Re: rolling back only a single package

[cdelia@dc.uba.ar]

Hi

On 2018-12-28 08:32, swedebugia wrote:
> "cdelia@dc.uba.ar" <cdelia@dc.uba.ar> skrev: (27 december 2018
> 20:52:23 CET)
> 
>> Hi,
>> 
>> I upgraded guix a couple of days ago, installed some things and now
>> I
>> found that xmobar just keeps segfaulting.
>> 
>> Switching to specific generation it's really cool, but in this case
>> would "uninstall" all the software that it's between the
>> update-generation and the current one.
>> 
>> So, there is any way to just downgrade a single package (resolving
>> it
>> dependencies) with out doing a full switch?
>> 
>> I guess this it's connected to
>> https://lists.gnu.org/archive/html/help-guix/2016-08/msg00028.html
>> 
>> And I could also switch and then manually re install. But maybe
>> there is
>> a standard or automatic way to do it.
>> 
>> Thanks!
> 
> Hi.
> I highly recommend you to use the declarative way of installing
> packages instead. See the manual.
> 

I'm intending to, but before that I rather install when need it, when 
some pseudo complete usable system arise I'll write a declaration.

Declarative it's great, but you have to get in your head all the things 
that you'll need, before even beginning ...

> You can use the former xmobar directly from the store if you have it
> or you could create an own package/channel that specifies the version
> you want.
> 

Well... I never GC nor delete generations. So it should be possible.
But I believe that's a temporal work around that should not be used.

If I don't delete the generation that holds the earlier working version, 
I could do that,
  but then I'll need to use the full path in the store or a symblink 
manually created.

I think that kind of stuff it's a tiny, but accumulative step towards 
chaos. And I'm using git to scape from it XD

> The best thing though is to report a bug and help by providing
> information e.g. by stracing it. Guide evolves quickly...

It's xmonad, a haskell app. I'm not to proficient in haskell yet to help 
with that.

If I've time I'll report the bug, at least.

> --
> Sent from my p≡p for Android.