#!/usr/bin/bash
# Usage: borg_partclone_backup.sh VGNAME LVNAME SNP_SZ SRV_HOST SRV_BORG_REPO
VGNAME=$1
LVNAME=$2
SNP_NM=$LVNAME-`date +%Y%m%dT%H%M%S`
SNP_SZ=$3
SRV_HOST=$4
SRV_BORG_REPO=$5

exitmsg () {
  echo $1 >&2;
  exit 1;
}

rmsnap () {
	# Remove the snapshot
	lvremove -y $VGNAME/$SNP_NM >/dev/null

}

exitmsg_rm () {
	rmsnap
  exitmsg $1
}

exit_ok () {
	rmsnap
	echo "Successful backup for $VGNAME/$LVNAME"
	exit 0
}


echo "Starting backup for $VGNAME/$LVNAME"

# Be root
test `id -u` == "0" || exitmsg "Run this script as root"

# Create the snapshot
lvcreate -y -n $SNP_NM -s -L $SNP_SZ $VGNAME/$LVNAME >/dev/null || exitmsg "Cannot create snapshot"

# Check filesystem
fsck -y /dev/$VGNAME/$SNP_NM || exitmsg_rm "Failed to check filesystem /dev/$VGNAME/$SNP_NM"

# Clone
partclone.ext4 -s /dev/$VGNAME/$SNP_NM -c -q >/dev/null 2>&1 | \
    BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=yes \
    borg2 -r ssh://$SRV_HOST$SRV_BORG_REPO create --stdin-name image.pcl $SNP_NM - || exitmsg_rm "Backup failed for $SNP_NM"

exit_ok