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#
# set +o errexit -o noglob -o nounset 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 or LAST
# @_workdir:		pathname to build-specific temporary directory
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_exec_pre() {
	local _eppep_group_name="${1}" _eppep_pkg_name="${2}" _eppep_restart_at="${3}" _eppep_workdir="${4}";

	if [ "${PKG_URL:+1}" != 1 ]\
	&& [ "${PKG_URLS_GIT:+1}" != 1 ]\
	&& [ "${PKG_VERSION:+1}" != 1 ]\
	&& [ "${PKG_INSTALL_FILES:+1}" != 1 ]\
	&& [ "${PKG_INSTALL_FILES_V2:+1}" != 1 ]\
	&& ! rtl_test_cmd "pkg_${_eppep_pkg_name}_all";
	then
		"${_eppep_dispatch_fn}" missing_pkg "${_eppep_group_name}" "${_eppep_pkg_name}";
		return 1;
	elif ! ex_pkg_state_test2			\
			"${_eppep_workdir}"		\
			"${_eppep_pkg_name}" "start"	\
			"${_eppep_restart_at}";
	then
		if [ "${PKG_NO_CLEAN_BASE_DIR:-0}" -eq 0 ]\
		&& ! rtl_fileop rm "${PKG_BASE_DIR}" "${PKG_BUILD_DIR}" "${PKG_DESTDIR}" "${PKG_DESTDIR_HOST}"\
		|| ! rtl_fileop mkdir "${PKG_BASE_DIR}";
		then
			return 1;
		fi;

		if ! rtl_fileop mkdir "${PKG_BUILD_DIR}" "${PKG_DESTDIR}"\
		|| ! ex_pkg_state_set2 "${_eppep_workdir}" "${_eppep_pkg_name}" "start";
		then
			return 1;
		fi;
	elif ! rtl_exists_any "${PKG_BASE_DIR}" "${PKG_BUILD_DIR}" "${PKG_DESTDIR}" "${PKG_DESTDIR_HOST}"\
	&&   ! rtl_fileop mkdir "${PKG_BASE_DIR}" "${PKG_BUILD_DIR}" "${PKG_DESTDIR}" "${PKG_DESTDIR_HOST}";
	then
		return 1
	fi;

	rtl_fileop cd "${PKG_BUILD_DIR}";
	return "${?}";
};

#
# 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 or LAST
# @_step:		build step to execute
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_exec_step() {
	local	_eppes_group_name="${1}" _eppes_pkg_name="${2}" _eppes_restart_at="${3}"	\
		_eppes_step="${4}"								\
		_eppes_fn_name="" _eppes_pkg_step_fn="" _eppes_rc=0;

	if rtl_test_cmd "pkg_${_eppes_pkg_name}_${_eppes_step}"; then
		_eppes_pkg_step_fn="pkg_${_eppes_pkg_name}_${_eppes_step}";
	else
		_eppes_pkg_step_fn="pkg_${_eppes_step}";
	fi;

	for _eppes_fn_name in 						\
			"pkg_${_eppes_pkg_name}_${_eppes_step}_pre"	\
			"${_eppes_pkg_step_fn}"				\
			"pkg_${_eppes_pkg_name}_${_eppes_step}_post";
	do
		if rtl_test_cmd "${_eppes_fn_name}"\
		&& ! "${_eppes_fn_name}"					\
				"${_eppes_group_name}" "${_eppes_pkg_name}"	\
				"${_eppes_restart_at}";
		then
			_eppes_rc=1; break;
		fi;
	done;

	return "${_eppes_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 or LAST
# @_workdir:		pathname to build-specific temporary directory
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_exec() {
	local	_eppe_dispatch_fn="${1}" _eppe_group_name="${2}" _eppe_pkg_name="${3}"	\
		_eppe_restart_at="${4}" _eppe_workdir="${5}"				\
		_eppe_build_step_last="" _eppe_rc=0 _eppe_step="";

	if ! exp_pkg_exec_pre						\
			"${_eppe_group_name}" "${_eppe_pkg_name}"	\
			"${_eppe_restart_at}" "${_eppe_workdir}"\
	|| ! "${_eppe_dispatch_fn}"				\
			start_pkg_child "${_eppe_group_name}"	\
			"${_eppe_pkg_name}";
	then
		_eppe_rc=1;
	elif rtl_test_cmd "pkg_${_eppe_pkg_name}_all"; then
		"pkg_${_eppe_pkg_name}_all"				\
			"${_eppe_group_name}" "${_eppe_pkg_name}"	\
			"${_eppe_restart_at}";
		_eppe_rc="${?}";
	else
		set -- ${PKG_BUILD_STEPS};
		while [ ${#} -gt 0 ]; do
			_eppe_step="${1}"; shift;

			if [ "${#_eppe_restart_at}" -gt 0 ]\
			&& [ "${_eppe_restart_at}" != "ALL" ]\
			&& [ "${_eppe_restart_at}" != "LAST" ]\
			&& ! rtl_lmatch \$_eppe_restart_at "${_eppe_step}" ","; then
				continue;
			fi;

			if [ "${_eppe_step}" = "finish" ]; then
				ex_pkg_state_set2 "${_eppe_workdir}" "${_eppe_pkg_name}" finish; break;
			elif [ "${PKG_FORCE:-0}" -eq 0 ]\
			&&   ex_pkg_state_test2 "${_eppe_workdir}" "${_eppe_pkg_name}" "${_eppe_step}" "${_eppe_restart_at}";
			then
				continue;
			elif ! exp_pkg_exec_step					\
					"${_eppe_group_name}" "${_eppe_pkg_name}"	\
					"${_eppe_restart_at}" "${_eppe_step}";
			then
				_eppe_rc=1; break;
			else	printf "step %s %s %s\n" "${_eppe_group_name}" "${_eppe_pkg_name}" "${_eppe_step}" >&3;
				ex_pkg_state_set2 "${_eppe_workdir}" "${_eppe_pkg_name}" "${_eppe_step}" "${@}";
			fi;
		done;
	fi;

	return "${_eppe_rc}";
};

#
# ex_pkg_exec() - dispatch single named packages
# @_rdispatch_count:		reference to inout variable of dispatcher count
# @_dispatch_count_cur:		current dispatcher count
# @_dispatch_count_max:		maximum dispatcher count
# @_dispatch_group_cur:		current group
# @_dispatch_group_max:		maximum group
# @_rdispatch_njobs:		reference to inout variable of dispatcher count
# @_rdispatch_wait:		reference to inout variable of package names in a wait state
# @_build_steps_default:	list of default build steps
# @_build_vars_default:		list of default build variables
# @_dispatch_fn:		top-level dispatch function name
# @_group_name:			build group name
# @_pipe_path:			pathname to parent-child process FIFO
# @_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_exec() {
	local	_epdp_rdispatch_count="${1#\$}" _epdp_dispatch_count_cur="${2}" _epdp_dispatch_count_max="${3}"		\
		_epdp_dispatch_group_cur="${4}" _epdp_dispatch_group_max="${5}" _epdp_rdispatch_njobs="${6#\$}"		\
		_epdp_rdispatch_wait="${7#\$}" _epdp_build_steps_default="${8}" _epdp_build_vars_default="${9}"		\
		_epdp_dispatch_fn="${10}" _epdp_group_name="${11}" _epdp_pipe_path="${12}" _epdp_pkg_name="${13}"	\
		_epdp_restart_at="${14}" _epdp_workdir="${15}"								\
		_epdp_dispatch_count_new=0 _epdp_perc_group=0 _epdp_perc_pkg=0;

	rtl_percentage2 \$_epdp_dispatch_group_cur \$_epdp_dispatch_group_max \$_epdp_perc_group;
	rtl_percentage2 \$_epdp_dispatch_count_cur \$_epdp_dispatch_count_max \$_epdp_perc_pkg;

	eval _epdp_dispatch_count_new='$((${'"${_epdp_rdispatch_count}"'}+1))';
	if "${_epdp_dispatch_fn}"				\
			start_pkg "${_epdp_group_name}"		\
			"${_epdp_pkg_name}"			\
			"${_epdp_dispatch_count_new}"		\
			"${_epdp_dispatch_count_max}"		\
			"${_epdp_perc_group}" "${_epdp_perc_pkg}";
	then
		eval : '$(('${_epdp_rdispatch_njobs}'+=1))';
		eval ${_epdp_rdispatch_count}=\"\${_epdp_dispatch_count_new}\";
		rtl_lconcat "${_epdp_rdispatch_wait}" "${_epdp_pkg_name}";

		(trap "if [ \${?} -eq 0 ]; then												\
			printf \"done %s %s %d\n\" \"${_epdp_group_name}\" \"${_epdp_pkg_name}\" \"${_epdp_dispatch_count_new}\" >&3;	\
		      else														\
			printf \"fail %s %s %d\n\" \"${_epdp_group_name}\" \"${_epdp_pkg_name}\" \"${_epdp_dispatch_count_new}\" >&3;	\
			pkill -U "${$}";												\
		      fi;" EXIT HUP INT TERM USR1 USR2;
		set +o errexit -o noglob -o nounset; BUILD_IS_PARENT=0; rtl_log_set_fname ""; rtl_log_set_no_attr 1;

		if ex_pkg_env									\
				"${_epdp_build_steps_default}" "${_epdp_build_vars_default}"	\
				"${_epdp_group_name}" "${_epdp_pkg_name}"			\
				"${_epdp_restart_at}" "${_epdp_workdir}";
		then
			exp_pkg_exec						\
				"${_epdp_dispatch_fn}" "${_epdp_group_name}"	\
				"${_epdp_pkg_name}" "${_epdp_restart_at}"	\
				"${_epdp_workdir}";
		else
			return 1;
		fi;) 1>"${_epdp_workdir}/${_epdp_pkg_name}_stderrout.log" 2>&1 3>"${_epdp_pipe_path}" &
		return "${?}";
	else
		return 1;
	fi;
};

# vim:filetype=sh