Switch home configuration without rebuilding the system

[Nikola-Milovic]

I was wondering, what is the dynamic of home-manager with snowfall v3? I've read that in #7 standalone home manager is possible, my question is, how do I achieve this, and do I need to change anything in the modules themselves?

I currently have a system that enables option X. Then in my home manager modules depending on the osConfig.x i do different things, will this still work as indended? Since my system is systemA, and my home config is user@systemA I guess it should resolve correctly?

I have no issues with the current setup, it works wonderfully, I just dislike having to rebuild my entire system to get CSS change into my waybar, seems redundant. Are there any drawbacks to switching to standalone HM with snowfall?

[Nikola-Milovic]

It seems not possible at least with nh home switch

.dotfiles on  gammastep [+] ➜ nh home switch
warning: Git tree '/home/nikola/.dotfiles' is dirty
> Building home configuration
warning: Git tree '/home/nikola/.dotfiles' is dirty
error:
       … while evaluating a branch condition
         at /nix/store/ly4s3hw35dd1c2vsd694y2715pc1d2c1-source/lib/lists.nix:125:9:
          124|       fold' = n:
          125|         if n == len
             |         ^
          126|         then nul

       … while calling the 'length' builtin
         at /nix/store/ly4s3hw35dd1c2vsd694y2715pc1d2c1-source/lib/lists.nix:123:13:
          122|     let
          123|       len = length list;
             |             ^
          124|       fold' = n:

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

       error: function 'anonymous lambda' called without required argument 'osConfig'
       at /nix/store/l76yhqhh85m3vw99xm438h4dfjvfvpb6-3wbl663mrnsi7fvdrqbyw7hizlspzgkj-source/modules/home/desktop/bars/waybar/default.nix:1:1:
            1| {
             | ^
            2|   config,
┏━ 1 Errors: 
┃ error:
┃        … while evaluating a branch condition
┃          at /nix/store/ly4s3hw35dd1c2vsd694y2715pc1d2c1-source/lib/lists.nix:125:9:
┃           124|       fold' = n:
┃           125|         if n == len
┃              |         ^
┃           126|         then nul
┃ 
┃        … while calling the 'length' builtin
┃          at /nix/store/ly4s3hw35dd1c2vsd694y2715pc1d2c1-source/lib/lists.nix:123:13:
┃           122|     let
┃           123|       len = length list;
┃              |             ^
┃           124|       fold' = n:
┃ 
┃        (stack trace truncated; use '--show-trace' to show the full, detailed trace)
┃ 
┃        error: function 'anonymous lambda' called without required argument 'osConfig'
┃        at /nix/store/l76yhqhh85m3vw99xm438h4dfjvfvpb6-3wbl663mrnsi7fvdrqbyw7hizlspzgkj-source/modules/home/desktop/bars/way…
┃             1| {
┃              | ^
┃             2|   config,
┣━━━                                                            
┗━ ∑ ⚠ Exited with 1 errors reported by nix at 08:22:53 after 0s
Error: 
   0: Command exited with status Exited(1)

Location:
   src/commands.rs:151

[jameslounds]

I've had a quick look at your nix-tmp repo, I think if you change your osConfig arguments to osConfig ? {}s (using an empty attest as the default argument), standalone should work - it works for my config at least.

Regarding the issue itself, I know home-manager switch accepts --options NAME VALUE, so maybe the nixos configuration could include a shell script which wraps home-manager switch to include certain values in an attrset at say config.${namespace}.osConfig using --option. No idea if this will work

For example in the nixosConfiguration somewhere

environment.systemPackages = [
  pkgs.writeShellScriptBin "hm-switch" ''
    home-manager switch --flake <path_to_your_flake> \ 
     --option ${namespace}.osConfig.services.myService.enable ${config.${namespace}.services.myService.enable}
     # and so on
  '';
];