145 lines
4.1 KiB
Python
Executable File
145 lines
4.1 KiB
Python
Executable File
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0
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#
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# diffconfig - a tool to compare .config files.
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#
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# originally written in 2006 by Matt Mackall
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# (at least, this was in his bloatwatch source code)
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# last worked on 2008 by Tim Bird
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#
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import sys, os
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def usage():
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print("""Usage: diffconfig [-h] [-m] [<config1> <config2>]
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Diffconfig is a simple utility for comparing two .config files.
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Using standard diff to compare .config files often includes extraneous and
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distracting information. This utility produces sorted output with only the
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changes in configuration values between the two files.
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Added and removed items are shown with a leading plus or minus, respectively.
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Changed items show the old and new values on a single line.
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If -m is specified, then output will be in "merge" style, which has the
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changed and new values in kernel config option format.
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If no config files are specified, .config and .config.old are used.
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Example usage:
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$ diffconfig .config config-with-some-changes
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-EXT2_FS_XATTR n
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CRAMFS n -> y
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EXT2_FS y -> n
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LOG_BUF_SHIFT 14 -> 16
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PRINTK_TIME n -> y
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""")
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sys.exit(0)
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# returns a dictionary of name/value pairs for config items in the file
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def readconfig(config_file):
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d = {}
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for line in config_file:
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line = line[:-1]
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if line[:7] == "CONFIG_":
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name, val = line[7:].split("=", 1)
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d[name] = val
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if line[-11:] == " is not set":
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d[line[9:-11]] = "n"
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return d
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def print_config(op, config, value, new_value):
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global merge_style
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if merge_style:
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if new_value:
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if new_value=="n":
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print("# CONFIG_%s is not set" % config)
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else:
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print("CONFIG_%s=%s" % (config, new_value))
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else:
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if op=="-":
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print("-%s %s" % (config, value))
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elif op=="+":
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print("+%s %s" % (config, new_value))
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else:
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print(" %s %s -> %s" % (config, value, new_value))
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def show_diff():
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global merge_style
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# parse command line args
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if ("-h" in sys.argv or "--help" in sys.argv):
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usage()
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merge_style = 0
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if "-m" in sys.argv:
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merge_style = 1
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sys.argv.remove("-m")
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argc = len(sys.argv)
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if not (argc==1 or argc == 3):
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print("Error: incorrect number of arguments or unrecognized option")
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usage()
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if argc == 1:
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# if no filenames given, assume .config and .config.old
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build_dir=""
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if "KBUILD_OUTPUT" in os.environ:
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build_dir = os.environ["KBUILD_OUTPUT"]+"/"
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configa_filename = build_dir + ".config.old"
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configb_filename = build_dir + ".config"
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else:
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configa_filename = sys.argv[1]
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configb_filename = sys.argv[2]
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try:
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a = readconfig(open(configa_filename))
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b = readconfig(open(configb_filename))
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except (IOError):
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e = sys.exc_info()[1]
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print("I/O error[%s]: %s\n" % (e.args[0],e.args[1]))
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usage()
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# print items in a but not b (accumulate, sort and print)
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old = []
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for config in a:
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if config not in b:
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old.append(config)
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old.sort()
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for config in old:
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print_config("-", config, a[config], None)
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del a[config]
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# print items that changed (accumulate, sort, and print)
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changed = []
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for config in a:
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if a[config] != b[config]:
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changed.append(config)
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else:
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del b[config]
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changed.sort()
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for config in changed:
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print_config("->", config, a[config], b[config])
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del b[config]
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# now print items in b but not in a
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# (items from b that were in a were removed above)
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new = sorted(b.keys())
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for config in new:
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print_config("+", config, None, b[config])
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def main():
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try:
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show_diff()
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except BrokenPipeError:
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# Python flushes standard streams on exit; redirect remaining output
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# to devnull to avoid another BrokenPipeError at shutdown
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devnull = os.open(os.devnull, os.O_WRONLY)
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os.dup2(devnull, sys.stdout.fileno())
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sys.exit(1) # Python exits with error code 1 on EPIPE
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if __name__ == '__main__':
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main()
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