[bug#54986] [PATCH] gnu: mpd: Add support for socket activation.

[Maxim Cournoyer]

Hi Liliana,

Liliana Marie Prikler <liliana.prikler@gmail.com> writes:

> Am Montag, dem 01.05.2023 um 11:53 -0400 schrieb Maxim Cournoyer:
>> > > Like Ludovic, I'm wondering what duplicating the Shepherd
>> > > endpoints API in Guix buys us?  [...]
>>
>> Instead of replicating the Shepherd API in Guix, could we use the
>> Shepherd API directly?  It's Scheme, and already depended on by Guix,
>> so the question arises.
> In theory, it'd be possible, albeit with some caveats:
> 1. Shepherd doesn't (didn't) have a full guix-style records API, which
> might cause discrepancies in otherwise normal-looking Scheme code.

Shepherd's code is pretty normal-looking Scheme code to me, last I
checked :-) I think Ludovic has also been working toward bringing it
closer to their standards, e.g. deprecating the use of GOOPS.

> 2. It'd probably make shepherd a compile-time dependency, which is
> avoided in other places in the code, i.e. (gnu build shepherd)

I wonder if that could be an acceptable price to pay?  It seems
reasonable to me that the close integration of Shepherd within Guix
introduces a dependency on it.

> 3. Shepherd records are (to my knowledge) not print-readable, so we'd
> have to move them through G-Expressions through some of our own code
> anyway; how strongly that would replicate the API is up to
> debate/speculation.

As far as I can tell, both are based on SRFI-9 records and use the same
representation, or I miss the fine details from the source.

-- 
Thanks,
Maxim