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Tim Birda7174172008-06-24 10:56:06 -07001#!/usr/bin/python
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01002# SPDX-License-Identifier: GPL-2.0
Tim Birda7174172008-06-24 10:56:06 -07003#
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 source code)
8# last worked on 2008 by Tim Bird
9#
10
11import sys, os
12
13def usage():
Mike Paganoc8272fa2013-08-20 14:41:12 -040014 print("""Usage: diffconfig [-h] [-m] [<config1> <config2>]
Tim Birda7174172008-06-24 10:56:06 -070015
16Diffconfig is a simple utility for comparing two .config files.
17Using standard diff to compare .config files often includes extraneous and
18distracting information. This utility produces sorted output with only the
19changes in configuration values between the two files.
20
21Added and removed items are shown with a leading plus or minus, respectively.
22Changed items show the old and new values on a single line.
23
24If -m is specified, then output will be in "merge" style, which has the
25changed and new values in kernel config option format.
26
27If no config files are specified, .config and .config.old are used.
28
29Example usage:
30 $ diffconfig .config config-with-some-changes
31-EXT2_FS_XATTR n
Tim Birda7174172008-06-24 10:56:06 -070032 CRAMFS n -> y
33 EXT2_FS y -> n
34 LOG_BUF_SHIFT 14 -> 16
35 PRINTK_TIME n -> y
Mike Paganoc8272fa2013-08-20 14:41:12 -040036""")
Tim Birda7174172008-06-24 10:56:06 -070037 sys.exit(0)
38
39# returns a dictionary of name/value pairs for config items in the file
40def 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
51def 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":
Mike Paganoc8272fa2013-08-20 14:41:12 -040057 print("# CONFIG_%s is not set" % config)
Tim Birda7174172008-06-24 10:56:06 -070058 else:
Mike Paganoc8272fa2013-08-20 14:41:12 -040059 print("CONFIG_%s=%s" % (config, new_value))
Tim Birda7174172008-06-24 10:56:06 -070060 else:
61 if op=="-":
Mike Paganoc8272fa2013-08-20 14:41:12 -040062 print("-%s %s" % (config, value))
Tim Birda7174172008-06-24 10:56:06 -070063 elif op=="+":
Mike Paganoc8272fa2013-08-20 14:41:12 -040064 print("+%s %s" % (config, new_value))
Tim Birda7174172008-06-24 10:56:06 -070065 else:
Mike Paganoc8272fa2013-08-20 14:41:12 -040066 print(" %s %s -> %s" % (config, value, new_value))
Tim Birda7174172008-06-24 10:56:06 -070067
68def main():
69 global merge_style
70
71 # parse command line args
72 if ("-h" in sys.argv or "--help" in sys.argv):
Mike Paganoc8272fa2013-08-20 14:41:12 -040073 usage()
Tim Birda7174172008-06-24 10:56:06 -070074
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):
Mike Paganoc8272fa2013-08-20 14:41:12 -040082 print("Error: incorrect number of arguments or unrecognized option")
Tim Birda7174172008-06-24 10:56:06 -070083 usage()
84
85 if argc == 1:
86 # if no filenames given, assume .config and .config.old
87 build_dir=""
Mike Paganoc8272fa2013-08-20 14:41:12 -040088 if "KBUILD_OUTPUT" in os.environ:
Tim Birda7174172008-06-24 10:56:06 -070089 build_dir = os.environ["KBUILD_OUTPUT"]+"/"
Tim Birda7174172008-06-24 10:56:06 -070090 configa_filename = build_dir + ".config.old"
91 configb_filename = build_dir + ".config"
92 else:
93 configa_filename = sys.argv[1]
94 configb_filename = sys.argv[2]
95
Mike Pagano6bf2e842013-08-16 14:40:56 -040096 try:
Mike Paganoc8272fa2013-08-20 14:41:12 -040097 a = readconfig(open(configa_filename))
98 b = readconfig(open(configb_filename))
Mike Pagano6bf2e842013-08-16 14:40:56 -040099 except (IOError):
100 e = sys.exc_info()[1]
101 print("I/O error[%s]: %s\n" % (e.args[0],e.args[1]))
102 usage()
Tim Birda7174172008-06-24 10:56:06 -0700103
104 # print items in a but not b (accumulate, sort and print)
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], None)
112 del a[config]
113
114 # print items that changed (accumulate, sort, and print)
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], b[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 removed above)
Mike Paganoc8272fa2013-08-20 14:41:12 -0400128 new = sorted(b.keys())
Tim Birda7174172008-06-24 10:56:06 -0700129 for config in new:
130 print_config("+", config, None, b[config])
131
132main()