[test] Only run presubmit for changed status files

This turns the status files check into a source processor similar to
lint and copyright check. On upload and on trybots it will only run
on the affected files.

BUG=v8:5603
NOTRY=true

Review-Url: https://codereview.chromium.org/2553633002
Cr-Commit-Position: refs/heads/master@{#41516}

PRESUBMIT.py

@@ -67,7 +67,7 @@ def _V8PresubmitChecks(input_api, output_api):
         input_api.PresubmitLocalPath(), 'tools'))
   from presubmit import CppLintProcessor
   from presubmit import SourceProcessor
-  from presubmit import CheckStatusFiles
+  from presubmit import StatusFilesProcessor
 
   results = []
   if not CppLintProcessor().RunOnFiles(
@@ -78,7 +78,8 @@ def _V8PresubmitChecks(input_api, output_api):
     results.append(output_api.PresubmitError(
         "Copyright header, trailing whitespaces and two empty lines " \
         "between declarations check failed"))
-  if not CheckStatusFiles(input_api.PresubmitLocalPath()):
+  if not StatusFilesProcessor().RunOnFiles(
+      input_api.AffectedFiles(include_deletes=False)):
     results.append(output_api.PresubmitError("Status file check failed"))
   results.extend(input_api.canned_checks.CheckAuthorizedAuthor(
       input_api, output_api))

tools/presubmit.py

@@ -461,17 +461,23 @@ def _CheckStatusFileForDuplicateKeys(filepath):
   json.loads(contents, object_pairs_hook=check_pairs)
   return status["success"]
 
-def CheckStatusFiles(workspace):
-  success = True
-  suite_paths = utils.GetSuitePaths(join(workspace, "test"))
-  for root in suite_paths:
-    suite_path = join(workspace, "test", root)
-    status_file_path = join(suite_path, root + ".status")
-    suite = testsuite.TestSuite.LoadTestSuite(suite_path)
-    if suite and exists(status_file_path):
+
+class StatusFilesProcessor(SourceFileProcessor):
+  """Checks status files for incorrect syntax and duplicate keys."""
+
+  def IsRelevant(self, name):
+    return name.endswith('.status')
+
+  def GetPathsToSearch(self):
+    return ['test']
+
+  def ProcessFiles(self, files):
+    success = True
+    for status_file_path in files:
       success &= statusfile.PresubmitCheck(status_file_path)
       success &= _CheckStatusFileForDuplicateKeys(status_file_path)
-  return success
+    return success
+
 
 def GetOptions():
   result = optparse.OptionParser()
@@ -491,7 +497,8 @@ def Main():
   print "Running copyright header, trailing whitespaces and " \
         "two empty lines between declarations check..."
   success &= SourceProcessor().RunOnPath(workspace)
-  success &= CheckStatusFiles(workspace)
+  print "Running status-files check..."
+  success &= StatusFilesProcessor().RunOnPath(workspace)
   if success:
     return 0
   else: