$ git clone -n https://gitee.com/llvm-la/clang.git /var/lib/mock/dist-an23.2-build-401269-72376/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23.2-build-401269-72376/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin e841da62b6292545e9404995af2d1cf7b7c17241:KOJI_FETCH_HEAD
From https://gitee.com/llvm-la/clang
 * [new ref]         e841da62b6292545e9404995af2d1cf7b7c17241 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e841da6 [Feature] Backport some patches from upstream on LoongArch