[bug#44178] Add a Go Module Importer

[Helio Machado <0x2b3bfa0@gmail.com>]

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Thanks for the ping, Marius! I've been quite busy with some yak shaving
tasks, but my importer is already working and has some interesting
improvements, like elegant module fetching from the official module proxy,
license extraction and recursive import support.

I need to fix an esoteric bug that trips the kernel's out-of-memory killer
when building a derivation with dependencies, but the importer part works
pretty well.

You can take a look to [my changes][1] for some readily backportable ideas,
like [the compact algorithm for uppercase path escaping][2].

Please forgive the code quality and the possible backwards-compatibility
mistakes; this is an unfinished proof of concept.

$ guix import go-modules -r github.com/FiloSottile/age # Please refer to
the issue 43872 for more information about the resting environment

[1]:
https://github.com/0x2b3bfa0/guix-go-modules/commit/5defe897065c5d3e63740932b360474132c77877
[2]:
https://github.com/0x2b3bfa0/guix-go-modules/blob/main/guix/build-system/go.scm#L65-L71

On Wed, 11 Nov 2020 at 02:19, Helio Machado <0x2b3bfa0@gmail.com> wrote:

> Thanks for the ping, Marius! I've been quite busy with some yak shaving
> tasks, but my importer is already working and has some interesting
> improvements, like elegant module fetching from the official module proxy,
> license extraction and recursive import support.
>
> I need to fix an esoteric bug that trips the kernel's out-of-memory killer
> when building a derivation with dependencies, but the importer part works
> pretty well.
>
> You can take a look to [my changes][1] for some readily backportable
> ideas, like [the compact algorithm for uppercase path escaping][2].
>
> Please forgive the code quality and the possible backwards-compatibility
> mistakes; this is an unfinished proof of concept.
>
> [1]:
> https://github.com/0x2b3bfa0/guix-go-modules/commit/5defe897065c5d3e63740932b360474132c77877
> [2]:
> https://github.com/0x2b3bfa0/guix-go-modules/blob/main/guix/build-system/go.scm#L65-L71
>
> On Tue, 10 Nov 2020 at 21:26, Marius Bakke <marius@gnu.org> wrote:
>
>> Katherine Cox-Buday <cox.katherine.e@gmail.com> writes:
>>
>> >>From cc92cbcf5ae89891f478f319e955419800bdfcf9 Mon Sep 17 00:00:00 2001
>> > From: Katherine Cox-Buday <cox.katherine.e@gmail.com>
>> > Date: Thu, 22 Oct 2020 19:40:17 -0500
>> > Subject: [PATCH] * guix/import/go.scm: Created Go Importer *
>> >  guix/scripts/import.scm: Created Go Importer Subcommand *
>> guix/import/go.scm
>> >  (importers): Added Go Importer Subcommand
>>
>> I just want to say thanks a lot for this!  I tested it, and it pretty
>> much works as advertised.
>>
>> Cc'ing Helio who was working on a Go importer as well recently.
>>
>

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