Make zfs backups resumable and more improvements
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commit
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@ -1,11 +1,5 @@
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#!/bin/sh
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if ! lockfile-create -p -r 2 $0; 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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### Arguments ###
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DATASET=$1
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if test -z "$DATASET"; then
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@ -40,21 +34,33 @@ fi
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SNAPSHOT="$DATASET@$NAME"
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PREVIOUS_SNAPSHOT="$DATASET@$PREVIOUS_NAME"
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REMOTE_NAME="$TARGET_PATH/"$(echo -e $DATASET | sed -r "s/\//_/g")
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LOCK_NAME="${0}_"$(echo -e $DATASET | sed -r "s/\//_/g")
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### LOCK ###
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if ! lockfile-create -p -r 2 $LOCK_NAME; 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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# Take snapshot
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echo "Creating $SNAPSHOT snapshot..."
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zfs snapshot $SNAPSHOT || exit 1
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echo "Snapshot created."
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# Create snapshot
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exists=$(zfs list -H -t snapshot -o name $SNAPSHOT)
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if [ "$exists" = "$SNAPSHOT" ]; then
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echo "Snapshot $SNAPSHOT already exists, skip create."
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else
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echo "Creating $SNAPSHOT snapshot..."
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zfs snapshot $SNAPSHOT || exit 1
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echo "Snapshot created."
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fi
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# Send snapshot
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echo "Sending snapshot ($PREVIOUS_SNAPSHOT --- $SNAPSHOT) to $REMOTE_NAME ..."
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if test ! -z "$PREVIOUS_NAME"; then
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incr="-I $PREVIOUS_SNAPSHOT"
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fi
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zfs send -v -p $incr $SNAPSHOT | ssh $TARGET zfs receive -F $REMOTE_NAME || exit 1
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zfs send -v -p $incr $SNAPSHOT | ssh $TARGET zfs receive -F -s $REMOTE_NAME || exit 1
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echo "Snapshot sent."
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# Remove lock
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echo "Backup finished. Removing lock..."
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lockfile-remove $0
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### UNLOCK ###
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echo "Backup of $DATASET dataset finished. Removing lock..."
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lockfile-remove $LOCK_NAME
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@ -18,52 +18,74 @@ if test -z "$TARGET_PATH"; then
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exit 1
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fi
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### New snapshot ###
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NAME=$(date +%Y-%m-%d_%H-%M-%S)
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SNAPSHOT="$DATASET@$NAME"
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DATE=$4
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if test -z "$DATE"; then
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DATE=$(date +%Y-%m-%d_%H-%M)
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fi
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REMOTE_NAME="$TARGET_PATH/"$(echo -e $DATASET | sed -r "s/\//_/g")
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### Resume existing transfer ###
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RESUME_TOKEN=$(ssh $TARGET zfs get -H -p receive_resume_token -o value "$REMOTE_NAME")
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if [ "$RESUME_TOKEN" != "" ] && [ "$RESUME_TOKEN" != "-" ]; then
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echo "Resuming interrupted transfer..."
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zfs send -v -t "$RESUME_TOKEN" | ssh $TARGET zfs receive -F -s "$REMOTE_NAME" || exit 1
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echo "Resumed transfer finished."
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exit 0
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fi
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### Sync existing snapshots ###
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REMOTE_SNAPSHOTS=($(ssh $TARGET zfs list -H -t snapshot -o name -s creation $REMOTE_NAME | cut -d"@" -f 2))
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LOCAL_SNAPSHOTS=($(zfs list -H -t snapshot -o name -s creation $DATASET | cut -d"@" -f 2))
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echo "Remote snapshots: $REMOTE_SNAPSHOTS"
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for local_snapshot in "${LOCAL_SNAPSHOTS[@]}"; do
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echo "Syncing local snapshot $local_snapshot ..."
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found=false
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for remote_snapshot in "${REMOTE_SNAPSHOTS[@]}"; do
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if [ "$remote_snapshot" = "$local_snapshot" ] ; then
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found=true
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break
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fi
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done
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if [ $found = true ] ; then
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echo "> Found remotely, settings as last snapshot"
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LAST_SNAPSHOT=$local_snapshot
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EXISTING_SNAPSHOT=""
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else
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echo "> Needs sync"
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EXISTING_SNAPSHOT=$local_snapshot
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fi
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done
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### New snapshot ###
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if [ "$EXISTING_SNAPSHOT" = "" ]; then
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NAME=$DATE
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else
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NAME=$EXISTING_SNAPSHOT
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fi
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SNAPSHOT="$DATASET@$NAME"
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echo "New snapshot name is: $NAME"
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echo "New snapshot is: $SNAPSHOT"
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### Default last snapshot ###
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DEFAULT_LAST_SNAPSHOT=$(zfs list -t snapshot -o name -s creation -H $DATASET | tail -n 1)
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DEFAULT_LAST_NAME=$(echo -e $DEFAULT_LAST_SNAPSHOT | rev | cut -d"@" -f1 | rev)
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echo "Default last snapshot is: $DEFAULT_LAST_SNAPSHOT"
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echo "Default last snapshot name is: $DEFAULT_LAST_NAME"
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### Tracking folder ###
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tracking_folder="$HOME/.local/share/zfs_backup"
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if test ! -d $tracking_folder; then
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echo "Creating backup tracking files directory"
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mkdir -p $tracking_folder
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fi
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### Last snapshot ###
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LAST_SNAPSHOT=$DEFAULT_LAST_SNAPSHOT
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last_snapshot_file="$tracking_folder/last_snapshot_"$(echo -e $DATASET | sed -r "s/\//_/g")
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if test -f $last_snapshot_file; then
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LAST_SNAPSHOT=$(cat $last_snapshot_file)
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echo "Found $last_snapshot_file"
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else
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echo "No $last_snapshot_file, resolving to default"
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fi
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LAST_SNAPSHOT_NAME=$(echo -e $LAST_SNAPSHOT | rev | cut -d"@" -f1 | rev)
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echo "Last snapshot is: $LAST_SNAPSHOT"
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echo "Last snapshot name is: $LAST_SNAPSHOT_NAME"
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echo "Starting backup with args $DATASET $NAME $LAST_SNAPSHOT_NAME"
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$HOME/scripts/zfs_backup.sh $DATASET $NAME $LAST_SNAPSHOT_NAME $TARGET $TARGET_PATH || exit 1
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echo "Saving new snapshot in tracking folder..."
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echo -e $SNAPSHOT > $last_snapshot_file
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## Perform transfer
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echo "Starting backup with args $DATASET $NAME $LAST_SNAPSHOT"
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$HOME/scripts/zfs_backup.sh $DATASET $NAME "$LAST_SNAPSHOT" $TARGET $TARGET_PATH || exit 1
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## Destroy last snapshot
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echo "Destroying last snapshot..."
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zfs destroy $LAST_SNAPSHOT || exit 1
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zfs destroy "$DATASET@$LAST_SNAPSHOT" || exit 1
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echo "Backup finished."
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