[Android] Add a presubmit for devil/.

build/android/devil/PRESUBMIT.py

Index: build/android/devil/PRESUBMIT.py
diff --git a/build/android/devil/PRESUBMIT.py b/build/android/devil/PRESUBMIT.py
new file mode 100644
index 0000000000000000000000000000000000000000..e2c3dfe5107f1bd9e047df7734577082b3fb52ef
--- /dev/null
+++ b/build/android/devil/PRESUBMIT.py
@@ -0,0 +1,87 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Presubmit script for devil.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
+details on the presubmit API built into depot_tools.
+"""
+
+
+def _RunPylint(input_api, output_api):
+  return input_api.canned_checks.RunPylint(
+      input_api,
+      output_api,
+      pylintrc='pylintrc',
+      extra_paths_list=[
+          input_api.os_path.join(input_api.PresubmitLocalPath(), '..'),
+      ])
+
+
+def _RunUnitTests(input_api, output_api):
+  def J(*dirs):
+    """Returns a path relative to presubmit directory."""
+    return input_api.os_path.join(input_api.PresubmitLocalPath(), *dirs)
+
+  test_env = dict(input_api.environ)
+  test_env.update({
+    'PYTHONDONTWRITEBYTECODE': '1',
+    'PYTHONPATH': ':'.join([J(), J('..')]),
+  })
+
+  return input_api.canned_checks.RunUnitTests(
+      input_api,
+      output_api,
+      unit_tests=[
+          J('devil_env_test.py'),
+          J('android', 'battery_utils_test.py'),
+          J('android', 'device_utils_test.py'),
+          J('android', 'fastboot_utils_test.py'),
+          J('android', 'md5sum_test.py'),
+          J('android', 'logcat_monitor_test.py'),
+          J('utils', 'cmd_helper_test.py'),
+          J('utils', 'timeout_retry_unittest.py'),
+      ],
+      env=test_env)
+
+
+def _EnsureNoPylibUse(input_api, output_api):
+  def other_python_files(f):
+    this_presubmit_file = input_api.os_path.join(
+        input_api.PresubmitLocalPath(), 'PRESUBMIT.py')
+    return (f.LocalPath().endswith('.py')
+            and not f.AbsoluteLocalPath() == this_presubmit_file)
+
+  changed_files = input_api.AffectedSourceFiles(other_python_files)
+  import_error_re = input_api.re.compile(
+      r'(from pylib.* import)|(import pylib)')
+
+  errors = []
+  for f in changed_files:
+    errors.extend(
+        '%s:%d' % (f.LocalPath(), line_number)
+        for line_number, line_text in f.ChangedContents()
+        if import_error_re.search(line_text))
+
+  if errors:
+    return [output_api.PresubmitError(
+        'pylib modules should not be imported from devil modules.',
+        items=errors)]
+  return []
+
+
+def CommonChecks(input_api, output_api):
+  output = []
+  output += _RunPylint(input_api, output_api)
+  output += _RunUnitTests(input_api, output_api)
+  output += _EnsureNoPylibUse(input_api, output_api)
+  return output
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return CommonChecks(input_api, output_api)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return CommonChecks(input_api, output_api)