$ git clone -n https://src.fedoraproject.org/rpms/rust-dummy.git /var/lib/mock/f40-build-2640814-66422/root/chroot_tmpdir/scmroot/rust-dummy
Cloning into '/var/lib/mock/f40-build-2640814-66422/root/chroot_tmpdir/scmroot/rust-dummy'...
$ git fetch origin 637f3e3d8d1f459c85b4a29b5bd8916a29cb9717:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dummy
 * [new ref]         637f3e3d8d1f459c85b4a29b5bd8916a29cb9717 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 637f3e3 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild