1 files changed, 113 insertions, 0 deletions
diff --git a/build/print_python_deps.py b/build/print_python_deps.py
new file mode 100755
index 0000000000..2459a28e6b
--- /dev/null
+++ b/build/print_python_deps.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env vpython
+# Copyright 2016 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.
+
+"""Prints all non-system dependencies for the given module.
+
+The primary use-case for this script is to genererate the list of python modules
+required for .isolate files.
+"""
+
+import argparse
+import imp
+import os
+import pipes
+import sys
+
+# Don't use any helper modules, or else they will end up in the results.
+
+
+_SRC_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
+
+
+def _ComputePythonDependencies():
+  """Gets the paths of imported non-system python modules.
+
+  A path is assumed to be a "system" import if it is outside of chromium's
+  src/. The paths will be relative to the current directory.
+  """
+  module_paths = (m.__file__ for m in sys.modules.values()
+                  if m and hasattr(m, '__file__'))
+
+  src_paths = set()
+  for path in module_paths:
+    if path == __file__:
+      continue
+    path = os.path.abspath(path)
+    if not path.startswith(_SRC_ROOT):
+      continue
+
+    if (path.endswith('.pyc')
+        or (path.endswith('c') and not os.path.splitext(path)[1])):
+      path = path[:-1]
+    src_paths.add(path)
+
+  return src_paths
+
+
+def _NormalizeCommandLine(options):
+  """Returns a string that when run from SRC_ROOT replicates the command."""
+  args = ['build/print_python_deps.py']
+  root = os.path.relpath(options.root, _SRC_ROOT)
+  if root != '.':
+    args.extend(('--root', root))
+  if options.output:
+    args.extend(('--output', os.path.relpath(options.output, _SRC_ROOT)))
+  for whitelist in sorted(options.whitelists):
+    args.extend(('--whitelist', os.path.relpath(whitelist, _SRC_ROOT)))
+  args.append(os.path.relpath(options.module, _SRC_ROOT))
+  return ' '.join(pipes.quote(x) for x in args)
+
+
+def _FindPythonInDirectory(directory):
+  """Returns an iterable of all non-test python files in the given directory."""
+  files = []
+  for root, _dirnames, filenames in os.walk(directory):
+    for filename in filenames:
+      if filename.endswith('.py') and not filename.endswith('_test.py'):
+        yield os.path.join(root, filename)
+
+
+def main():
+  parser = argparse.ArgumentParser(
+      description='Prints all non-system dependencies for the given module.')
+  parser.add_argument('module',
+                      help='The python module to analyze.')
+  parser.add_argument('--root', default='.',
+                      help='Directory to make paths relative to.')
+  parser.add_argument('--output',
+                      help='Write output to a file rather than stdout.')
+  parser.add_argument('--no-header', action='store_true',
+                      help='Do not write the "# Generated by" header.')
+  parser.add_argument('--gn-paths', action='store_true',
+                      help='Write paths as //foo/bar/baz.py')
+  parser.add_argument('--whitelist', default=[], action='append',
+                      dest='whitelists',
+                      help='Recursively include all non-test python files '
+                      'within this directory. May be specified multiple times.')
+  options = parser.parse_args()
+  # Replace the path entry for print_python_deps.py with the one for the given
+  # module.
+  sys.path[0] = os.path.dirname(options.module)
+  imp.load_source('NAME', options.module)
+
+  paths_set = _ComputePythonDependencies()
+  for path in options.whitelists:
+    paths_set.update(os.path.abspath(p) for p in _FindPythonInDirectory(path))
+
+  paths = [os.path.relpath(p, options.root) for p in paths_set]
+
+  normalized_cmdline = _NormalizeCommandLine(options)
+  out = open(options.output, 'w') if options.output else sys.stdout
+  with out:
+    if not options.no_header:
+      out.write('# Generated by running:\n')
+      out.write('#   %s\n' % normalized_cmdline)
+    prefix = '//' if options.gn_paths else ''
+    for path in sorted(paths):
+      out.write(prefix + path + '\n')
+
+
+if __name__ == '__main__':
+  sys.exit(main())