$ git clone -n https://gitee.com/yikanji/llvm.git /var/lib/mock/dist-an8.6-build-164654-58730/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/dist-an8.6-build-164654-58730/root/chroot_tmpdir/scmroot/llvm'...
$ git reset --hard c90bb9fd595d0a54d8831a18a1571564698edffc
HEAD is now at c90bb9f readme: add desc for branch