Init project demos

[eljamm]

To test this, you can run:

$ nix-build . -A demo-test
$ ./result

Closes #696

[erictapen]

Nice! The examples don't work yet though, as they lack their module?

$ nix run .#project-demos.Keyoxide/keyoxide-web
error:
       … while evaluating the attribute 'config.system.build.vm'
         at /nix/store/crrwsv142k1vkwdba7q26y73760n4bll-source/lib/modules.nix:336:9:
          335|         options = checked options;
          336|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          337|         _module = checked (config._module);

       … while calling the 'seq' builtin
         at /nix/store/crrwsv142k1vkwdba7q26y73760n4bll-source/lib/modules.nix:336:18:
          335|         options = checked options;
          336|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          337|         _module = checked (config._module);

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

       error: The option `services.keyoxide' does not exist. Definition values:
       - In `/nix/store/y54pzyxbd1bdf8i4pzg1yvq0q7q0jl24-source/projects/Keyoxide/keyoxide-web/example.nix':
           {
             enable = true;
           }

[eljamm]

Yeah, let's just keep importing all the modules for now. The example in the description is probably not the best either. I'll change that in a second.

[eljamm]

One thing I'm thinking about is that we could probably make 2 types of VMs depending on what the example needs:

• Graphical with GPU acceleration (OpenGL or Vulkan)
• Minimal CLI only

Or we could run everything in a graphical VM and have the experience be close to what it feels like using NixOS as a users.

[erictapen]

Yeah I was thinking about how much customisation each demo VM might need. My tendency would be to keep stuff as minimalistic as possible, e.g. a service that mostly provides a web interface should not boot a display manager.

[fricklerhandwerk]

Yes, another heuristic is to look at the intended use case, one of which is self hosting web services -- we don't need a GUI there.

[eljamm]

Fully contained Cryptpad demo, with ssh and service ports forwarded to the host:

# default.nix
{
  ngipkgs ?
    import
      (fetchTarball "https://github.com/eljamm/ngipkgs/tarball/init-project-demos/8eb7f038fd62fd6490e017d78e6a30e7b64a13fa")
      { },
}:
let
  servicePort = 9000;
  domainName = "localhost:${toString servicePort}";
in
ngipkgs.demo {
  services.cryptpad = {
    enable = true;
    settings = {
      httpPort = servicePort;
      httpAddress = "0.0.0.0";
      httpUnsafeOrigin = "http://${domainName}";
      httpSafeOrigin = "http://${domainName}";
    };
  };

  networking.firewall.allowedTCPPorts = [ servicePort ];
  networking.firewall.allowedUDPPorts = [ servicePort ];
}

$ nix-build
$ ./resullt