$ git clone -n https://gitee.com/src-opencloudos-rpms/byacc.git /var/lib/mock/dist-oc9-build-40753-14591/root/chroot_tmpdir/scmroot/byacc
Cloning into '/var/lib/mock/dist-oc9-build-40753-14591/root/chroot_tmpdir/scmroot/byacc'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/byacc
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd1b78b import byacc-2.0.20210808-3.tl4