On Thu, 20 Dec 2018 17:28:42 +0100
Ludovic Courtès <ludo@gnu.org> wrote:

> Then again, I expect that a growing number of packages will be obtained
> through ‘git-fetch’, and the updater for such a thing is trivial
> (interestingly it’s not yet implemented though :-)).

See http://debbugs.gnu.org/cgi/bugreport.cgi?bug=33809

`~Eric