#!/bin/sh
#
# Description: Make dated copies (incs) of 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}")

    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}" "${inc_path}" | debug
    fi
}
create_inc_ext4() {
    jail_name=${1:?}
    inc_name=${2:?}

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

    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
}

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

jails_list=$(jails_list)
jails_total=$(echo $jails_list | wc -w)
jails_count=0

for jail_name in ${jails_list}; do
    jails_count=$((jails_count+1))
    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 "${incs_policy_file}" ]; then
        # If no incs directory is found, we don't create incs
        if [ ! -d "${inc_path}" ]; then
            info "Progress: jail ${jails_count} out of ${jails_total}"
            notice "Create inc \`${inc_name}' for jail \`${jail_name}' : start"

            if is_btrfs "${jail_path}"; then
                create_inc_btrfs "${jail_name}" "${inc_name}"
            else
                create_inc_ext4 "${jail_name}" "${inc_name}"
            fi

            notice "Create inc \`${inc_name}' for jail \`${jail_name}' : finish"
        else
            warning "Skip inc \`${inc_name}' for jail \`${jail_name}' : it already exists."
        fi
    else
        notice "Skip jail \`${jail_name}' : incs policy is missing"
    fi
done