私はテストケースを研究していますが、各テストケースは~/test
。ls -rtl
ディレクトリの変更タイムスタンプを変更せずにディレクトリからファイルを削除できますか?
答え1
ファイルを削除したら、ディレクトリのタイムスタンプをリセットする必要があります。 GNUツールを使用すると仮定すると、次のように動作します。
mtime=$(stat -c %y dir) # get the timestamp, store in $mtime
rm dir/somefile dir/someotherfile # do whatever you need
touch -d "$mtime" dir # set the timestamp back
これにより、ディレクトリの変更()およびアクセス()タイムスタンプが元の修正タイムスタンプにmtime
リセットされ、変更タイムスタンプ()も現在の時刻に設定されます。変化は避けられませんが、気にしないかもしれません。atime
ctime
ctime
atime
答え2
このtouch
コマンドは、-r
参照ファイルと同じタイムスタンプを持つファイルをタッチするオプションを提供します。だからあなたはこれを行うことができます:
touch -r /dir/somefile /tmp/_thetimestamps # save the timestamps in /tmp/_thetimestamps
rm /dir/somefile # do whatever you need
touch -r /tmp/_thetimestamps /dir # set the timestamps back
-r, --reference=FILE
use this file's times instead of current time
-r Use the access and modifications times from the specified file
instead of the current time of day.
答え3
Pythonのバージョンですikkachuの素晴らしい答え:
https://gist.github.com/jaytaylor/ea1b6082ea5bcea7a6b65518d91238f5
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Removes a file or directory while preserving the modification time (mtime) of
the parent directory.
Pure-python implementation.
See also:
https://unix.stackexchange.com/a/565595/22709
"""
import argparse
import logging
import os
import platform
import re
import shutil
import stat
import sys
log_formatter = logging.Formatter('%(asctime)s, %(levelname)s %(message)s')
logging.basicConfig(level=logging.INFO, formatter=log_formatter)
logger = logging.getLogger(__name__)
def parse_opts(args):
parser = argparse.ArgumentParser(
description='Removes a file or directory while preserving the modification time (mtime) of the parent directory.',
argument_default=False,
)
parser.add_argument('-f', '--force', default=False, action='store_true', help='Ignore nonexistent files and arguments')
parser.add_argument('-i', '--interactive', default=False, action='store_true', help='Prompt for confirmation before taking action on a target')
parser.add_argument('--no-preserve-root', default=False, action='store_true', help="Do not treat '/' specially")
parser.add_argument('-r', '--recursive', default=False, action='store_true', help='Remove directories and their contents recursively')
parser.add_argument('-v', '--verbose', default=False, action='store_true', help='Display verbose log output')
parser.add_argument('paths', type=str, nargs='+', help='Filesystem path(s) to remove')
opts = parser.parse_args(args)
if opts.verbose:
logger.setLevel(logging.DEBUG)
return opts
# n.b. Use the appropriate input function depending on whether the runtime
# environment is Python version 2 or 3.
_input_fn = input if sys.version_info > (3, 0) else raw_input
def _prompt_for_confirmation(path, opts):
if not opts.interactive:
return True
response = _input_fn('Permanently remove "%s"? (Y/n)' % (path,))
return response in ('Y', 'y')
def require_write_permissions(path):
parent = os.path.dirname(path)
if not os.access(parent, os.W_OK):
raise Exception('Missing necessary write permission for parent directory "%s"; operation aborted' % (parent,))
def rm_preserving_parent_mtime(path, opts):
"""
Deletes the specified path, and restores the filesystem access and modified
timestamp values afterward removing path.
IMPORTANT
---------
Take note of the permission test before removing the target. These checks
verify write access to parent's parent.
Without the check, there is a risk that the file will be removed and then
setting mtime fails. When this happens, the entire purpose of this program is defeated.
"""
if not opts.no_preserve_root and (path == os.sep or (platform.system() == 'Windows' and re.match(r'^[A-Z]:%s?' % (os.sep,), path))):
raise Exception('Cowardly refusing to operate on root path')
if path in ('', '.', '..'):
raise Exception('Invalid path "%s", must have a parent directory' % (path,))
parent = os.path.dirname(path)
if path == parent:
raise Exception('Invalid path, parent directory="%s" should not equal path="%s"' % (parent, path))
st = os.stat(parent)
atime = st[stat.ST_ATIME]
mtime = st[stat.ST_MTIME]
modified = False
try:
if os.path.isfile(path):
require_write_permissions(parent)
if _prompt_for_confirmation(path, opts):
logger.debug('Removing file "%s"' % (path,))
modified = True
os.remove(path)
elif os.path.isdir(path):
if not opts.recursive:
raise Exception('Cannot remove "%s": Is a directory' % (path,))
require_write_permissions(parent)
if _prompt_for_confirmation(path, opts):
logger.debug('Removing directory "%s"' % (path,))
modified = True
shutil.rmtree(path)
else:
raise Exception('Path "%s" is not a file or directory' % (path,))
finally:
if modified:
logger.debug('Restoring access and modification timestamps for parent="%s"' % (parent,))
os.utime(parent, (atime, mtime))
def main(paths, opts):
try:
for path in paths:
rm_preserving_parent_mtime(path, opts)
return 0
except BaseException:
logger.exception('Caught exception in main')
if opts.force:
return 0
return 1
if __name__ == '__main__':
opts = parse_opts(sys.argv[1:])
sys.exit(main(opts.paths, opts))
親ディレクトリmtimeを維持しながらファイルを移動または削除するための完全なソリューションについては、次のPythonスクリプトを参照してください。https://gist.github.com/jaytaylor/e2e0b53baf224f4e973b252370499de7