[bug#61363] [PATCH 2/2] self: Apply grafts to the outputs of the guix derivation.

[Christopher Baines <mail@cbaines.net>]

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Christopher Baines <mail@cbaines.net> writes:

> Ludovic Courtès <ludo@gnu.org> writes:
>
>>   2. More importantly, manually listing packages that might require
>>      grafting looks like a slippery slope (“oops! we’re not getting the
>>      GnuTLS graft for that CVE, too bad”).
>>
>> I designed and implemented several variants to try and delay grafting.
>> One of them consisted in carrying graft information in gexps:
>>
>>   https://git.savannah.gnu.org/cgit/guix.git/log?h=wip-gexp-grafts
>>
>> It’s kinda similar to what you’re proposing in that graft information is
>> carried as far as possible.  The main difference is that it’s automated.
>
> That's interesting, I think that making grafting not specific to
> packages, and something where the replacement is handled at a lower
> level (e.g. gexps) would be an alternative way to handle this.
>
> Given that this approach works though, maybe the explicit-grafting
> functionality could just sit and be used inside of (guix self). Given
> that module is very explicit about what packages are used, it should be
> possible to arrange the code so it's very hard to miss a package out,
> which should address your concern about manually listing packages (maybe
> specification->package can be tweaked so that it's possible to get all
> the packages, and that can be the list considered for grafting).
>
> I don't know of any other places where this approach would be useful, so
> while it would be nice to have a more general grafting mechanism
> eventually, I'd also like to be able to make these changes to channel
> instance grafts sooner rather than later.

I've sent a v2 series which changes along the above lines. The explicit
grafting stuff just sits in (guix self), and (guix self) more
rigeriously uses it's own definition of specification->package, which
should provide some protection against missing packages out. Obviously
it's not quite as rigerous as moving the grafting functionality in to
gexps, but hopefully it's rigerous enough for now.

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