I seem to have found myself on the LuCI Master (git-17.249.21998-0c99b64) / LEDE Reboot SNAPSHOT r4795-f12a5b8 version build. I used "git clone https://git.lede-project.org/source".gitto get the files. I was sure I use received the stable ver the first time I build it.
You will have to checkout a specific branch. After cloning a git repository, you automatically start in the master branch. You would have to checkout the 17.01 branch or 17.01.2 tag to build that specific version. You can read about the process here: