blob: 94b1c8d8c2341f0f640efe5832246696ffbe5b75 [file] [log] [blame]
#!/usr/bin/env bash
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# For each filespec FS given (one per line) on stdin, rename FS (if it exists) to FS.old, then rename FS.new to
# FS.
if [[ "$*" = "--help" ]] ; then
echo "For each filespec FS read from stdin, rename FS.new to FS. If FS already exists, rename to FS.old" >&2
exit 0
fi
while read F
do
python3 - "$F" << THE_END
import sys
import os
def eprint(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
def rename_file(old_path, new_path):
try:
os.rename(old_path, new_path)
except:
eprint(f"fatal error: failure renaming {old_path} to {new_path}\n")
sys.exit(1)
def rename_to_old(pathspec):
op = pathspec + ".old"
if os.access(op, os.F_OK):
last = 2
while os.access(op + ".{}".format(last), os.F_OK):
last += 1
while last > 2:
rename_file(op + ".{}".format(last - 1), op + ".{}".format(last))
last -= 1
rename_file(op, op + ".2")
rename_file(pathspec, op)
filespec = sys.argv[1]
if os.access(filespec, os.F_OK):
rename_to_old(filespec)
rename_file(filespec + ".new", filespec)
sys.exit(0)
THE_END
done