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#
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# set +o errexit -o noglob -o nounset is assumed.
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#
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pkgtoolp_init_args() {
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	local _rc=0; _status="";
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	if [ "$((${ARG_INFO:-0} + ${ARG_RDEPENDS:-0} + ${ARG_SHELL:-0} + ${ARG_TARBALL:-0}))" -gt 1 ]; then
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		cat etc/pkgtool.usage; _rc=1; _status="Error: only one of -i, -r, -s, or -t must be specified.";
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	elif [ "$((${ARG_INFO:-0} + ${ARG_RDEPENDS:-0} + ${ARG_SHELL:-0} + ${ARG_TARBALL:-0}))" -eq 0 ]\
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	&&   [ -z "${ARG_RESTART_AT}" ]\
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	&&   [ "${ARG_UPDATE_DIFF:-0}" -eq 0 ]; then
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		cat etc/pkgtool.usage; _rc=1; _status="Error: one of -i, -r, -s, or -t must be specified.";
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	else	_rc=0;
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	fi; return "${_rc}";
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};
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pkgtoolp_init_env() {
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	local _fname="" _rc=0; _status="";
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	if ! cd "${0%/*}"; then
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		printf "Error: failed to change working directory to \`${0%/*}'." >&2; exit 1;
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	elif ! umask 022; then
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		printf "Error: failed to set umask(2).\n" >&2; exit 1;
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	else	for _fname in $(find subr -name *.subr); do
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			if ! . "${_fname}"; then
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				printf "Error: failed to source \`%s'.\n" "${_fname}" >&2; exit 1;
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			fi;
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		done;
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	fi; return "${_rc}";
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};
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pkgtoolp_init_getopts() {
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	local _opt="" _shiftfl=0 _rc=0 OPTIND=0; _status=""; : ${ARCH:="nt64"}; : ${BUILD:="debug"};
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	ARG_INFO=0; ARG_RESTART_AT=""; ARG_RDEPENDS=0; ARG_UPDATE_DIFF=0; ARG_SHELL=0; ARG_TARBALL=0;
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	while [ "${#}" -gt 0 ]; do
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		case "${1}" in
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		--update-diff)
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			ARG_UPDATE_DIFF=1; _shiftfl=1; ;;
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		--restart-at)
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			if [ "${#}" -lt 2 ]\
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			|| [ -z "${2}" ]; then
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				_rc=1; _status="Error: missing argument for option --restart-at.";
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			else
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				ARG_RESTART_AT="${2}"; _shiftfl=2;
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			fi; ;;
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		*)	_shiftfl=0; ;;
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		esac;
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		if [ "${_rc:-0}" -ne 0 ]; then
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			break;
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		elif [ "${_shiftfl:-0}" -gt 0 ]; then
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			shift "${_shiftfl}"; continue;
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		elif getopts a:b:hirst _opt; then
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			case "${_opt}" in
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			a)	ARCH="${OPTARG}"; ;;
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			b)	BUILD="${OPTARG}"; ;;
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			h)	cat etc/pkgtool.usage; exit 0; ;;
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			i)	ARG_INFO=1; ;;
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			r)	ARG_RDEPENDS=1; ;;
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			s)	ARG_SHELL=1; ;;
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			t)	ARG_TARBALL=1; ;;
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			*)	cat etc/pkgtool.usage; exit 1; ;;
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			esac; shift $((${OPTIND}-1)); OPTIND=1;
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		else
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			break;
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		fi;
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	done;
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	if [ "${_rc}" -eq 0 ]; then
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		while [ "${#}" -gt 0 ]; do
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			case "${1}" in
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			*=*)	rtl_set_var_unsafe "${1%%=*}" "${1#*=}"; ;;
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			*)	if [ "${#}" -ne 1 ]; then
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					_rc=1; _status="Error: invalid argument \`${1}'.";
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				fi; break; ;;
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			esac; shift;
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		done;
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		if [ "${_rc:-0}" -eq 0 ]; then
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			if [ "${#}" -ne 1 ]\
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			&& [ -z "${PKGTOOL_PKG_NAME:-}" ]; then
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				_rc=1; _status="Error: missing package name.";
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			elif [ "${#}" -eq 1 ]; then
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				PKGTOOL_PKG_NAME="${1}"; export PKGTOOL_PKG_NAME;
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			fi;
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		fi;
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	fi; return "${_rc}";
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};
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pkgtoolp_init_getopts_help() {
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	local _opt="";
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	while getopts a:b:hirst _opt 2>/dev/null; do
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	case "${_opt}" in
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	h)	cat etc/build.usage; exit 0; ;;
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	esac; done; shift $((${OPTIND}-1));
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};
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pkgtoolp_init_prereqs() {
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	if ! rtl_check_prereqs \
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			awk bzip2 cat chmod cp date find grep hostname mkdir	\
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			mktemp mv paste printf readlink rm sed sort tar test	\
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			touch tr uniq; then
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		printf "%s\n" "${_status}" >&2; exit 1;
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	elif ! (FNAME="$(mktemp)" && { trap "rm -f \"\${FNAME}\"" EXIT;		\
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			sed -i'' -e '' "${FNAME}" >/dev/null 2>&1; }); then
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		printf "Error: sed(1) in \${PATH} does not support the \`-i' option.\n" >&2; exit 1;
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	fi;
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};
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pkgtool_init() {
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	local _fname="" _rc=0; _status="";
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	if ! pkgtoolp_init_env			\
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	|| ! pkgtoolp_init_getopts_help "${@}"	\
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	|| ! pkgtoolp_init_prereqs		\
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	|| ! pkgtoolp_init_getopts "${@}"	\
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	|| ! ex_pkg_load_vars			\
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	|| ! pkgtoolp_init_args; then
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		_rc=1; _status="${_status}";
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	fi; return "${_rc}";
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};
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# vim:filetype=sh