$ git clone -n https://gitee.com/src-opencloudos-rpms/nss-altfiles.git /var/lib/mock/dist-oc9-build-47381-14592/root/chroot_tmpdir/scmroot/nss-altfiles
Cloning into '/var/lib/mock/dist-oc9-build-47381-14592/root/chroot_tmpdir/scmroot/nss-altfiles'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/nss-altfiles
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d18700a import nss-altfiles-2.18.1-3.tl4