$ git clone -n https://gitee.com/src-opencloudos-rpms/nettle.git /var/lib/mock/dist-oc9-build-43154-14591/root/chroot_tmpdir/scmroot/nettle
Cloning into '/var/lib/mock/dist-oc9-build-43154-14591/root/chroot_tmpdir/scmroot/nettle'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/nettle
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85afae4 import nettle-3.8.1-3.tl4