$ git clone -n https://gitee.com/opencloudos-stream/rust-base64.git /var/lib/mock/dist-oc9-epol-build-86839-57884/root/chroot_tmpdir/scmroot/rust-base64
Cloning into '/var/lib/mock/dist-oc9-epol-build-86839-57884/root/chroot_tmpdir/scmroot/rust-base64'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/rust-base64
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65f0ba0 update