#!/bin/sh
#
# Copyright (c) 2022-2023, Jesús Daniel Colmenares Oviedo <DtxdF@disroot.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

. "${AJ_CONFIG}"
. "${LIBDIR}/load"

lib_load "${LIBDIR}/log"
lib_load "${LIBDIR}/check_func"
lib_load "${LIBDIR}/jail"
lib_load "${LIBDIR}/replace"

main()
{
	local args="$1"
	if lib_check_empty "${args}"; then
		lib_err - "usage: FROM [--ajspec <name>] [--entrypoint [<entrypoint>|none]] [--platform"
		lib_err - "               <platform>] <image>[:<tag>]"
		exit ${EX_USAGE}
	fi

	if [ -d "${MAKEJAIL_TEMPDIR}/images" ]; then
		lib_err ${EX_IOERR} "FROM cannot be used more than once."
	fi
	
	# Options
	local ajspec=".ajspec"
	local entrypoint=
	local platform="${IMAGE_ARCH}"
	
	# Arguments
	local has_args=0
	local args_list
	local total_items
	local current_index=0

	args_list=`lib_split_jailparams "${args}"` || exit $?
	total_items=`printf "%s\n" "${args_list}" | wc -l`
	
	while [ ${current_index} -lt ${total_items} ]; do 
		current_index=$((current_index+1))
		local arg=`printf "%s\n" "${args_list}" | head -${current_index} | tail -n 1`
		if lib_check_empty "${arg}"; then
			continue
		fi

		local optarg=
		case "${arg}" in
			--ajspec|--entrypoint|--platform)
				current_index=$((current_index+1))
				if [ ${current_index} -eq ${total_items} ]; then
					main # usage
				fi

				optarg=`printf "%s\n" "${args_list}" | head -${current_index} | tail -n 1`
				if lib_check_empty "${optarg}"; then
					main # usage
				fi
				;;
		esac

		case "${arg}" in
			--ajspec)
				ajspec="${optarg}"
				;;
			--entrypoint)
				entrypoint="${optarg}"
				;;
			--platform)
				platform="${optarg}"
				;;
			--)
				has_args=1
				break
				;;
			--*)
				main # usage
				;;
			*)
				has_args=1
				break
				;;
		esac
	done
	current_index=$((current_index-1))

	if [ ${has_args} -eq 0 -o ${current_index} -eq ${total_items} ]; then
		main # usage
	fi

	local image name tag

	current_index=$((current_index+1))
	image=`printf "%s\n" "${args_list}" | head -${current_index} | tail -n 1`

	if lib_check_empty "${image}"; then
		main # usage
	fi

	name=`lib_jailparam_name "${image}" :`
	tag=`lib_jailparam_value "${image}" :`

	if lib_check_empty "${tag}"; then
		tag="${IMAGE_TAG}"
	fi

	local imagesdir="${MAKEJAIL_TEMPDIR}/images"
	if ! mkdir -p "${imagesdir}"; then
		lib_err ${EX_IOERR} "Error creating ${imagesdir}"
	fi

	local escape_chars
	escape_chars='`"\'

	platform=`lib_escape_string "${platform}" "" "${escape_chars}"`
	if ! printf "%s\n" "${platform}" > "${imagesdir}/platform"; then
		lib_err ${EX_IOERR} "Error writing in ${imagesdir}/platform"
	fi

	local escape_name=`lib_escape_string "${name}" "" "${escape_chars}"`
	if ! printf "%s\n" "${escape_name}" > "${imagesdir}/name"; then
		lib_err ${EX_IOERR} "Error writing in ${imagesdir}/name"
	fi

	tag=`lib_escape_string "${tag}" "" "${escape_chars}"`
	if ! printf "%s\n" "${tag}" > "${imagesdir}/tag"; then
		lib_err ${EX_IOERR} "Error writing in ${imagesdir}/tag"
	fi

	if lib_check_empty "${entrypoint}"; then
		entrypoint="${IMAGE_ENTRYPOINT}/${name}"
	fi

	if [ "${entrypoint}" != "none" ]; then
		ajspec=`lib_escape_string "${ajspec}" "" "${escape_chars}"`
		entrypoint=`lib_escape_string "${entrypoint}" "" "${escape_chars}"`

		echo "\"\${APPJAIL_SCRIPT}\" image import -a \"${platform}\" -N "${ajspec}" -n \"${escape_name}\" -t \"${tag}\" -- \"${entrypoint}\""
	fi
}

main "$@"
