GNU bug report logs - #38529
Make --pure the default for `guix environment'?

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Konrad Hinsen <konrad.hinsen <at> fastmail.net>
Cc: guix-devel <at> gnu.org, 38529 <at> debbugs.gnu.org
Subject: bug#38529: Deprecating ‘guix environment’?
Date: Thu, 19 Dec 2019 17:31:24 +0100

Hi Konrad,

Konrad Hinsen <konrad.hinsen <at> fastmail.net> skribis:

> On 16/12/2019 23:09, Ludovic Courtès wrote:
>> So in a more algorithmic manner:
>>> 1. if ad-hoc and inputs-of is present at the same invocation: fail
>>> hard. (With an error like incompatible options present)
>>> 2. if only ad-hoc is present, then print a deprecation warning (yes,
>>> we could make this suspendable with an environment variable, like you
>>> described)
>>> 3. if only inputs-of present, then do the new behaviour.
>>> 4. if neither ad-hoc nor inputs-of present then
>>>    a. if GUIX_ENVIRONMENT_DEPRECATED is 1: do the current behaviour,
>>>    b. if GUIX_ENVIRONMENT_DEPRECATED is undefined, or is not 1: do the
>>> new behaviour.
>> That sounds like a good plan to me.
>>
>> #4 is the trickiest, and I think it’d be good to give users a bit of
>> time so they can start adjusting before deprecation is in effect.
>
> #4 is trickiest for another reason: there is no future-proof use of
> "guix environment" that works right now and will continue to work. Nor
> is there any way to see, when looking at a command line, whether it's
> old-style or new-style, if neither --ad-hoc nor --inputs-of are
> present. This means that all existing documentation (tutorials etc.)
> will become misleading in the future. Worse, even documentation
> written today, in full awareness of a coming change, can't do better
> than saying "watch out, this will do something else in the future".
>
> The first rule of backwards-compatibility is: never change the meaning
> of an existing valid command/API. Add new valid syntax, deprecate old
> valid syntax, but don't change the meaning of something that was and
> will be valid.

Yeah.

Clearly there’s a tension between that and keeping Guix open to changes.

> How about a more drastic measure: deprecate "guix environment" and
> introduce a new subcommand with the desired new behaviour?

That has the advantage of avoiding the problem you mention altogether
while also allowing for further changes.

The hard question then becomes: what do we call it?  I vote against
abbreviations.  :-)

Also, what other goals would we set for that command?  How would we
frame it in the set of commands?

Thanks,
Ludo’.

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