$ git clone -n https://gitee.com/src-opencloudos-rpms/gmp.git /var/lib/mock/dist-oc9-build-69905-47358/root/chroot_tmpdir/scmroot/gmp
Cloning into '/var/lib/mock/dist-oc9-build-69905-47358/root/chroot_tmpdir/scmroot/gmp'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/gmp
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef22bc6 import gmp-6.3.0-1.tl4