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#!/usr/bin/env python
# Copyright (c) 2012 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.
"""Wipes out a directory recursively and then touches a stamp file.
This odd pairing of operations is used to support build scripts which
slurp up entire directories (e.g. build/android/javac.py when handling
generated sources) as inputs.
The general pattern of use is:
- Add a target which generates |gen_sources| into |out_path| from |inputs|.
- Include |stamp_file| as an input for that target or any of its rules which
generate files in |out_path|.
- Add an action which depends on |inputs| and which outputs |stamp_file|;
the action should run this script and pass |out_path| and |stamp_file| as
its arguments.
The net result is that you will force |out_path| to be wiped and all
|gen_sources| to be regenerated any time any file in |inputs| changes.
See //mojo/mojom_bindings_generator.gypi for an example use case.
"""
import errno
import os
import shutil
import sys
def Main(dst_dir, stamp_file):
try:
shutil.rmtree(os.path.normpath(dst_dir))
except OSError as e:
# Ignore only "not found" errors.
if e.errno != errno.ENOENT:
raise e
with open(stamp_file, 'a'):
os.utime(stamp_file, None)
if __name__ == '__main__':
sys.exit(Main(sys.argv[1], sys.argv[2]))
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