$ git clone -n https://src.fedoraproject.org/rpms/htmlcxx.git /var/lib/mock/f40-build-2199289-51730/root/chroot_tmpdir/scmroot/htmlcxx
Cloning into '/var/lib/mock/f40-build-2199289-51730/root/chroot_tmpdir/scmroot/htmlcxx'...
$ git fetch origin 8b6718f47dfad53c06dd6209be1cb4a294195733:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/htmlcxx
 * [new ref]         8b6718f47dfad53c06dd6209be1cb4a294195733 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b6718f Set build_type_safety_c to 0 (#2168170)