$ git clone -n https://src.fedoraproject.org/rpms/vagrant-registration.git /var/lib/mock/f45-build-37888-718/root/chroot_tmpdir/scmroot/vagrant-registration
Cloning into '/var/lib/mock/f45-build-37888-718/root/chroot_tmpdir/scmroot/vagrant-registration'...
$ git fetch origin 203304f7b22256a420c68ad60fcaca5f335053d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vagrant-registration
 * [new ref]         203304f7b22256a420c68ad60fcaca5f335053d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 203304f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild