1 #!/usr/bin/env python3
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # diffconfig - a tool to compare .config files
5 #
6 # originally written in 2006 by Matt Mackall
7 # (at least, this was in his bloatwatch sourc
8 # last worked on 2008 by Tim Bird
9 #
10
11 import sys, os
12
13 def usage():
14 print("""Usage: diffconfig [-h] [-m] [<con
15
16 Diffconfig is a simple utility for comparing t
17 Using standard diff to compare .config files o
18 distracting information. This utility produce
19 changes in configuration values between the tw
20
21 Added and removed items are shown with a leadi
22 Changed items show the old and new values on a
23
24 If -m is specified, then output will be in "me
25 changed and new values in kernel config option
26
27 If no config files are specified, .config and
28
29 Example usage:
30 $ diffconfig .config config-with-some-changes
31 -EXT2_FS_XATTR n
32 CRAMFS n -> y
33 EXT2_FS y -> n
34 LOG_BUF_SHIFT 14 -> 16
35 PRINTK_TIME n -> y
36 """)
37 sys.exit(0)
38
39 # returns a dictionary of name/value pairs for
40 def readconfig(config_file):
41 d = {}
42 for line in config_file:
43 line = line[:-1]
44 if line[:7] == "CONFIG_":
45 name, val = line[7:].split("=", 1)
46 d[name] = val
47 if line[-11:] == " is not set":
48 d[line[9:-11]] = "n"
49 return d
50
51 def print_config(op, config, value, new_value)
52 global merge_style
53
54 if merge_style:
55 if new_value:
56 if new_value=="n":
57 print("# CONFIG_%s is not set"
58 else:
59 print("CONFIG_%s=%s" % (config
60 else:
61 if op=="-":
62 print("-%s %s" % (config, value))
63 elif op=="+":
64 print("+%s %s" % (config, new_valu
65 else:
66 print(" %s %s -> %s" % (config, va
67
68 def show_diff():
69 global merge_style
70
71 # parse command line args
72 if ("-h" in sys.argv or "--help" in sys.ar
73 usage()
74
75 merge_style = 0
76 if "-m" in sys.argv:
77 merge_style = 1
78 sys.argv.remove("-m")
79
80 argc = len(sys.argv)
81 if not (argc==1 or argc == 3):
82 print("Error: incorrect number of argu
83 usage()
84
85 if argc == 1:
86 # if no filenames given, assume .confi
87 build_dir=""
88 if "KBUILD_OUTPUT" in os.environ:
89 build_dir = os.environ["KBUILD_OUT
90 configa_filename = build_dir + ".confi
91 configb_filename = build_dir + ".confi
92 else:
93 configa_filename = sys.argv[1]
94 configb_filename = sys.argv[2]
95
96 try:
97 a = readconfig(open(configa_filename))
98 b = readconfig(open(configb_filename))
99 except (IOError):
100 e = sys.exc_info()[1]
101 print("I/O error[%s]: %s\n" % (e.args[
102 usage()
103
104 # print items in a but not b (accumulate,
105 old = []
106 for config in a:
107 if config not in b:
108 old.append(config)
109 old.sort()
110 for config in old:
111 print_config("-", config, a[config], N
112 del a[config]
113
114 # print items that changed (accumulate, so
115 changed = []
116 for config in a:
117 if a[config] != b[config]:
118 changed.append(config)
119 else:
120 del b[config]
121 changed.sort()
122 for config in changed:
123 print_config("->", config, a[config],
124 del b[config]
125
126 # now print items in b but not in a
127 # (items from b that were in a were remove
128 new = sorted(b.keys())
129 for config in new:
130 print_config("+", config, None, b[conf
131
132 def main():
133 try:
134 show_diff()
135 except BrokenPipeError:
136 # Python flushes standard streams on e
137 # to devnull to avoid another BrokenPi
138 devnull = os.open(os.devnull, os.O_WRO
139 os.dup2(devnull, sys.stdout.fileno())
140 sys.exit(1) # Python exits with error
141
142
143 if __name__ == '__main__':
144 main()
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