Re: guix package conflict

[Carlo Zancanaro]

On Sat, Aug 10 2019, Ricardo Wurmus wrote:
> > hint: Try upgrading both `python-pycairo' and `gtk+', or remove 
> > one of them from the profile.
>
> Have you tried that?

In particular, I think `guix package -i python-pycairo gtk+` might 
do the trick.

> Does “guix package -u” not fix this problem for you?  Or is this 
> the output of “guix package -u”?

It looks like `guix package -u` compares the version of the 
package, and only updates if the package's version has changed 
(and even then, only if it has increased). This means that if a 
package's inputs (and thus its store hash) have changed, but its 
version has not, the version left in the profile will have 
outdated inputs, which can conflict if they are propagated. So 
`guix package -u` doesn't fix this problem.

`guix package -i`, on the other hand, just installs whatever it's 
told to, so it will install the same package at the same version, 
but with updated inputs. Then all the propagated inputs end up 
being the same, so there is no conflict.

Carlo