Upgrading Library in stack Project?

[Kevin Meredith]

What's the correct way to upgrade libraries in a stack project?

In my project, I have both a stack.yaml and cabal.config. The former only contains the Haskell version:

# Specifies the GHC version and set of packages available (e.g., lts-3.5, nightly-2015-09-21, ghc-7.10.2)

resolver: lts-8.13

However, the cabal.config contains a bunch of libraries' versions:

$head cabal.config 

-- Stackage snapshot from: http://www.stackage.org/snapshot/lts-8.12

-- Please place this file next to your .cabal file as cabal.config

-- To only use tested packages, uncomment the following line:

-- remote-repo: stackage-lts-8.12:http://www.stackage.org/lts-8.12

constraints: abstract-deque ==0.3,

             abstract-par ==0.3.3,

             AC-Vector ==2.3.2,

             accelerate ==0.15.1.0,

             accuerr ==0.2.0.2,

             ace ==0.6,

If I wanted to upgrade a library in my project, how would I do that? 

Thanks,

Kevin

[Adam Bergmark]

I'm not sure if there's a better way to refer to cabal.configs, but you can replace it by the latset one: https://www.stackage.org/lts-8.13/cabal.config

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[Kevin Meredith]

I'll try that. Thanks, Adam.

For my own learning, what's the meaning of this file?

It seems to be a listing of all Haskell LTS 8.13 libraries? Is that because Hackage hosts all Haskell libraries? 

[Adam Bergmark]

When using stack you simply refer to a snapshot by name, it essentially contains the same information as this cabal.config (while adding a lot of extra information) and is downloaded only once and stored somewhere in ~/.stack. AFAIK cabal-install doesn't allow you to refer to snapshots like this (maybe you can refer to a URL somehow?), I think you need the actual contents in a local cabal.config.

All packages in a stackage snapshot must be available on hackage which is why you can use it for cabal-install as well. So for cabal-install there is no dependency towards stack/stackage infrastructure once you've gotten this file, as it has no support for it.

HTH,

Adam

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[Dan Burton]

Note that stack.yaml is used by stack and ignored by cabal-install, while cabal.config is used by cabal-install and ignored by stack. The only reason to have both in your project is if you are accommodating both stack and cabal-install for building your project from the source repository. If you are only using stack to build your project, then you can safely delete the cabal.config.

-- Dan Burton

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