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1#!/usr/bin/env python3
2# Copyright 2019 The Dawn Authors
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#     http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16import argparse, glob, os, sys
17
18
19def check_in_subdirectory(path, directory):
20    return path.startswith(directory) and not '/' in path[len(directory):]
21
22
23def check_is_allowed(path, allowed_dirs):
24    return any(
25        check_in_subdirectory(path, directory) for directory in allowed_dirs)
26
27
28def get_all_files_in_dir(find_directory):
29    result = []
30    for (directory, _, files) in os.walk(find_directory):
31        result += [os.path.join(directory, filename) for filename in files]
32    return result
33
34
35def run():
36    # Parse command line arguments
37    parser = argparse.ArgumentParser(
38        description="Removes stale autogenerated files from gen/ directories.")
39    parser.add_argument(
40        '--root-dir',
41        type=str,
42        help='The root directory, all other paths in files are relative to it.'
43    )
44    parser.add_argument(
45        '--allowed-output-dirs-file',
46        type=str,
47        help='The file containing a list of allowed directories')
48    parser.add_argument(
49        '--stale-dirs-file',
50        type=str,
51        help=
52        'The file containing a list of directories to check for stale files')
53    parser.add_argument('--stamp',
54                        type=str,
55                        help='A stamp written once this script completes')
56    args = parser.parse_args()
57
58    root_dir = args.root_dir
59    stamp_file = args.stamp
60
61    # Load the list of allowed and stale directories
62    with open(args.allowed_output_dirs_file) as f:
63        allowed_dirs = set(
64            [os.path.join(root_dir, line.strip()) for line in f.readlines()])
65
66    for directory in allowed_dirs:
67        if not directory.endswith('/'):
68            print('Allowed directory entry "{}" doesn\'t end with /'.format(
69                directory))
70            return 1
71
72    with open(args.stale_dirs_file) as f:
73        stale_dirs = set([line.strip() for line in f.readlines()])
74
75    # Remove all files in stale dirs that aren't in the allowed dirs.
76    for stale_dir in stale_dirs:
77        stale_dir = os.path.join(root_dir, stale_dir)
78
79        for candidate in get_all_files_in_dir(stale_dir):
80            if not check_is_allowed(candidate, allowed_dirs):
81                os.remove(candidate)
82
83    # Finished! Write the stamp file so ninja knows to not run this again.
84    with open(stamp_file, "w") as f:
85        f.write("")
86
87    return 0
88
89
90if __name__ == "__main__":
91    sys.exit(run())
92