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

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

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}
}

delete_inc_btrfs() {
    jail_name=$1
    inc_name=$2

    inc_path=$(inc_path "${jail_name}" "${inc_name}")

    start=$(current_time)

    if dry_run; then
        echo "[dry-run] delete btrfs subvolume ${inc_path}"
    else
        /bin/btrfs subvolume delete "${inc_path}" | debug
    fi

    end=$(current_time)
    notice "${jail_name} : ${inc_name} inc deleted [${start}/${end}]"
}
delete_inc_ext() {
    jail_name=$1
    inc_name=$2

    inc_path=$(inc_path "${jail_name}" "${inc_name}")

    lock_file="${LOCKDIR}/rm-${jail_name}.lock"
    if [ -f "${lock_file}" ]; then
        warning "${jail_name} : skipping ${inc_name}, it is already being deleted."
    else
        (
            mkdir --parents "${LOCKDIR}" && touch "${lock_file}" || error "Failed to acquire lock file '${lock_file}'"
            empty=$(mktemp -d --suffix ".${$}" bkctld.XXXXX)
            # shellcheck disable=SC2064
            trap "rm -f ${lock_file}; rmdir ${empty}" 0

            if dry_run; then
                echo "[dry-run] delete ${inc_path} with rsync from ${empty}"
            else
                rsync --archive --delete "${empty}/" "${inc_path}/"
            fi
            rmdir "${inc_path}/"

            end=$(current_time)
            notice "${jail_name} : ${inc_name} inc deleted [${start}/${end}]"
        )
    fi
}

for jail_name in $(jails_list); do
    incs_policy_file=$(jail_incs_policy_file ${jail_name})

    # If not incs policy if found, we don't remove incs
    if [ -n "${incs_policy_file}" ]; then
        incs_policy_keep_file="$(mktemp)"
        # shellcheck disable=SC2064
        trap "rm ${incs_policy_keep_file}" 0

        # loop for each line in jail configuration
        for incs_policy_line in $(cat ${incs_policy_file} | grep "^\+"); do
            # inc date in ISO format
            incs_policy_date=$(relative_date ${incs_policy_line})
            echo ${incs_policy_date} >> "${incs_policy_keep_file}"
        done
        # shellcheck disable=SC2046
        incs_to_delete=$(echo $(incs_list "${jail_name}") | grep -v -f "${incs_policy_keep_file}")

        for inc_name in ${incs_to_delete}; do
            inc_path=$(inc_path "${jail_name}" "${inc_name}")
            if is_btrfs "${inc_path}"; then
                delete_inc_btrfs "${jail_name}" "${inc_name}"
            else
                delete_inc_ext "${jail_name}" "${inc_name}"
            fi
        done
    fi
done