bug#38491: Evolution is missing GPG

[Leo Prikler]

Am Donnerstag, den 05.12.2019, 09:53 -0700 schrieb Jesse Gibbons:
> On Wed, 2019-12-04 at 13:11 +0100, Leo Prikler wrote:
> > Hi Guix,
> > 
> > I recently discovered, that Evolution would complain about a
> > missing
> > GPG whenever it encounters a signed message.  For the record, I've
> > only
> > installed evolution-data-server in the operating-system and
> > evolution
> > itself inside my user profile and not installed gpg in either
> > place,
> > thus causing this issue.  Would it make sense to make gpg an input
> > to
> > evolution and hardcode the path in the source?  Or would it perhaps
> > be
> > better to have it as propagated input?  WDYT?
> > 
> > Regards,
> > Leo
> > 
> > 
> > 
> > 
> Guix complains that it cannot find gpg when I call "guix import gnu
> <package>". But unless I'm using a function of guix that depends on
> gpg,
> guix is not broken, so gpg is not an input or propagated input of
> guix. I
> think we have the same situation here. Evolution is functional
> without GPG,
> and handles itself fairly well when gpg is not found.
> 
> Try installing gpg locally and see if it stops complaining. If so, we
> have a
> solution. If not, we should consider adding GPG as a propagated input
> to
> Evolution.
That does fix the problem itself, but I personally believe there should
be a better way of handling "optional" inputs -- "optional" because in
at least some if not many cases, people would expect them to exist. 
Guix' emacs has imagemagick as input for instance (even though it is
optional) and a separate emacs-minimal exists as the version without it
and other optional inputs.  I think this pattern could be applied more
broadly.

Regards,
Leo