Emit integer keys with `pkgs.formats.yaml`

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1

Hi, I’m trying to emit integer keys with pkgs.formats.yaml. Does anyone know how to do it?

I’m trying to turn my LACT configuration to nix with services.lact.settings.

I attempted to directly translate my current config file into a nix struct:

...
          curve:
            50: 0.0
            63: 0.25
            71: 0.50
            77: 0.75
            82: 1.0
...
        gpu_vf_curve:
          2:
            voltage: 945
            clockspeed: 1905
...

My LACT config file has integer keys which I can’t directly express in nix (attribute set keys can’t be numbers)

I tried turning the integer keys into strings:

curve = {
  "50" = 0.0;
  "63" = 0.25;
  "71" = 0.5;
  "77" = 0.75;
  "82" = 1.0;
};

But it generated an invalid config file:

          curve:
            '50': 0.0
            '63': 0.25
            '71': 0.5
            '77': 0.75
            '82': 1.0

which prevented lactd from starting:

Error: Could not deserialize config
Caused by:
    profiles.Steam.gpus.{...}.fan_control_settings.curve: invalid type: string "50", expected i32 at line 16 column 13
lactd.service: Main process exited, code=exited, status=1/FAILURE
1 Like
2

Can’t be done. The formatter uses JSON as an intermediate format, and JSON only has string keys, so the final json2yaml invocation always ensures that the output keys are strings too.

3

One solution is to add to lact a configFile option, similar to this PR

4

In case there is a misunderstanding:

The above PR is for a different package (glance). You’ll need to make your own modifications to lact (in a fork of nixpkgs), in a similar fashion to the glance modification, to achieve the desired functionality in lact.

If you want I can do it for you, just give me a shout.