$ git clone -n https://gitee.com/src-opencloudos-rpms/flex.git /var/lib/mock/dist-oc9-build-46115-14592/root/chroot_tmpdir/scmroot/flex
Cloning into '/var/lib/mock/dist-oc9-build-46115-14592/root/chroot_tmpdir/scmroot/flex'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/flex
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c83c0a2 import flex-2.6.4-3.tl4