script/compare_cc_results: print usage on too few args
[samba.git] / script / compare_cc_results.py
1 #!/usr/bin/env python3
2 """Compare the results of native and cross-compiled configure tests
3
4 The compared files are called "default.cache.py" and are generated in
5 bin/c4che/.
6
7 USAGE: compare_cc_results.py CONFIG_1 CONFIG_2 [CONFIG_3 [CONFIG_4 ...]]
8 """
9 from __future__ import print_function
10 import sys
11 import difflib
12
13 exceptions = [
14     'BUILD_DIRECTORY', 'SELFTEST_PREFIX', 'defines',
15     'CROSS_COMPILE', 'CROSS_ANSWERS', 'CROSS_EXECUTE',
16     'LIBSOCKET_WRAPPER_SO_PATH',
17     'LIBNSS_WRAPPER_SO_PATH',
18     'LIBPAM_WRAPPER_SO_PATH',
19     'PAM_SET_ITEMS_SO_PATH',
20     'LIBUID_WRAPPER_SO_PATH',
21     'LIBRESOLV_WRAPPER_SO_PATH',
22 ]
23
24 if len(sys.argv) < 3:
25     print(__doc__)
26     sys.exit(1)
27
28 base_lines = list()
29 base_fname = ''
30
31 found_diff = False
32
33 for fname in sys.argv[1:]:
34     lines = list()
35     f = open(fname, 'r')
36     for line in f:
37         if line.startswith("cfg_files ="):
38             # waf writes configuration files as absolute paths
39             continue
40         if len(line.split('=', 1)) == 2:
41             key = line.split('=', 1)[0].strip()
42             value = line.split('=', 1)[1].strip()
43             if key in exceptions:
44                 continue
45             # using waf with python 3.4 seems to randomly sort dict keys
46             # we can't modify the waf code but we can fake a dict value
47             # string representation as if it were sorted. python 3.6.5
48             # doesn't seem to suffer from this behaviour
49             if value.startswith('{'):
50                 import ast
51                 amap = ast.literal_eval(value)
52                 fakeline = ""
53                 for k in sorted(amap.keys()):
54                     if not len(fakeline) == 0:
55                         fakeline = fakeline + ", "
56                     fakeline = fakeline + '\'' + k + '\': \'' + amap[k] + '\''
57                 line = key + ' = {' + fakeline + '}'
58         lines.append(line)
59     f.close()
60     if base_fname:
61         diff = list(difflib.unified_diff(base_lines, lines, base_fname, fname))
62         if diff:
63             print('configuration files %s and %s do not match' % (base_fname, fname))
64             for l in diff:
65                 sys.stdout.write(l)
66             found_diff = True
67     else:
68         base_fname = fname
69         base_lines = lines
70
71 if found_diff:
72     sys.exit(1)