$ git clone -n https://src.fedoraproject.org/rpms/cpu-x.git /var/lib/mock/f39-build-2566427-62096/root/chroot_tmpdir/scmroot/cpu-x
Cloning into '/var/lib/mock/f39-build-2566427-62096/root/chroot_tmpdir/scmroot/cpu-x'...
$ git fetch origin 85fb7617ab066b6c30269e39e5fab6747f40ca5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cpu-x
 * [new ref]         85fb7617ab066b6c30269e39e5fab6747f40ca5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85fb761 [packit] 5.0.3 upstream release