$ git clone -n https://gitee.com/zhang-anmeng/llvm.git /var/lib/mock/dist-an23-build-442274-73171/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/dist-an23-build-442274-73171/root/chroot_tmpdir/scmroot/llvm'...
$ git fetch origin 6e1cc0f3958f55dad53c2f2cdf6c5b3024571e05:KOJI_FETCH_HEAD
From https://gitee.com/zhang-anmeng/llvm
 * [new ref]         6e1cc0f3958f55dad53c2f2cdf6c5b3024571e05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e1cc0f fix build error for riscv64