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#!/bin/sh
usage() {
echo "Usage: $0 [-nv] [[[user@]host:]dir]
$0 removes old backups and keeps:
- backups for the current day
- 1 backup per past day for the current month
- 1 backup per past month for the current year
- 1 backup per past year
Options:
-n dry run
-v verbose
Environment variables:
- BACKUP - backup directory"
}
while getopts :nv opt; do
case $opt in
(n) optn=echo ;;
(v) optv=-t ;;
(*) usage; exit 1 ;;
esac
done
shift $((OPTIND -1))
BACKUP=${1:-$BACKUP}
[ "$BACKUP" ] || { usage; exit 1; }
host=${BACKUP%:*} dir=${BACKUP#*:}
ls='ls -r' rm="xargs -r $optv $optn rm -rf"
[ "$host" = "$dir" ] || ls="ssh $host $ls" rm="ssh $host $rm"
echo "# Cleaning backups on $BACKUP"
$ls "$dir" |
awk -v now=$(date +%Y-%m-%d) -v dir="$dir" '
BEGIN {
yn = substr(now, 1, 4) # Year now
mn = substr(now, 6, 2) # Month now
dn = substr(now, 9, 2) # Day now
}
{
yb = substr($0, 1, 4) # Year backup
mb = substr($0, 6, 2) # Month backup
db = substr($0, 9, 2) # Day backup
$0 = dir "/" $0
dy = yn - yb
dm = dy * 12 + mn - mb
# if (yb != yn) {
if (dm > 12) {
if (yb in yearly) print; else yearly[yb] = 1
next
}
# if (mb != mn) {
dd = dm * 30 + dn - db
if (dd > 30) {
if (mb in monthly) print; else monthly[mb] = 1
next
}
if (db != dn) {
if (db in dayly) print; else dayly[db] = 1
}
}' | $rm
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