Re: 'guix install' downloads all outputs for packages with cmake build system.

[nigko]

Hello Rutherther,

On Wed, Dec 11, 2024 at 1:54 PM Rutherther <rutherther@ditigal.xyz> wrote:
> You are building the package. I think I've already explained it on
> the IRC few weeks ago: due to how guix is made, build always builds
> all outputs. That is because when you are building the package,
> there is just one build process and in middle of that process
> some files are copied to other outputs. With `guix build`, you cannot
> even specify the outputs. So even on substitution, you get all
> of them. That's what you would get if nothing was substituted
> and the build ran on your system.
>
> > Moreover, since then I have realized that the problem is not specific
> > to packages with cmake build system but concerns all packages with
> > multiple outputs.
>
> Yes, with guix build it is for all packages, is expected,
> and there is likely no way around it. Please provide guix install
> example, where this happens, that's what you reported as an issue earlier.
> With install, you no longer need to get all outputs,
> when you do not need to build the package,
> so you should be able to get just one output as long as
> it is substituted. So indeed, if install substitutes all outputs
> for some packages, something is wrong and it should be possible to fix it.

You are right. Here is the output of guix install:
-------------------------begin--------------------------------------------------
$ guix install x265
guix install: warning: Your Guix installation is 16 days old.
guix install: warning: Consider running 'guix pull' followed by
'guix package -u' to get up-to-date packages and security updates.

The following package will be installed:
   x265 3.5

substitute: updating substitutes from
'https://cuirass.genenetwork.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 100.0%
3.9 MB will be downloaded
 x265-3.5-static  2.2MiB
 x265-3.5  1.5MiB
The following derivation will be built:
  /gnu/store/5vpq2pqp6s4ig6m0mcwrcbhv22ks2i9j-profile.drv
...
-------------------------end----------------------------------------------------

And here is the version with --no-grafts option (after cleaning the
store, of course):
-------------------------begin--------------------------------------------------
$ guix install --no-grafts x265
guix install: warning: Your Guix installation is 16 days old.
guix install: warning: Consider running 'guix pull' followed by
'guix package -u' to get up-to-date packages and security updates.

The following package will be installed:
   x265 3.5

The following derivation will be built:
  /gnu/store/vzs886g803pzp0wfg94z6ckqlyl2z16v-profile.drv

1.6 MB will be downloaded
 x265-3.5  1.5MiB
generating GLib schema cache...
...
-------------------------end----------------------------------------------------

Regards,
Nigko