$ git clone -n https://src.fedoraproject.org/rpms/ceres-solver.git /var/lib/mock/f40-build-759522-120571/root/chroot_tmpdir/scmroot/ceres-solver
Cloning into '/var/lib/mock/f40-build-759522-120571/root/chroot_tmpdir/scmroot/ceres-solver'...
$ git fetch origin 2936ba671c28d92d729ce99ccbaa6c9cf1166516:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ceres-solver
 * [new ref]         2936ba671c28d92d729ce99ccbaa6c9cf1166516 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2936ba6 Update to 2.2.0