rearrange zpool args, style
This commit is contained in:
Dave Eddy
parent
547d01009e
commit
f1be6dc83d
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@ -10,61 +10,62 @@ VERSION='v1.4.0'
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usage() {
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local prog=${0##*/}
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cat <<-EOF
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usage: $prog [-hnliqRvV] [-p <prefix>] [-s <suffix>] <time> [[dataset1] ...]
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cat <<EOF
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usage: $prog [-hnliqRvV] [-p <prefix>] [-s <suffix>] <time> [[dataset1] ...]
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remove snapshots from one or more zpools that match given criteria
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remove snapshots from one or more zpools that match given criteria
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examples
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# $prog 1w
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remove snapshots older than a week across all zpools
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examples
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# $prog 1w
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remove snapshots older than a week across all zpools
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# $prog -vn 1w
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same as above, but with increased verbosity and without
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actually deleting any snapshots (dry-run)
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# $prog -vn 1w
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same as above, but with increased verbosity and without
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actually deleting any snapshots (dry-run)
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# $prog 3w tank1 tank2/backup
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remove snapshots older than 3 weeks on tank1 and tank2/backup.
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note that this script will recurse through *all* of tank1 and
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*all* datasets below tank2/backup
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# $prog 3w tank1 tank2/backup
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remove snapshots older than 3 weeks on tank1 and tank2/backup.
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note that this script will recurse through *all* of tank1 and
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*all* datasets below tank2/backup
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# $prog -p 'autosnap_' 1M zones
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remove snapshots older than a month on the zones pool that start
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with the string "autosnap_"
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# $prog -p 'autosnap_' 1M zones
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remove snapshots older than a month on the zones pool that start
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with the string "autosnap_"
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# $prog -s '_frequent' 2M tank
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remove snapshots older than two months on the tank pool that end
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with the string "_frequent"
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# $prog -s '_frequent' 2M tank
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remove snapshots older than two months on the tank pool that end
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with the string "_frequent"
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# $prog -i -p 'autosnap_' 1M zones
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remove snapshots older than a month on the zones pool that do not
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start with the string "autosnap_"
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# $prog -i -p 'autosnap_' 1M zones
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remove snapshots older than a month on the zones pool that do not
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start with the string "autosnap_"
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timespec
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the first argument denotes how old a snapshot must be for it to
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be considered for deletion - possible specifiers are
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timespec
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the first argument denotes how old a snapshot must be for it to
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be considered for deletion - possible specifiers are
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s seconds
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m minutes
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h hours
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d days
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w weeks
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M months
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y years
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s seconds
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m minutes
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h hours
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d days
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w weeks
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M months
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y years
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options
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-h print this message and exit
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-n dry-run, don't actually delete snapshots
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-l list only mode, just list matching snapshots names
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without deleting (like dry-run mode with machine-parseable output)
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-p <prefix> snapshot prefix string to match
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-s <suffix> snapshot suffix string to match
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-i invert matching of prefix and suffix
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-q quiet, do not printout removed snapshots
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-R recursively delete, pass '-R' directly to 'zfs destroy'
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-v increase verbosity
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-V print the version number and exit
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EOF
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options
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-h print this message and exit
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-n dry-run, don't actually delete snapshots
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-l list only mode, just list matching snapshots names
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without deleting (like dry-run mode with machine-parseable
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output)
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-p <prefix> snapshot prefix string to match
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-s <suffix> snapshot suffix string to match
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-i invert matching of prefix and suffix
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-q quiet, do not printout removed snapshots
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-R recursively delete, pass '-R' directly to 'zfs destroy'
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-v increase verbosity
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-V print the version number and exit
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EOF
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}
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debug() {
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@ -144,6 +145,7 @@ human-time() {
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echo '0 seconds'
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}
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# convert bytes to a human-readable string
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human-size() {
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local bytes=$1
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@ -225,6 +227,7 @@ code=0
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totalused=0
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numsnapshots=0
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humanpools=${pools[*]}
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humanpools=${humanpools:-<all>}
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if $recursive; then
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destroyargs+=('-R')
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@ -243,40 +246,50 @@ fi
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# first pass of the pools (to calculate totals and filter unwanted datasets
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lines=()
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while read -r line; do
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read -r creation snapshot used _ <<< "$line"
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read -r creation used snapshot _ <<< "$line"
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# ensure optional prefix matches
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snapname=${snapshot#*@}
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if $invert; then
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if [[ -n $prefix && $prefix == "${snapname:0:${#prefix}}" ]]; then
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debug "skipping $snapshot: does match prefix $prefix"
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if [[ -n $prefix ]]; then
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match=false
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if [[ $prefix == "${snapname:0:${#prefix}}" ]]; then
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match=true
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fi
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if $invert && $match; then
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debug "skipping $snapshot: does match prefix '$prefix'"
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continue
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fi
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else
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if [[ -n $prefix && $prefix != "${snapname:0:${#prefix}}" ]]; then
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debug "skipping $snapshot: doesn't match prefix $prefix"
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if ! $invert && ! $match; then
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debug "skipping $snapshot: doesn't match prefix '$prefix'"
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continue
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fi
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fi
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# ensure optional suffix matches
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if $invert; then
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if [[ -n $suffix && $suffix == "${snapname: -${#suffix}}" ]]; then
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debug "skipping $snapshot: does match suffix $suffix"
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if [[ -n $suffix ]]; then
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match=false
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if [[ $suffix == "${snapname: -${#suffix}}" ]]; then
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match=true
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fi
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if $invert && $match; then
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debug "skipping $snapshot: does match suffix '$suffix'"
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continue
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fi
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else
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if [[ -n $suffix && $suffix != "${snapname: -${#suffix}}" ]]; then
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debug "skipping $snapshot: doesn't match suffix $suffix"
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if ! $invert && ! $match; then
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debug "skipping $snapshot: doesn't match suffix '$suffix'"
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continue
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fi
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fi
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# ensure snapshot is older than the cutoff time
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delta=$((now - creation))
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humantime=$(human-time "$delta")
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ht=$(human-time "$delta")
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if ((delta <= seconds)); then
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debug "skipping $snapshot: $humantime old"
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debug "skipping $snapshot: $ht old"
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continue
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fi
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@ -289,7 +302,7 @@ while read -r line; do
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((totalused += used))
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((numsnapshots++))
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lines+=("$line")
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done < <(zfs list -Hpo creation,name,used -t snapshot -r "${pools[@]}")
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done < <(zfs list -Hpo creation,used,name -t snapshot -r "${pools[@]}")
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# finish if running with `-l`
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if $listonly; then
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@ -299,24 +312,24 @@ fi
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humantotal=$(human-size "$totalused")
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echo "found $numsnapshots snapshots ($humantotal) on pools: ${humanpools:-<all>}"
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echo "found $numsnapshots snapshots ($humantotal) on pools: $humanpools"
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# process snapshots found
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i=0
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for line in "${lines[@]}"; do
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read -r creation snapshot used _ <<< "$line"
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read -r creation used snapshot _ <<< "$line"
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((i++))
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delta=$((now - creation))
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humantime=$(human-time "$delta")
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humanused=$(human-size "$used")
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ht=$(human-time "$delta")
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hu=$(human-size "$used")
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if $dryrun; then
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echo -n '[dry-run] '
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fi
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echo "[$i/$numsnapshots] removing $snapshot: $humantime old ($humanused)"
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echo "[$i/$numsnapshots] removing $snapshot: $ht old ($hu)"
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if ! $dryrun; then
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zfs destroy "${destroyargs[@]}" "$snapshot" || code=1
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