fi
_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]' &&
_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40" &&
- head=$(curl -ns $curl_extra_args "$merge_repo/$merge_head") &&
+ head=$(curl -nsf $curl_extra_args "$merge_repo/$merge_head") &&
expr "$head" : "$_x40\$" >/dev/null || {
echo >&2 "Failed to fetch $merge_head from $merge_repo"
exit 1