BUG: nixpkgs.hostPlatform is missing.

[Svenum]

I updated my flake, after that I got this error:

error:                                                                                                                                                                                                   
       … while evaluating the attribute 'Yon.config.nixpkgs'                                                                                                                                             
         at /nix/store/irknf7niks2djxz4csh7sr44wwrs082y-source/lib/modules.nix:334:9:                                                                                                                    
          333|         options = checked options;                                                                                                                                                        
          334|         config = checked (removeAttrs config [ "_module" ]);                                                                                                                              
             |         ^                                                                                                                                                                                 
          335|         _module = checked (config._module);                                                                                                                                               
                                                                                                                                                                                                         
       … while calling the 'seq' builtin                                                                                                                                                                 
         at /nix/store/irknf7niks2djxz4csh7sr44wwrs082y-source/lib/modules.nix:334:18:                                                                                                                   
          333|         options = checked options;                                                                                                                                                        
          334|         config = checked (removeAttrs config [ "_module" ]);                                                                                                                              
             |                  ^                                                                                                                                                                        
          335|         _module = checked (config._module);                                                                                                                                               
                                                                                                                                                                                                         
       … while evaluating the option `_module.check':                                                                                                                                                    
                                                                                                                                                                                                         
       … while evaluating definitions from `/nix/store/irknf7niks2djxz4csh7sr44wwrs082y-source/nixos/modules/rename.nix':                                                                                
                                                                                                                                                                                                         
       … while evaluating the module argument `pkgs' in "/nix/store/irknf7niks2djxz4csh7sr44wwrs082y-source/nixos/modules/programs/pay-respects.nix":                                                    
                                                                                                                                                                                                         
       … while evaluating definitions from `/nix/store/irknf7niks2djxz4csh7sr44wwrs082y-source/flake.nix':                                                                                               
                                                                                                                                                                                                         
       … while evaluating the option `_module.check':                                                                                                                                                    
                                                                                                                                                                                                         
       … while evaluating definitions from `/nix/store/irknf7niks2djxz4csh7sr44wwrs082y-source/nixos/modules/rename.nix':                                                                                
                                                                                                                                                                                                         
       … while evaluating the module argument `pkgs' in "/nix/store/irknf7niks2djxz4csh7sr44wwrs082y-source/nixos/modules/programs/pay-respects.nix":                                                    
                                                                                                                                                                                                         
       … while evaluating the option `nixpkgs.localSystem':                                                                                                                                              
                                                                                                                                                                                                         
       … while evaluating the option `nixpkgs.system':                                                                                                                                                   
                                                                                                                                                                                                         
       (stack trace truncated; use '--show-trace' to show the full, detailed trace)                                                                                                                      
                                                                                                                                                                                                         
       error: Neither nixpkgs.hostPlatform nor the legacy option nixpkgs.system has been set.                                                                                                            
       You can set nixpkgs.hostPlatform in hardware-configuration.nix by re-running                                                                                                                      
       a recent version of nixos-generate-config.                                                                                                                                                        
       The option nixpkgs.system is still fully supported for NixOS 22.05 interoperability,                                                                                                              
       but will be deprecated in the future, so we recommend to set nixpkgs.hostPlatform.

After adding:

nixpkgs..hostPlatform = lib.mkDefault "x86_64-linux";

to my system, everything worked again.
Maybe this could be automatically set by this lib.

[olifloof]

hm, weird, it should already set it automatically

[Svenum]

I thought too, but after updating it does not anymore.

[stratosgear]

Here for the same reason! :(

I already have:

nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";

defined in my hardware-configuration.nix that is already properly imported from my default.nix in my [hostname] system folder.

Has been working fine, the last year or so.

Sorry unable to debug this any further on my own... :(

[olifloof]

hm, weird, it should already set it automatically

looking at my config, i do have it set manually

[wasv]

Looks like this is likely unrelated to snowfall. A PR was recently merged to nixpkgs-unstable that broke evaluation for all flakes. NixOS/nixpkgs#376453
Personally I'm going to switch to the latest stable branch for the time being.