Add presubmit_canned_checks.CheckLicense()

It does a regexp search on the file contents to make sure it contains expected license boiler plate.

It is a generalization to implement the equivalent of ubuntu's license check script into the corresponding PRESUBMIT.py files.

TEST=unit tests
BUG=28291

Review URL: http://codereview.chromium.org/558007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@37338 0039d316-1c4b-4281-b951-d872f2087c98

presubmit_canned_checks.py

@@ -267,6 +267,25 @@ def CheckLongLines(input_api, output_api, maxlen=80, source_file_filter=None):
     return []
 
 
+def CheckLicense(input_api, output_api, license, source_file_filter=None):
+  """Verifies the license header.
+  """
+  license_re = input_api.re.compile(license, input_api.re.MULTILINE)
+  bad_files = []
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    if not license_re.search(contents):
+      bad_files.append(f.LocalPath())
+  if bad_files:
+    if input_api.is_committing:
+      res_type = output_api.PresubmitPromptWarning
+    else:
+      res_type = output_api.PresubmitNotifyResult
+    return [res_type(
+        "Found a bad license header in these files:", items=bad_files)]
+  return []
+
+
 def CheckChangeSvnEolStyle(input_api, output_api, source_file_filter=None):
   """Checks that the source files have svn:eol-style=LF."""
   return CheckSvnProperty(input_api, output_api,

tests/presubmit_unittest.py

@@ -1069,6 +1069,7 @@ class CannedChecksUnittest(PresubmitTestsBase):
       'CheckChangeHasTestField',
       'CheckChangeLintsClean',
       'CheckChangeSvnEolStyle',
+      'CheckLicense',
       'CheckSvnModifiedDirectories',
       'CheckSvnForCommonMimeTypes', 'CheckSvnProperty',
       'CheckDoNotSubmit',
@@ -1282,6 +1283,66 @@ class CannedChecksUnittest(PresubmitTestsBase):
                          'svn:eol-style', 'LF', '', False,
                          presubmit.OutputApi.PresubmitNotifyResult, True)
 
+  def _LicenseCheck(self, text, license, committing, expected_result):
+    change = self.mox.CreateMock(presubmit.SvnChange)
+    change.scm = 'svn'
+    input_api = self.MockInputApi(change, committing)
+    affected_file = self.mox.CreateMock(presubmit.SvnAffectedFile)
+    input_api.AffectedSourceFiles(42).AndReturn([affected_file])
+    input_api.ReadFile(affected_file, 'rb').AndReturn(text)
+    if expected_result:
+      affected_file.LocalPath().AndReturn('bleh')
+
+    self.mox.ReplayAll()
+    result = presubmit_canned_checks.CheckLicense(
+                 input_api, presubmit.OutputApi, license, 42)
+    if expected_result:
+      self.assertEqual(len(result), 1)
+      self.assertEqual(result[0].__class__, expected_result)
+    else:
+      self.assertEqual(result, [])
+
+  def testCheckLicenseSuccess(self):
+    text = (
+        "#!/bin/python\n"
+        "# Copyright (c) 2037 Nobody.\n"
+        "# All Rights Reserved.\n"
+        "print 'foo'\n"
+    )
+    license = (
+        r".*? Copyright \(c\) 2037 Nobody." "\n"
+        r".*? All Rights Reserved\." "\n"
+    )
+    self._LicenseCheck(text, license, True, None)
+
+  def testCheckLicenseFailCommit(self):
+    text = (
+        "#!/bin/python\n"
+        "# Copyright (c) 2037 Nobody.\n"
+        "# All Rights Reserved.\n"
+        "print 'foo'\n"
+    )
+    license = (
+        r".*? Copyright \(c\) 0007 Nobody." "\n"
+        r".*? All Rights Reserved\." "\n"
+    )
+    self._LicenseCheck(text, license, True,
+                       presubmit.OutputApi.PresubmitPromptWarning)
+
+  def testCheckLicenseFailUpload(self):
+    text = (
+        "#!/bin/python\n"
+        "# Copyright (c) 2037 Nobody.\n"
+        "# All Rights Reserved.\n"
+        "print 'foo'\n"
+    )
+    license = (
+        r".*? Copyright \(c\) 0007 Nobody." "\n"
+        r".*? All Rights Reserved\." "\n"
+    )
+    self._LicenseCheck(text, license, False,
+                       presubmit.OutputApi.PresubmitNotifyResult)
+
   def testCannedCheckSvnAccidentalSubmission(self):
     modified_dir_file = 'foo/'
     accidental_submssion_file = 'foo/bar.cc'