Re: successful installation, but problems updating

[Leo Famulari <leo@famulari.name>]

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On Sat, Nov 11, 2017 at 10:29:30AM -0500, myglc2 wrote:
> On 11/10/2017 at 15:30 Chris Marusich writes:
> > Thank you for the clarification.  This is what I did not understand.  I
> > read the manual and got the impression that when --fallback has not been
> > given, if a given substitute cannot be found (regardless of whether or
> > not a substitute server claimed to provide one), then Guix will not
> > build it.  I see now that my understanding was mistaken.
> 
> I had this mistaken impression too.

It's important to remember that Guix is a build-from-source system. The
use of pre-compiled binaries is an optimization made possible by the
functional package model.

> +When substitutes are enabled (the default) and a substitute is not
> +available the build will take place locally. If a substitute is
> +available but substitution fails, e.g., the substitute server returns
> +404, 504, times out, or some other unexpected problem occurs, guix stops
> +and reports an error unless --fallback or --keep-going options are
> +specified.

To clarify, the default status of substitutes is different for Guix
(default disabled) and GuixSD (default enabled).

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