Package can have additional fields in guix repository, like
architecture, version, buid_status, source_type
build_status may contain such info. 
source_type could show if the package source url is one of those public git services (thus, user could enable proxy first).


Dec 15, 2018, 6:54 PM by bjoern.hoefling@bjoernhoefling.de:

> On Fri, 14 Dec 2018 05:41:37 +0100
> Ricardo Wurmus <> rekado@elephly.net <mailto:rekado@elephly.net>> > wrote:
>
>> The default use case is for users to have substitutes enabled and to
>> fetch binaries from a build farm.  The build farm tries to build all
>> packages, but not all builds succeed.  The daemon caches build
>> failures.
>>
>> This information, however, is not available for users.  The default
>> behaviour of Guix is to attempt building the package locally.  This is
>> fine for packages that the build farm hasn’t attempted yet, but it is
>> a waste of time when the build has already been attempted without
>> success.
>>
>
> +1
>
> Very good idea.
>
> Björn
>