$ git clone -n https://gitee.com/src-opencloudos-rpms/nss.git /var/lib/mock/dist-oc9-build-62010-16463/root/chroot_tmpdir/scmroot/nss
Cloning into '/var/lib/mock/dist-oc9-build-62010-16463/root/chroot_tmpdir/scmroot/nss'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/nss
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6396c7f import nss-3.93-3.tl4