$ git clone -n https://gitee.com/lihuanyu410621/clang.git /var/lib/mock/dist-an23-build-456049-73644/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23-build-456049-73644/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin b83ada89e3039ed33cacac15e67aa017f26670ab:KOJI_FETCH_HEAD
From https://gitee.com/lihuanyu410621/clang
 * [new ref]         b83ada89e3039ed33cacac15e67aa017f26670ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b83ada8 Fix typo in spec file