"proper" way to deactivate push for a remote?

["Robert P. J. Day" <rpjday@crashcourse.ca>]

 another feature i've seen for the very first time ... working with
kubernetes so i checked it out of github, and part of the instructions
for that is to make sure you don't accidentally try to push back to
the github remote, so the directions suggest:

$ git remote add upstream https://github.com/kubernetes/kubernetes.git
$ git remote set-url --push upstream no_push

  fair enough, i just assumed the word "no_push" was some magical
keyword in that context, but as i read it, all you need to do is put
*some* invalid URL value there, is that correct?

  and is that the accepted way to do that? what about just deleting
that line from .git/config? is that valid, or is there a different
recommendation for doing that? thanks.

rday