$ git clone -n https://src.fedoraproject.org/rpms/VirtualGL.git /var/lib/mock/f38-build-side-42-init-devel-613125-26293/root/chroot_tmpdir/scmroot/VirtualGL
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-613125-26293/root/chroot_tmpdir/scmroot/VirtualGL'...
$ git fetch origin b9b95139f8b9b78edebb6c75081e2ba6c418f426:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/VirtualGL
 * [new ref]         b9b95139f8b9b78edebb6c75081e2ba6c418f426 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9b9513 Fix FTBFS by removing the dot on cmake