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

#
# exp_pkg_exec_pre() - XXX
# @_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
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_exec_pre() {
	local _group_name="${1}" _pkg_name="${2}" _restart_at="${3}";
	if [ -z "${PKG_URL}" ]\
	&& [ -z "${PKG_URLS_GIT}" ]\
	&& [ -z "${PKG_VERSION}" ]\
	&& ! ex_rtl_test_cmd "pkg_${_pkg_name}_all"; then
		"${_dispatch_fn}" exec_missing "${_group_name}" "${_pkg_name}";
		return 1;
	elif ! ex_pkg_state_test "${_pkg_name}" "start" "${_restart_at}"; then
		if [ "${PKG_NO_CLEAN_BASE_DIR:-0}" -eq 0 ]\
		&& ! ex_rtl_fileop rm "${PKG_BASE_DIR}" "${PKG_BUILD_DIR}" "${PKG_DESTDIR}"\
		|| ! ex_rtl_fileop mkdir "${PKG_BASE_DIR}"; then
			return "${?}";
		fi;
		if ! ex_rtl_fileop mkdir "${PKG_BUILD_DIR}" "${PKG_DESTDIR}"\
		|| ! ex_pkg_state_set "${_pkg_name}" "start"; then
			return "${?}";
		fi;
	fi;
	ex_rtl_fileop cd "${PKG_BUILD_DIR}";
};

#
# exp_pkg_exec_step() - XXX
# @_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
# @_step:		build step to execute
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_exec_step() {
	local	_group_name="${1}" _pkg_name="${2}" _restart_at="${3}" _step="${4}"	\
		_fn_name="" _pkg_step_fn="" _rc=0;
	if ex_rtl_test_cmd "pkg_${_pkg_name}_${_step}"; then
		_pkg_step_fn="pkg_${_pkg_name}_${_step}";
	else
		_pkg_step_fn="pkg_${_step}";
	fi;
	for _fn_name in \
			"pkg_${_pkg_name}_${_step}_pre"	\
			"${_pkg_step_fn}"		\
			"pkg_${_pkg_name}_${_step}_post"; do
		if ex_rtl_test_cmd "${_fn_name}"\
		&& ! "${_fn_name}" "${_group_name}" "${_pkg_name}" "${_restart_at}"; then
			_rc=1; break;
		fi;
	done;
	return "${_rc}";
};

#
# exp_pkg_exec() - XXX
# @_dispatch_fn:	top-level dispatch function name
# @_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
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_pkg_exec() {
	local	_dispatch_fn="${1}" _group_name="${2}" _pkg_name="${3}" _restart_at="${4}"	\
		_rc=0 _step="" _step_next="";
	trap "if [ \${?} -eq 0 ]; then								\
		echo \"done ${_group_name} ${_pkg_name}\" >&3;					\
	      else										\
		echo \"fail ${_group_name} ${_pkg_name}\" >&3;					\
		pkill -U "${$}";								\
	      fi;" EXIT HUP INT TERM USR1 USR2;
	if exp_pkg_exec_pre "${_group_name}" "${_pkg_name}" "${_restart_at}"\
	&& "${_dispatch_fn}" exec_start "${_group_name}" "${_pkg_name}"; then
		if ex_rtl_test_cmd "pkg_${_pkg_name}_all"; then
			"pkg_${_pkg_name}_all" "${_restart_at}";
		else	set -- ${PKG_BUILD_STEPS};
			while [ ${#} -gt 0 ]; do
				_step="${1}"; _step_next="${2}"; shift;
				if ex_pkg_state_test "${_pkg_name}" "${_step}" "${_restart_at}"; then
					continue;
				elif ! exp_pkg_exec_step "${_group_name}" "${_pkg_name}" "${_restart_at}" "${_step}"; then
					_rc=1; break;
				else
					echo "step ${_group_name} ${_pkg_name} ${_step}" >&3;
					"${_dispatch_fn}" exec_step "${_group_name}" "${_pkg_name}" "${_step}";
					ex_pkg_state_set "${_pkg_name}" "${_step}" "${_step_next:+-${_step_next}}";
				fi;
			done;
		fi;
		"${_dispatch_fn}" exec_finish "${_group_name}" "${_pkg_name}";
		ex_pkg_state_set "${_pkg_name}" finish;
	fi;
	return "${_rc}";
};

# vim:filetype=sh