$ git clone -n https://src.fedoraproject.org/rpms/rust-atom.git /var/lib/mock/f38-build-side-43-rust-devel-1414854-31451/root/chroot_tmpdir/scmroot/rust-atom
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1414854-31451/root/chroot_tmpdir/scmroot/rust-atom'...
$ git fetch origin cad7a636c68779238aaf22db17d6ea3cf67f3686:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-atom
 * [new ref]         cad7a636c68779238aaf22db17d6ea3cf67f3686 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cad7a63 Update to version 0.3.6