84 lines
2.4 KiB
Bash
84 lines
2.4 KiB
Bash
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#!/usr/bin/env bash
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set -euxo pipefail
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# Parse arguments
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function help {
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echo "Usage: $0 [-h|-i] volume"
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echo "Backup BTRFS subvolume on rapido to razmo."
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echo
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echo "Arguments:"
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echo " volume: Name of the subvolume to backup"
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echo
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echo "Options:"
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echo " -h: Display this help message."
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echo " -i: Don't fail if the receiving subvolume doesn't exist."
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}
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init=false
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while getopts "hi" OPTION
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do
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case "$OPTION" in
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h)
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help
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exit 0
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;;
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i)
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init=true
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;;
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?)
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help
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exit 2
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;;
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esac
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done
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shift "$((OPTIND - 1))"
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if [ "$#" -ne 1 ]
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then
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help
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exit 2
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fi
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volume="$1"
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# Assertions
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[ -d "/mnt/rapido/${volume}" ]
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[ -d "/mnt/rapido/${volume}.bkp" ] || "$init"
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[ ! -d "/mnt/rapido/${volume}.new" ]
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[ -d "/mnt/razmo/${volume}.bkp" ] || "$init"
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[ -d "/mnt/razmo/${volume}" ] || "$init"
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[ ! -d "/mnt/razmo/${volume}.new" ]
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[ ! -d "/mnt/razmo/${volume}.snapshots" ]
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# Taking a snapshot of the running subvolume
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btrfs subvolume snapshot -r "/mnt/rapido/${volume}" "/mnt/rapido/${volume}.new"
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# Sending (the difference with) the last backup to the backup disk
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function error_handler() {
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btrfs subvolume delete "/mnt/rapido/${volume}.new" || true
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btrfs subvolume delete "/mnt/razmo/${volume}.new" || true
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}
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trap error_handler ERR
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if [ -d "/mnt/rapido/${volume}.bkp" ]
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then
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btrfs send -p "/mnt/rapido/${volume}.bkp" "/mnt/rapido/${volume}.new" | btrfs receive /mnt/razmo
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else
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btrfs send "/mnt/rapido/${volume}.new" | btrfs receive /mnt/razmo
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fi
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trap - ERR
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# Removing old backups and putting the new one in place
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[ ! -d "/mnt/rapido/${volume}.bkp" ] || btrfs subvolume delete "/mnt/rapido/${volume}.bkp"
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mv "/mnt/rapido/${volume}.new" "/mnt/rapido/${volume}.bkp"
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[ ! -d "/mnt/razmo/${volume}.bkp" ] || btrfs subvolume delete "/mnt/razmo/${volume}.bkp"
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mv "/mnt/razmo/${volume}.new" "/mnt/razmo/${volume}.bkp"
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# Create a writeable clone in case we need to boot on the HDD
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# Needs to move away then back the .snapshots folder
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[ ! -d "/mnt/razmo/${volume}/.snapshots" ] || mv "/mnt/razmo/${volume}/.snapshots" "/mnt/razmo/${volume}.snapshots"
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[ ! -d "/mnt/razmo/${volume}" ] || btrfs subvolume delete "/mnt/razmo/${volume}"
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btrfs subvolume snapshot "/mnt/razmo/${volume}.bkp" "/mnt/razmo/${volume}"
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[ ! -d "/mnt/razmo/${volume}.snapshots" ] || mv "/mnt/razmo/${volume}.snapshots" "/mnt/razmo/${volume}/.snapshots"
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sync
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