feat(pharos): add Pharos service configuration and module

Author: monyarm

modules/default.nix

@@ -7,5 +7,6 @@
     ./random-alerts
     ./host-info.nix
     ./secrets.nix
+    ./pharos
   ];
 }

modules/pharos/default.nix

@@ -0,0 +1,53 @@
+{ ... }:
+{
+  flake.modules.nixos.pharos =
+    {
+      config,
+      lib,
+      ...
+    }:
+    let
+      cfg = config.services.pharos;
+    in
+    {
+      options.services.pharos = with lib; {
+        enable = mkEnableOption (lib.mdDoc "Pharos");
+        network = mkOption {
+          type = types.enum [
+            "testnet"
+            "devnet"
+            "mainnet"
+          ];
+          default = "testnet";
+          description = "Network to connect to";
+        };
+      };
+      config = {
+        virtualisation.oci-containers.containers."pharos-${cfg.network}" = {
+          image =
+            {
+              "testnet" = "public.ecr.aws/k2g7b7g1/pharos/testnet:63b85b6b";
+              "devnet" = "public.ecr.aws/k2g7b7g1/pharos:latest";
+            }
+            ."${cfg.testnet}";
+          volumes = [
+            "/var/lib/pharos-${cfg.network}:/data"
+          ];
+          ports = [
+            "18100:18100"
+            "18200:18200"
+            "19000:19000"
+          ];
+        };
+        assertions = [
+          {
+            assertion = cfg.network != "mainnet";
+            message = "Pharos is not available on mainnet yet";
+          }
+        ];
+        system.activationScripts."pharos-${cfg.network}" = ''
+          mkdir -p /var/lib/pharos-${cfg.network}
+        '';
+      };
+    };
+}