3 # diffconfig - a tool to compare .config files.
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
13 print """Usage: diffconfig [-h] [-m] [<config1> <config2>]
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.
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.
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.
26 If no config files are specified, .config and .config.old are used.
29 $ diffconfig .config config-with-some-changes
34 LOG_BUF_SHIFT 14 -> 16
39 # returns a dictionary of name/value pairs for config items in the file
40 def readconfig(config_file):
42 for line in config_file:
44 if line[:7] == "CONFIG_":
45 name, val = line[7:].split("=", 1)
47 if line[-11:] == " is not set":
51 def print_config(op, config, value, new_value):
57 print "# CONFIG_%s is not set" % config
59 print "CONFIG_%s=%s" % (config, new_value)
62 print "-%s %s" % (config, value)
64 print "+%s %s" % (config, new_value)
66 print " %s %s -> %s" % (config, value, new_value)
71 # parse command line args
72 if ("-h" in sys.argv or "--help" in sys.argv):
81 if not (argc==1 or argc == 3):
82 print "Error: incorrect number of arguments or unrecognized option"
86 # if no filenames given, assume .config and .config.old
88 if os.environ.has_key("KBUILD_OUTPUT"):
89 build_dir = os.environ["KBUILD_OUTPUT"]+"/"
91 configa_filename = build_dir + ".config.old"
92 configb_filename = build_dir + ".config"
94 configa_filename = sys.argv[1]
95 configb_filename = sys.argv[2]
97 a = readconfig(file(configa_filename))
98 b = readconfig(file(configb_filename))
100 # print items in a but not b (accumulate, sort and print)
107 print_config("-", config, a[config], None)
110 # print items that changed (accumulate, sort, and print)
113 if a[config] != b[config]:
114 changed.append(config)
118 for config in changed:
119 print_config("->", config, a[config], b[config])
122 # now print items in b but not in a
123 # (items from b that were in a were removed above)
127 print_config("+", config, None, b[config])