$ git clone -n https://gitee.com/opencloudos-stream/raptor2.git /var/lib/mock/dist-ocs23-build-50874-2151/root/chroot_tmpdir/scmroot/raptor2
Cloning into '/var/lib/mock/dist-ocs23-build-50874-2151/root/chroot_tmpdir/scmroot/raptor2'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/raptor2
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7d4b3d !3 downgrade to 2.0.15 Merge pull request !3 from Jackey_1024/master