Add haskell.nix shell

[hamishmack]

No description provided.

[fendor]

Do you think both nix-ways should be supported or only one of them?

[pepeiborra]

IIUC correctly, this will track changes to the cabal.project file and never break, therefore no need to set up a CI job for it?

[hamishmack]

IIUC correctly, this will track changes to the cabal.project file and never break, therefore no need to set up a CI job for it?

Never say never. Is there a test for shell.nix that we could run on this as well?

[pepeiborra]

IIUC correctly, this will track changes to the cabal.project file and never break, therefore no need to set up a CI job for it?

Never say never. Is there a test for shell.nix that we could run on this as well?

There is a GitHub action

[michaelpj]

FWIW, I'm not sure I'd recommend merging this unless some of the contributors to the project are actually keen on maintaining it! Maintaining other people's Nix code is never fun...

[pepeiborra]

The haskell-language-server Cachix account is limited to 5GB, so this won't work. I recommend using a different Cachix account for the haskell.nix artifacts, I can set up the token if you share it via email (pepeiborra@gmail.com).

To test it, you will have to open the PR from a GitHub.com/haskell/haskell-language-server branch, otherwise the GitHub action cannot see the token. I've given you push access

[pepeiborra]

I've set up the public Cachix account haskell-nix-language-server and the secret HLS_NIX_CACHIX_AUTH_TOKEN

[hamishmack]

I can set up the token if you share it via email

Sorry, I just saw this. Do you still need me to do this?

I've given you push access

I tried pushing the hkm/haskell-nix branch to haskell/haskell-language-server, but got:

ERROR: Permission to haskell/haskell-language-server.git denied to hamishmack.
Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.

It used quite a lot of github minutes building GHC.  Is it possible (and would it make sense) to use the IOHK cache instead of cachix (or better yet as an upstream cache if that is possible)?

[pepeiborra]

Github says that it is awaiting your response:

It makes sense to use the IOHK cache, as long as it freely accessible and also provides Mac OS builds?

[jneira]

@hamishmack hi, some update on this?

[pepeiborra]

I am happy to switch from shell.nix to this one if we set it up with Cachix properly. Otherwise it will be not viable for me (Mac OS here)

[berberman]

Moreover, do we have any plan to use Flakes? It's an experimental feature, providing functionality similar to niv but more powerful and concise. And there is a flake-compat to help us keep it backward compatible (default.nix and shell.nix will still be available for non-flake users).

[jneira]

@hamishmack do you still have plans to continue this?

[hamishmack]

My use case for this is now covered by Hix.

I can check a project builds with haskell.nix by installing or updating Hix as per the getting started guide, then cloning the project:

git clone https://github.com/haskell/haskell-language-server.git
cd haskell-language-server

Add configuration to nix/hix.nix or $HOME/.config/hix/hix.conf:

{ projectFileName = "cabal.project";
  shell.tools.cabal = {};
  sha256map."https://github.com/hsyl20/ghc-api-compat"."8fee87eac97a538dbe81ff1ab18cff10f2f9fa15" = "sha256-byehvdxQxhNk5ZQUXeFHjAZpAze4Ct9261ro4c5acZk=";
}

To build a project component:

hix-build -A hsPkgs.haskell-language-server.components.exes.haskell-language-server

or

hix build hsPkgs.haskell-language-server.components.exes.haskell-language-server

To build with cabal in a haskell.nix nix shell:

hix-shell --run 'cabal build all'

The getting started guide has example default.nix, shell.nix and flake.nix that use a nix/hix.nix configuration file if anyone else wants to migrate to haskell.nix (that way the regular Nix tools work the way the Hix ones do).