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#
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# set +o errexit -o noglob is assumed.
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#
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rtl_check_path_vars() {
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	local _vnames="${1}" _rc=0 _vname="" _vname_val=""; _status="";
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	for _vname in ${_vnames}; do
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		_vname_val="$(rtl_get_var_unsafe "${_vname}")";
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		if [ -z "${_vname_val}" ]; then
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			_rc=1; _status="Error: variable \`${_vname}' is empty or unset."; break;
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		elif [ "${_vname_val#* *}" != "${_vname_val}" ]; then
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			_rc=2; _status="Error: variable \`${_vname}' contains one or more whitespace characters."; break;
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		fi;
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	done;
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	return "${_rc}";
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};
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rtl_clean_env() {
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	local _env_vars_except="${1}" _env_var="" _env_vars="";
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	_env_vars="$(export | sed -ne '/^export/{s/^export //;s/=.*$//p}')";
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	for _env_var in ${_env_vars}; do
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		if [ "${_env_var#DEFAULT_}" != "${_env_var}" ]\
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		|| [ "${_env_var#PKG_}" != "${_env_var}" ]; then
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			_env_vars_except="${_env_vars_except:+${_env_vars_except} }${_env_var}";
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		fi;
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	done;
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	rtl_unset_vars $(rtl_lfilter "${_env_vars}" "${_env_vars_except}");
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};
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rtl_exists_any() {
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	local _subdir="${1}"; shift;
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	while [ "${#}" -gt 0 ]; do
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		if [ -e "${_subdir}/${1}" ]; then
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			return 0;
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		else
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			shift;
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		fi;
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	done; return 1;
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};
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rtl_export_vars() {
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	local _unsetfl=0; [ "x${1}" = "x-u" ] && { _unsetfl=1; shift; };
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	while [ "${#}" -ge 2 ]; do
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		if [ -n "${2}" ]; then
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			if [ "${_unsetfl:-0}" -eq 0 ]; then
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				rtl_set_var_unsafe "${1}" "${2}"; export "${1}";
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			else
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				unset "${1}";
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			fi;
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		fi;
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		shift 2;
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	done;
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};
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rtl_get_var_unsafe() {
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	local _vname="";
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	if [ "x${1}" = "x-u" ]; then
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		shift; _vname="$(rtl_toupper "${1}")";
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	else
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		_vname="${1}";
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	fi;
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	eval echo \${${_vname}};
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};
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rtl_head() {
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	local _pattern="${1}" _s="${2}";
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	while true; do
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		if [ "${_s%%${_pattern}}" = "${_s}" ]; then
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			break;
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		else
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			_s="${_s%%${_pattern}}";
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		fi;
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	done;
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	echo "${_s}";
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};
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rtl_kill_tree() {
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	local _pid="${1}" _signal="TERM" _pid_child="" _pid_top="";
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	for _pid_top in $(pgrep -P "${_pid}"); do
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		for _pid_child in $(pgrep -P "${_pid_top}" 2>/dev/null); do
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			_pids_killed="${_pids_killed:+${_pids_killed} }${_pid_child}"; kill "-${_signal}" "${_pid_child}" 2>/dev/null;
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		done;
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		_pids_killed="${_pids_killed:+${_pids_killed} }${_pid_top}"; kill "-${_signal}" "${_pid_top}" 2>/dev/null;
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	done;
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};
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rtl_run_cmd_unsplit() {
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	local _cmd="${1}" _cmdline="" _rc="" IFS; shift;
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	while [ ${#} -gt 0 ]; do
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		[ -n "${1}" ] &&\
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			_cmdline="${_cmdline:+${_cmdline}:}${1}";
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		shift;
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	done;
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	IFS=:; ${_cmd} ${_cmdline}; _rc=$?;
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	return ${_rc};
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};
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rtl_set_vars() {
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	local	_vars_set_vname="${1}" _vname_dst="${2}" _vname_src_tmpls="${3}"	\
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		_vars_set_old="" _vars_set_tmp="" _vname_src="";
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	for _vname_src in $(rtl_toupper "${_vname_src_tmpls}"); do
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		_vname_src="${_vname_src}_${_vname_dst}";
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		_vval_src="$(rtl_get_var_unsafe "${_vname_src}")";
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		if [ -n "${_vval_src}" ]; then
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			rtl_set_var_unsafe "PKG_${_vname_dst}" "${_vval_src}";
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			_vars_set_tmp="${_vars_set_tmp:+${_vars_set_tmp} }PKG_${_vname_dst}";
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		fi;
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	done;
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	_vars_set_old="$(rtl_get_var_unsafe "${_vars_set_vname}")";
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	rtl_set_var_unsafe "${_vars_set_vname}"					\
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		"${_vars_set_old:+${_vars_set_old} }${_vars_set_tmp}";
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};
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# vim:filetype=sh