unable to access `namespace` in overlays

[Yash-Garg]

I am facing this error when trying to access namespace in my overlays/default/default.nix file.

Am I doing something wrong w.r.t the overlay docs?

error:
       … while evaluating a branch condition
         at /nix/store/45p0ynsaqkavq8b0hz6qnn5jysxa4whs-source/flake.nix:54:13:
           53|             name: value:
           54|             if isAttrs value then
             |             ^
           55|               lhs.${name} or { } // value

       … while calling the 'isAttrs' builtin
         at /nix/store/45p0ynsaqkavq8b0hz6qnn5jysxa4whs-source/flake.nix:54:16:
           53|             name: value:
           54|             if isAttrs value then
             |                ^
           55|               lhs.${name} or { } // value

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: function 'anonymous lambda' called without required argument 'namespace'
       at /nix/store/c4cl90bvylskmpcxqvv06jwd8z19g63k-7zj60sd46hsmjmv2s7fp3hkbz78fivz7-source/overlays/default/default.nix:1:1:
            1| { lib, namespace, ... }:
             | ^
            2| final: prev: {

[jakehamilton]

Are you on the latest version?

[Yash-Garg]

Are you on the latest version?

Think so, I'm using the dev branch in my flake inputs.

{
  "snowfall-lib": {
    "inputs": {
      "flake-compat": "flake-compat_4",
      "flake-utils-plus": [
        "flake-utils-plus"
      ],
      "nixpkgs": [
        "nixpkgs"
      ]
    },
    "locked": {
      "lastModified": 1717625599,
      "narHash": "sha256-qX9VJizFEoiRWDEiVs5+2w4FclQNQVVPvGPESsZ1F8k=",
      "owner": "snowfallorg",
      "repo": "lib",
      "rev": "5a10d2e37b6c6223763fa7c00b974875e49f93cc",
      "type": "github"
    },
    "original": {
      "owner": "snowfallorg",
      "ref": "dev",
      "repo": "lib",
      "type": "github"
    }
  }
}

[jakehamilton]

Can you switch to main?

[Yash-Garg]

Can you switch to main?

I tried, getting the same issue.

[jakehamilton]

Can you share your config in a GitHub repository?

[Yash-Garg]

Can you share your config in a GitHub repository?

Sure, here's the flake.nix file. I haven't pushed the namespace changes on the repo since it wasn't working.

[Yash-Garg]

Hey, sorry to bother you but did you get a chance to look at the issue? @jakehamilton

[jakehamilton]

Haven't gotten around to taking a look just yet, sorry.

[songpola]

+1, Same problem here.

[anntnzrb]

As of c6238c8, it is not possible to use the namespace in overlays.

[anntnzrb]

Fixed

The namespace argument is now available in overlay files.

Root Cause

The create-overlays-builder function was not passing namespace to overlay imports, while create-overlays was. This inconsistency caused the error when overlays tried to access namespace.

Solution

Added inherit (snowfall-config) namespace; to the arguments passed to overlays in create-overlays-builder (snowfall-lib/overlay/default.nix:35).

Usage

You can now use namespace in your overlay files:

{ lib, namespace, ... }:
final: prev: {
  # Your overlay code with access to namespace
}

Closes #148
Commit: anntnzrb/snowfall-lib@b85b94d