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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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# N.B.	URLs ($1) may contain `?' or '&' characters.
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pkgp_fetch() {
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	_f_url="${1}"; _f_sha256sum_src="${2}";
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	if [ -z "${3}" ]; then
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		_f_url_dst="${DLCACHEDIR}/$(basename "${_f_url}")";
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	else
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		_f_url_dst="${DLCACHEDIR}/${3}";
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	fi;
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	if [ ${ARG_OFFLINE:-0} -eq 1 ]\
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	|| [ -e ${_f_url_dst}.fetched ]; then
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		unset _f_url _f_sha256sum_src _f_url_dst;
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		return 0;
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	else
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		wget ${WGET_ARGS} -c -O ${_f_url_dst} "${_f_url}";
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	fi;
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	if [ -n "${_f_sha256sum_src}" ]; then
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		set -- $(openssl dgst -sha256 ${_f_url_dst}); shift $((${#}-1));
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		if [ "${_f_sha256sum_dst:=${1}}" != "${_f_sha256sum_src}" ]; then
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			if [ ${ARG_IGNORE_SHA256SUMS:-0} -eq 0 ]; then
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				log_msg failexit "Error: hash mismatch for URL \`${_f_url}' (is: ${_f_sha256sum_dst}, should be: ${_f_sha256sum_src}.)";
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			else
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				log_msg warn "Warning: hash mismatch for URL \`${_f_url}' (is: ${_f_sha256sum_dst}, should be: ${_f_sha256sum_src}.)";
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			fi;
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		fi;
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	fi;
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	touch ${_f_url_dst}.fetched;
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	unset _f_url _f_url_dst _f_sha256sum_src _f_sha256sum_dst;
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};
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pkgp_fetch_git() {
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	_fg_subdir="${1}"; _fg_url="${2}"; _fg_branch="${3}";
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	if [ ${ARG_OFFLINE:-0} -eq 0 ]; then
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		if [ -e "${DLCACHEDIR}/${_fg_subdir}" ]; then
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			build_fileop cd ${DLCACHEDIR}/${_fg_subdir} &&\
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				git pull origin ${_fg_branch:-main} &&\
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					build_fileop cd ${OLDPWD};
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		else
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			git clone ${_fg_url} ${DLCACHEDIR}/${_fg_subdir};
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			if [ -n "${_fg_branch}" -a		\
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			     \( -z "${_fg_branch#main}" \) -a	\
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			     \( -z "${_fg_branch#master}" \) ]; then
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				build_fileop cd ${DLCACHEDIR}/${_fg_subdir}	&&\
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					git checkout -b ${_fg_branch}		&&\	
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						build_fileop cd ${OLDPWD};
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			fi;
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		fi;
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	fi;
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	build_fileop rm ${_fg_subdir};
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	build_fileop cp ${DLCACHEDIR}/${_fg_subdir} .;
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};
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pkgp_fetch_urls_git() {
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	for _ppfu_url_spec in "${@}"; do
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		_ppfu_subdir=${_ppfu_url_spec%=*};
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		_ppfu_url=${_ppfu_url_spec#*=};
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		_ppfu_url=${_ppfu_url%@*};
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		if [ "${_ppfu_url_spec#*@}" != "${_ppfu_url_spec}" ]; then
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			_ppfu_git_branch=${_ppfu_url_spec#*@};
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		fi;
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		pkgp_fetch_git ${_ppfu_subdir} ${_ppfu_url} ${_ppfu_git_branch};
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	done;
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	unset _ppfu_url_spec _ppfu_subdir _ppfu_url _ppfu_git_branch;
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};
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pkg_fetch() {
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	if [ -n "${1}" ]; then
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		if [ "${1}" = "-git" ]; then
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			shift; pkgp_fetch_urls_git ${1};
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		else
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			pkgp_fetch ${1} ${2};
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		fi;
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	else
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		if [ -n "${PKG_URL}" ]; then
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			pkgp_fetch ${PKG_URL} ${PKG_SHA256SUM} ${PKG_FNAME};
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		fi;
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		if [ -n "${PKG_URLS_GIT}" ]; then
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			pkgp_fetch_urls_git ${PKG_URLS_GIT};
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		fi;
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		set_build_script_done fetch -extract;
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	fi;
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};
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# vim:filetype=sh