server-scripts/zfs_snapshot_cron.sh

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#!/bin/bash
PREFIX="zsc-"
CONFIG_FILE="$HOME/.zfs_snapshot_cron"
FORMAT='+%Y-%m-%d'
DATE=$(date $FORMAT)
split_date() {
echo "$1" | sed -E 's/([0-9]{4})-([0-9]{2})-([0-9]{2})/\1\n\2\n\3/'
}
handle_pool() {
POOL=$1
D=$2
W=$3
M=$4
Y=$5
echo "--- $POOL --- $D $W $M $Y"
SNAPSHOTS=($(zfs list -t snapshot -o name | grep "$POOL@$PREFIX" | sort -r))
echo "Snapshots: ${#SNAPSHOTS[@]}"
EXISTS=0
for s in "${SNAPSHOTS[@]}"; do
sdate=$(echo "$s" | awk 'match($0, /.+@'"$PREFIX"'(.+)/, a) {print a[1]}')
if [ "$sdate" = $DATE ]; then
EXISTS=1
fi
scomp=($(split_date "$sdate") $(date -d "$sdate" "+%u %W"))
echo -n "${scomp[3]} ${scomp[4]} | "
echo -n "${sdate}: "
if [ $D -gt 0 ]; then
D=$(( D-1 ))
echo "KEEP; D: $D"
elif [ $W -gt 0 ] && [ ${scomp[3]} -eq 1 ]; then
W=$(( W-1 ))
echo "KEEP; W: $W"
elif [ $M -gt 0 ] && [ ${scomp[3]} -eq 1 ] && [ $(( scomp[4] % 4 )) -eq 0 ]; then
M=$(( M-1 ))
echo "KEEP; M: $M"
elif [ $Y -gt 0 ] && [ ${scomp[3]} -eq 1 ] && [ ${scomp[4]} -eq 4 ]; then
Y=$(( Y-1 ))
echo "KEEP; Y: $Y"
else
zfs destroy "$s"
echo "DISCARD"
fi
done
if [ $EXISTS -eq 0 ]; then
echo -e "Creating snapshot $POOL@$PREFIX$DATE"
zfs snapshot $POOL@$PREFIX$DATE
fi
}
cat "$CONFIG_FILE" | while IFS=: read pool recursive d w m y; do
echo "| ##### Pool: $pool Recursive: $recursive d: $d w: $w m: $m y: $y #####"
if [ $recursive = "true" ]; then
SUBPOOLS=($(zfs list -o name | grep "$pool/"))
echo -e "Subpools: ${SUBPOOLS[@]}"
echo -e '|'
for p in "${SUBPOOLS[@]}"; do
handle_pool $p $d $w $m $y | awk '{print "| " $0}'
echo -e '|'
done
fi
handle_pool $pool $d $w $m $y | awk '{print "| " $0}'
echo -e "----------------------------------------------------------------------"
done