Julia packages on build farms?

[zimoun]

Hi,

I am confused by the missing Julia substitutes on Berlin (ci.guix).  And
I miss why the are missing – another topic; what recently changed on
master that could trigger this rebuild?

That’s said, I do not understand the result of “guix weather” and “guix
build”.  Let pick an example.  Using Guix 06493e7, the package
julia-staticarrays is unavailable on Berlin (ci.guix) and available on
Bordeaux (bordeaux.guix).  So far, so good!

--8<---------------cut here---------------start------------->8---
$ guix weather julia-staticarrays
computing 1 package derivations for x86_64-linux...
looking for 1 store items on https://ci.guix.gnu.org...
https://ci.guix.gnu.org
  0.0% substitutes available (0 out of 1)
  unknown substitute sizes
  0,0 MiB on disk (uncompressed)

  0.0% (0 out of 1) of the missing items are queued
  at least 1 000 queued builds
      x86_64-linux: 374 (37.4%)
      i686-linux: 341 (34.1%)
      powerpc64le-linux: 260 (26.0%)
      aarch64-linux: 25 (2.5%)
  build rate: 128.06 builds per hour
      x86_64-linux: 59.81 builds per hour
      i686-linux: 55.88 builds per hour
      powerpc64le-linux: 13.49 builds per hour
      aarch64-linux: 42.47 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)
  0,5 MiB of nars (compressed)
  4,7 MiB on disk (uncompressed)
  (continuous integration information unavailable)
--8<---------------cut here---------------end--------------->8---

Now, I get:

--8<---------------cut here---------------start------------->8---
$ guix build julia-staticarrays --substitute-urls=https://ci.guix.gnu.org -n
The following derivation would be built:
  /gnu/store/cinn2zy26791mp4d3qv2gda635a5a2r3-julia-staticarrays-1.2.13.drv

$ guix build julia-staticarrays --substitute-urls=https://bordeaux.guix.gnu.org 
-n
The following derivation would be built:
  /gnu/store/cinn2zy26791mp4d3qv2gda635a5a2r3-julia-staticarrays-1.2.13.drv
--8<---------------cut here---------------end--------------->8---

where the former is expected, not the latter.  Why is the package
locally built when “guix weather” says the substitutes is available?

What am I doing wrong?


Cheers,
simon