$ git clone -n https://gitee.com/opencloudos-stream/rust-nix0.20.git /var/lib/mock/dist-oc9-epol-build-97870-60131/root/chroot_tmpdir/scmroot/rust-nix0.20
Cloning into '/var/lib/mock/dist-oc9-epol-build-97870-60131/root/chroot_tmpdir/scmroot/rust-nix0.20'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/rust-nix0.20
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81f3f69 update