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@ -1,4 +1,4 @@
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#!/bin/sh
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#!/bin/bash
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# zfs-auto-snapshot for Linux
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# Automatically create, rotate, and destroy periodic ZFS snapshots.
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@ -29,6 +29,7 @@ opt_backup_incremental=''
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opt_default_exclude=''
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opt_dry_run=''
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opt_event='-'
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opt_fast_zfs_list=''
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opt_keep=''
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opt_label=''
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opt_prefix='zfs-auto-snap'
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@ -38,6 +39,9 @@ opt_setauto=''
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opt_syslog=''
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opt_skip_scrub=''
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opt_verbose=''
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opt_pre_snapshot=''
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opt_post_snapshot=''
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opt_do_snapshots=1
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# Global summary statistics.
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DESTRUCTION_COUNT='0'
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@ -51,9 +55,10 @@ SNAPSHOTS_OLD=''
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print_usage ()
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{
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echo "Usage: $0 [options] [-l label] <'//' | name [name...]>
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--default-exclude Exclude objects if com.sun:auto-snapshot is unset.
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--default-exclude Exclude datasets if com.sun:auto-snapshot is unset.
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-d, --debug Print debugging messages.
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-e, --event=EVENT Set the com.sun:auto-snapshot-desc property to EVENT.
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--fast Use a faster zfs list invocation.
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-n, --dry-run Print actions without actually doing anything.
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-s, --skip-scrub Do not snapshot filesystems in scrubbing pools.
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-h, --help Print this usage message.
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@ -67,7 +72,8 @@ print_usage ()
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-g, --syslog Write messages into the system log.
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-r, --recursive Snapshot named filesystem and all descendants.
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-v, --verbose Print info messages.
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name Filesystem and volume names, or '//' for all ZFS objects.
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--destroy-only Only destroy older snapshots, do not create new ones.
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name Filesystem and volume names, or '//' for all ZFS datasets.
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"
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}
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@ -104,7 +110,7 @@ print_log () # level, message, ...
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;;
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(inf*)
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# test -n "$opt_syslog" && logger -t "$opt_prefix" -p daemon.info $*
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test -n "$opt_verbose" && echo $*
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test -z ${opt_quiet+x} && test -n "$opt_verbose" && echo $*
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;;
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(deb*)
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# test -n "$opt_syslog" && logger -t "$opt_prefix" -p daemon.debug $*
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@ -146,6 +152,8 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
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local GLOB="$4"
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local TARGETS="$5"
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local KEEP=''
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local LABEL="$6"
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local RUNSNAP=1
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# global DESTRUCTION_COUNT
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# global SNAPSHOT_COUNT
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@ -154,29 +162,41 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
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for ii in $TARGETS
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do
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if do_run "zfs snapshot $PROPS $FLAGS '$ii@$NAME'"
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if [ -n "$opt_do_snapshots" ]
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then
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SNAPSHOT_COUNT=$(( $SNAPSHOT_COUNT + 1 ))
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else
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WARNING_COUNT=$(( $WARNING_COUNT + 1 ))
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continue
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fi
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if [ "$opt_pre_snapshot" != "" ]
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then
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do_run "$opt_pre_snapshot $ii $NAME" || RUNSNAP=0
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fi
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if [ $RUNSNAP -eq 1 ] && do_run "zfs snapshot $PROPS $FLAGS '$ii@$NAME'"
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then
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[ "$opt_post_snapshot" != "" ] && do_run "$opt_post_snapshot $ii $NAME"
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SNAPSHOT_COUNT=$(( $SNAPSHOT_COUNT + 1 ))
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else
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WARNING_COUNT=$(( $WARNING_COUNT + 1 ))
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continue
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fi
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fi
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# Retain at most $opt_keep number of old snapshots of this filesystem,
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# including the one that was just recently created.
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test -z "$opt_keep" && continue
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KEEP="$opt_keep"
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# ASSERT: The old snapshot list is sorted by increasing age.
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for jj in $SNAPSHOTS_OLD
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# Match on both $GLOB *and* label.
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while IFS=' ' read -ra arrjj
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do
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# Check whether this is an old snapshot of the filesystem.
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if [ -z "${jj#$ii@$GLOB}" ]
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if [ -z "${arrjj[1]#$ii@$GLOB}" ]
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then
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# Check whether the snapshot has the same label property
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test "${arrjj[0]}" = "$LABEL" || continue
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KEEP=$(( $KEEP - 1 ))
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if [ "$KEEP" -le '0' ]
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then
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if do_run "zfs destroy $FLAGS '$jj'"
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if do_run "zfs destroy -d $FLAGS '${arrjj[1]}'"
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then
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DESTRUCTION_COUNT=$(( $DESTRUCTION_COUNT + 1 ))
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else
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@ -184,7 +204,7 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
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fi
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fi
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fi
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done
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done <<< "$SNAPSHOTS_OLD"
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done
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}
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@ -193,9 +213,10 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
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# {
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GETOPT=$(getopt \
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--longoptions=default-exclude,dry-run,skip-scrub,recursive \
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--longoptions=default-exclude,dry-run,fast,skip-scrub,recursive \
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--longoptions=event:,keep:,label:,prefix:,sep: \
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--longoptions=debug,help,quiet,syslog,verbose \
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--longoptions=pre-snapshot:,post-snapshot:,destroy-only \
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--options=dnshe:l:k:p:rs:qgv \
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-- "$@" ) \
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|| exit 128
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@ -226,6 +247,10 @@ do
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fi
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shift 2
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;;
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(--fast)
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opt_fast_zfs_list='1'
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shift 1
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;;
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(-n|--dry-run)
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opt_dry_run='1'
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shift 1
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@ -256,7 +281,7 @@ do
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while test "${#opt_prefix}" -gt '0'
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do
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case $opt_prefix in
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([![:alnum:]_-.:\ ]*)
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([![:alnum:]_.:\ -]*)
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print_log error "The $1 parameter must be alphanumeric."
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exit 130
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;;
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@ -278,7 +303,7 @@ do
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;;
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(--sep)
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case "$2" in
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([[:alnum:]_-.:\ ])
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([[:alnum:]_.:\ -])
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:
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;;
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('')
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@ -302,6 +327,18 @@ do
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opt_verbose='1'
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shift 1
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;;
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(--pre-snapshot)
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opt_pre_snapshot="$2"
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shift 2
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;;
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(--post-snapshot)
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opt_post_snapshot="$2"
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shift 2
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;;
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(--destroy-only)
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opt_do_snapshots=''
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shift 1
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;;
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(--)
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shift 1
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break
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@ -335,13 +372,23 @@ fi
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ZPOOL_STATUS=$(env LC_ALL=C zpool status 2>&1 ) \
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|| { print_log error "zpool status $?: $ZPOOL_STATUS"; exit 135; }
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ZFS_LIST=$(env LC_ALL=C zfs list -H -t filesystem,volume -s name \
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-o name,com.sun:auto-snapshot,com.sun:auto-snapshot:"$opt_label") \
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|| { print_log error "zfs list $?: $ZFS_LIST"; exit 136; }
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SNAPSHOTS_OLD=$(env LC_ALL=C zfs list -H -t snapshot -S creation -o name) \
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|| { print_log error "zfs list $?: $SNAPSHOTS_OLD"; exit 137; }
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if [ -n "$opt_fast_zfs_list" ]
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then
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SNAPSHOTS_OLD=$(env LC_ALL=C zfs list -H -t snapshot -o com.sun:auto-snapshot-label,name -s name | \
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grep $opt_prefix | \
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awk '{ print substr( $0, length($0) - 14, length($0) ) " " $0}' | \
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sort -r -k1,1 -k3,2 | \
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awk '{ print substr( $0, 17, length($0) )}') \
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|| { print_log error "zfs list $?: $SNAPSHOTS_OLD"; exit 137; }
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else
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SNAPSHOTS_OLD=$(env LC_ALL=C zfs list -H -t snapshot -S creation -o com.sun:auto-snapshot-label,name) \
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|| { print_log error "zfs list $?: $SNAPSHOTS_OLD"; exit 137; }
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fi
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# Verify that each argument is a filesystem or volume.
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for ii in "$@"
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@ -358,26 +405,26 @@ do
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done
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# Get a list of pools that are being scrubbed.
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ZPOOLS_SCRUBBING=$(echo "$ZFS_STATUS" | awk -F ': ' \
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ZPOOLS_SCRUBBING=$(echo "$ZPOOL_STATUS" | awk -F ': ' \
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'$1 ~ /^ *pool$/ { pool = $2 } ; \
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$1 ~ /^ *scan$/ && $2 ~ /scrub in progress/ { print pool }' \
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| sort )
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# Get a list of pools that cannot do a snapshot.
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ZPOOLS_NOTREADY=$(echo "$ZFS_STATUS" | awk -F ': ' \
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ZPOOLS_NOTREADY=$(echo "$ZPOOL_STATUS" | awk -F ': ' \
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'$1 ~ /^ *pool$/ { pool = $2 } ; \
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$1 ~ /^ *state$/ && $2 !~ /ONLINE|DEGRADED/ { print pool } ' \
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| sort)
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# Get a list of objects for which snapshots are explicitly disabled.
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# Get a list of datasets for which snapshots are explicitly disabled.
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NOAUTO=$(echo "$ZFS_LIST" | awk -F '\t' \
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'tolower($2) ~ /false/ || tolower($3) ~ /false/ {print $1}')
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# If the --default-exclude flag is set, then exclude all objects that lack
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# If the --default-exclude flag is set, then exclude all datasets that lack
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# an explicit com.sun:auto-snapshot* property. Otherwise, include them.
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if [ -n "$opt_default_exclude" ]
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then
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# Get a list of objects for which snapshots are explicitly enabled.
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# Get a list of datasets for which snapshots are explicitly enabled.
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CANDIDATES=$(echo "$ZFS_LIST" | awk -F '\t' \
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'tolower($2) ~ /true/ || tolower($3) ~ /true/ {print $1}')
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else
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@ -386,20 +433,21 @@ else
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'tolower($2) !~ /false/ && tolower($3) !~ /false/ {print $1}')
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fi
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# Initialize the list of objects that will get a recursive snapshot.
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# Initialize the list of datasets that will get a recursive snapshot.
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TARGETS_RECURSIVE=''
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# Initialize the list of objects that will get a non-recursive snapshot.
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# Initialize the list of datasets that will get a non-recursive snapshot.
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TARGETS_REGULAR=''
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for ii in $CANDIDATES
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do
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# Qualify object names so variable globbing works properly.
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# Qualify dataset names so variable globbing works properly.
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# Suppose ii=tanker/foo and jj=tank sometime during the loop.
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# Just testing "$ii" != ${ii#$jj} would incorrectly match.
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iii="$ii/"
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# Exclude objects that are not named on the command line.
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# Exclude datasets that are not named on the command line.
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IN_ARGS='0'
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for jj in "$@"
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do
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@ -413,13 +461,13 @@ do
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continue
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fi
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# Exclude objects in pools that cannot do a snapshot.
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# Exclude datasets in pools that cannot do a snapshot.
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for jj in $ZPOOLS_NOTREADY
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do
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|
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# Ibid regarding iii.
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jjj="$jj/"
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# Check whether the pool name is a prefix of the object name.
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# Check whether the pool name is a prefix of the dataset name.
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if [ "$iii" != "${iii#$jjj}" ]
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then
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print_log info "Excluding $ii because pool $jj is not ready."
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@ -427,13 +475,13 @@ do
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fi
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done
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|
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# Exclude objects in scrubbing pools if the --skip-scrub flag is set.
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|
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# Exclude datasets in scrubbing pools if the --skip-scrub flag is set.
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|
|
test -n "$opt_skip_scrub" && for jj in $ZPOOLS_SCRUBBING
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do
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|
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# Ibid regarding iii.
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jjj="$jj/"
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|
|
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# Check whether the pool name is a prefix of the object name.
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# Check whether the pool name is a prefix of the dataset name.
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|
|
if [ "$iii" != "${iii#$jjj}" ]
|
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|
then
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|
|
print_log info "Excluding $ii because pool $jj is scrubbing."
|
|
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|
|
@ -446,17 +494,17 @@ do
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|
# Ibid regarding iii.
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|
|
jjj="$jj/"
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|
|
# The --recusive switch only matters for non-wild arguments.
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|
|
# The --recursive switch only matters for non-wild arguments.
|
|
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|
|
if [ -z "$opt_recursive" -a "$1" != '//' ]
|
|
|
|
|
then
|
|
|
|
|
# Snapshot this object non-recursively.
|
|
|
|
|
# Snapshot this dataset non-recursively.
|
|
|
|
|
print_log debug "Including $ii for regular snapshot."
|
|
|
|
|
TARGETS_REGULAR="${TARGETS_REGULAR:+$TARGETS_REGULAR }$ii" # nb: \t
|
|
|
|
|
continue 2
|
|
|
|
|
# Check whether the candidate name is a prefix of any excluded object name.
|
|
|
|
|
# Check whether the candidate name is a prefix of any excluded dataset name.
|
|
|
|
|
elif [ "$jjj" != "${jjj#$iii}" ]
|
|
|
|
|
then
|
|
|
|
|
# Snapshot this object non-recursively.
|
|
|
|
|
# Snapshot this dataset non-recursively.
|
|
|
|
|
print_log debug "Including $ii for regular snapshot."
|
|
|
|
|
TARGETS_REGULAR="${TARGETS_REGULAR:+$TARGETS_REGULAR }$ii" # nb: \t
|
|
|
|
|
continue 2
|
|
|
|
|
@ -468,7 +516,7 @@ do
|
|
|
|
|
# Ibid regarding iii.
|
|
|
|
|
jjj="$jj/"
|
|
|
|
|
|
|
|
|
|
# Check whether any included object is a prefix of the candidate name.
|
|
|
|
|
# Check whether any included dataset is a prefix of the candidate name.
|
|
|
|
|
if [ "$iii" != "${iii#$jjj}" ]
|
|
|
|
|
then
|
|
|
|
|
print_log debug "Excluding $ii because $jj includes it recursively."
|
|
|
|
|
@ -489,29 +537,46 @@ done
|
|
|
|
|
|
|
|
|
|
# Linux lacks SMF and the notion of an FMRI event, but always set this property
|
|
|
|
|
# because the SUNW program does. The dash character is the default.
|
|
|
|
|
SNAPPROP="-o com.sun:auto-snapshot-desc='$opt_event'"
|
|
|
|
|
SNAPPROP="-o com.sun:auto-snapshot-desc='$opt_event' -o com.sun:auto-snapshot-label=$opt_label"
|
|
|
|
|
|
|
|
|
|
# ISO style date; fifteen characters: YYYY-MM-DD-HHMM
|
|
|
|
|
# On Solaris %H%M expands to 12h34.
|
|
|
|
|
DATE=$(date +%F-%H%M)
|
|
|
|
|
DATE=$(date --utc +%F-%H%M)
|
|
|
|
|
|
|
|
|
|
# The snapshot name after the @ symbol.
|
|
|
|
|
SNAPNAME="$opt_prefix${opt_label:+$opt_sep$opt_label-$DATE}"
|
|
|
|
|
SNAPNAME="$opt_prefix$opt_sep$DATE"
|
|
|
|
|
|
|
|
|
|
# The expression for matching old snapshots. -YYYY-MM-DD-HHMM
|
|
|
|
|
SNAPGLOB="$opt_prefix${opt_label:+?$opt_label}????????????????"
|
|
|
|
|
SNAPGLOB="${opt_prefix}????????????????"
|
|
|
|
|
|
|
|
|
|
test -n "$TARGETS_REGULAR" \
|
|
|
|
|
&& print_log info "Doing regular snapshots of $TARGETS_REGULAR"
|
|
|
|
|
if [ -n "$opt_do_snapshots" ]
|
|
|
|
|
then
|
|
|
|
|
test -n "$TARGETS_REGULAR" \
|
|
|
|
|
&& print_log info "Doing regular snapshots of $TARGETS_REGULAR"
|
|
|
|
|
|
|
|
|
|
test -n "$TARGETS_RECURSIVE" \
|
|
|
|
|
&& print_log info "Doing recursive snapshots of $TARGETS_RECURSIVE"
|
|
|
|
|
test -n "$TARGETS_RECURSIVE" \
|
|
|
|
|
&& print_log info "Doing recursive snapshots of $TARGETS_RECURSIVE"
|
|
|
|
|
|
|
|
|
|
if test -n "$opt_keep" && [ "$opt_keep" -ge "1" ]
|
|
|
|
|
then
|
|
|
|
|
print_log info "Destroying all but the newest $opt_keep snapshots of each dataset."
|
|
|
|
|
fi
|
|
|
|
|
elif test -n "$opt_keep" && [ "$opt_keep" -ge "1" ]
|
|
|
|
|
then
|
|
|
|
|
test -n "$TARGETS_REGULAR" \
|
|
|
|
|
&& print_log info "Destroying all but the newest $opt_keep snapshots of $TARGETS_REGULAR"
|
|
|
|
|
|
|
|
|
|
test -n "$TARGETS_RECURSIVE" \
|
|
|
|
|
&& print_log info "Recursively destroying all but the newest $opt_keep snapshots of $TARGETS_RECURSIVE"
|
|
|
|
|
else
|
|
|
|
|
print_log notice "Only destroying snapshots, but count of snapshots to preserve not given. Nothing to do."
|
|
|
|
|
fi
|
|
|
|
|
|
|
|
|
|
test -n "$opt_dry_run" \
|
|
|
|
|
&& print_log info "Doing a dry run. Not running these commands..."
|
|
|
|
|
|
|
|
|
|
do_snapshots "$SNAPPROP" "" "$SNAPNAME" "$SNAPGLOB" "$TARGETS_REGULAR"
|
|
|
|
|
do_snapshots "$SNAPPROP" "-r" "$SNAPNAME" "$SNAPGLOB" "$TARGETS_RECURSIVE"
|
|
|
|
|
do_snapshots "$SNAPPROP" "" "$SNAPNAME" "$SNAPGLOB" "$TARGETS_REGULAR" "$opt_label"
|
|
|
|
|
do_snapshots "$SNAPPROP" "-r" "$SNAPNAME" "$SNAPGLOB" "$TARGETS_RECURSIVE" "$opt_label"
|
|
|
|
|
|
|
|
|
|
print_log notice "@$SNAPNAME," \
|
|
|
|
|
"$SNAPSHOT_COUNT created," \
|
|
|
|
|
|
