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#
# set +o errexit -o noglob -o nounset is assumed.
#

#
# exp_pkg_env_defaults() - set package variable defaults for single named package
# @_build_steps_default:	list of default build steps
# @_pkg_name:			single package name
# @_workdir:			pathname to build-specific temporary directory
#
# Return:			zero (0) on success, non-zero (>0) on failure
#
exp_pkg_env_defaults() {
	local _epped_build_steps_default="${1}" _epped_pkg_name="${2}" _epped_workdir="${3}";

	: ${PKG_NAME:="${_epped_pkg_name}"};
	: ${MIDIPIX_BUILD_PWD:="$(pwd)"};
	: ${PKG_BASE_DIR:="${_epped_workdir}/${_epped_pkg_name}-${PKG_BUILD_TYPE}-${PKG_TARGET}"};

	if [ "${PKG_BUILD_STEPS_DISABLE:+1}" = 1 ]; then
		rtl_lfilter2 \$_epped_build_steps_default \$PKG_BUILD_STEPS "${PKG_BUILD_STEPS_DISABLE:-}";
	else
		: ${PKG_BUILD_STEPS:="${_epped_build_steps_default}"};
	fi;

	if [ "${PKG_URL:+1}" = 1 ]; then
		: ${PKG_FNAME:="${PKG_URL##*/}"};
	fi;

	if [ "${PKG_SUBDIR:+1}" != 1 ]; then
		if [ "${PKG_URLS_GIT:+1}" = 1 ]\
		&& [ "${PKG_FNAME:+1}" = 1 ]; then
			rtl_log_msg "fatalexit" "${MSG_pkg_fail_missing_vars}";
		elif [ "${PKG_URLS_GIT:+1}" = 1 ]; then
			PKG_SUBDIR="${PKG_URLS_GIT%%=*}";
		else case "${PKG_FNAME:-}" in
		*.t*)	PKG_SUBDIR="${PKG_FNAME%%.t*}"; ;;
		*)	PKG_SUBDIR="${_epped_pkg_name}"; ;;
		esac; fi;
	fi;

	if [ "${PKG_BUILD_DIR:+1}" != 1 ]; then
		case "${PKG_IN_TREE:-0}" in
		0) PKG_BUILD_DIR="obj"; ;;
		1) PKG_BUILD_DIR="${PKG_SUBDIR}"; ;;
		esac;
	fi;

	PKG_BUILD_DIR="${PKG_BASE_DIR}/${PKG_BUILD_DIR}";
	PKG_CONFIGURE="${PKG_BASE_DIR}/${PKG_CONFIGURE:-${PKG_SUBDIR}/configure}";
	PKG_DESTDIR="${PKG_BASE_DIR}/${PKG_DESTDIR:-destdir}";
	PKG_DESTDIR_HOST="${PKG_BASE_DIR}/${PKG_DESTDIR_HOST:-destdir_host}";

	return 0;
};

#
# exp_pkg_env_set() - set package variables for single named package
# @_build_vars_default:	list of default build variables
# @_group_name:		build group name
# @_pkg_name:		single package name
#
# Sets package variables from either defaults, defaults specific to build type,
# build group, package to inherit from if any, or package for a single named
# package, and exports variables optionally named in ${PKG_ENV_VARS_EXTRA}.
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_env_set() {
	local	_eppes_build_vars_default="${1}" _eppes_group_name="${2}" _eppes_pkg_name="${3}"		\
		_eppes_cmd_name="" _eppes_lvars="" _eppes_var_prefixes="" _eppes_vars_set=""			\
		_eppes_vars_unset="" _eppes_vname="" _eppes_vnames="" IFS IFS0;

	rtl_set_vars _eppes_vars_set BUILD_TYPE "DEFAULT ${_eppes_group_name} PKG_${_eppes_pkg_name}";
	rtl_set_vars _eppes_vars_set INHERIT_FROM "PKG_${_eppes_pkg_name}";
	_eppes_var_prefixes="DEFAULT DEFAULT_${PKG_BUILD_TYPE} ${_eppes_group_name}";
	rtl_toupper \$_eppes_var_prefixes;
	rtl_lfilter2 \$_eppes_build_vars_default \$_eppes_vnames BUILD_TYPE;

	for _eppes_vname in ${_eppes_vnames}; do
		if [ "${PKG_INHERIT_FROM:+1}" = 1 ]; then
			_eppes_lvars="PKG_${PKG_INHERIT_FROM} PKG_${PKG_INHERIT_FROM}_${BUILD_KIND} PKG_${_eppes_pkg_name} PKG_${_eppes_pkg_name}_${BUILD_KIND}";
			rtl_toupper \$_eppes_lvars;
			rtl_lconcat2 \$_eppes_lvars \$_eppes_var_prefixes "${_eppes_lvars}";
			rtl_set_vars _eppes_vars_set "${_eppes_vname}" "${_eppes_lvars}";
		else
			_eppes_lvars="PKG_${_eppes_pkg_name} PKG_${_eppes_pkg_name}_${BUILD_KIND}";
			rtl_toupper \$_eppes_lvars;
			rtl_lconcat2 \$_eppes_lvars \$_eppes_var_prefixes "${_eppes_lvars}";
			rtl_set_vars _eppes_vars_set "${_eppes_vname}" "${_eppes_lvars}";
		fi;
	done;

	IFS0="${IFS:- }"; IFS=":"; for _eppes_vname in ${PKG_ENV_VARS_EXTRA:-}; do
		export "${_eppes_vname}";
	done; IFS="${IFS0}";

	for _eppes_vname in AR CC CXX PKG_CONFIG RANLIB; do
		if eval [ '"${PKG_'"${_eppes_vname}"':+1}"' = 1 ]\
		&& eval [ '"${PKG_'"${_eppes_vname}"'#/}"' = '"${_eppes_cmd_name:=${PKG_'"${_eppes_vname}"'}}"' ]; then
			eval PKG_${_eppes_vname}='$(which "${_eppes_cmd_name}")';
		fi; _eppes_cmd_name="";
	done;

	return 0;
};

#
# ex_pkg_env() - set package variables for single named package
# @_build_steps_default:	list of default build steps
# @_build_vars_default:		list of default build variables
# @_group_name:			build group name
# @_pkg_name:			single package name
# @_restart_at:			optional comma-separated list of build steps at which to rebuild or ALL or LAST
# @_workdir:			pathname to build-specific temporary directory
#
# Return:			zero (0) on success, non-zero (>0) on failure
#
ex_pkg_env() {
	local	_epe_build_steps_default="${1}" _epe_build_vars_default="${2}" _epe_group_name="${3}"	\
		_epe_pkg_name="${4}" _epe_restart_at="${5}" _epe_workdir="${6}"				\
		_epe_inherit_from="" _epe_vars_file="" _epe_vname="";

	if rtl_get_var_unsafe \$_epe_inherit_from -u "PKG_${_epe_pkg_name}_INHERIT_FROM"\
	&& [ "${_epe_inherit_from:+1}" = 1 ]; then
		rtl_get_var_unsafe \$_epe_vars_file -u "PKG_${_epe_inherit_from}_VARS_FILE";
	else
		rtl_get_var_unsafe \$_epe_vars_file -u "PKG_${_epe_pkg_name}_VARS_FILE";
	fi;
	if [ "${_epe_vars_file:+1}" != 1 ]; then
		_epe_vars_file="vars/${_epe_pkg_name}.vars";
	fi;

	rtl_fileop source_opt "${_epe_vars_file}" "${_epe_group_name}/${_epe_pkg_name}.${_epe_group_name}";
	if ! exp_pkg_env_set "${_epe_build_vars_default}" "${_epe_group_name}" "${_epe_pkg_name}"\
	|| ! exp_pkg_env_defaults "${_epe_build_steps_default}" "${_epe_pkg_name}" "${_epe_workdir}"; then
		return 1;
	fi;

	return 0;
};

#
# ex_pkg_state_set() - update build step status for single named package
# @_pkg_name:		single package name
# @_build_step:		build step set status of
# [@${@}]:		optional list of build steps to invalidate status of
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_pkg_state_set() {
	rtl_state_set "${BUILD_WORKDIR}" "${@}";
};


ex_pkg_state_set2() {
	local _epss2_workdir="${1}"; shift;
	rtl_state_set "${_epss2_workdir}" "${@}";
};

#
# ex_pkg_state_test() - test build step status of single named package
# @_pkg_name:		single package name
# @_build_step:		build step to test status of
# @_restart_at:		optional comma-separated list of build steps at which to rebuild or ALL or LAST
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_pkg_state_test() {
	rtl_state_test "${BUILD_WORKDIR}" "${@}";
};

ex_pkg_state_test2() {
	local _epst2_workdir="${1}"; shift;
	rtl_state_test "${_epst2_workdir}" "${@}";
};

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