$ git clone -n https://src.fedoraproject.org/rpms/rust-slab.git /var/lib/mock/f40-build-2643535-66488/root/chroot_tmpdir/scmroot/rust-slab
Cloning into '/var/lib/mock/f40-build-2643535-66488/root/chroot_tmpdir/scmroot/rust-slab'...
$ git fetch origin 013a71cebde4e8981f0c9b7ea37f4b9c4d7f2f84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-slab
 * [new ref]         013a71cebde4e8981f0c9b7ea37f4b9c4d7f2f84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 013a71c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild