124 lines
3.8 KiB
Bash
Executable File
124 lines
3.8 KiB
Bash
Executable File
#!/bin/bash
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# James W. Barnett
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# Takes snapshots of each snapper configuration. It then sends the snapshot to
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# a location on an external drive. After the initial transfer, it does
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# incremental snapshots on later calls. It's important not to delete the
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# snapshot created on your system since that will be used to determine the
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# difference for the next incremental snapshot.
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set -e
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declare -r description="latest incremental backup"
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if [[ $EUID -ne 0 ]]; then
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printf "Script must be run as root.\n"
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exit
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fi
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# It's important not to change this userdata in the snapshots, since that's how
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# we find the previous one.
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TARGETS="$(findmnt -n -v -t btrfs -o TARGET --list)"
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UUIDS="$(findmnt -n -v -t btrfs -o UUID --list)"
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declare -a TARGETS_ARRAY
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declare -a UUIDS_ARRAY
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i=0
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for x in $TARGETS; do
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TARGETS_ARRAY[$i]=$x
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i=$((i+1))
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done
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i=0
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for x in $UUIDS; do
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UUIDS_ARRAY[$i]=$x
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i=$((i+1))
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done
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printf "Selected a mounted BTRFS device to backup to.\n"
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disk=-1
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while [[ $disk -lt 0 || $disk -gt $i ]]; do
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for x in "${!TARGETS_ARRAY[@]}"; do
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printf "%s) %s (%s)\n" "$((x+1))" "${UUIDS_ARRAY[$x]}" "${TARGETS_ARRAY[$x]}"
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done
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printf "0) Exit\n"
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read -r -p "Enter a number: " disk
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done
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if [[ $disk == 0 ]]; then
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exit 0
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fi
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selected_uuid="${UUIDS_ARRAY[$((disk-1))]}"
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selected_mnt="${TARGETS_ARRAY[$((disk-1))]}"
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printf "You selected the disk with UUID %s.\n" "$selected_uuid"
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if [[ -f /etc/conf.d/snapper ]]; then
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source /etc/conf.d/snapper
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else
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printf "ERROR: /etc/conf.d/snapper does not exist!\n"
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exit 1
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fi
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for x in $SNAPPER_CONFIGS; do
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source /etc/snapper/configs/$x
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printf "At '%s' configuration\n" "$x"
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old_number=$(snapper -c "$x" list -t single | awk '/'"$selected_uuid"'/ {print $1}')
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old_snapshot=$SUBVOLUME/.snapshots/$old_number/snapshot
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if [[ -z "$old_number" ]]; then
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printf "No backups have been performed for '%s' on this disk.\n" "$x"
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read -r -p "Enter name of directory to store backups: " mybackupdir
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printf "This will be the initial backup for snapper configuration '%s' to this disk. This could take awhile.\n" "$x"
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BACKUPDIR="$selected_mnt/$mybackupdir"
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mkdir -p "$BACKUPDIR"
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else
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mybackupdir=$(snapper -c root list -t single | awk -F"|" '/'"$selected_uuid"'/ {print $5}' | awk -F "," '{print $1}' | awk -F"=" '{print $2}')
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BACKUPDIR="$selected_mnt/$mybackupdir"
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if [[ ! -d $BACKUPDIR ]]; then
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printf "ERROR: %s is not a directory on %s.\n" "$BACKUPDIR" "$selected_uuid"
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exit 1
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fi
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fi
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new_number=$(snapper -c "$x" create --print-number)
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new_snapshot=$SUBVOLUME/.snapshots/$new_number/snapshot
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new_info=$SUBVOLUME/.snapshots/$new_number/info.xml
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sync
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backup_location=$BACKUPDIR/$x/$new_number/
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printf "Backup location: %s\n" "$backup_location"
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read -r -n 1 -p "Continue (y/n)? " cont_backup
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printf "\n"
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if [[ "$cont_backup" != "y" ]]; then
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continue
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fi
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mkdir -p "$backup_location"
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if [[ -z "$old_number" ]]; then
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btrfs send "$new_snapshot" | btrfs receive "$backup_location" &>/dev/null
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else
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# Sends the difference between the new snapshot and old snapshot to the
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# backup location. Using the -c flag instead of -p tells it that there
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# is an identical subvolume to the old snapshot at the receiving
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# location where it can get its data. This helps speed up the transfer.
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btrfs send "$new_snapshot" -c "$old_snapshot" | btrfs receive "$backup_location" &>/dev/null
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cp "$new_info" "$backup_location"
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snapper -c "$x" delete "$old_number"
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fi
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userdata="backupdir=$mybackupdir, uuid=$selected_uuid"
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# Tag new snapshot as the latest
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snapper -v -c "$x" modify -d "$description" -u "$userdata" "$new_number"
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done
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printf "Done!\n"
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