Script to extract components from OWNERS files throughout the repo.

tools/checkteamtags/extract_components.py

Index: tools/checkteamtags/extract_components.py
diff --git a/tools/checkteamtags/extract_components.py b/tools/checkteamtags/extract_components.py
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+++ b/tools/checkteamtags/extract_components.py
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+#!/usr/bin/env python
+# Copyright (c) 2017 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.
+
+"""Parses OWNERS recursively and generates a machine readable component mapping.
+
+OWNERS files are expected to contain a well-formatted pair of tags as shown
+below.  A presubmit check exists that validates this.
+
+This script finds lines in the OWNERS files such as:
+  `# TEAM: team@chromium.org` and
+  `# COMPONENT: Tools>Test>Findit`
+and dumps this information into a json file.
+
+Refer to crbug.com/667952
+"""
+
+import json
+import optparse
+import os
+import sys
+
+from owners_file_tags import aggregate_components_from_owners
+
+
+_DEFAULT_SRC_LOCATION = os.path.join(
+    os.path.dirname(__file__), os.pardir, os.pardir)
+
+_README = """
+This file is generated by src/tools/checkteamtags/extract_components.py
+by parsing the contents of OWNERS files throughout the chromium source code and
+extracting `# TEAM:` and `# COMPONENT:` tags.
+
+Manual edits of this file will be overwritten by an automated process.
+""".splitlines()
+
+
+def write_results(filename, data):
+  """Write data to the named file, or the default location."""
+  if not filename:
+    filename = 'component_map.json'
+  with open(filename, 'w') as f:
+    f.write(data)
+
+
+def main(argv):
+  usage = """Usage: python %prog [options] [<root_dir>]
+  root_dir  specifies the topmost directory to traverse looking for OWNERS
+            files, defaults to two levels up from this file's directory.
+            i.e. where src/ is expected to be.
+
+Examples:
+  python %prog
+  python %prog /b/build/src
+  python %prog -v /b/build/src
+  python %prog -w /b/build/src
+  python %prog -o ~/components.json /b/build/src
+  """
+  parser = optparse.OptionParser(usage=usage)
+  parser.add_option('-w', '--write', action='store_true',
+                    help='If no errors occur, write the mappings to disk.')
+  parser.add_option('-v', '--verbose', action='store_true',
+                    help='Print warnings.')
+  parser.add_option('-f', '--force_print', action='store_true',
+                    help='Print the mappings despite errors.')
+  parser.add_option('-o', '--output_file', help='Specify file to write the '
+                    'mappings to instead of the default: <CWD>/'
+                    'component_map.json (implies -w)')
+  options, args = parser.parse_args(argv[1:])
+  if args:
+    root = args[0]
+  else:
+    root = _DEFAULT_SRC_LOCATION
+
+  mappings, warnings, errors = aggregate_components_from_owners(root)
+  if options.verbose:
+    for w in warnings:
+      print w
+
+  for e in errors:
+    print e
+
+  mappings['AAA-README']= _README
+  mapping_file_contents = json.dumps(mappings, sort_keys=True, indent=2)
+  if options.write or options.output_file:
+    if errors:
+      print 'Not writing to file due to errors'
+      if options.force_print:
+        print mapping_file_contents
+    else:
+      write_results(options.output_file, mapping_file_contents)
+  else:
+    print mapping_file_contents
+
+  return len(errors)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))