#!/bin/sh
#
# Make incremental inc of all jails
# Usage: inc
#

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

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

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

    start=$(current_time)

    if dry_run; then
        echo "[dry-run] btrfs subvolume snapshot of ${jail_path} to ${inc_path}"
    else
        mkdir --parents "$(dirname "${inc_path}")"
        # create a btrfs readonly snapshot from the jail
        /bin/btrfs subvolume snapshot -r "${jail_path}" "${inc_path}" | debug
    fi

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

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

    lock="${LOCKDIR}/inc-${jail_name}.lock"
    if [ -f "${lock}" ]; then
        warning "${jail_name} : skipping ${inc_name}, it is already being created."
    else
        (
            start=$(current_time)
            mkdir --parents "${LOCKDIR}" && touch "${lock}"
            # shellcheck disable=SC2064
            trap "rm -f ${lock}" 0

            if dry_run; then
                echo "[dry-run] copy of ${jail_path} to ${inc_path}"
            else
                mkdir --parents "$(dirname "${inc_path}")"
                # create a copy of the jail with hard links
                cp --archive --link --one-file-system "${jail_path}/" "${inc_path}"
            fi

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

inc_name=$(date +"%Y-%m-%d-%H")

for jail_name in $(jails_list); do
    jail_path=$(jail_path "${jail_name}")
    inc_path=$(inc_path "${jail_name}" "${inc_name}")
    incs_policy_file=$(jail_incs_policy_file ${jail_name})

    # If not incs policy is found, we don't create incs
    if [ -n "${incs_policy_file}" ]; then
        # If not incs directory is found, we don't create incs
        if [ ! -d "${inc_path}" ]; then
            if is_btrfs "${jail_path}"; then
                create_inc_btrfs "${jail_name}" "${inc_name}"
            else
                create_inc_ext "${jail_name}" "${inc_name}"
            fi
        else
            warning "${jail_name} : skipping ${inc_name}, it already exists."
        fi
    else
        warning "${jail_name} : skipping ${inc_name}, incs policy not found."
    fi
done