Re: Mechanism for helping in multi-channels configuration

[Maxim Cournoyer]

Hi,

Simon Tournier <zimon.toutoune@gmail.com> writes:

> Hi,
>
> Well, using Guix bdab356 from a little bit more than one month old, then
> associating the channel guix-science 0b3d4a2f last week, I get the
> failure:
>
> $ guix build /gnu/store/g3aa5rh7bs5pyxd3q1gvhwz1s9z1vh3z-guix-science.drv
> The following derivation will be built:
>   /gnu/store/g3aa5rh7bs5pyxd3q1gvhwz1s9z1vh3z-guix-science.drv
> building /gnu/store/g3aa5rh7bs5pyxd3q1gvhwz1s9z1vh3z-guix-science.drv...
> (repl-version 0 1 1)
> WARNING: (guix-science build bazel-build-system): imported module (guix build 
> utils) overrides core binding `delete'
> (exception unbound-variable (value #f) (value "Unbound variable: ~S") (value 
> (python-nr-stream)) (value #f))
> builder for `/gnu/store/g3aa5rh7bs5pyxd3q1gvhwz1s9z1vh3z-guix-science.drv' 
> failed to produce output path 
> `/gnu/store/qzgj4vig3vklbznz1i0pgy11nr3z4rv9-guix-science'
> build of /gnu/store/g3aa5rh7bs5pyxd3q1gvhwz1s9z1vh3z-guix-science.drv failed
> View build log at 
> '/var/log/guix/drvs/g3/aa5rh7bs5pyxd3q1gvhwz1s9z1vh3z-guix-science.drv.gz'.
> guix build: error: build of 
> `/gnu/store/g3aa5rh7bs5pyxd3q1gvhwz1s9z1vh3z-guix-science.drv' failed
>
> Well, that’s expected!  Guix bdab356 does not contain python-nr-stream
> introduced by commit 7dfe41aa71a4a4a9d6065a44e9c6271717215b3e.
>
> The wishlist is: provide a machine-readable description on guix-science
> channel side in order to help in finding the good overlap between
> commits of different channels.
>
> It could be nice if instead of an hard error, “guix pull” could say:
> « the channel ’guix’ needs to be at least at commit 1234abc ».

Anything is better than an obscure failure/backtrace, so I'd say it's a
good idea, especially if you are motivated to hack on it.

-- 
Thanks,
Maxim