WIP

clanServices/yggdrasil/default.nix

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+# Example clan service. See https://docs.clan.lol/guides/services/community/
+# for more details
+
+# The test for this module in ./tests/vm/default.nix shows an example of how
+# the service is used.
+
+{ packages }:
+{ ... }:
+{
+  _class = "clan.service";
+  manifest.name = "clan-core/yggdrasil";
+  manifest.description = "Yggdrasil VPN";
+
+  roles.default = {
+    # interface =
+    #   { lib, ... }:
+    #   {
+    #     # Here we define the settings for this role. They will be accessible
+    #     # via `roles.morning.settings` in the role
+    #
+    #     options.greeting = lib.mkOption {
+    #       type = lib.types.str;
+    #       default = "Good morning";
+    #       description = "The greeting to use";
+    #     };
+    #   };
+    # Maps over all instances and produces one result per instance.
+    perInstance =
+      {
+        # Role settings for this machine/instance
+        settings,
+
+        # The name of this instance of the service
+        instanceName,
+
+        # The current machine
+        machine,
+
+        # All roles of this service, with their assigned machines
+        roles,
+        ...
+      }:
+      {
+        # Analog to 'perSystem' of flake-parts.
+        # For every instance of this service we will add a nixosModule to a morning-machine
+        nixosModule =
+          { config, pkgs, ... }:
+          {
+
+            clan.core.vars.generators.yggdrasil = {
+
+              files.privateKey = { };
+
+              runtimeInputs = with pkgs; [
+                yggdrasil
+                jq
+              ];
+
+              script = ''
+                yggdrasil -genconf -json | jq 'to_entries|map(select(.key|endswith("Key")))|from_entries' > $out/privateKey
+              '';
+            };
+
+            services.yggdrasil = {
+              persistentKeys = true;
+              enable = true;
+            };
+
+            systemd.services.yggdrasil.serviceConfig.BindReadOnlyPaths = [
+              "${config.clan.core.vars.generators.yggdrasil.files.privateKey.path}:/var/lib/yggdrasil/keys.json"
+            ];
+
+            # Interaction examples what you could do here:
+            # - Get some settings of this machine
+            # settings.ipRanges
+            #
+            # - Get all evening names:
+            # allEveningNames = lib.attrNames roles.evening.machines
+            #
+            # - Get all roles of the machine:
+            # machine.roles
+            #
+            # - Get the settings that where applied to a specific evening machine:
+            # roles.evening.machines.peer1.settings
+            # environment.etc.hello.text = "${settings.greeting} World!";
+          };
+      };
+  };
+
+  # This part gets applied to all machines, regardless of their role.
+  # perMachine =
+    # { machine, ... }:
+    # {
+      # nixosModule =
+      #   { pkgs, ... }:
+      #   {
+      #     environment.systemPackages = [
+      #       (pkgs.writeShellScriptBin "greet-world" ''
+      #         #!${pkgs.bash}/bin/bash
+      #         set -euo pipefail
+      #
+      #         cat /etc/hello
+      #         echo " I'm ${machine.name}"
+      #       '')
+      #     ];
+      #   };
+    # };
+}

clanServices/yggdrasil/flake-module.nix

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+{
+  self,
+  inputs,
+  lib,
+  ...
+}:
+let
+  module = lib.modules.importApply ./default.nix {
+    inherit (self) packages;
+  };
+in
+{
+  clan.modules = {
+    yggdrasil = module;
+  };
+  perSystem =
+    { ... }:
+    {
+      clan.nixosTests.yggdrasil = {
+        imports = [ ./tests/vm/default.nix ];
+
+        clan.modules.yggdrasil = module;
+      };
+    };
+}

clanServices/yggdrasil/tests/vm/default.nix

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+{
+  name = "yggdrasil";
+
+  clan = {
+    directory = ./.;
+    inventory = {
+
+      machines.peer1 = { };
+
+      # machines.peer2 = { };
+
+      instances."yggdrasil" = {
+        module.name = "yggdrasil";
+        module.input = "self";
+
+        # Assign the roles to the two machines
+        roles.default.machines.peer1 = { };
+
+        # roles.evening.machines.peer2 = {
+        #   # Set roles settings for the peers, where we want to differ from
+        #   # the role defaults
+        #   settings = {
+        #     greeting = "Good night";
+        #   };
+        # };
+      };
+    };
+  };
+
+  testScript =
+    { ... }:
+    ''
+      start_all()
+
+      # value = peer1.succeed("greet-world")
+      # assert value.strip() == "Good morning World! I'm peer1", value
+      #
+      # value = peer2.succeed("greet-world")
+      # assert value.strip() == "Good night World! I'm peer2", value
+    '';
+}

clanServices/yggdrasil/tests/vm/sops/users/admin/key.json

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+{
+  "publickey": "age1qm0p4vf9jvcnn43s6l4prk8zn6cx0ep9gzvevxecv729xz540v8qa742eg",
+  "type": "age"
+}