ci: should enable treefmt flakeCheck

Is there an existing issue for this?

• I have searched the existing issues

What happened?

This was disabled because we couldn't get it to work.

Expected Behavior

No response

Steps To Reproduce

No response

Relevant log output

N/A

Screenshots

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Additional data

I think we need to fix with a wrapper script, something like:

{inputs, ...}: {
  imports = [
    inputs.treefmt-nix.flakeModule
  ];
  perSystem = {
    config,
    pkgs,
    ...
  }: let
    script = pkgs.writeScriptBin "treefmt" ''
      #! ${pkgs.bash}/bin/bash
      set -x
      set -e
      export MIX_REBAR3="${pkgs.rebar3}/bin/rebar3"
      exec ${pkgs.treefmt}/bin/treefmt "$@"
    '';

    wrapper = pkgs.symlinkJoin {
      name = "treefmt-wrapper";
      version = pkgs.treefmt.version;
      paths = [script pkgs.treefmt];
    };
  in {
    # Auto formatters. This also adds a flake check to ensure that the
    # source tree was auto formatted.

    treefmt = {
      flakeFormatter = true; # Enables treefmt the default formatter used by the nix fmt command
      flakeCheck = true; # Add a flake check to run treefmt, disabled, as mix format does need the dependencies fetched beforehand
      package = wrapper;
      projectRootFile = "VERSION"; # File used to identity repo root

      # we really need to mirror the treefmt.toml as we can't use it directly
      settings.global.excludes = [
        "*.gitignore"
        "*.dockerignore"
        ".envrc"
        "*.node-version"
        "Dockerfile"
        "grafana/Dockerfile"
        "Makefile"
        "VERSION"
        "LICENSE"
        "*.metadata"
        "*.manifest"
        "*.webmanifest"
        "*.dat"
        "*.lock"
        "*.txt"
        "*.csv"
        "*.ico"
        "*.png"
        "*.svg"
        "*.properties"
        "*.xml"
        "*.po"
        "*.pot"
        "*.json.example"
        "*.typos.toml"
        "treefmt.toml"
        "grafana/dashboards/*.json" # we use the grafana export style
      ];
      programs.mix-format.enable = true;
      settings.formatter.mix-format.includes = [
        "*.ex"
        "*.exs"
        "*.{heex,eex}"
      ];
      # run shellcheck first
      programs.shellcheck.enable = true;
      settings.formatter.shellcheck.priority = 0; # default is 0, but we set it here for clarity

      # shfmt second
      programs.shfmt.enable = true;
      programs.shfmt.indent_size = 0; # 0 means tabs
      settings.formatter.shfmt.priority = 1;

      programs.prettier.enable = true;

      programs.nixpkgs-fmt.enable = true;
    };
  };
}

Unfortunately this currently fails, it is looking for local.hex. Which hasn't been packaged in nix. I think local.hex just allows downloading other things, probably not what we want in nix.

We cannot download stuff in the wrapper script, being part of a nix build it doesn't have Internet access.

At this stage out of time to try to comprehend this, but thought I should document my findings.

nix flake check --override-input devenv-root "file+file://"<(printf %s "$PWD") .
warning: Git tree '/home/brian/tree/3rdparty/teslamate' is dirty
warning: not writing modified lock file of flake 'git+file:///home/brian/tree/3rdparty/teslamate':
• Updated input 'devenv-root':
    'file:///dev/null?narHash=sha256-d6xi4mKdjkX2JFicDIv5niSzpyI0m/Hnm8GGAIU04kY%3D'
  → 'file:///proc/self/fd/11?narHash=sha256-MR36Ywqs/zTxXcyqXW6MESFZ3X7OT91FF2wTpsZPoEg%3D'
error: builder for '/nix/store/mqcdlp6v87bdbvqja2r0jx3ix367wvpk-treefmt-check.drv' failed with exit code 1;
       last 15 log lines:
       > Initialized empty Git repository in /build/project/.git/
       > + set -e
       > + export MIX_REBAR3=/nix/store/d9r8459r3vr2c9g712hs1rbqmsvwwbl3-rebar3-3.24.0/bin/rebar3
       > + MIX_REBAR3=/nix/store/d9r8459r3vr2c9g712hs1rbqmsvwwbl3-rebar3-3.24.0/bin/rebar3
       > + exec /nix/store/frmyslc7ayg3afpcsnd5whn0zrhsrs6k-treefmt-2.0.5/bin/treefmt --config-file=/nix/store/6g4inxx2hj41cjgk81lazjp52sk4wvak-treefmt.toml --tree-root-file=VERSION --version
       > treefmt v2.0.5
       > + set -e
       > + export MIX_REBAR3=/nix/store/d9r8459r3vr2c9g712hs1rbqmsvwwbl3-rebar3-3.24.0/bin/rebar3
       > + MIX_REBAR3=/nix/store/d9r8459r3vr2c9g712hs1rbqmsvwwbl3-rebar3-3.24.0/bin/rebar3
       > + exec /nix/store/frmyslc7ayg3afpcsnd5whn0zrhsrs6k-treefmt-2.0.5/bin/treefmt --config-file=/nix/store/6g4inxx2hj41cjgk81lazjp52sk4wvak-treefmt.toml --tree-root-file=VERSION --no-cache
       > mix-format error:
       > Mix requires the Hex package manager to fetch dependencies
       > Shall I install Hex? (if running non-interactively, use "mix local.hex --force") [Yn] ** (Mix) Could not find an SCM for dependency :castore from TeslaMate.MixProject
       >
       > treefmt: error: formatting failure: formatter '/nix/store/r2bjg78m7b7s75lwcgn69svk010j3sqb-elixir-1.17.3/bin/mix' with options '[format]' failed to apply: exit status 1
       For full logs, run 'nix log /nix/store/mqcdlp6v87bdbvqja2r0jx3ix367wvpk-treefmt-check.drv'.
error: build of '/nix/store/iqfayabdc3qppi8xhdwy9g20nw6am7zs-vm-test-run-teslamate.drv', '/nix/store/mqcdlp6v87bdbvqja2r0jx3ix367wvpk-treefmt-check.drv' failed

Note that treefmt gets called multiple times also, the wrapper script needs to be able to cope.

Type of installation

Manual

Version

master