1 files changed, 99 insertions, 0 deletions

diff --git a/custom/bar-service.nix b/custom/bar-service.nix
new file mode 100644
index 00000000..2a492ce1
--- /dev/null
+++ b/custom/bar-service.nix
@@ -0,0 +1,99 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.bar;
+in {
+  options.services.bar = {
+    enable = mkEnableOption "the Bar Inventory System";
+
+    user = mkOption {
+      type = types.str;
+      default = "bar";
+      description = "User to execute the daemon under";
+    };
+
+    group = mkOption {
+      type = types.str;
+      default = "bar";
+      description = "Group to execute the daemon under";
+    };
+
+    stateDir = mkOption {
+      type = types.path;
+      default = "/var/lib/bar";
+      description = "Directory for the daemon to store semi-transient state (encryption keys etc.)";
+    };
+
+    port = mkOption {
+      type = types.int;
+      default = 8080;
+      description = "Port for the daemon to listen on";
+    };
+
+    host = mkOption {
+      type = types.str;
+      default = "localhost";
+      description = "Host to bind to";
+    };
+
+    approot = mkOption {
+      type = types.str;
+      default = "/";
+      description = "Subdirectory of the daemon-managed site relative to HTTP /; only useful when using a reverse proxy";
+    };
+
+    thermoprintBaseURL = mkOption {
+      type = with types; nullOr types.str;
+      default = null;
+      example = "http://localhost:80/thermoprint/api";
+      description = "Thermoprint base url";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [
+      { assertion = config.services.postgresql.enable;
+        message = "bar requires PostgreSQL";
+      }
+    ];
+
+    users.users."${cfg.user}" = {
+      group = cfg.group;
+      description = "User for the Bar Inventory System";
+      isSystemUser = true;
+      home = cfg.stateDir;
+      createHome = true;
+    };
+
+    users.groups."${cfg.group}" = {};
+
+    nixpkgs.overlays = [(self: super: {
+      bar = self.callPackage ./bar { inherit (self) haskellPackages; };
+    })];
+
+    systemd.services."bar" = {
+      environment = {
+        PORT = cfg.port;
+        HOST = cfg.host;
+        APPROOT = cfg.approot;
+        IP_FROM_HEADER = cfg.ipFromHeader;
+        TPRINT_BASEURL = mkIf (cfg.thermoprintBaseURL != null) cfg.thermoprintBaseURL;
+      };
+
+      bindsTo = [ "postgresql.service" ];
+      after = [ "postgresql.service" ];
+      wantedBy = [ "default.target" ];
+
+      serviceConfig = {
+        Type = "notify";
+        User = cfg.user;
+        Group = cfg.group;
+        WorkingDirectory = cfg.stateDir;
+
+        ExecStart = with pkgs; "${bar}/bin/bar";
+      };
+    };
+  };
+}