$ git clone -n https://gitee.com/opencloudos-stream/rust-rfc6979.git /var/lib/mock/dist-oc9-epol-build-88884-58299/root/chroot_tmpdir/scmroot/rust-rfc6979
Cloning into '/var/lib/mock/dist-oc9-epol-build-88884-58299/root/chroot_tmpdir/scmroot/rust-rfc6979'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/rust-rfc6979
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b5e919 update