105 lines
2.2 KiB
Bash
Executable File
105 lines
2.2 KiB
Bash
Executable File
#!/bin/bash
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# ZSC - zfs snapshot cron
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CONFIG_FILE="$HOME/.zsc"
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FORMAT='+%Y-%m-%d'
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DATE=$(date $FORMAT)
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### LOCK ###
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echo "Locking ZSC"
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if ! lockfile-create -p -r 2 "zsc"; then
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echo "Another backup is running, aborting"
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exit 49
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fi
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split_date() {
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echo "$1" | sed -E 's/([0-9]{4})-([0-9]{2})-([0-9]{2})/\1\n\2\n\3/'
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}
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handle_dataset() {
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DATASET=$1
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D=$2
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W=$3
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M=$4
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Y=$5
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PREFIX=$6
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if test -z "$PREFIX"; then
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PREFIX="zsc-"
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fi
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if test "!no_prefix!" = "$PREFIX"; then
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PREFIX=""
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fi
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echo "--- $DATASET --- $D $W $M $Y $PREFIX"
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SNAPSHOTS=($(zfs list -t snapshot -o name | grep "$DATASET@$PREFIX" | sort -r))
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echo "Snapshots: ${#SNAPSHOTS[@]}"
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EXISTS=0
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for s in "${SNAPSHOTS[@]}"; do
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sdate=$(echo "$s" | awk 'match($0, /.+@'"$PREFIX"'(.+)/, a) {print a[1]}')
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if [ "$sdate" = $DATE ]; then
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EXISTS=1
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fi
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scomp=($(split_date "$sdate") $(date -d "$stripped_date" "+%u %W"))
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echo -n "${scomp[3]} ${scomp[4]} | "
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echo -n "${sdate}: "
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if [ $D -gt 0 ]; then
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D=$(( D-1 ))
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echo "KEEP; D: $D"
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elif [ $W -gt 0 ] && [ ${scomp[3]#0} -eq 1 ]; then
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W=$(( W-1 ))
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echo "KEEP; W: $W"
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elif [ $M -gt 0 ] && [ ${scomp[3]#0} -eq 1 ] && [ $(( ${scomp[4]#0} % 4 )) -eq 0 ]; then
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M=$(( M-1 ))
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echo "KEEP; M: $M"
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elif [ $Y -gt 0 ] && [ ${scomp[3]#0} -eq 1 ] && [ ${scomp[4]#0} -eq 4 ]; then
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Y=$(( Y-1 ))
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echo "KEEP; Y: $Y"
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else
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zfs destroy "$s"
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echo "DISCARD"
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fi
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done
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if [ $EXISTS -eq 0 ]; then
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echo -e "Creating snapshot $DATASET@$PREFIX$DATE"
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zfs snapshot $DATASET@$PREFIX$DATE
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fi
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}
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cat "$CONFIG_FILE" | while IFS=: read dataset recursive d w m y prefix; do
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echo "| ##### Dataset: $dataset Recursive: $recursive Prefix: $prefix d: $d w: $w m: $m y: $y #####"
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if [ $recursive = "true" ]; then
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SUBDATASETS=($(zfs list -o name | grep "$dataset/"))
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echo -e "| Subdatasets: ${SUBDATASETS[@]}"
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echo -e '|'
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for p in "${SUBDATASETS[@]}"; do
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handle_dataset $p $d $w $m $y $prefix | awk '{print "| " $0}'
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echo -e '|'
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done
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fi
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handle_dataset $dataset $d $w $m $y $prefix | awk '{print "| " $0}'
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echo -e "----------------------------------------------------------------------"
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done
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### UNLOCK ###
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echo "Unlocking ZSC"
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lockfile-remove "zsc"
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