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129 lines
3.6 KiB
129 lines
3.6 KiB
#!/usr/bin/python |
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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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-EXT2_FS_XIP 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 main(): |
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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 os.environ.has_key("KBUILD_OUTPUT"): |
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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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a = readconfig(file(configa_filename)) |
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b = readconfig(file(configb_filename)) |
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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 = b.keys() |
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new.sort() |
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for config in new: |
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print_config("+", config, None, b[config]) |
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main()
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