#!/bin/sh

LOCKFILE="/tmp/restic.lock"
LOGFILE="/var/log/restic/restic_$(date +%Y%m%d-%H%M%S).log"
LATEST_RESTIC_VERSION="0.12.1"

# make log directory
if [ ! -d $(dirname ${LOGFILE}) ]; then
        mkdir $(dirname ${LOGFILE}) > /dev/null
fi

if [ -e ${LOCKFILE} ] && kill -0 `cat ${LOCKFILE}`; then
        echo "Restic backup already running" >> ${LOGFILE}
        exit
fi

# make sure the lockfile is removed when we exit and then claim it
trap "rm -f ${LOCKFILE}; exit" INT TERM EXIT
echo $$ > ${LOCKFILE}

# self update
cd $(dirname "$0")
git pull > /dev/null

# restic version update
INSTALLED_RESTIC_VERSION=$(restic version | awk '{print $2}')
if [ "${LATEST_RESTIC_VERSION}" != "${INSTALLED_RESTIC_VERSION}" ] || [ ! -e '/usr/bin/restic' ]; then
        # Determine the Kernel and Architecture
        KERNEL=$(uname)
        ARCH=$(uname -m)
        if [ ${KERNEL} == 'Linux' ]; then
                if [ ${ARCH} == 'x86_64' ]; then
                        curl -vL -o /usr/bin/restic.bz2 https://github.com/restic/restic/releases/download/v${LATEST_RESTIC_VERSION}/restic_${LATEST_RESTIC_VERSION}_linux_amd64.bz2 >> ${LOGFILE} 2>&1
						bzip2 -fvd /usr/bin/restic.bz2 >> ${LOGFILE}
                        chmod +x /usr/bin/restic >> ${LOGFILE}
                elif [ ${ARCH} == 'aarch64' ]; then
                        curl -vL -o /usr/bin/restic.bz2 https://github.com/restic/restic/releases/download/v${LATEST_RESTIC_VERSION}/restic_${LATEST_RESTIC_VERSION}_linux_arm64.bz2 >> ${LOGFILE} 2>&1
                        bzip2 -fvd /usr/bin/restic.bz2 >> ${LOGFILE}
						chmod +x /usr/bin/restic >> ${LOGFILE}
                else
                        echo "Kernel Type: ${KERNEL}"
                        echo "Arch: ${ARCH}"
                        echo "Arch not supported."
                exit
                fi
        elif [ ${KERNEL} == 'FreeBSD' ]; then
                if [ ${ARCH} == 'amd64' ]; then
                        curl -vL -o /usr/bin/restic.bz2 https://github.com/restic/restic/releases/download/v${LATEST_RESTIC_VERSION}/restic_${LATEST_RESTIC_VERSION}_freebsd_amd64.bz2 >> ${LOGFILE} 2>&1
                        bzip2 -fvd /usr/bin/restic.bz2 >> ${LOGFILE}
						chmod +x /usr/bin/restic >> ${LOGFILE}
                else
                        echo "Kernel Type: ${KERNEL}"
                        echo "Arch: ${ARCH}"
                        echo "Arch not supported."
                exit
                fi
        else
                echo "Kernel Type: ${KERNEL}"
                echo "Arch: ${ARCH}"
                echo "Kernel not supported."
                exit
        fi
fi

# check if the /.duplicacy/preferences file exists before continuing
if [ ! -e "/.duplicacy/preferences" ] || [ ! -e "/.duplicacy/filters" ]; then
        echo "ERROR: Duplicacy not yet configured.  Please refer to readme file"
        exit
fi

# run the backup
cd /
duplicacy -verbose -log backup -stats >> ${LOGFILE} 2>&1

# prune the backup
duplicacy -verbose -log prune -keep 0:360 -keep 30:180 -keep 7:30 -keep 1:7 >> ${LOGFILE} 2>&1

# copy the backup to offsite but only if the backup id as passed in
if [ "${1}" == "--copyOffsite" ] || [ "${1}" == "-c" ]; then
        BACKUP_ID=$(awk '/"id"/{print substr($2,2,length($2)-3);exit}' /.duplicacy/preferences)
        duplicacy -verbose -log copy -to GauntBackupCRO -id ${BACKUP_ID} >> ${LOGFILE} 2>&1
        duplicacy -verbose -log copy -to GauntBackupGail -id ${BACKUP_ID} >> ${LOGFILE} 2>&1
        duplicacy -verbose -log copy -to GauntBackupNAS -id ${BACKUP_ID} >> ${LOGFILE} 2>&1
fi

# compress the logs
gzip $(dirname ${LOGFILE})/*.log

# clean up lockfile
rm -f ${LOCKFILE}