$ git clone -n https://src.fedoraproject.org/rpms/rust-below-config.git /var/lib/mock/f40-build-2071757-49334/root/chroot_tmpdir/scmroot/rust-below-config
Cloning into '/var/lib/mock/f40-build-2071757-49334/root/chroot_tmpdir/scmroot/rust-below-config'...
$ git fetch origin 0b5842eda0dcbd027521611d1ae99d417b9f3f18:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-below-config
 * [new ref]         0b5842eda0dcbd027521611d1ae99d417b9f3f18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b5842e Update to 0.7.1