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#! /bin/sh
# This file is part of BEAM
# Copyright (C) 2012-2014 Sergey Poznyakoff
#
# BEAM is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# BEAM is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with BEAM. If not, see <http://www.gnu.org/licenses/>.
libdir=@LIBDIR@/beam
set -e
. $libdir/common.sh
set +e
dir=
suffix=
retainweeks=3
dry_run=
verbose=:
help() {
cat <<EOF
usage: $0 [OPTIONS] DIR
cleans up old backup files in DIR
OPTIONS are:
-s, --suffix SUF consider only file names ending in SUF
-r, --retain N retain N last weeks of backups (default $retainweeks)
-v, --verbose verbosely list what is being done
-n, --dry-run do nothing, print what would have been done
-h, --help print this help list
EOF
exit 0
}
while [ $# -ne 0 ]
do
case $1 in
-s|--suffix) shift; suffix=$1;;
-r|--retain) shift; retainweeks=$1;;
-v|--verbose) verbose=echo;;
-n|--dry-run) dry_run=echo; verbose=echo;;
-h|--help) help;;
--wtf) wtf $(basename $0) clean up old files; exit 0;;
--) shift; break;;
-*) echo >&2 "$0: unrecognized option $1"
exit 1;;
*) break
esac
shift
done
case $# in
0) echo >&2 "$0: not enough arguments"
exit 1;;
1) dir=$1;;
*) echo >&2 "$0: too many arguments"
exit 1;;
esac
thisweek=$(date +%U)
# Warning: do not use shell arithmetic expansions on week numbers,
# because weeks prior to 10 begin with 0 and therefore are processed
# as octal numbers. This causes grief for weeks 08 and 09.
if [ $thisweek -gt $retainweeks ]; then
lastweek=$(expr $thisweek - $retainweeks)
else
lastweek=$(expr $thisweek + 54 - $retainweeks)
fi
$verbose \# removing from $dir files ending in $suffix and older than week $lastweek
if [ -z "$suffix" ]; then
find $dir -maxdepth 1 -type f -printf '%f\n'
else
find $dir -maxdepth 1 -type f -name "*$suffix" -printf '%f\n'
fi |
while read name
do
$verbose \# considering $name
week=$(expr "$name" : '[^-][^-]*-\([0-9][0-9]*\)-.*')
if [ $thisweek -ge $week ]; then
if [ $(expr $thisweek - $week) -gt $retainweeks ]; then
$verbose \# removing $name
$dry_run rm $dir/$name
fi
else
if [ $(expr $thisweek + 54 - $week) -gt $retainweeks ]; then
$verbose \# removing $name
$dry_run rm $dir/$name
fi
fi
done
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