$ git clone -n https://gitee.com/opencloudos-stream/orca.git /var/lib/mock/dist-ocs23-build-79922-4655/root/chroot_tmpdir/scmroot/orca
Cloning into '/var/lib/mock/dist-ocs23-build-79922-4655/root/chroot_tmpdir/scmroot/orca'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/orca
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 14dfe3a !2 use python3 instead of python by default. Merge pull request !2 from cunshunxia/master