From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Hinsen <konrad.hinsen@fastmail.net>
Subject: Re: bug#38529: Make --ad-hoc the default for guix environment
 proposed deprecation mechanism
Date: Sat, 21 Dec 2019 16:18:29 +0100
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To: Ricardo Wurmus <rekado@elephly.net>
Cc: Guix Devel <guix-devel@gnu.org>, 38529@debbugs.gnu.org

Hi Ricardo,

> I wonder if we should simply bump the version number to indicate that
> this is a breaking change?

That's a possibility, but who ever looks at Guix version numbers?

> Another more difficult option would be to do what responsible API
> developers on the web do: to version their API and to make the API
> version selectable.  I don=E2=80=99t know *how* to do this elegantly, and

That's an interesting idea which would also take care of similar
situations in the future.

One way to implement this is to have executables "guix1", "guix2"
etc. Most users would then define an alias "guix" for interactive use,
but hopefully script authors would use the versioned executables.

Cheers,
  Konrad.