$ git clone -n https://src.fedoraproject.org/rpms/rust-serial_test2.git /var/lib/mock/f45-build-44875-818/root/chroot_tmpdir/scmroot/rust-serial_test2
Cloning into '/var/lib/mock/f45-build-44875-818/root/chroot_tmpdir/scmroot/rust-serial_test2'...
$ git fetch origin 13789eb38df5464bee9958a01f4beea71114cbc8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serial_test2
 * [new ref]         13789eb38df5464bee9958a01f4beea71114cbc8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13789eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild