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 10import sys, os 11 12def usage(): 13 print """Usage: diffconfig [-h] [-m] [<config1> <config2>] 14 15Diffconfig is a simple utility for comparing two .config files. 16Using standard diff to compare .config files often includes extraneous and 17distracting information. This utility produces sorted output with only the 18changes in configuration values between the two files. 19 20Added and removed items are shown with a leading plus or minus, respectively. 21Changed items show the old and new values on a single line. 22 23If -m is specified, then output will be in "merge" style, which has the 24changed and new values in kernel config option format. 25 26If no config files are specified, .config and .config.old are used. 27 28Example usage: 29 $ diffconfig .config config-with-some-changes 30-EXT2_FS_XATTR n 31-EXT2_FS_XIP 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 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": 57 print "# CONFIG_%s is not set" % config 58 else: 59 print "CONFIG_%s=%s" % (config, new_value) 60 else: 61 if op=="-": 62 print "-%s %s" % (config, value) 63 elif op=="+": 64 print "+%s %s" % (config, new_value) 65 else: 66 print " %s %s -> %s" % (config, value, new_value) 67 68def main(): 69 global merge_style 70 71 # parse command line args 72 if ("-h" in sys.argv or "--help" in sys.argv): 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 arguments or unrecognized option" 83 usage() 84 85 if argc == 1: 86 # if no filenames given, assume .config and .config.old 87 build_dir="" 88 if os.environ.has_key("KBUILD_OUTPUT"): 89 build_dir = os.environ["KBUILD_OUTPUT"]+"/" 90 91 configa_filename = build_dir + ".config.old" 92 configb_filename = build_dir + ".config" 93 else: 94 configa_filename = sys.argv[1] 95 configb_filename = sys.argv[2] 96 97 try: 98 a = readconfig(file(configa_filename)) 99 b = readconfig(file(configb_filename)) 100 except (IOError): 101 e = sys.exc_info()[1] 102 print("I/O error[%s]: %s\n" % (e.args[0],e.args[1])) 103 usage() 104 105 # print items in a but not b (accumulate, sort and print) 106 old = [] 107 for config in a: 108 if config not in b: 109 old.append(config) 110 old.sort() 111 for config in old: 112 print_config("-", config, a[config], None) 113 del a[config] 114 115 # print items that changed (accumulate, sort, and print) 116 changed = [] 117 for config in a: 118 if a[config] != b[config]: 119 changed.append(config) 120 else: 121 del b[config] 122 changed.sort() 123 for config in changed: 124 print_config("->", config, a[config], b[config]) 125 del b[config] 126 127 # now print items in b but not in a 128 # (items from b that were in a were removed above) 129 new = b.keys() 130 new.sort() 131 for config in new: 132 print_config("+", config, None, b[config]) 133 134main() 135