Skip to content
This repository
Fetching contributors…

Cannot retrieve contributors at this time

executable file 129 lines (108 sloc) 3.642 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129
#!/usr/bin/python
#
# diffconfig - a tool to compare .config files.
#
# originally written in 2006 by Matt Mackall
# (at least, this was in his bloatwatch source code)
# last worked on 2008 by Tim Bird
#

import sys, os

def usage():
    print """Usage: diffconfig [-h] [-m] [<config1> <config2>]

Diffconfig is a simple utility for comparing two .config files.
Using standard diff to compare .config files often includes extraneous and
distracting information. This utility produces sorted output with only the
changes in configuration values between the two files.

Added and removed items are shown with a leading plus or minus, respectively.
Changed items show the old and new values on a single line.

If -m is specified, then output will be in "merge" style, which has the
changed and new values in kernel config option format.

If no config files are specified, .config and .config.old are used.

Example usage:
$ diffconfig .config config-with-some-changes
-EXT2_FS_XATTR n
-EXT2_FS_XIP n
CRAMFS n -> y
EXT2_FS y -> n
LOG_BUF_SHIFT 14 -> 16
PRINTK_TIME n -> y
"""
    sys.exit(0)

# returns a dictionary of name/value pairs for config items in the file
def readconfig(config_file):
    d = {}
    for line in config_file:
        line = line[:-1]
        if line[:7] == "CONFIG_":
            name, val = line[7:].split("=", 1)
            d[name] = val
        if line[-11:] == " is not set":
            d[line[9:-11]] = "n"
    return d

def print_config(op, config, value, new_value):
    global merge_style

    if merge_style:
        if new_value:
            if new_value=="n":
                print "# CONFIG_%s is not set" % config
            else:
                print "CONFIG_%s=%s" % (config, new_value)
    else:
        if op=="-":
            print "-%s %s" % (config, value)
        elif op=="+":
            print "+%s %s" % (config, new_value)
        else:
            print " %s %s -> %s" % (config, value, new_value)

def main():
    global merge_style

    # parse command line args
    if ("-h" in sys.argv or "--help" in sys.argv):
usage()

    merge_style = 0
    if "-m" in sys.argv:
        merge_style = 1
        sys.argv.remove("-m")

    argc = len(sys.argv)
    if not (argc==1 or argc == 3):
        print "Error: incorrect number of arguments or unrecognized option"
        usage()

    if argc == 1:
        # if no filenames given, assume .config and .config.old
        build_dir=""
        if os.environ.has_key("KBUILD_OUTPUT"):
            build_dir = os.environ["KBUILD_OUTPUT"]+"/"

        configa_filename = build_dir + ".config.old"
        configb_filename = build_dir + ".config"
    else:
        configa_filename = sys.argv[1]
        configb_filename = sys.argv[2]

    a = readconfig(file(configa_filename))
    b = readconfig(file(configb_filename))

    # print items in a but not b (accumulate, sort and print)
    old = []
    for config in a:
        if config not in b:
            old.append(config)
    old.sort()
    for config in old:
        print_config("-", config, a[config], None)
        del a[config]

    # print items that changed (accumulate, sort, and print)
    changed = []
    for config in a:
        if a[config] != b[config]:
            changed.append(config)
        else:
            del b[config]
    changed.sort()
    for config in changed:
        print_config("->", config, a[config], b[config])
        del b[config]

    # now print items in b but not in a
    # (items from b that were in a were removed above)
    new = b.keys()
    new.sort()
    for config in new:
        print_config("+", config, None, b[config])

main()
Something went wrong with that request. Please try again.