1#!/usr/bin/env python
2#
3# Copyright (C) 2012 The Android Open Source Project
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9#      http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16
17"""
18Prints to stdout the package names that have overlay changes between
19current_overlays.txt and previous_overlays.txt.
20
21Usage: diff_package_overlays.py <current_packages.txt> <current_overlays.txt> <previous_overlays.txt>
22current_packages.txt contains all package names separated by space in the current build.
23This script modfies current_packages.txt if necessary: if there is a package in
24previous_overlays.txt but absent from current_packages.txt, we copy that line
25from previous_overlays.txt over to current_packages.txt. Usually that means we
26just don't care that package in the current build (for example we are switching
27from a full build to a partial build with mm/mmm), and we should carry on the
28previous overlay config so current_overlays.txt always reflects the current
29status of the entire tree.
30
31Format of current_overlays.txt and previous_overlays.txt:
32  <package_name> <resource_overlay> [resource_overlay ...]
33  <package_name> <resource_overlay> [resource_overlay ...]
34  ...
35"""
36
37import sys
38
39def main(argv):
40  if len(argv) != 4:
41    print >> sys.stderr, __doc__
42    sys.exit(1)
43
44  f = open(argv[1])
45  all_packages = set(f.read().split())
46  f.close()
47
48  def load_overlay_config(filename):
49    f = open(filename)
50    result = {}
51    for line in f:
52      line = line.strip()
53      if not line or line.startswith("#"):
54        continue
55      words = line.split()
56      result[words[0]] = " ".join(words[1:])
57    f.close()
58    return result
59
60  current_overlays = load_overlay_config(argv[2])
61  previous_overlays = load_overlay_config(argv[3])
62
63  result = []
64  carryon = []
65  for p in current_overlays:
66    if p not in previous_overlays:
67      result.append(p)
68    elif current_overlays[p] != previous_overlays[p]:
69      result.append(p)
70  for p in previous_overlays:
71    if p not in current_overlays:
72      if p in all_packages:
73        # overlay changed
74        result.append(p)
75      else:
76        # we don't build p in the current build.
77        carryon.append(p)
78
79  # Add carryon to the current overlay config file.
80  if carryon:
81    f = open(argv[2], "a")
82    for p in carryon:
83      f.write(p + " " + previous_overlays[p] + "\n")
84    f.close()
85
86  # Print out the package names that have overlay change.
87  for r in result:
88    print r
89
90if __name__ == "__main__":
91  main(sys.argv)
92