[Android] Upstream android lint script and run it on debug builders.

build/android/lint.py

Index: build/android/lint.py
diff --git a/build/android/lint.py b/build/android/lint.py
new file mode 100755
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--- /dev/null
+++ b/build/android/lint.py
@@ -0,0 +1,225 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2013 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.
+
+"""Runs Android's lint tool."""
+
+
+import optparse
+import os
+import sys
+import tempfile
+from xml.dom import minidom
+
+from pylib import cmd_helper
+from pylib import constants
+
+
+# Dirs relative to /src to exclude from source linting.
+_EXCLUDE_SRC_DIRS = [
+    'third_party',
+    'out',
+]
+# Dirs relative to out/<type> to exclude from class linting.
+_EXCLUDE_CLASSES_DIRS = [
+    'gen/eyesfree_java',
+]
+_LINT_EXE = os.path.join(constants.ANDROID_SDK_ROOT, 'tools', 'lint')
+_DOC = ('\nSTOP! It looks like you want to suppress some lint errors:\n'
+        '- Have you tried identifing the offending patch?\n'
+        '  Ask the author for a fix and/or revert the patch.\n'
+        '- It is preferred to add suppressions in the code instead of\n'
+        '  sweeping it under the rug here. See:\n'
+        '  http://developer.android.com/tools/debugging/improving-w-lint.html\n'
+        '\n'
+        'Still reading?\n'
+        '- You can edit this file manually to suppress an issue\n'
+        '  globally if it is not applicable to the project.\n'
+        '- You can also rebaseline this file by:\n'
+        '  %s -r\n'
+        '  If the rebaseline is temporary, please make sure there is a bug\n'
+        '  filed and assigned to the author of the offending patch.\n')
+
+
+def _GetClassesDirs():
+  """Get a list of absolute paths to compiled 'classes' directories."""
+  classes_dir = []
+  for dirpath, _, _ in os.walk(constants.GetOutDirectory()):
+    if any([dirpath.startswith(os.path.join(constants.GetOutDirectory(), x)) for
+            x in _EXCLUDE_CLASSES_DIRS]):
+      continue
+    if os.path.basename(dirpath) == 'classes':
+      classes_dir.append(dirpath)
+
+  assert classes_dir, 'Did not find class files. Did you build?'
+  return classes_dir
+
+
+def _GetSrcDirs():
+  """Get a list of absolute paths to Java 'src' directories."""
+  source_dirs = []
+  for dirpath, _, _ in os.walk(constants.DIR_SOURCE_ROOT):
+    if any([dirpath.startswith(os.path.join(constants.DIR_SOURCE_ROOT, x)) for
+            x in _EXCLUDE_SRC_DIRS]):
+      continue
+    if os.path.basename(dirpath) == 'src' and 'java' in dirpath:
+      source_dirs.append(dirpath)
+
+  assert source_dirs, 'Did not find any src directories.'
+  return source_dirs
+
+
+def _Lint(project_path, result_xml_path=None, report_html=False,
+          config_xml_path=None, src_dirs=None, classes_dirs=None):
+  """Execute the lint tool.
+
+  Args:
+    project_path: Absoluate path to the project dir containing the manifest.
+    result_xml_path: Result file generated by lint using --xml.
+    report_html: Whether to generate a pretty html report instead of outputing
+                 to stdout.
+    config_xml_path: Config file passed to lint using --config.
+    src_dirs: List of absolute paths to Java 'src' dirs.
+    classes_dirs: List of absolute paths to 'classes' dirs.
+
+  Returns:
+    Non-zero on failure.
+  """
+
+  cmd = [_LINT_EXE, '-Werror', '--exitcode', '--showall']
+
+  if result_xml_path:
+    cmd.extend(['--xml', result_xml_path])
+
+  if report_html:
+    _, html_path = tempfile.mkstemp(prefix='lint_', suffix='.html')
+    cmd.extend(['--html', html_path])
+
+  if config_xml_path:
+    cmd.extend(['--config', config_xml_path])
+
+  if not src_dirs:
+    src_dirs = _GetSrcDirs()
+  for src in src_dirs:
+    cmd.extend(['--sources', os.path.relpath(src, constants.DIR_SOURCE_ROOT)])
+
+  if not classes_dirs:
+    classes_dirs = _GetClassesDirs()
+  for cls in classes_dirs:
+    if not os.path.isabs(cls):
+      cls = os.path.join(constants.GetOutDirectory(), cls)
+    cmd.extend(['--classpath', os.path.relpath(cls, constants.DIR_SOURCE_ROOT)])
+
+  cmd.append(project_path)
+  return cmd_helper.RunCmd(cmd, cwd=constants.DIR_SOURCE_ROOT)
+
+
+def _Rebaseline(result_xml_path, config_xml_path, script_path):
+  """Create a config file which ignores all lint issues.
+
+  Args:
+    result_xml_path: Result file generated by lint using --xml.
+    config_xml_path: Config file passed to lint using --config.
+    script_path: Absolute path to the script being executed.
+  """
+  dom = minidom.parse(result_xml_path)
+  issues = {}
+  for issue in dom.getElementsByTagName('issue'):
+    issue_id = issue.attributes['id'].value
+    if issue_id not in issues:
+      issues[issue_id] = set()
+    issues[issue_id].add(
+        issue.getElementsByTagName('location')[0].attributes['file'].value)
+
+  # Get a list of globally ignored issues from existing config file.
+  globally_ignored_issues = []
+  if os.path.exists(config_xml_path):
+    dom = minidom.parse(config_xml_path)
+    for issue in dom.getElementsByTagName('issue'):
+      if issue.getAttribute('severity') == 'ignore':
+        globally_ignored_issues.append(issue.attributes['id'].value)
+
+  new_dom = minidom.getDOMImplementation().createDocument(None, 'lint', None)
+  top_element = new_dom.documentElement
+  comment = _DOC % os.path.relpath(script_path, constants.DIR_SOURCE_ROOT)
+  top_element.appendChild(new_dom.createComment(comment))
+  for issue_id, locations in issues.iteritems():
+    issue = new_dom.createElement('issue')
+    issue.attributes['id'] = issue_id
+    if issue_id in globally_ignored_issues:
+      print 'Warning: %s is suppresed globally.' % issue_id
+      issue.attributes['severity'] = 'ignore'
+    else:
+      for loc in locations:
+        ignore = new_dom.createElement('ignore')
+        ignore.attributes['path'] = loc
+        issue.appendChild(ignore)
+    top_element.appendChild(issue)
+
+  with open(config_xml_path, 'w') as f:
+    f.write(new_dom.toprettyxml(indent='  ', encoding='utf-8'))
+
+
+def Run(project_path, config_xml_path, script_path, src_dirs, classes_dirs):
+  """
+  Args:
+    project_path: Absoluate path to the project dir containing the manifest.

[Yaron, 2013/11/15 23:23:47]

Absolute

[frankf, 2013/11/15 23:51:06]

Done.

+    config_xml_path: Config file passed to lint using --config.
+    script_path: Absolute path to the script being executed.
+    src_dirs: List of absolute paths to Java 'src' dirs.
+    classes_dirs: List of absolute paths to 'classes' dirs.
+
+  Returns:
+    Non-zero on failure.
+  """
+  assert os.path.exists(project_path), 'No such project path: %s' % project_path
+
+  parser = optparse.OptionParser()
+  parser.add_option('-r', '--rebaseline',

[Yaron, 2013/11/15 23:23:47]

I think it'd be worth making the default project and paths to srcs as input
params. That way you can re-use the script downstream instead of having two
versions.

+                    action='store_true',
+                    help='Rebaseline existing lint issues.')
+  parser.add_option('--release',
+                    action='store_true',
+                    help='Whether this is a Release build.')
+  parser.add_option('--html',
+                    action='store_true',
+                    help='Generate a html report instead of writing to stdout.')
+  options, _ = parser.parse_args()
+
+  if options.release:
+    constants.SetBuildType('Release')
+  else:
+    constants.SetBuildType('Debug')
+
+  rc = 0
+  if options.rebaseline:
+    result_xml_path = tempfile.NamedTemporaryFile()
+    _Lint(project_path, result_xml_path=result_xml_path.name, src_dirs=src_dirs,
+          classes_dirs=classes_dirs)
+    _Rebaseline(result_xml_path.name, config_xml_path, script_path)
+    print 'Updated %s' % config_xml_path
+  else:
+    rc = _Lint(project_path, report_html=options.html,
+               config_xml_path=config_xml_path, src_dirs=src_dirs,
+               classes_dirs=classes_dirs)
+    if rc:
+      print ('\nWanna suppress errors? Refer to %s' %
+             os.path.relpath(config_xml_path, constants.DIR_SOURCE_ROOT))
+
+  return rc
+
+
+def main(argv):
+  project_path = os.path.join(constants.DIR_SOURCE_ROOT, 'chrome', 'android',
+                              'testshell', 'java')
+  script_path = os.path.abspath(__file__)
+  config_xml_path = os.path.join(os.path.dirname(script_path),
+                                 'lint_suppressions.xml')
+
+  return Run(project_path, config_xml_path, script_path, None, None)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))