[gentoo-user] Haskell hell

[gentoo-user] Haskell hell

[Klaus Ethgen]

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Hi Folks,

Currently I suffer from the bad haskell hell. I need the current
git-annex that is only available in the haskell overlay.

Unfortunately this brings me into the haskell dependency hell. For two
days I am constantly adding keywords for one more package, emerging it,
doing haskell-updater, doing emerge @preserved-rebuild and starting over
again.

It seems that no single package in thatoverlay, that is marked green is
working and I have to add a keyword overwrite for them.

Isn't there a way to escape the haskell dependency hell? Is there a
clean way to compile and use haskell stuff? That is a real nightmare.

Regards
   Klaus
- -- 
Klaus Ethgen                                       http://www.ethgen.ch/
pub  4096R/4E20AF1C 2011-05-16            Klaus Ethgen <Klaus@Ethgen.ch>
Fingerprint: 85D4 CA42 952C 949B 1753  62B3 79D0 B06F 4E20 AF1C
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Re: [gentoo-user] Haskell hell

[Klaus Ethgen]

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Ah, I forgot to mention circular dependencies...

Regards
   Klaus
- -- 
Klaus Ethgen                                       http://www.ethgen.ch/
pub  4096R/4E20AF1C 2011-05-16            Klaus Ethgen <Klaus@Ethgen.ch>
Fingerprint: 85D4 CA42 952C 949B 1753  62B3 79D0 B06F 4E20 AF1C
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Re: [gentoo-user] Haskell hell

[John Covici]

On Fri, 05 Oct 2018 02:55:38 -0400,
Klaus Ethgen wrote:
> 
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> Hash: SHA512
> 
> Hi Folks,
> 
> Currently I suffer from the bad haskell hell. I need the current
> git-annex that is only available in the haskell overlay.
> 
> Unfortunately this brings me into the haskell dependency hell. For two
> days I am constantly adding keywords for one more package, emerging it,
> doing haskell-updater, doing emerge @preserved-rebuild and starting over
> again.
> 
> It seems that no single package in thatoverlay, that is marked green is
> working and I have to add a keyword overwrite for them.
> 
> Isn't there a way to escape the haskell dependency hell? Is there a
> clean way to compile and use haskell stuff? That is a real nightmare.

I use the overlay and the last major update was a pain.  I had  errors
when compiling the preserved-rebuild list, so I had to create a bash
script and do them individually.  Sometimes a package needed something
further down in the list, so I had to compile that one first.  If I
remember correctly I had to compile a couple of packages with
--nodeps, but I am not sure about that.  I hope this helps you.

-- 
Your life is like a penny.  You're going to lose it.  The question is:
How do
you spend it?

         John Covici wb2una
         covici@ccs.covici.com

Re: [gentoo-user] Haskell hell

[Florian Gamböck]

Hi Klaus,

On 2018-10-05 07:55, Klaus Ethgen wrote:
> Currently I suffer from the bad haskell hell. I need the current 
> git-annex that is only available in the haskell overlay.
>
> (...)
>
> Isn't there a way to escape the haskell dependency hell? Is there a 
> clean way to compile and use haskell stuff? That is a real nightmare.

first of all, let me tell you that I am not a Haskell expert and the 
following is only based on my personal experience.

I had similar problems with using pandoc, which also guides me in the 
"Haskell hell", as you call it. However, since I added 'dev-haskell/*' 
into my package.keywords, I have not experienced anything problematic 
anymore.

As for rebuilds and preserved libs, sometimes (rarely) after big updates 
I get segmentation faults and the like with Haskell packages. Since I 
have "buildpkg" in my FEATURES, I can do the following: Remove the 
complete dev-haskell folder in my bin-package directory, plus maybe the 
packages, that depend on them, so app-text/pandoc or dev-vcs/git-annex. 
And then I recompile every package, that does not have a binary package 
present. This way, even if some packages fail because of OOM or the 
like, I can just continue where I left off, because the succeeded 
ebuilds created binary packages.

I have never used haskell-updater, I never needed to.

So, to summarize:

-   dev-haskell/* to package.keywords
-   use buildpkg when compiling/upgrading haskell

Disclaimer: Your experience MAY vary. ;-)

-- 
Regards

Flo

Re: [gentoo-user] Haskell hell -- next itteration

[Klaus Ethgen]

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Hi,

Am Fr den  5. Okt 2018 um  8:59 schrieb Florian Gamböck:
> -   dev-haskell/* to package.keywords

That helped somehow.

It is not that git-annex does compile now. It doesn't, it has some
compile errors.

But now I have another problem. Emerge wants to install
dev-haskell/tagged-0.8.4:0/0.8.4::gentoo while 0.8.5 is already
installed.

WHY???

   Calculating dependencies... done!
   [nomerge       ] dev-util/shellcheck-0.5.0-r1:0/0.5.0::gentoo  USE="-doc -hscolour (-profile) -test"
   [nomerge       ]  dev-haskell/semigroups-0.18.5:0/0.18.5::haskell  USE="binary transformers -doc -hoogle -hscolour (-profile)"
   [ebuild     UD#]   dev-haskell/tagged-0.8.4:0/0.8.4::gentoo [0.8.5:0/0.8.5::haskell] USE="-doc -hscolour (-profile) (-hoogle%)" 0 KiB

   Total: 1 package (1 downgrade), Size of downloads: 0 KiB

   !!! Multiple package instances within a single package slot have been pulled
   !!! into the dependency graph, resulting in a slot conflict:

   dev-haskell/tagged:0

     (dev-haskell/tagged-0.8.4:0/0.8.4::gentoo, ebuild scheduled for merge) pulled in by
       <dev-haskell/tagged-1:0/0.8.4= required by (dev-haskell/semigroups-0.18.5:0/0.18.5::haskell, installed)
			    ^^^^^^^^^
       (and 1 more with the same problem)

     (dev-haskell/tagged-0.8.5:0/0.8.5::haskell, installed) pulled in by
       <dev-haskell/tagged-0.9:0/0.8.5= required by (dev-haskell/aeson-1.3.1.1:0/1.3.1.1::haskell, installed)
			      ^^^^^^^^^
       (and 1 more with the same problem)

That makes no sense at all! 0.8.5 is clearly below 0.9 or 1.

I even tried to let emerge build the lower version of dev-haskell/tagged
but that failed even though it is marked stable.

So I added a mask for it (=dev-haskell/tagged-0.8.4). But as you can see
above, emerge wants to use it nevertheless.

Anybody an idea how to fix that?

Regards
   Klaus
- -- 
Klaus Ethgen                                       http://www.ethgen.ch/
pub  4096R/4E20AF1C 2011-05-16            Klaus Ethgen <Klaus@Ethgen.ch>
Fingerprint: 85D4 CA42 952C 949B 1753  62B3 79D0 B06F 4E20 AF1C
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