Substitute not downloading

Substitute not downloading

[Greg Hogan]

I have an up-to-date Guix but am unable to fetch the substitute from
  http://ci.guix.gnu.org/build/1332269/details

Are substitutes only available after the evaluation has completed?

--8<---------------cut here---------------start------------->8---
$ guix describe
Generation 9    May 09 2023 15:18:11    (current)
  guix c1ffe2f
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: c1ffe2f21bd1b9ba6bd527bbabe130144a69af71


guix install ungoogled-chromium
The following package will be installed:
   ungoogled-chromium 112.0.5615.165-1

The following derivations will be built:
  /gnu/store/lxix0vxmgdvvddk6wl2fdag7vrqhklky-profile.drv
  /gnu/store/92l92ljnq20q09bvjxlw42n5gl8shf38-ungoogled-chromium-112.0.5615.165-1.drv

611.0 MB will be downloaded
 chromium-112.0.5615.165.tar.xz  583.6MiB
--8<---------------cut here---------------end--------------->8---

Re: Substitute not downloading

[Andreas Enge]

Am Tue, May 09, 2023 at 11:43:01AM -0400 schrieb Greg Hogan:
> I have an up-to-date Guix but am unable to fetch the substitute from
>   http://ci.guix.gnu.org/build/1332269/details

So the link indicates that the build has succeeded "19 hours ago",
which would mean on May 9 around 14:30 UTC, which was about an hour
before you wrote this message.

> Are substitutes only available after the evaluation has completed?
> --8<---------------cut here---------------start------------->8---
> $ guix describe
> Generation 9    May 09 2023 15:18:11    (current)
>   guix c1ffe2f
>     repository URL: https://git.savannah.gnu.org/git/guix.git
>     branch: master
>     commit: c1ffe2f21bd1b9ba6bd527bbabe130144a69af71
> --8<---------------cut here---------------end--------------->8---

I think the substitute not being available may have to do with the
difference between the package being available in the store, and as a
nar file for substitution. As I understand it, the first request for a nar
can fail, then it is built in the background, and a later request after
a timeout will succeed. Hopefully offload specialists can correct potential
misconceptions on my side ;-)

Andreas

Re: Substitute not downloading

[Greg Hogan]

On Wed, May 10, 2023 at 5:35 AM Andreas Enge <andreas@enge.fr> wrote:
>
> I think the substitute not being available may have to do with the
> difference between the package being available in the store, and as a
> nar file for substitution. As I understand it, the first request for a nar
> can fail, then it is built in the background, and a later request after
> a timeout will succeed. Hopefully offload specialists can correct potential
> misconceptions on my side ;-)

A later attempt successfully downloaded the substitute. This
explanation sounds plausible, and it is a large package which would
explain the extended delay.

Greg