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

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

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

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

    # The lock file prevents from starting a new copy when one is already being done
    lock_file="${LOCKDIR}/inc-${jail_name}-${inc_name}.lock"
    if [ -f "${lock_file}" ]; then
        warning "${jail_name}: skipping '${inc_name}', it is already being created."
    else
        (
            start=$(current_time)
            mkdir --parents "${LOCKDIR}" && touch "${lock_file}"
            # shellcheck disable=SC2064
            trap "rm -f ${lock_file}" 0

            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 '${inc_name}' has been created [${start}/${end}]"
        )
    fi
}
create_inc_ext4() {
    jail_name=$1
    inc_name=$2

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

    # The lock file prevents from starting a new copy when one is already being done
    lock_file="${LOCKDIR}/inc-${jail_name}-${inc_name}.lock"
    if [ -f "${lock_file}" ]; then
        warning "${jail_name}: skipping '${inc_name}', it is already being created."
    else
        (
            start=$(current_time)
            mkdir --parents "${LOCKDIR}" && touch "${lock_file}"
            # shellcheck disable=SC2064
            trap "rm -f ${lock_file}" 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}: in '${inc_name}' has been created [${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=$(current_jail_incs_policy_file ${jail_name})

    # If no 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}" "${inc_name}"
            else
                create_inc_ext4 "${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