$ git clone -n https://gitee.com/xinlong-chen/llvm-toolset-20 /var/lib/mock/dist-oc9-epol-build-230855-81526/root/chroot_tmpdir/scmroot/llvm-toolset-20
Cloning into '/var/lib/mock/dist-oc9-epol-build-230855-81526/root/chroot_tmpdir/scmroot/llvm-toolset-20'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/xinlong-chen/llvm-toolset-20
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7f08cd unify spec - 2