$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_cksum.git /var/lib/mock/f40-build-781155-131430/root/chroot_tmpdir/scmroot/rust-uu_cksum
Cloning into '/var/lib/mock/f40-build-781155-131430/root/chroot_tmpdir/scmroot/rust-uu_cksum'...
$ git fetch origin 31100db1ad906f8f985720451443e46fe52e9439:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_cksum
 * [new ref]         31100db1ad906f8f985720451443e46fe52e9439 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31100db Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild