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#
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# set +o errexit -o noglob is assumed.
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#
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#
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# ex_pkg_check_depends() - check single named package for unsatisfied dependencies
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# @_pkg_complete:	list of completed packages
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# @_pkg_name:		single package name
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# @_pkg_wait:		list of in-progress packages
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# @_restart_recursive:	optional flag specifiying either no dependency expansion (0,) dependency expansion (1,) dependency expansion and forcibly rebuild (2.)
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#
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# Return:		zero (0) given no outstanding dependencies, non-zero (>0) otherwise
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#
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ex_pkg_check_depends() {
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	local	_pkg_complete="${1}" _pkg_name="${2}" _pkg_wait="${3}" _restart_recursive="${4}"	\
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		_pkg_depends="" _pkg_name_depend="" _dependfl=0;
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	if _pkg_depends="$(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' $(rtl_get_var_unsafe -u "PKG_"${_pkg_name}"_DEPENDS"))"\
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	&& [ -n "${_pkg_depends}" ]\
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	&& ! [ -n "${_restart}" ] || [ "${_restart_recursive:-0}" -ge 1 ]; then
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		for _pkg_name_depend in $(rtl_uniq ${_pkg_depends}); do
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			if ! rtl_lmatch "${_pkg_complete}" "${_pkg_name_depend}"\
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			|| rtl_lmatch "${_pkg_wait}" "${_pkg_name_depend}"; then
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				_dependfl=1; break;
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			fi;
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		done;
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	fi;
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	return "${_dependfl}";
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};
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#
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# ex_pkg_expand_packages() - expand build group name to list of packages ordered and filtered according to dependency and restart constraints
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# @_group_name:		build group name
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# @_restart:		optional whitespace-separated list of package names to rebuild
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# @_restart_recursive:	optional flag specifiying either no dependency expansion (0,) dependency expansion (1,) dependency expansion and forcibly rebuild (2.)
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#
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# Return:		zero (0) on success, non-zero (>0) on failure, ${EXP_PKG_COMPLETE}, ${EXP_PKG_DISABLED}, ${EXP_PKG_FINISHED}, and ${EXP_PKG_NAMES} set post-return.
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#
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ex_pkg_expand_packages() {
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	local	_group_name="${1}" _restart="${2}" _restart_recursive="${3}"	\
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		_pkg_name="" _pkg_names="" _restart_check=0;
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	EXP_PKG_COMPLETE=""; EXP_PKG_DISABLED=""; EXP_PKG_FINISHED=""; EXP_PKG_NAMES="";
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	if _pkg_names="$(rtl_get_var_unsafe -u "${_group_name}_PACKAGES")"\
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	&& [ -n "${_pkg_names}" ]; then
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		if [ -n "${_restart}" ] && ! rtl_lmatch "${_restart}" "ALL LAST"; then
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			_pkg_names="$(rtl_lsearch "${_pkg_names}" "${_restart}")";
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		fi;
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		if ! [ -n "${_restart}" ] || [ "${_restart_recursive:-0}" -ge 1 ]; then
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			_pkg_names="$(rtl_uniq $(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' ${_pkg_names}))";
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		fi;
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		for _pkg_name in ${_pkg_names}; do
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			if [ "${_restart}" = "ALL" ]\
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			|| rtl_lmatch "${_restart}" "${_pkg_name}"; then
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				_restart_check=1;
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			else
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				_restart_check=0;
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			fi;
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			if [ -n "$(rtl_get_var_unsafe -u "PKG_${_pkg_name}_DISABLED")" ]; then
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				EXP_PKG_COMPLETE="$(rtl_lconcat "${EXP_PKG_COMPLETE}" "${_pkg_name}")";
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				EXP_PKG_DISABLED="$(rtl_lconcat "${EXP_PKG_DISABLED}" "${_pkg_name}")";
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				_pkg_names="$(rtl_lfilter "${_pkg_names}" "${_pkg_name}")";
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			elif ex_pkg_state_test "${_pkg_name}" finish\
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			&& [ "${_restart_check:-0}" -eq 0 ]\
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			&& [ "${_restart_recursive:-0}" -ne 2 ]\
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			&& [ "x$(rtl_get_var_unsafe -u "${_group_name}_FORCE")" != "x1" ]; then
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				EXP_PKG_COMPLETE="$(rtl_lconcat "${EXP_PKG_COMPLETE}" "${_pkg_name}")";
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				EXP_PKG_FINISHED="$(rtl_lconcat "${EXP_PKG_FINISHED}" "${_pkg_name}")";
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				_pkg_names="$(rtl_lfilter "${_pkg_names}" "${_pkg_name}")";
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			fi;
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		done;
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		EXP_PKG_NAMES="${_pkg_names}";
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	fi;
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	return 0;
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};
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