$ git clone -n https://src.fedoraproject.org/rpms/google-cpu_features.git /var/lib/mock/f38-build-side-42-init-devel-1322848-30692/root/chroot_tmpdir/scmroot/google-cpu_features
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1322848-30692/root/chroot_tmpdir/scmroot/google-cpu_features'...
$ git fetch origin 8b2f5861602071a00eeee0774a924557483ed1e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/google-cpu_features
 * [new ref]         8b2f5861602071a00eeee0774a924557483ed1e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b2f586 Release 0.7.0| Compile with C++14