$ git clone -n https://gitee.com/opencloudos-stream/cross-gcc.git /var/lib/mock/dist-oc9-epol-build-101375-65811/root/chroot_tmpdir/scmroot/cross-gcc
Cloning into '/var/lib/mock/dist-oc9-epol-build-101375-65811/root/chroot_tmpdir/scmroot/cross-gcc'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/cross-gcc
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 885d99c update