Re: Substitute not being used

[zimoun]

Hi,

On lun., 25 juil. 2022 at 21:42, Saku Laesvuori <saku@laesvuori.fi> wrote:
> I'm trying to install telegram-desktop and I *think* guix should be able
> to substitute it, but instead it tries to build it. (which then
> consistently fails, which is why I started looking into it)

Do you have allowed  substitutes?


> $ guix describe
> Generation 11 Jul 25 2022 10:15:41    (current)
>   guix 2367469
>     repository URL: https://git.savannah.gnu.org/git/guix.git
>     commit: 236746900f062b34c857c4aab21709bcf1448ac7
>
> There is a build for telegram-desktop for x86_64-linux
> (https://ci.guix.gnu.org/build/1119886/details) that is part of an
> evaluation on the same commit that my guix is on.

--8<---------------cut here---------------start------------->8---
$ guix time-machine --commit=2367469 -- weather telegram-desktop
computing 1 package derivations for x86_64-linux...
looking for 1 store items on https://ci.guix.gnu.org...
https://ci.guix.gnu.org
  100.0% substitutes available (1 out of 1)
  at least 44,6 MiB of nars (compressed)
  100,2 MiB on disk (uncompressed)

  at least 1 000 queued builds
      powerpc64le-linux: 990 (99.0%)
      i686-linux: 6 (.6%)
      x86_64-linux: 4 (.4%)
  build rate: 28.06 builds per hour
      x86_64-linux: 11.92 builds per hour
      aarch64-linux: 7.26 builds per hour
      i686-linux: 5.42 builds per hour
      powerpc64le-linux: 6.34 builds per hour
looking for 1 store items on https://bordeaux.guix.gnu.org...
https://bordeaux.guix.gnu.org
  100.0% substitutes available (1 out of 1)
  21,6 MiB of nars (compressed)
  100,2 MiB on disk (uncompressed)
  (continuous integration information unavailable)
--8<---------------cut here---------------end--------------->8---


> One confusing thing I've noticed while looking into this is that when
> guix starts building telegram-desktop it says it's building
>
> /gnu/store/aqhqhza58lzkvzxrspzbf8v9ssqvkxri-telegram-desktop-2.9.3.drv
>
> but the derivation on ci.guix.gnu.org is
>
> /gnu/store/gz50dz1rfaik7s33d22r2lmyzwd7f7bm-telegram-desktop-2.9.3.drv
>
> Can someone explain what's happening here and what I have misunderstood?

--8<---------------cut here---------------start------------->8---
$ guix time-machine --commit=2367469 -- build telegram-desktop -n -d
The following derivation would be built:
  /gnu/store/aqhqhza58lzkvzxrspzbf8v9ssqvkxri-telegram-desktop-2.9.3.drv

$ guix time-machine --commit=2367469 -- build telegram-desktop -n -d --no-grafts
/gnu/store/gz50dz1rfaik7s33d22r2lmyzwd7f7bm-telegram-desktop-2.9.3.drv
--8<---------------cut here---------------end--------------->8---


However, as you noticed, the ungrafted version seems substituable and
not the grafted one.

I agree it is confusing that “guix weather” reports an avaibility when
it is not the case for “guix build”.  Maybe, it can be considered as a
bug.


Cheers,
simon