nixos/calibre-web: customize data directory (#350617)

nixos/modules/services/web-apps/calibre-web.nix

@@ -32,9 +32,9 @@ in
 
       dataDir = mkOption {
         type = types.str;
-        default = "calibre-web";
+        default = "/var/lib/calibre-web";
         description = ''
-          The directory below {file}`/var/lib` where Calibre-Web stores its data.
+          The directory where Calibre-Web stores its data.
         '';
       };
 
@@ -107,9 +107,14 @@ in
   };
 
   config = mkIf cfg.enable {
+    systemd.tmpfiles.settings."10-calibre-web".${cfg.dataDir}.d = {
+      inherit (cfg) user group;
+      mode = "0700";
+    };
+
     systemd.services.calibre-web = let
-      appDb = "/var/lib/${cfg.dataDir}/app.db";
-      gdriveDb = "/var/lib/${cfg.dataDir}/gdrive.db";
+      appDb = "${cfg.dataDir}/app.db";
+      gdriveDb = "${cfg.dataDir}/gdrive.db";
       calibreWebCmd = "${cfg.package}/bin/calibre-web -p ${appDb} -g ${gdriveDb}";
 
       settings = concatStringsSep ", " (
@@ -134,7 +139,6 @@ in
           User = cfg.user;
           Group = cfg.group;
 
-          StateDirectory = cfg.dataDir;
           ExecStartPre = pkgs.writeShellScript "calibre-web-pre-start" (
             ''
               __RUN_MIGRATIONS_AND_EXIT=1 ${calibreWebCmd}