100 lines
3.1 KiB
Bash
Executable File
100 lines
3.1 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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# Can set the backup directory here, or in the snapper configuration file with
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# EXT_BACKUP_LOCATION
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declare -r mybackupdir="/run/media/wes/backup/acer-c720"
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# You can set a snapper configuration to be excluded by setting EXT_BACKUP="no"
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# in its snapper configuration file.
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#--------------------------------------------------------
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# Don't modify anything below here
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set -e
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if [[ $EUID -ne 0 ]]; then
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echo "Script must be run as root."
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exit
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fi
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declare -r description="latest incremental backup"
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# It's important not to change this userdata in the snapshots, since that's how
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# we find the previous one.
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UUID="$(blkid -L backup | awk -F'/' '{print $4}')"
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declare -r userdata="uuid=$UUID"
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#declare -r userdata="extbackup=yes"
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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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echo "ERROR: /etc/conf.d/snapper does not exist!"
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exit 1
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fi
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for x in $SNAPPER_CONFIGS; do
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# shellcheck source=/dev/null
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source /etc/snapper/configs/$x
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do_backup=${EXT_BACKUP:-"yes"}
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if [[ $do_backup == "yes" ]]; then
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BACKUPDIR=${EXT_BACKUP_LOCATION:-"$mybackupdir"}
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if [[ -z $BACKUPDIR ]]; then
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echo "ERROR: External backup location not set!"
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exit 1
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elif [[ ! -d $BACKUPDIR ]]; then
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echo "ERROR: $BACKUPDIR is not a directory."
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exit 1
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fi
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old_number=$(snapper -c "$x" list -t single | awk '/'"$userdata"'/ {print $1}')
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new_number=$(snapper -c "$x" create --print-number)
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sync
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new_snapshot=$SUBVOLUME/.snapshots/$new_number/snapshot
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new_info=$SUBVOLUME/.snapshots/$new_number/info.xml
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backup_location=$BACKUPDIR/$x/$new_number/
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mkdir -p "$backup_location"
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if [[ -z "$old_number" ]]; then
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echo "Performing initial backup for snapper configuration '$x'. This could take awhile..."
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btrfs send "$new_snapshot" | btrfs receive "$backup_location"
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else
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old_snapshot=$SUBVOLUME/.snapshots/$old_number/snapshot
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# Sends the difference between the new snapshot and old snapshot to
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# the backup location. Using the -c flag instead of -p tells it that
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# there is an identical subvolume to the old snapshot at the
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# receiving location where it can get its data. This helps speed up
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# the transfer.
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btrfs send "$new_snapshot" -c "$old_snapshot" | btrfs receive "$backup_location"
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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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# 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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fi
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done
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date > "$HOME"/.lastbackup
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