···

       
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You may make any other changes to your VM in this attribute set. For example,

     

       
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you could enable Docker or X11 forwarding to your Darwin host.

     

       
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+
       
## Troubleshooting the generated configuration {#sec-darwin-builder-troubleshoot}

     

       
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+
       


     

       
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+
       
The `linux-builder` package exposes the attributes `nixosConfig` and `nixosOptions` that allow you to inspect the generated NixOS configuration in the `nix repl`. For example:

     

       
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163
       
+
       


     

       
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+
       
```

     

       
165
       
165
       
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$ nix repl --file ~/src/nixpkgs --argstr system aarch64-darwin

     

       
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166
       
+
       


     

       
167
       
167
       
+
       
nix-repl> darwin.linux-builder.nixosConfig.nix.package

     

       
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168
       
+
       
«derivation /nix/store/...-nix-2.17.0.drv»

     

       
169
       
169
       
+
       


     

       
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nix-repl> :p darwin.linux-builder.nixosOptions.virtualisation.memorySize.definitionsWithLocations

     

       
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[ { file = "/home/user/src/nixpkgs/nixos/modules/profiles/macos-builder.nix"; value = 3072; } ]

     

       
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172
       
+
       


     

       
173
       
173
       
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```

     

···

       
1
       
1
       
-
       
{ config, lib, ... }:

     

       
1
       
1
       
+
       
{ config, lib, options, ... }:

     

       
2
       
2
       
 
       


     

       
3
       
3
       
 
       
let

     

       
4
       
4
       
 
       
  keysDirectory = "/var/keys";

     
···

       
163
       
163
       
 
       


     

       
164
       
164
       
 
       
      in

     

       
165
       
165
       
 
       
      script.overrideAttrs (old: {

     

       
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+
       
        pos = __curPos; # sets meta.position to point here; see script binding above for package definition

     

       
166
       
167
       
 
       
        meta = (old.meta or { }) // {

     

       
167
       
168
       
 
       
          platforms = lib.platforms.darwin;

     

       
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169
       
+
       
        };

     

       
170
       
170
       
+
       
        passthru = (old.passthru or { }) // {

     

       
171
       
171
       
+
       
          # Let users in the repl inspect the config

     

       
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172
       
+
       
          nixosConfig = config;

     

       
173
       
173
       
+
       
          nixosOptions = options;

     

       
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174
       
 
       
        };

     

       
169
       
175
       
 
       
      });

     

       
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176