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#
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# . ./build.vars and set -o errexit -o noglob are assumed.
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# See warning at the top of build.vars.
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#
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cpu_get_fnames() {
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	if test_cmd pkg_${cu_name}_check_updates; then
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		pkg_${cu_name}_check_updates get_fnames;
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	fi;
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	if [ -z "${cu_fnames}" ]; then
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		if [ "${cu_url#*://github.com/*}" != "${cu_url}" ]; then
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			_cpugf_uname="${cu_url#*/github.com/}";
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			_cpugf_uname="${_cpugf_uname%%/*}";
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			_cpugf_pname="${cu_url#*/github.com/${_cpugf_uname}/}";
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			_cpugf_pname="${_cpugf_pname%%/*}";
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			cu_url_index="https://github.com/${_cpugf_uname%%/*}/${_cpugf_pname%%/*}/releases/";
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			unset _cpu_uname _cpu_pname;
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			cu_fnames="$(wget ${WGET_ARGS} -qO- ${cu_url_index}	|\
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				sed -n '//s/^.*\([a-zA-Z]\+-\|v\|\)\(.\+\)<\/span>.*$/\3/p')";
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			cu_fname_base="${cu_name}";
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			cu_fname_ext="${cu_fname#v${cu_version}.}";
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		else
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			cu_url_index="${cu_url%/*}/";
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			cu_fnames="$(wget ${WGET_ARGS} -qO- "${cu_url_index}"	|\
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				sed -n '/[hH][rR][eE][fF]="[^"]\+"/s/^.*[hH][rR][eE][fF]="\([^"]\+\)".*$/\1/p')";
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		fi;
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	fi;
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	: ${cu_fname:="${cu_url##*/}"};
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	: ${cu_fname_base:="${cu_fname%%-*}"};
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	: ${cu_fname_ext:="${cu_fname#${cu_fname_base}-${cu_version}.}"};
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};
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cpu_get_version() {
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	unset cu_fname_version;
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	if test_cmd pkg_${cu_name}_check_updates; then
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		pkg_${cu_name}_check_updates get_version;
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	fi;
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	if [ -z "${cu_fname_version}" ]; then
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		if [ "${cu_url#*://github.com/*}" != "${cu_url}" ]; then
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			if [ "${cu_fname#${cu_fname_base}-}" = "${cu_fname}" ]\
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			&& [ "${cu_fname%.${cu_fname_ext}}" = "${cu_fname}" ]; then
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				cu_fname_version="${cu_fname}";
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			fi;
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		elif [ "${cu_fname#${cu_fname_base}-}" != "${cu_fname}" ]\
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		&& [ "${cu_fname%.${cu_fname_ext}}" != "${cu_fname}" ]; then
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			cu_fname_version="${cu_fname#${cu_fname_base}-}";
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			cu_fname_version="${cu_fname_version%.${cu_fname_ext}}";
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		fi;
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	fi;
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};
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check_pkg_updates() {
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	cu_name="${1}"; cu_version="${2}"; cu_url="${3}"; cu_url_type="${4}";
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	. vars/check_updates.vars;
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	if match_list "${CHECK_UPDATES_SKIP}" " " "${cu_name}"; then
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		log_msg vnfo "Skipping \`${cu_name}' (set in \${CHECK_UPDATES_SKIP}.)";
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		return 0;
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	elif [ "${cu_url_type}" = "git" ]; then
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		log_msg vnfo "Skipping \`${cu_name}' (URL_TYPE is Git.)";
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		return 0;
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	elif [ -z "${cu_version}" -o -z "${cu_url}" ]; then
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		log_msg fail "Zero-length \${cu_version} and/or \${cu_url} for \`${cu_name}' (ignored.)";
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		return 0;
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	else
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		log_msg vnfo "Checking ${cu_name} v${cu_version} for updates.";
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		cpu_get_fnames; _cpu_versions="";
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	fi;
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	for cu_fname in ${cu_fnames}; do
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		cu_fname="${cu_fname##*/}"; cpu_get_version;
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		if [ -z "${cu_fname_version}" ]; then
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			continue;
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		elif ! echo "${cu_fname_version}" | grep -Eq '^[-_.0-9a-zA-Z]+$'	\
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		||   echo "${cu_fname_version}" | grep -Eq '^[_.a-zA-Z]+'; then
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			log_msg varn "Skipping \`${cu_fname_version}' (invalid version.)";
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		else
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			_cpu_versions="${_cpu_versions:+${_cpu_versions} }${cu_fname_version}";
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		fi;
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	done;
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	if [ -z "${_cpu_versions}" ]; then
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		log_msg warn "No versions available for \`${cu_name}' (Filename URL: ${cu_url}, index URL: ${cu_url_index}).";
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	else
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		_cpu_versions="$(echo "${_cpu_versions}"	|\
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			sed 's/ /\n/g' | sort -rV | uniq	|\
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			head -n${CHECK_UPDATES_SHOW_NEW:-6}	|\
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			paste -d" " -s)";
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		if test_cmd pkg_${cu_name}_check_updates; then
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			pkg_${cu_name}_check_updates version_fixup;
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		fi;
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		if [ "${_cpu_versions%% *}" != "${cu_version}" ]; then
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			log_msg info "New release(s) available for ${cu_name} v${cu_version}: ${_cpu_versions}.";
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		else
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			log_msg vnfo "${cu_name} v${cu_version} is up to date.";
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		fi;
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	fi;
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	unset	cu_fname cu_fname_base cu_fname_ext cu_fnames cu_fname_version	\
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		cu_name cu_url cu_url_fname cu_url_fname_base cu_url_fname_ext	\
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		cu_url_index cu_url_type cu_version _cpu_versions;
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};
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# vim:filetype=sh