$ git clone -n https://src.fedoraproject.org/rpms/xvinfo.git /var/lib/mock/f45-build-39160-732/root/chroot_tmpdir/scmroot/xvinfo
Cloning into '/var/lib/mock/f45-build-39160-732/root/chroot_tmpdir/scmroot/xvinfo'...
$ git fetch origin 4102bdd36ecc52c49233f7eb1d0d7b5f8d42f429:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xvinfo
 * [new ref]         4102bdd36ecc52c49233f7eb1d0d7b5f8d42f429 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4102bdd opt-in to packit for rawhide