#!/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 env="$1"
	if lib_check_empty "${env}"; then
		lib_err ${EX_USAGE} "usage: ENV <name>[=<value>]"
	fi

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

	if ! lib_check_var "${env}"; then
		lib_err ${EX_DATAERR} -- "${env}: Invalid environment variable."
	fi

	local name=`lib_jailparam_name "${env}" "="`
	local value=`lib_jailparam_value "${env}" "="`

	if lib_check_empty "${value}"; then
		lib_err ${EX_DATAERR} -- "${name}: this environment variable requires a value."
	fi

	value=`"${SCRIPTSDIR}/escape-env-val.sh" "${value}" "internal"`

	env="\\\"${name}=${value}\\\""

	local env_vars
	# The user environment variables must override the environment variables defined by
	# the Makejail to honor the intent.
	local env_tmp="${envdir}/${MAKEJAIL_CURRENT_STAGE}.tmp"
	if [ -f "${env_tmp}" ]; then
		env_vars="${env} `head -1 "${env_tmp}"`"
		rm -f "${env_tmp}"
	else
		env_vars="${env}"
	fi

	if ! printf "%s " "${env_vars}" >> "${envdir}/${MAKEJAIL_CURRENT_STAGE}"; then
		lib_err ${EX_IOERR} "Error writing in ${envdir}/${MAKEJAIL_CURRENT_STAGE}"
	fi
}

main "$@"
