_specified_reviewers=None):
+      manually_specified_reviewers=None, cq_dry_run=False):
     if approvers is None:
       # The set of people who lgtm'ed a change.
       approvers = set()
@@ -2598,6 +2598,7 @@ class CannedChecksUnittest(PresubmitTestsBase):
     input_api.tbr = tbr
 
     if not is_committing or (not tbr and issue):
+      if not cq_dry_run:
         affected_file.LocalPath().AndReturn('foo/xyz.cc')
         change.AffectedFiles(file_filter=None).AndReturn([affected_file])
       if issue and not rietveld_response:
@@ -2612,9 +2613,14 @@ class CannedChecksUnittest(PresubmitTestsBase):
 
       if is_committing:
         people = approvers
+        if issue:
+          input_api.rietveld.get_issue_properties(
+              issue=int(input_api.change.issue), messages=None).AndReturn(
+                  rietveld_response)
       else:
         people = reviewers
 
+      if not cq_dry_run:
         if issue:
           input_api.rietveld.get_issue_properties(
               issue=int(input_api.change.issue), messages=True).AndReturn(
@@ -2635,6 +2641,23 @@ class CannedChecksUnittest(PresubmitTestsBase):
       results[0].handle(output)
     self.assertEquals(output.getvalue(), expected_output)
 
+  def testCannedCheckOwners_DryRun(self):
+    response = {
+      "owner_email": "john@example.com",
+      "cq_dry_run": True,
+      "reviewers": ["ben@example.com"],
+    }
+    self.AssertOwnersWorks(approvers=set(),
+        cq_dry_run=True,
+        rietveld_response=response,
+        reviewers=set(["ben@example.com"]),
+        expected_output='This is a CQ dry run, skipping OWNERS check\n')
+
+    self.AssertOwnersWorks(approvers=set(['ben@example.com']),
+        is_committing=False,
+        rietveld_response=response,
+        expected_output='')
+
   def testCannedCheckOwners_Approved(self):
     response = {
       "owner_email": "john@example.com",