$ git clone -n https://src.fedoraproject.org/rpms/nebula.git /var/lib/mock/f45-build-20413-570/root/chroot_tmpdir/scmroot/nebula
Cloning into '/var/lib/mock/f45-build-20413-570/root/chroot_tmpdir/scmroot/nebula'...
$ git fetch origin 2ab21fd5d9137913fa1be473738a5ca69705d441:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nebula
 * [new ref]         2ab21fd5d9137913fa1be473738a5ca69705d441 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ab21fd Update to 1.11.1