Shallow update not allowed (git > 1.9)

Question

There are a lot of answers stating that git 1.9 removes limitations of shallow clones. Nevertheless, I\'m using 2.6.1 and still having the following basic issue:

Fir

Answer 1

I'm answering my own question.

I tried going the other way around and adding urxvt-perls as a remote for target, then fetching from there. This fails because of the same reason but led me closer to a solution. From the git-fetch man:

  --update-shallow
       By default when fetching from a shallow repository, git fetch
       refuses refs that require updating .git/shallow. This option
       updates .git/shallow and accept such refs.

Now, using this option allows the shallow fetch. So the previous question becomes: Is it possible to specify that --update-shallow behavior while pushing? Well, there is an option for that:

receive.shallowupdate
    If set to true, .git/shallow can be updated when new refs require
    new shallow roots. Otherwise those refs are rejected.

I'm still trying to set this in github and the likes, though.