#!/bin/bash

set -eu

if [ "$(id -u)" -ne 0 ]; then
    echo "Must be root"
    exit 1
fi

if pgrep backup > /dev/null; then
    echo "Backup is still running!"
    exit 1
fi

if [ -z "${1:-}" ]; then
    echo "Usage: $0 root"
    exit 1
fi

BACKUP_PROFILE="$1"
source "/etc/borg/${BACKUP_PROFILE}/env"
HOME=/root

ionice -c 3 -p $$
renice -n 19 -p $$ > /dev/null

if [ "$BACKUP_SNAP" -eq 1 ]; then
    echo ">>> Snapshotting"
    bsnap on
fi

cd "$BACKUP_PATH"

echo ">>> Starting backup"
borg create \
    $([ -t 0 ] && echo --progress) \
    --info --stats \
    --compression lz4 \
    --exclude-from "/etc/borg/${BACKUP_PROFILE}/exclude" \
    "${BACKUP_REPO}::{hostname}-{now}" .

echo ">>> Pruning old backups"
borg prune \
    --info --stats \
    --keep-daily=7 \
    --keep-weekly=4 \
    --keep-monthly=12 \
    --prefix='{hostname}-' \
    "$BACKUP_REPO"

cd /

if [ "$BACKUP_SNAP" -eq 1 ]; then
    echo ">>> Unsnapshotting"
    bsnap off
fi

exit 0