#
# set +o errexit -o noglob -o nounset is assumed.
#

rtlp_fetch_url_git() {
	local	_cache_dname="${1}" _git_args="${2}" _git_branch="${3}" _mirrors="${4}"		\
		_pkg_name="${5}" _subdir="${6}" _tgtdir="${7}" _url="${8}" _cache_dname_full=""	\
		_clonefl=0 _git_pull_log_fname="" _oldpwd="" _url_base="";

	_cache_dname_full="${_cache_dname}/${_subdir##*/}";
	(set -o errexit -o noglob -o nounset;
	rtl_flock_acquire 4 || exit "${?}";
	trap "rm -f \"${_cache_dname_full%%[/]}.fetching\"" EXIT;
	if [ -e "${_cache_dname_full}" ]; then
		(rtl_fileop cd "${_cache_dname_full}" || exit 1;
		 _git_pull_log_fname="$(mktemp)" || exit 1;
		 trap 'rm -f "${_git_pull_log_fname}" 2>/dev/null' EXIT HUP INT TERM USR1 USR2;
		 if ! git pull ${_git_args} origin "${_git_branch:-main}" >"${_git_pull_log_fname}" 2>&1; then
			if grep -q '^fatal: refusing to merge unrelated histories$' "${_git_pull_log_fname}"; then
				cat "${_git_pull_log_fname}"; printf "Detected forced push(es).\n";
			elif grep -q '^Automatic merge failed; fix conflicts and then commit the result.$' "${_git_pull_log_fname}"; then
				cat "${_git_pull_log_fname}"; printf "Detected forced push(es).\n"; git merge --abort;
			else
				cat "${_git_pull_log_fname}"; exit 1;
			fi;
			while true; do
				printf "Attempting git-reset(1) --hard HEAD^ and git-pull(1)...\n";
				if ! git reset --hard "HEAD^"; then
					exit 1;
				elif git pull ${_git_args} origin "${_git_branch:-main}"; then
					exit 0;
				fi;
			done;
		 else
			cat "${_git_pull_log_fname}"; exit 0;
		 fi;) || return 1;
		(rtl_fileop cd "${_cache_dname_full}" &&\
			git submodule update) || return 1;
	else	if git clone ${_git_args} -b "${_git_branch:-main}" "${_url}" "${_cache_dname_full}"; then
			_clonefl=1;
		elif [ "${_mirrors}" = "skip" ]; then
			return 1;
		else	for _url_base in ${_mirrors}; do
				if git clone ${_git_args} -b "${_git_branch:-main}" "${_url_base}/${_pkg_name}/${_subdir}" "${_cache_dname_full}"; then
					_clonefl=1; break;
				fi;
			done;
		fi;
		if [ "${_clonefl}" -eq 0 ]; then
			return 1;
		else	if [ -n "${_git_branch}" ]; then
				(rtl_fileop cd "${_cache_dname_full}" &&\
					git checkout "${_git_branch}") || return 1;
			fi;
			(rtl_fileop cd "${_cache_dname_full}" &&\
				git submodule update --init) || return 1;
		fi;
	fi;
	if [ "${_cache_dname}" != "${_tgtdir}" ]; then
		_oldpwd="${PWD}"; rtl_fileop cd "${_tgtdir}" || return 1;
		rtl_fileop rm "${_tgtdir}/${_subdir}" || return 1;
		if [ ! -e "$(rtl_dirname "${_tgtdir}/${_subdir}")" ]; then
			rtl_fileop mkdir "$(rtl_dirname "${_tgtdir}/${_subdir}")";
		fi;
		rtl_fileop cp "${_cache_dname_full}" "${_tgtdir}/${_subdir}" || return 1;
		rtl_fileop cd "${_oldpwd}" || return 1;
	fi) 4<>"${_cache_dname_full%%[/]}.fetching";

	if [ "${?}" -eq 0 ]; then
		cd "$(pwd)";
	else
		return 1;
	fi;
};

rtl_fetch_mirror_urls_git() {
	local _git_args="${1}" _tgtdir="${2}" _rc=0 _repo_dname="" _subdir="" _url="" _url_spec=""; shift 2;

	for _url_spec in "${@}"; do
		_subdir="${_url_spec%=*}"; _subdir="${_subdir##*/}"; _url="${_url_spec#*=}"; _url="${_url%@*}";
		_repo_dname="${_subdir}"; [ "${_repo_dname%.git}" = "${_repo_dname}" ] && _repo_dname="${_repo_dname}.git";

		if [ ! -e "$(rtl_dirname "${_tgtdir}")" ]; then
			rtl_fileop mkdir "$(rtl_dirname "${_tgtdir}")";
		fi;
		(set -o errexit -o noglob -o nounset;
		rtl_flock_acquire 4 || exit "${?}";
		trap "rm -f \"${_tgtdir}/.fetching\"" EXIT;
		if [ -e "${_tgtdir}/${_repo_dname}" ]; then
			(rtl_fileop cd "${_tgtdir}/${_repo_dname}" && git fetch ${_git_args} --all) || return 1;
		else	(rtl_fileop cd "${_tgtdir}" && git clone ${_git_args} --mirror "${_url}" "${_repo_dname}") || return 1;
		fi) 4<>"${_tgtdir}/.fetching";
		if [ "${?}" -ne 0 ]; then
			_rc=1;
		fi;
	done; return "${_rc}";
};

rtl_fetch_urls_git() {
	local	_cache_dname="${1}" _git_args="${2}" _tgtdir="${3}" _pkg_name="${4}" _mirrors="${5}"\
		_git_branch="" _subdir="" _url="" _url_spec=""; shift 5;

	for _url_spec in "${@}"; do
		_subdir="${_url_spec%=*}"; _url="${_url_spec#*=}"; _url="${_url%@*}";
		if [ "${_url_spec#*@}" != "${_url_spec}" ]; then
			_git_branch=${_url_spec#*@};
		fi;
		if ! rtlp_fetch_url_git	\
				"${_cache_dname}" "${_git_args}" "${_git_branch}" "${_mirrors}"\
				"${_pkg_name}" "${_subdir}" "${_tgtdir}" "${_url}"; then
			return 1;
		fi;
	done;
};

# vim:filetype=sh