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