1 #!/usr/bin/env python3 !! 1 #!/usr/bin/python
2 # SPDX-License-Identifier: GPL-2.0 <<
3 # 2 #
4 # diffconfig - a tool to compare .config files 3 # diffconfig - a tool to compare .config files.
5 # 4 #
6 # originally written in 2006 by Matt Mackall 5 # originally written in 2006 by Matt Mackall
7 # (at least, this was in his bloatwatch sourc 6 # (at least, this was in his bloatwatch source code)
8 # last worked on 2008 by Tim Bird 7 # last worked on 2008 by Tim Bird
9 # 8 #
10 9
11 import sys, os 10 import sys, os
12 11
13 def usage(): 12 def usage():
14 print("""Usage: diffconfig [-h] [-m] [<con 13 print("""Usage: diffconfig [-h] [-m] [<config1> <config2>]
15 14
16 Diffconfig is a simple utility for comparing t 15 Diffconfig is a simple utility for comparing two .config files.
17 Using standard diff to compare .config files o 16 Using standard diff to compare .config files often includes extraneous and
18 distracting information. This utility produce 17 distracting information. This utility produces sorted output with only the
19 changes in configuration values between the tw 18 changes in configuration values between the two files.
20 19
21 Added and removed items are shown with a leadi 20 Added and removed items are shown with a leading plus or minus, respectively.
22 Changed items show the old and new values on a 21 Changed items show the old and new values on a single line.
23 22
24 If -m is specified, then output will be in "me 23 If -m is specified, then output will be in "merge" style, which has the
25 changed and new values in kernel config option 24 changed and new values in kernel config option format.
26 25
27 If no config files are specified, .config and 26 If no config files are specified, .config and .config.old are used.
28 27
29 Example usage: 28 Example usage:
30 $ diffconfig .config config-with-some-changes 29 $ diffconfig .config config-with-some-changes
31 -EXT2_FS_XATTR n 30 -EXT2_FS_XATTR n
32 CRAMFS n -> y 31 CRAMFS n -> y
33 EXT2_FS y -> n 32 EXT2_FS y -> n
34 LOG_BUF_SHIFT 14 -> 16 33 LOG_BUF_SHIFT 14 -> 16
35 PRINTK_TIME n -> y 34 PRINTK_TIME n -> y
36 """) 35 """)
37 sys.exit(0) 36 sys.exit(0)
38 37
39 # returns a dictionary of name/value pairs for 38 # returns a dictionary of name/value pairs for config items in the file
40 def readconfig(config_file): 39 def readconfig(config_file):
41 d = {} 40 d = {}
42 for line in config_file: 41 for line in config_file:
43 line = line[:-1] 42 line = line[:-1]
44 if line[:7] == "CONFIG_": 43 if line[:7] == "CONFIG_":
45 name, val = line[7:].split("=", 1) 44 name, val = line[7:].split("=", 1)
46 d[name] = val 45 d[name] = val
47 if line[-11:] == " is not set": 46 if line[-11:] == " is not set":
48 d[line[9:-11]] = "n" 47 d[line[9:-11]] = "n"
49 return d 48 return d
50 49
51 def print_config(op, config, value, new_value) 50 def print_config(op, config, value, new_value):
52 global merge_style 51 global merge_style
53 52
54 if merge_style: 53 if merge_style:
55 if new_value: 54 if new_value:
56 if new_value=="n": 55 if new_value=="n":
57 print("# CONFIG_%s is not set" 56 print("# CONFIG_%s is not set" % config)
58 else: 57 else:
59 print("CONFIG_%s=%s" % (config 58 print("CONFIG_%s=%s" % (config, new_value))
60 else: 59 else:
61 if op=="-": 60 if op=="-":
62 print("-%s %s" % (config, value)) 61 print("-%s %s" % (config, value))
63 elif op=="+": 62 elif op=="+":
64 print("+%s %s" % (config, new_valu 63 print("+%s %s" % (config, new_value))
65 else: 64 else:
66 print(" %s %s -> %s" % (config, va 65 print(" %s %s -> %s" % (config, value, new_value))
67 66
68 def show_diff(): !! 67 def main():
69 global merge_style 68 global merge_style
70 69
71 # parse command line args 70 # parse command line args
72 if ("-h" in sys.argv or "--help" in sys.ar 71 if ("-h" in sys.argv or "--help" in sys.argv):
73 usage() 72 usage()
74 73
75 merge_style = 0 74 merge_style = 0
76 if "-m" in sys.argv: 75 if "-m" in sys.argv:
77 merge_style = 1 76 merge_style = 1
78 sys.argv.remove("-m") 77 sys.argv.remove("-m")
79 78
80 argc = len(sys.argv) 79 argc = len(sys.argv)
81 if not (argc==1 or argc == 3): 80 if not (argc==1 or argc == 3):
82 print("Error: incorrect number of argu 81 print("Error: incorrect number of arguments or unrecognized option")
83 usage() 82 usage()
84 83
85 if argc == 1: 84 if argc == 1:
86 # if no filenames given, assume .confi 85 # if no filenames given, assume .config and .config.old
87 build_dir="" 86 build_dir=""
88 if "KBUILD_OUTPUT" in os.environ: 87 if "KBUILD_OUTPUT" in os.environ:
89 build_dir = os.environ["KBUILD_OUT 88 build_dir = os.environ["KBUILD_OUTPUT"]+"/"
90 configa_filename = build_dir + ".confi 89 configa_filename = build_dir + ".config.old"
91 configb_filename = build_dir + ".confi 90 configb_filename = build_dir + ".config"
92 else: 91 else:
93 configa_filename = sys.argv[1] 92 configa_filename = sys.argv[1]
94 configb_filename = sys.argv[2] 93 configb_filename = sys.argv[2]
95 94
96 try: 95 try:
97 a = readconfig(open(configa_filename)) 96 a = readconfig(open(configa_filename))
98 b = readconfig(open(configb_filename)) 97 b = readconfig(open(configb_filename))
99 except (IOError): 98 except (IOError):
100 e = sys.exc_info()[1] 99 e = sys.exc_info()[1]
101 print("I/O error[%s]: %s\n" % (e.args[ 100 print("I/O error[%s]: %s\n" % (e.args[0],e.args[1]))
102 usage() 101 usage()
103 102
104 # print items in a but not b (accumulate, 103 # print items in a but not b (accumulate, sort and print)
105 old = [] 104 old = []
106 for config in a: 105 for config in a:
107 if config not in b: 106 if config not in b:
108 old.append(config) 107 old.append(config)
109 old.sort() 108 old.sort()
110 for config in old: 109 for config in old:
111 print_config("-", config, a[config], N 110 print_config("-", config, a[config], None)
112 del a[config] 111 del a[config]
113 112
114 # print items that changed (accumulate, so 113 # print items that changed (accumulate, sort, and print)
115 changed = [] 114 changed = []
116 for config in a: 115 for config in a:
117 if a[config] != b[config]: 116 if a[config] != b[config]:
118 changed.append(config) 117 changed.append(config)
119 else: 118 else:
120 del b[config] 119 del b[config]
121 changed.sort() 120 changed.sort()
122 for config in changed: 121 for config in changed:
123 print_config("->", config, a[config], 122 print_config("->", config, a[config], b[config])
124 del b[config] 123 del b[config]
125 124
126 # now print items in b but not in a 125 # now print items in b but not in a
127 # (items from b that were in a were remove 126 # (items from b that were in a were removed above)
128 new = sorted(b.keys()) 127 new = sorted(b.keys())
129 for config in new: 128 for config in new:
130 print_config("+", config, None, b[conf 129 print_config("+", config, None, b[config])
131 130
132 def main(): !! 131 main()
133 try: <<
134 show_diff() <<
135 except BrokenPipeError: <<
136 # Python flushes standard streams on e <<
137 # to devnull to avoid another BrokenPi <<
138 devnull = os.open(os.devnull, os.O_WRO <<
139 os.dup2(devnull, sys.stdout.fileno()) <<
140 sys.exit(1) # Python exits with error <<
141 <<
142 <<
143 if __name__ == '__main__': <<
144 main() <<
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