$ git clone -n https://gitee.com/src-opencloudos-rpms/gcc.git /var/lib/mock/dist-oc8-build-74809-51395/root/chroot_tmpdir/scmroot/gcc
Cloning into '/var/lib/mock/dist-oc8-build-74809-51395/root/chroot_tmpdir/scmroot/gcc'...
$ git fetch origin dd6b0e980b2de8b2004da8c546313dab398d8d1e:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/gcc
 * [new ref]         dd6b0e980b2de8b2004da8c546313dab398d8d1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd6b0e9 import gcc-8.5.0-21.tl3.1