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#!/bin/sh -eu
#
# sparsify -- De-allocate blocks with only null bytes in a file
#
# Copyright (c) 2018 Samuel Lidén Borell <samuel@kodafritt.se>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
print_help() {
cat <<EOF
usage: $0 FILENAMES...
De-allocate blocks with only null bytes in a file.
Useful when tools like "fallocate -d" don't work for some reason
(can happen even on ext4)
EOF
}
if [ $# = 0 ] || [ "$1" = --help ]; then
print_help
[ $# = 1 ]
exit
fi
while [ $# -gt 0 ]; do
echo "Processing $1..."
tempname="$1.sparsify.tmp"
cp -n --preserve=all -P --sparse=always "$1" "$tempname"
mv "$tempname" "$1"
shift
done
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