Remove unused function GetPreferredTryMasters

Only usage was in v8, and that was removed in 2016:
http://crrev/45ec73da150e02fac1fc1dc15e3f14cb5bc2b45f

R=tandrii@chromium.org

Change-Id: I6aebcf1fc0cc29440b0b9c9b45d4e3fc35a38e53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3214209Reviewed-by: Andrii Shyshkalov <tandrii@google.com>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>

presubmit_support.py

@@ -1342,37 +1342,6 @@ def ListRelevantPresubmitFiles(files, root):
   return results
 
 
-class GetTryMastersExecuter(object):
-  @staticmethod
-  def ExecPresubmitScript(script_text, presubmit_path, project, change):
-    """Executes GetPreferredTryMasters() from a single presubmit script.
-
-    Args:
-      script_text: The text of the presubmit script.
-      presubmit_path: Project script to run.
-      project: Project name to pass to presubmit script for bot selection.
-
-    Return:
-      A map of try masters to map of builders to set of tests.
-    """
-    context = {}
-    try:
-      exec(compile(script_text, 'PRESUBMIT.py', 'exec', dont_inherit=True),
-           context)
-    except Exception as e:
-      raise PresubmitFailure('"%s" had an exception.\n%s'
-                             % (presubmit_path, e))
-
-    function_name = 'GetPreferredTryMasters'
-    if function_name not in context:
-      return {}
-    get_preferred_try_masters = context[function_name]
-    if not len(inspect.getargspec(get_preferred_try_masters)[0]) == 2:
-      raise PresubmitFailure(
-          'Expected function "GetPreferredTryMasters" to take two arguments.')
-    return get_preferred_try_masters(project, change)
-
-
 class GetPostUploadExecuter(object):
   @staticmethod
   def ExecPresubmitScript(script_text, presubmit_path, gerrit_obj, change):
@@ -1416,57 +1385,6 @@ def _MergeMasters(masters1, masters2):
   return result
 
 
-def DoGetTryMasters(change,
-                    changed_files,
-                    repository_root,
-                    default_presubmit,
-                    project,
-                    verbose,
-                    output_stream):
-  """Get the list of try masters from the presubmit scripts.
-
-  Args:
-    changed_files: List of modified files.
-    repository_root: The repository root.
-    default_presubmit: A default presubmit script to execute in any case.
-    project: Optional name of a project used in selecting trybots.
-    verbose: Prints debug info.
-    output_stream: A stream to write debug output to.
-
-  Return:
-    Map of try masters to map of builders to set of tests.
-  """
-  presubmit_files = ListRelevantPresubmitFiles(changed_files, repository_root)
-  if not presubmit_files and verbose:
-    output_stream.write('Warning, no PRESUBMIT.py found.\n')
-  results = {}
-  executer = GetTryMastersExecuter()
-
-  if default_presubmit:
-    if verbose:
-      output_stream.write('Running default presubmit script.\n')
-    fake_path = os.path.join(repository_root, 'PRESUBMIT.py')
-    results = _MergeMasters(results, executer.ExecPresubmitScript(
-        default_presubmit, fake_path, project, change))
-  for filename in presubmit_files:
-    filename = os.path.abspath(filename)
-    if verbose:
-      output_stream.write('Running %s\n' % filename)
-    # Accept CRLF presubmit script.
-    presubmit_script = gclient_utils.FileRead(filename, 'rU')
-    results = _MergeMasters(results, executer.ExecPresubmitScript(
-        presubmit_script, filename, project, change))
-
-  # Make sets to lists again for later JSON serialization.
-  for builders in results.values():
-    for builder in builders:
-      builders[builder] = list(builders[builder])
-
-  if results and verbose:
-    output_stream.write('%s\n' % str(results))
-  return results
-
-
 def DoPostUploadExecuter(change,
                          gerrit_obj,
                          verbose):

tests/presubmit_unittest.py

@@ -893,27 +893,6 @@ def CheckChangeOnCommit(input_api, output_api):
           'on the file to figure out who to ask for help.\n')
       self.assertEqual(sys.stdout.getvalue(), text)
 
-  def testGetTryMastersExecuter(self):
-    change = self.ExampleChange(
-        extra_lines=['STORY=http://tracker.com/42', 'BUG=boo\n'])
-    executer = presubmit.GetTryMastersExecuter()
-    self.assertEqual({}, executer.ExecPresubmitScript('', '', '', change))
-    self.assertEqual({},
-        executer.ExecPresubmitScript('def foo():\n  return\n', '', '', change))
-
-    expected_result = {'m1': {'s1': set(['t1', 't2'])},
-                       'm2': {'s1': set(['defaulttests']),
-                              's2': set(['defaulttests'])}}
-    empty_result1 = {}
-    empty_result2 = {'m': {}}
-    space_in_name_result = {'m r': {'s\tv': set(['t1'])}}
-    for result in (
-        expected_result, empty_result1, empty_result2, space_in_name_result):
-      self.assertEqual(
-          result,
-          executer.ExecPresubmitScript(
-              self.presubmit_trymaster % result, '', '', change))
-
   def ExampleChange(self, extra_lines=None):
     """Returns an example Change instance for tests."""
     description_lines = [
@@ -955,44 +934,6 @@ def CheckChangeOnCommit(input_api, output_api):
     for permutation in itertools.permutations(parts):
       self.assertEqual(expected, functools.reduce(merge, permutation, {}))
 
-  def testDoGetTryMasters(self):
-    root_text = (self.presubmit_trymaster
-        % '{"t1.cr": {"win": set(["defaulttests"])}}')
-    linux_text = (self.presubmit_trymaster
-        % ('{"t1.cr": {"linux1": set(["t1"])},'
-           ' "t2.cr": {"linux2": set(["defaulttests"])}}'))
-
-    filename = 'foo.cc'
-    filename_linux = os.path.join('linux_only', 'penguin.cc')
-    root_presubmit = os.path.join(self.fake_root_dir, 'PRESUBMIT.py')
-    linux_presubmit = os.path.join(
-        self.fake_root_dir, 'linux_only', 'PRESUBMIT.py')
-
-    os.path.isfile.side_effect = (
-        lambda f: f in [root_presubmit, linux_presubmit])
-    os.listdir.return_value = ['PRESUBMIT.py']
-    gclient_utils.FileRead.side_effect = (
-        lambda f, _: root_text if f == root_presubmit else linux_text)
-
-    change = presubmit.Change(
-        'mychange', '', self.fake_root_dir, [], 0, 0, None)
-
-    output = StringIO()
-    self.assertEqual({'t1.cr': {'win': ['defaulttests']}},
-                     presubmit.DoGetTryMasters(change, [filename],
-                                               self.fake_root_dir,
-                                               None, None, False, output))
-    output = StringIO()
-    expected = {
-      't1.cr': {'win': ['defaulttests'], 'linux1': ['t1']},
-      't2.cr': {'linux2': ['defaulttests']},
-    }
-    self.assertEqual(expected,
-                     presubmit.DoGetTryMasters(change,
-                                               [filename, filename_linux],
-                                               self.fake_root_dir, None, None,
-                                               False, output))
-
   def testMainPostUpload(self):
     os.path.isfile.side_effect = lambda f: 'PRESUBMIT.py' in f
     os.listdir.return_value = ['PRESUBMIT.py']