#!/bin/sh
#
# Remove old incremtal inc of all jails
# Usage: rm
#

# shellcheck source=./config
LIBDIR="$(dirname $0)" && . "${LIBDIR}/config"

relative_date() {
    format=$(echo $1 | cut -d'.' -f1)
    time_jump=$(echo $1 | cut -d'.' -f2)

    reference_date=$(date "${format}")
    past_date=$(date --date "${reference_date} ${time_jump}" +"%Y-%m-%d")

    echo ${past_date}
}

remove_inc() {
    jail=$1
    inc=$2

    start=$(date +"%H:%M:%S")
    inc_inode=$(stat --format=%i "${INCDIR}/${jail}/${inc}")
    if [ "${inc_inode}" -eq 256 ]; then
        /bin/btrfs subvolume delete "${INCDIR}/${jail}/${inc}" | debug
        end=$(date +"%H:%M:%S")
        notice "${jail} : deleted ${inc} inc [${start}/${end}]"
    else
        lock="/run/lock/bkctld/rm-${jail}.lock"
        if [ -f "${lock}" ]; then
            warning "${jail} : trying to run already running rm"
        else
            (
                empty="/tmp/bkctld-${$}-$(date +%N)"
                mkdir -p /run/lock/bkctld && touch "${lock}" && mkdir -p "${empty}"
                trap "rm -f ${lock} && rmdir ${empty}" 0
                rsync -a --delete "${empty}/" "${INCDIR}/${jail}/${inc}/"
                rmdir "${INCDIR}/${jail}/${inc}/"
                end=$(date +"%H:%M:%S")
                notice "${jail} : deleted ${inc} inc [${start}/${end}]"
            )
        fi
    fi
}

for jail in $("${LIBDIR}/bkctld-list"); do
    incs=$(ls "${INCDIR}/${jail}")

    if [ -f "${CONFDIR}/${jail}.d/incs_policy" ]; then
        incs_policy_file="${CONFDIR}/${jail}.d/incs_policy"
    elif [ -f "${CONFDIR}/${jail}" ]; then
        incs_policy_file="${CONFDIR}/${jail}"
    else
        incs_policy_file=""
    fi

    if [ -n "${incs_policy_file}" ]; then
        incs_policy_keep_file="$(mktemp)"

        # loop for each line in jail configuration
        for incs_policy_line in $(cat ${incs_policy_file}); do
            # inc date in ISO format
            incs_policy_date=$(relative_date ${incs_policy_line})
            echo ${incs_policy_date} >> "${incs_policy_keep_file}"
        done

        for inc in $(echo "${incs}" | grep -v -f "${incs_policy_keep_file}"); do
            remove_inc "${jail}" "${inc}"
        done
        rm "${incs_policy_keep_file}"
    fi
done