$ git clone -n https://src.fedoraproject.org/rpms/rust-vec_map.git /var/lib/mock/f45-build-46051-830/root/chroot_tmpdir/scmroot/rust-vec_map
Cloning into '/var/lib/mock/f45-build-46051-830/root/chroot_tmpdir/scmroot/rust-vec_map'...
$ git fetch origin a014e768c833fd4a788b411feaa84ef36896984f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vec_map
 * [new ref]         a014e768c833fd4a788b411feaa84ef36896984f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a014e76 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild