40 lines
776 B
Bash
Executable file
40 lines
776 B
Bash
Executable file
#!/bin/bash
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if [[ -z "$1" || -z "$2" ]] ; then
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echo "usage: $0 <zfs_object> <density>" >&2
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exit 1
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fi
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timestamp () {
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t="`echo \"$1\" |sed -ne 's/^.*@zb-//p' |tr 'p_' '+ '`"
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[[ -z "$t" ]] && return 1
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date --date="$t" +%s
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return $?
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}
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density="$2"
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timenow=`date +%s`
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lasttime=0
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# list snapshots
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zfs list -t snapshot -r -d 1 -H "$1" |awk '{print $1;}' | while read l ; do
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#link unix timestamps
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unixtime=`timestamp "$l"` || continue
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echo "$unixtime" "$l"
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done |sort -n | while read l ; do
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curtime=${l%% *}
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snapname=${l#* }
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if [ "$curtime" -ge "$timenow" ] ; then
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break
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fi
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#if it's too dense, delete the closer snapshot
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if [ $(( $density*($curtime-$lasttime)/($timenow-$lasttime) )) -lt 1]
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then
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zfs destroy "$snapname"
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else
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lasttime="$curtime"
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fi
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done
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