118 lines
3.1 KiB
Bash
Executable File
118 lines
3.1 KiB
Bash
Executable File
#! /bin/sh
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# change this to the name of your ZFS pool.
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zpool="zroot"
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# make a backup collection having 1 full and N-1 incremental backups.
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# set to 1 to avoid incrementals and always take full dumps.
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max_incremental=4
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usage () {
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echo "Usage:"
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echo "zfsbk.sh <bkname> [numincr]"
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echo "Takes & sends backup with given name. If snapshots with"
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echo "this name exist, backup incrementally. Limit incremental"
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echo "backup sequences to 'numincr' steps (default 1 = alw. full)."
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echo
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echo "Optional envvars:"
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echo "UPLOAD_PATH upload generated backup to this path. scp:// or rsync://"
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}
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# first argument: name of backup set
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if [ $# -lt 1 ]
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then
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usage
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exit 1
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fi
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bkname=$1
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if ! echo $bkname | grep -qiE '^[a-z0-9-]+$'
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then
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echo "Given bkname is invalid. Want alphanumeric and hyphens."
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exit 1
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fi
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if echo "$2" | grep -qE '^[1-9][0-9]*$'
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then
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max_incremental=$2
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fi
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export PATH=$PATH:/usr/local/bin
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# list snapshots by decreasing time. Arguments: [name] restrict listing to this tag
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list_named_snaps () {
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local bkname=$1
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snapdir="/.zfs/snapshot"
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for i in $snapdir/zbk-$bkname-*
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do
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test -e "$i" && (echo $i |sed "s@^$snapdir/@@")
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done | sort -r
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}
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# remove all datasets for a given tag. Arguments: $1 -> bkname
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reset_sequence () {
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local bkname=$1
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list_named_snaps $bkname | while read snapname
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do
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zfs destroy -r $zpool@$snapname
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done
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}
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# take snapshot
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#echo ./zfssnap.sh $bkname $max_incremental
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if ! ./zfssnap.sh $bkname $max_incremental
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then
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echo "Error creating snapshot! Code $?"
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exit 1
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fi
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# get label
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num_snaps=`list_named_snaps $bkname | awk 'END {print NR}'`
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label_latest=`list_named_snaps $bkname | awk NR==1`
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# decide what to do based on how many snapshots were found
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if [ $num_snaps -eq 0 ]
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then
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# no snapshots. Something's wrong
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echo "Error, no snapshots found for $bkname!"
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list_named_snaps $bkname
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exit 1
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elif [ $num_snaps -eq 1 ]
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then
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# first snapshot. Send full
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bkfile="/backups/${label_latest}.dump"
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#echo zfs send -R $zpool@$label_latest
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zfs send -R $zpool@$label_latest 2>/dev/null > $bkfile
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else
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# n-th snapshot. Send incrementally
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label_2ndlatest=`list_named_snaps $bkname | awk NR==2`
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bkfile="/backups/${label_latest}--${label_2ndlatest}.dump"
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#echo zfs send -i $label_2ndlatest -R $zpool@$label_latest
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zfs send -i $label_2ndlatest -R $zpool@$label_latest 2>/dev/null > $bkfile
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fi
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if [ $num_snaps -eq $max_incremental ]
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then
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# finished the incremental sequence. Take full backup next time
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echo "Sequence of $max_incremental increm steps complete. Resetting."
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reset_sequence $bkname
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fi
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# upload backup to remote location
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if [ "x$UPLOAD_PATH" != x ]
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then
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#echo "Archiving $bkfile remotely..."
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if echo "$UPLOAD_PATH" | grep -qE '^rsync://'
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then
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rsync -qz $bkfile ${UPLOAD_PATH#rsync://}
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elif echo "$UPLOAD_PATH" | grep -qE '^scp://'
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then
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scp -BCq $bkfile ${UPLOAD_PATH#scp://}
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else
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echo "UPLOAD_PATH not understood! '$UPLOAD_PATH'"
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echo "Expecting rsync://.. or scp://.."
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exit 1
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fi
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fi
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