file location adjustments

disko may not be required here depending on the fact we are leveraging
lxc containers

modules/nixos/common/otf.nix

@@ -0,0 +1,91 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.services.otf;
+in
+{
+  options.services.otf = {
+    enable = lib.mkEnableOption "Open Terraform Framework";
+    # It is important to expose the datadirectory to the user so we make it a reusable option
+    dataDir = lib.mkOption {
+      type = lib.types.str;
+      default = "/var/lib/otf";
+      description = "Directory to store OTF data.";
+    };
+    package = lib.mkPackageOption pkgs "otf" { };
+    pgPackage = lib.mkPackageOption pkgs "postgresql_16" { };
+    # this application is configured entirely by environment variables and needs to be exposed
+    environment = lib.mkOption {
+      type =
+        with lib.types;
+        attrsOf (
+          nullOr (oneOf [
+            str
+            path
+            package
+          ])
+        );
+      default = {
+        OTF_ADDRESS = "localhost:9000";
+        OTF_SITE_TOKEN = "my-token";
+        OTF_SSL = "false";
+        # the application needs a secret for encryption and other things
+        # TODO: make mechanism to load via file
+        OTF_SECRET = "f73e55eada59bd1c37d69ae3bbacd982";
+        # more options can be set but these are a reminder for myself
+        OTF_CERT_FILE = "";
+        OTF_KEY_FILE = "";
+      };
+      description = "Environment variables for the OTF service.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    # it is best for this project to have a dedicated user for database access
+    users.groups.otf = { };
+    users.users.otf = {
+      isSystemUser = true;
+      home = cfg.dataDir;
+      createHome = true;
+      group = "otf";
+    };
+
+    services.postgresql = {
+      enable = true;
+      # this lets us set the package
+      # TODO: expose to end user
+      package = cfg.pgPackage;
+      # This enabled autoconfig of both a database and a user of the same name
+      ensureDatabases = [ "otf" ];
+      ensureUsers = [
+        {
+          name = "otf";
+          ensureDBOwnership = true;
+        }
+      ];
+    };
+
+    systemd.services.otf = {
+      description = "Open Terraform Framework";
+      after = [
+        "network.target"
+        "postgresql.service"
+      ];
+      requires = [ "postgresql.service" ];
+      wantedBy = [ "multi-user.target" ];
+      inherit (cfg) environment;
+      serviceConfig = {
+        User = "otf";
+        Group = "otf";
+        WorkingDirectory = cfg.dataDir;
+        ExecStart = "${cfg.package}/bin/otfd";
+        Restart = "on-failure";
+      };
+    };
+  };
+}