[bug#32933] [PATCH] guix: add license prefix hackage imports

[Ricardo Wurmus <rekado@elephly.net>]

Hi Joe,

> The motivation was to be consistent with the `gnu/packages/haskell.scm` which
> uses the `license:` prefix. I noticed this when I imported a bunch of packages
> and all of them were missing the prefix, which then had to be manually added.
>
> On Fri, Oct 12, 2018 at 6:17 AM Ludovic Courtès <ludo@gnu.org> wrote:
>>
>> No strong opinion, but apparently none of the importers currently adds
>> the ‘license:’ prefix and I’d rather keep that consistent, one way or
>> another.
>
> That's not entirely true. crate calls `spdx-string->license` which adds the
> prefix, but it doesn't appear to actually work because it looks for the license
> in the wrong part of the json output from crates.io.

I have a slight preference to not adding the prefix.  It is true that
most modules do use this prefix, but I think the importers should be
agnostic of that.  Some modules don’t use this prefix (e.g. web.scm) or
no prefix at all (especially user modules that don’t exist yet).

I’d rather have the importers be more flexible and do the right thing
dependent on context, but I have no good idea how to accomplish this
considering that they are used outside of any context (unless they were
called as part of an updater).

--
Ricardo