Commit f5c63e45 authored by Yuanle Song's avatar Yuanle Song
Browse files

add flake.nix.not-working 

failed to use ghc from store, it insists build from source. I gave up.
parent 5654ef56

flake.nix.not-working

0 → 100644
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{

  description = "download large files across unreliable network via HTTP";

  inputs.haskellNix.url = "github:input-output-hk/haskell.nix";

  inputs.nixpkgs.follows = "haskellNix/nixpkgs-2311";

  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, nixpkgs, flake-utils, haskellNix }:

    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:

    let

      overlays = [ haskellNix.overlay

        (final: prev: {

          # This overlay adds our project to pkgs

          rdProject =

            final.haskell-nix.project' {

              src = ./.;

              compiler-nix-name = "ghc928";

              # This is used by `nix develop .` to open a shell for use with

              # `cabal`, `hlint` and `haskell-language-server`

              shell.tools = {

                cabal = {};

                hlint = {};

                haskell-language-server = {};

              };

              # # Non-Haskell shell tools go here

              shell.buildInputs = with pkgs; [

                nixpkgs-fmt

              ];

              # This adds `js-unknown-ghcjs-cabal` to the shell.

              # shell.crossPlatforms = p: [p.ghcjs];

            };

        })

      ];

      pkgs = import nixpkgs { inherit system overlays; inherit (haskellNix) config; };

      flake = pkgs.rdProject.flake {};

    in flake // {

      # Built by `nix build .`

      legacyPackages = pkgs;

      packages.default = flake.packages."reliable-download:exe:rd-api";

    });



  # --- Flake Local Nix Configuration ----------------------------

  nixConfig = {

    # This sets the flake to use the IOG nix cache.

    # Nix should ask for permission before using it,

    # but remove it here if you do not want it to.

    extra-substituters = ["https://cache.iog.io"];

    extra-trusted-public-keys = ["hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="];

    allow-import-from-derivation = "true";

  };

}

operational

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* COMMENT -*- mode: org -*-

#+Date: 2018-05-04

Time-stamp: <2024-04-08>

Time-stamp: <2024-04-24>

#+STARTUP: content

* notes                                                               :entry:

** 2022-03-14 project dir structure
@@ -2307,6 +2307,145 @@ I can use haskell fork though. 
yes. see Route Patterns.



* wontfix                                                             :entry:

** 2024-04-24 try build this project using nix with flake.

- create flake.nix.

  https://www.tweag.io/blog/2020-05-25-flakes/

- how to build haskell project using nix flake

  Getting started with Flakes - Alternative Haskell Infrastructure for Nixpkgs

  https://input-output-hk.github.io/haskell.nix/tutorials/getting-started-flakes.html



  Introduction - Alternative Haskell Infrastructure for Nixpkgs

  https://input-output-hk.github.io/haskell.nix/index.html



  Motivation - Alternative Haskell Infrastructure for Nixpkgs

  https://input-output-hk.github.io/haskell.nix/motivation.html



  cable2nix

  stack2nix



  //motivation seems good.



  nix profile install nixpkgs#nix-tools

  //no package.



  cabal2nix pkg is in stackage. this is not from nix-tools.



  how to install nix-tools?



  haskell.nix/nix-tools at master · input-output-hk/haskell.nix

  https://github.com/input-output-hk/haskell.nix/tree/master/nix-tools

  there is a flake.nix file in git repo.



  just keep reading.



- the other solution is

  Haskell Support for Nix — haskell4nix 1 documentation

  https://haskell4nix.readthedocs.io/



  this one has no flake support.



*** how to build my project using haskell.nix?



- Getting started with Flakes - Alternative Haskell Infrastructure for Nixpkgs

  https://input-output-hk.github.io/haskell.nix/tutorials/getting-started-flakes.html

- add cache store and public key.

  on agem10,

  salthere nix

- TODO if this works, integrate nix build with ucompile.

  when flake.nix exists, use nix build.



  emacs IDE support

  https://input-output-hk.github.io/haskell.nix/tutorials/development.html#emacs-ide-support



  nix build .#reliable-download:test

  nix build .#reliable-download:test:all-tests

  2024-04-24 21:32:04 start

  2024-04-24 21:33:35 it's quite fast to fail. no such target.



  nix flake metadata .

  this is cool.

  it only defined inputs, no outputs?



  nix build .

  this works. it starts to fetch many files.

  it tries to build ghc-8.10.7, I don't want that.



  shouldn't there be a cache?

  comment out compiler-nix-name didn't work.

  too steep learning curve.



  https://input-output-hk.github.io/haskell.nix/troubleshooting.html#why-am-i-building-ghc

  okay. this is some document. good.

  choose a ghc version that is tested in CI.

  See ci.nix for the source of truth about what is built and tested.

  for nixpkg unstable, ghc810, ghc92, ghc94, ghc96, ghc98 are all supported?

  I can't understand ci.nix file.

  https://github.com/input-output-hk/haskell.nix/blob/master/ci.nix



  it still tries to build ghc 8.10.7.

  try remove .lock file and rebuild.

  nope. it still tries to build ghc 8.10.7.



  try use 2311

  inputs.nixpkgs.follows = "haskellNix/nixpkgs-2311";

  now it tries to fetch different dependencies from store cache.

  now it's fetching ghc-8.10.7 from sjtug store.

  then it continues build ghc 8.10.7 again. from source. WTF.

  // This will never work. I gave up.



  nix build .#reliable-download:lib:reliable-download

  nix build .#reliable-download:exe:rd-api

  nix build .#reliable-download:exe:rd



- how to define my tests and exe in flake.nix?



- get sha256 for git dependency.



  nix-prefetch-git https://gitlab.emacsos.com/sylecn/io-thread-pool.git 58041a07560383bac22f6702074242c3e2097106

  nix-prefetch-git https://gitlab.emacsos.com/sylecn/tinylog.git a49750ffb2923d40e834cec77a9900b4167c2ea5



  where can I find nix-prefetch-git tool?



  Nix Haskell Development (2020) - Guides - NixOS Discourse

  https://discourse.nixos.org/t/nix-haskell-development-2020/6170



  nix profile install nixpkgs#nix-prefetch-git



  it works.



- problems

  - build fail.

    #+begin_quote

    ...

    warning: Git tree '/home/sylecn/projects/reliable-download' is dirty

    error: flake 'git+file:///home/sylecn/projects/reliable-download' does not provide attribute 'packages.x86_64-linux.reliable-download:test', 'legacyPackages.x86_64-linux.reliable-download:test' or 'reliable-download:test'

    sylecn@agem10:~/projects/reliable-download$ nix build .#reliable-download:test:all-tests

    warning: Git tree '/home/sylecn/projects/reliable-download' is dirty

    error: flake 'git+file:///home/sylecn/projects/reliable-download' does not provide attribute 'packages.x86_64-linux.reliable-download:test:all-tests', 'legacyPackages.x86_64-linux.reliable-download:test:all-tests' or 'reliable-download:test:all-tests'

    sylecn@agem10:~/projects/reliable-download$ 

    #+end_quote



    #+begin_quote

    sylecn@agem10:~/projects/reliable-download$ nix build .#reliable-download:exec:rd-api

    error: flake 'git+file:///home/sylecn/projects/reliable-download' does not provide attribute 'packages.x86_64-linux.reliable-download:exec:rd-api', 'legacyPackages.x86_64-linux.reliable-download:exec:rd-api' or 'reliable-download:exec:rd-api'

    #+end_quote



    try find some full examples.

    hello world is not enough to see what's wrong in flake.nix.



    gh search: haskellNix path:flake.nix language:haskell



    this search is not precise enough.



    https://github.com/jgm/pandoc/blob/main/flake.nix

    this is using raw nix. without much help.

    you need to duplicate every dependencies already in stack package.yaml file.



  - is nix good for haskell project?



    What's all the hype with Nix? - Learn - Haskell Community

    https://discourse.haskell.org/t/whats-all-the-hype-with-nix/2593/18



** 2022-03-14 can I make tinylog log timestamp use localtime?

- L.DateFormat

  doesn't allow IO.

stack.yaml

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@@ -28,8 +28,10 @@ packages: 
extra-deps:

  - git: https://gitlab.emacsos.com/sylecn/io-thread-pool.git

    commit: 58041a07560383bac22f6702074242c3e2097106

    # nix-sha256: 04kj3bfn17mv02bs8ldfa37s52fq2ycqwjcdg4hyns1syy1csw0l

  - git: https://gitlab.emacsos.com/sylecn/tinylog.git

    commit: a49750ffb2923d40e834cec77a9900b4167c2ea5

    # nix-sha256: 1h21xckxd4ls8vinivsh5ibmjpccijc8nhh9zgqxlnvq56x62f7f



# Override default flag values for local packages and extra-deps

# flags: {}