#!/bin/sh

lockfile="/tmp/duplicacy.lock"
LOGFILE="/var/log/duplicacy/duplicacy_$(date +%Y%m%d-%H%M%S).log"

if [ -e ${lockfile} ] && kill -0 `cat ${lockfile}`; then
        echo "duplicacy 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}

# Duplicacy version update
LATEST_DUPLICACY_VERSION="2.6.1"
INSTALLED_DUPLICACY_VERSION=$(duplicacy -h | awk '/VERSION:/{getline; print $1}')
if [ ${LATEST_DUPLICACY_VERSION} != ${INSTALLED_DUPLICACY_VERSION} ]; then
        # Determine the Kernel and Architecture
        KERNEL=$(uname)
        ARCH=$(uname -m)
        if [ ${KERNEL} == 'Linux' ]; then
                if [ ${ARCH} == 'x86_64' ]; then
                        cp -v $(dirname "$0")/binaries/duplicacy_linux_x64_2.6.1 /usr/bin/duplicacy >> ${LOGFILE}
                        chmod +x /usr/bin/duplicacy >> ${LOGFILE}
                elif [ ${ARCH} == 'aarch64' ]; then
                        cp -v $(dirname "$0")/binaries/duplicacy_linux_arm64_2.6.1 /usr/bin/duplicacy >> ${LOGFILE}
                        chmod +x /usr/bin/duplicacy >> ${LOGFILE}
                else
                        echo "Kernel Type: ${KERNEL}"
                        echo "Arch: ${ARCH}"
                        echo "Arch not supported."
                exit
                fi
        elif [ ${KERNEL} == 'FreeBSD' ]; then
                if [ ${ARCH} == 'amd64' ]; then
                        cp -v $(dirname "$0")/binaries/duplicacy_freebsd_x64_2.6.1 /usr/bin/duplicacy >> ${LOGFILE}
                        chmod +x /usr/bin/duplicacy >> ${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

# 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

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

# clean up lockfile
rm -f ${lockfile}