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1 #!/usr/bin/python
2 #
3 # diffconfig - a tool to compare .config files.
4 #
5 # originally written in 2006 by Matt Mackall
6 # (at least, this was in his bloatwatch source code)
7 # last worked on 2008 by Tim Bird
8 #
9
10 import sys, os
11
12 def usage():
13 print("""Usage: diffconfig [-h] [-m] [<config1> <config2>]
14
15 Diffconfig is a simple utility for comparing two .config files.
16 Using standard diff to compare .config files often includes extraneous and
17 distracting information. This utility produces sorted output with only the
18 changes in configuration values between the two files.
19
20 Added and removed items are shown with a leading plus or minus, respectively.
21 Changed items show the old and new values on a single line.
22
23 If -m is specified, then output will be in "merge" style, which has the
24 changed and new values in kernel config option format.
25
26 If no config files are specified, .config and .config.old are used.
27
28 Example usage:
29 $ diffconfig .config config-with-some-changes
30 -EXT2_FS_XATTR n
31 CRAMFS n -> y
32 EXT2_FS y -> n
33 LOG_BUF_SHIFT 14 -> 16
34 PRINTK_TIME n -> y
35 """)
36 sys.exit(0)
37
38 # returns a dictionary of name/value pairs for config items in the file
39 def readconfig(config_file):
40 d = {}
41 for line in config_file:
42 line = line[:-1]
43 if line[:7] == "CONFIG_":
44 name, val = line[7:].split("=", 1)
45 d[name] = val
46 if line[-11:] == " is not set":
47 d[line[9:-11]] = "n"
48 return d
49
50 def print_config(op, config, value, new_value):
51 global merge_style
52
53 if merge_style:
54 if new_value:
55 if new_value=="n":
56 print("# CONFIG_%s is not set" % config)
57 else:
58 print("CONFIG_%s=%s" % (config, new_value))
59 else:
60 if op=="-":
61 print("-%s %s" % (config, value))
62 elif op=="+":
63 print("+%s %s" % (config, new_value))
64 else:
65 print(" %s %s -> %s" % (config, value, new_value))
66
67 def main():
68 global merge_style
69
70 # parse command line args
71 if ("-h" in sys.argv or "--help" in sys.argv):
72 usage()
73
74 merge_style = 0
75 if "-m" in sys.argv:
76 merge_style = 1
77 sys.argv.remove("-m")
78
79 argc = len(sys.argv)
80 if not (argc==1 or argc == 3):
81 print("Error: incorrect number of arguments or unrecognized option")
82 usage()
83
84 if argc == 1:
85 # if no filenames given, assume .config and .config.old
86 build_dir=""
87 if "KBUILD_OUTPUT" in os.environ:
88 build_dir = os.environ["KBUILD_OUTPUT"]+"/"
89 configa_filename = build_dir + ".config.old"
90 configb_filename = build_dir + ".config"
91 else:
92 configa_filename = sys.argv[1]
93 configb_filename = sys.argv[2]
94
95 try:
96 a = readconfig(open(configa_filename))
97 b = readconfig(open(configb_filename))
98 except (IOError):
99 e = sys.exc_info()[1]
100 print("I/O error[%s]: %s\n" % (e.args[0],e.args[1]))
101 usage()
102
103 # print items in a but not b (accumulate, sort and print)
104 old = []
105 for config in a:
106 if config not in b:
107 old.append(config)
108 old.sort()
109 for config in old:
110 print_config("-", config, a[config], None)
111 del a[config]
112
113 # print items that changed (accumulate, sort, and print)
114 changed = []
115 for config in a:
116 if a[config] != b[config]:
117 changed.append(config)
118 else:
119 del b[config]
120 changed.sort()
121 for config in changed:
122 print_config("->", config, a[config], b[config])
123 del b[config]
124
125 # now print items in b but not in a
126 # (items from b that were in a were removed above)
127 new = sorted(b.keys())
128 for config in new:
129 print_config("+", config, None, b[config])
130
131 main()