$ git clone -n https://gitee.com/zhangwenlong01/ceph_2.git /var/lib/mock/dist-an23-build-333878-69630/root/chroot_tmpdir/scmroot/ceph_2
Cloning into '/var/lib/mock/dist-an23-build-333878-69630/root/chroot_tmpdir/scmroot/ceph_2'...
$ git fetch origin 639bea6c547d50461430745c90d8e570c7a22912:KOJI_FETCH_HEAD
From https://gitee.com/zhangwenlong01/ceph_2
 * [new ref]         639bea6c547d50461430745c90d8e570c7a22912 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 639bea6 update to 18.2.1