Nixos-rebuild switch failing after flake update (solved: impermanence bug)

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1

I updated flakes and started getting errors in sudo nixos-rebuild switch with no clear pointers to what the issue is. Output below:

error:
… while calling the ‘head’ builtin

     at /nix/store/16a8jg8zn1xd5a1b9jmwmafr007dmzfx-source/lib/attrsets.nix:922:11:

      921|         || pred here (elemAt values 1) (head values) then
      922|           head values
         |           ^
      923|         else

   … while evaluating the attribute 'value'

     at /nix/store/16a8jg8zn1xd5a1b9jmwmafr007dmzfx-source/lib/modules.nix:807:9:

      806|     in warnDeprecation opt //
      807|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
         |         ^
      808|         inherit (res.defsFinal') highestPrio;

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

   error: attribute 'utils' missing

   at /nix/store/16a8jg8zn1xd5a1b9jmwmafr007dmzfx-source/lib/modules.nix:506:28:

      505|         builtins.addErrorContext (context name)
      506|           (args.${name} or config._module.args.${name})
         |                            ^
      507|       ) (lib.functionArgs f);

full show-trace in link here: PrivateBin

The full trace suggests it errors on home-manager side I guess. Nothing on my HM config has changed other than the flake being updated.

Flake info:

Path: /nix/store/xl0xa9pg7lcahir3wg6hskvdk1kxvkpx-source
Revision: 3bdb9b8c744aba080e36292e0364a5e099c8d3ab-dirty
Last modified: 2023-12-06 21:50:11
Inputs:
├───home-manager: github:nix-community/home-manager/d5824a76bc6bb93d1dce9ebbbcb09a9b6abcc224
│ └───nixpkgs follows input ‘nixpkgs-stable’
├───impermanence: github:nix-community/impermanence/8d16ac97980b3641078dd7c11337bfaa77b45789
├───nix-colors: github:misterio77/nix-colors/37227f274b34a3b51649166deb94ce7fec2c6a4c
│ ├───base16-schemes: github:tinted-theming/base16-schemes/d95123ca6377cd849cfdce92c0a24406b0c6a789
│ └───nixpkgs-lib: github:nix-community/nixpkgs.lib/819180647f428a3826bfc917a54449da1e532ce0
├───nixos-hardware: github:NixOS/nixos-hardware/a15b6e525f5737a47b4ce28445c836996fb2ea8c
├───nixpkgs: github:NixOS/nixpkgs/6df37dc6a77654682fe9f071c62b4242b5342e04
├───nixpkgs-stable: github:NixOS/nixpkgs/0b3d618173114c64ab666f557504d6982665d328
└───sops-nix: github:Mic92/sops-nix/e523e89763ff45f0a6cf15bcb1092636b1da9ed3
├───nixpkgs follows input ‘nixpkgs’
└───nixpkgs-stable follows input ‘nixpkgs-stable’

Any good ideas how to debug/fix the issue?

2

That does not look like stable.

Do you have matching releases between home-manager and whatever your actual system nixpkgs is?

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3

I believe nix flake info always shows hash instead of branch. That hash should be latest commit in 23.11 branch.

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4

Found the problem by downgrading each flake one by one. Issue is in latest impermanence commit, also tracked here: Regression after using escapeSystemdPath · Issue #157 · nix-community/impermanence · GitHub

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