snippets/bash/backup-remote.sh
2022-08-19 23:59:53 +02:00

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#!/bin/bash
##
# Sync with remote server and create Btrfs snapshots
#
# This scripts uses rsync to sync remote directories with a local copy
# After every successful sync a readonly Btrfs snapshot of this copy is
# created
#
# This script requires root privileges for creating Btrfs snapshots.
# Consider using public key authentification with SSH to allow root
# logins on remote machines:
#
# On remote side:
# echo "PermitRootLogin without-password" >> /etc/ssh/sshd_config:
#
# On local side:
# sudo ssh-keygen
# sudo cat /root/.ssh/id_dsa.pub | ssh user@remote 'cat >> /root/.ssh/authorized_keys'
#
# @copyright 2021, Steffen Vogel
# @license http://www.gnu.org/licenses/gpl.txt GNU Public License
# @author Steffen Vogel <post@steffenvogel.de>
# @link https://www.steffenvogel.de
##
function usage {
echo "Usage: $(basename $0) SOURCE DEST"
echo
echo " SOURCE a path to the subvolume to backup"
echo " DEST a path to the backup destination"
exit 1
}
set -e
if [ $# -ne 2 ]; then
echo -e "invalid args!"
echo
usage
fi
DATE=$(date +%F_%H-%M-%S)
SRC=$1
DEST=$(readlink -f $2)
if ! btrfs sub show $DEST/.current &> /dev/null; then
if [ -d $DEST/.current ]; then
echo -e "destination directory exists and is not a valid btrfs subvolume!"
echo
usage
else
btrfs sub create $DEST/.current
fi
fi
# rsync options
OPTS="--archive --acls --xattrs"
#OPTS+=" --progress --human-readable"
OPTS+=" --delete --delete-excluded"
OPTS+=" --exclude /dev/"
OPTS+=" --exclude /proc/"
OPTS+=" --exclude /sys/"
OPTS+=" --exclude /tmp/"
OPTS+=" --exclude /run/"
OPTS+=" --exclude /mnt/"
OPTS+=" --exclude /media/"
OPTS+=" --exclude /lost+found/"
# sync with remote
rsync $OPTS $SRC $DEST/.current/
# create new readonly snapshot
btrfs subvolume snapshot -r $DEST/.current $DEST/$DATE
# create symlink to latest snapshot
ln -rsfT $DEST/$DATE $DEST/latest