$ git clone -n https://gitee.com/fundawang/llvm.git /var/lib/mock/dist-an23-build-190055-60770/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/dist-an23-build-190055-60770/root/chroot_tmpdir/scmroot/llvm'...
$ git reset --hard a31e227cf2a94bb1cf4025b37b00a0b9147ccb93
HEAD is now at a31e227 15.0.6