$ git clone -n https://gitee.com/opencloudos-stream/rubygem-sys-uname.git /var/lib/mock/dist-oc9-epol-build-84698-57382/root/chroot_tmpdir/scmroot/rubygem-sys-uname
Cloning into '/var/lib/mock/dist-oc9-epol-build-84698-57382/root/chroot_tmpdir/scmroot/rubygem-sys-uname'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/rubygem-sys-uname
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f47792 package init