$ git clone -n https://gitee.com/src-anolis-os/llvm.git /var/lib/mock/dist-an23-build-314369-67515/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/dist-an23-build-314369-67515/root/chroot_tmpdir/scmroot/llvm'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/src-anolis-os/llvm
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a7de0e [LoongArch] Backport patches