migrate to flake

default.nix

@@ -1,22 +0,0 @@
-{ pkgs ? import <nixpkgs> {}
-}:
-
-let
-  inherit (pkgs) python3;
-in
-
-python3.pkgs.buildPythonApplication rec {
-  pname = "dogetipbot-telegram";
-  version = "1.1-2";
-
-  src = ./.;
-
-  doCheck = false;
-
-  propagatedBuildInputs = with python3.pkgs; [
-    python-telegram-bot
-    requests
-    pycoin
-    sqlalchemy
-  ];
-}

flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1627805549,
+        "narHash": "sha256-+LHhcpzw6vAxF6q0VSLkZSEGpDC02JN21KM8eUWz+is=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "16bf3980bfa0d8929639be93fa8491ebad9d61ec",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-21.05",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,52 @@
+{
+  description = "A dogecoin Telegram tip bot";
+
+  inputs.nixpkgs.url = "nixpkgs/nixos-21.05";
+
+  outputs = { self, nixpkgs }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system}.python3.pkgs;
+    packageName = "dogetipbot-telegram";
+    app = pkgs.buildPythonApplication rec {
+      pname = packageName;
+
+      version = builtins.substring 0 8 self.lastModifiedDate;
+
+      src = ./.;
+
+      doCheck = false;
+
+      propagatedBuildInputs = with pkgs; [
+        python-telegram-bot
+        requests
+        pycoin
+        sqlalchemy
+      ];
+    };
+    module = ({ config, lib, pkgs, ... }: let
+      cfg = config.${packageName};
+    in {
+      options.${packageName} = with lib.options; {
+        enable = mkEnableOption packageName;
+      };
+
+      config = lib.mkIf cfg.enable {
+        systemd.services.dogetipbot-telegram = {
+          after = [ "network.target" ];
+          wantedBy = [ "multi-user.target" ];
+          script = "${app}/bin/dogetipbot-telegram --db-path $STATE_DIRECTORY/users.db";
+          enable = true;
+          serviceConfig = {
+            EnvironmentFile = "/mnt/secrets/dogetipbot-telegram_env";
+            DynamicUser = true;
+            StateDirectory = "dogetipbot";
+          };
+        };
+      };
+    });
+  in {
+    defaultPackage.${system} = app;
+    nixosModules.${packageName} = module;
+    nixosModule = self.nixosModules.${packageName};
+  };
+}