$ git clone -n https://src.fedoraproject.org/rpms/sayonara.git /var/lib/mock/f39-build-2303204-56870/root/chroot_tmpdir/scmroot/sayonara
Cloning into '/var/lib/mock/f39-build-2303204-56870/root/chroot_tmpdir/scmroot/sayonara'...
$ git fetch origin ae8263f513fc35bf02d3c4a1aab62889ef6e367b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sayonara
 * [new ref]         ae8263f513fc35bf02d3c4a1aab62889ef6e367b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae8263f Update to 1.9.0 beta1