$ git clone -n https://src.fedoraproject.org/rpms/rust-joinery2.git /var/lib/mock/f40-build-2652149-66891/root/chroot_tmpdir/scmroot/rust-joinery2
Cloning into '/var/lib/mock/f40-build-2652149-66891/root/chroot_tmpdir/scmroot/rust-joinery2'...
$ git fetch origin cff5d34a79d798b0f3488fd0097ef69594efd225:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-joinery2
 * [new ref]         cff5d34a79d798b0f3488fd0097ef69594efd225 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cff5d34 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild