$ git clone -n https://gitee.com/fundawang/llvm.git /var/lib/mock/dist-an23-build-189928-60753/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/dist-an23-build-189928-60753/root/chroot_tmpdir/scmroot/llvm'...
$ git fetch origin bc7a0d1ddf65270f9804b229858915748f28b9ca:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/llvm
 * [new ref]         bc7a0d1ddf65270f9804b229858915748f28b9ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc7a0d1 br python3-recommonmark