$ git clone -n https://src.fedoraproject.org/rpms/doxygen.git /var/lib/mock/f42-build-3274721-41317/root/chroot_tmpdir/scmroot/doxygen
Cloning into '/var/lib/mock/f42-build-3274721-41317/root/chroot_tmpdir/scmroot/doxygen'...
$ git fetch origin 44c8077568ff507ad48212f09e39c1fd7249ccc1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/doxygen
 * [new ref]         44c8077568ff507ad48212f09e39c1fd7249ccc1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44c8077 Use bundled spdlog on RHEL