$ git clone -n https://gitee.com/opencloudos-stream/s3cmd.git /var/lib/mock/dist-oc9-epol-build-228980-81265/root/chroot_tmpdir/scmroot/s3cmd
Cloning into '/var/lib/mock/dist-oc9-epol-build-228980-81265/root/chroot_tmpdir/scmroot/s3cmd'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/s3cmd
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf908e2 !2 Fix requires python3-magic Merge pull request !2 from brucezhang/master