diff options
| -rwxr-xr-x | scripts/xattr_user_crc32 | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/scripts/xattr_user_crc32 b/scripts/xattr_user_crc32 index a13840f..8f47bdd 100755 --- a/scripts/xattr_user_crc32 +++ b/scripts/xattr_user_crc32 @@ -1,5 +1,5 @@ #!/usr/bin/env python3 -# Copyright 2020 vg +# Copyright 2022 vg # SPDX-License-Identifier: MIT ''' @@ -24,15 +24,15 @@ Options: Null instead of LF as filename separator for in and out ''' -### standard modules +# standard modules import contextlib import functools import itertools -import operator -import os import sys +from os import getxattr, setxattr +from os.path import basename -### external modules +# external modules import docopt @@ -69,16 +69,18 @@ def get_crc32(filename): def main(): - args = docopt.docopt(__doc__.format(progname=os.path.basename(sys.argv[0]))) + args = docopt.docopt(__doc__.format(progname=basename(sys.argv[0]))) separator = '\0' if args['-z'] else '\n' for filename in filenames(args['FILENAME'], separator): tag_crc32 = None with contextlib.suppress(OSError): - tag_crc32 = os.getxattr(filename, 'user.crc32').decode('utf8') + tag_crc32 = getxattr(filename, 'user.crc32').decode('utf8') calculated_crc32 = get_crc32(filename) - os.setxattr(filename, 'user.crc32', calculated_crc32.encode('utf8')) + if tag_crc32 != calculated_crc32: + # write access to filesystem only if needed + setxattr(filename, 'user.crc32', calculated_crc32.encode('utf8')) print('%-8s %-8s %s' - % (tag_crc32, calculated_crc32, filename), end=separator) + % (tag_crc32, calculated_crc32, filename), end=separator) main() |