nixos/vsftpd: allocate group; fix fallout of #133166

nixos/modules/misc/ids.nix

@@ -46,7 +46,7 @@ in
       messagebus = 4; # D-Bus
       haldaemon = 5;
       #disk = 6; # unused
-      vsftpd = 7;
+      #vsftpd = 7; # dynamically allocated ass of 2021-09-14
       ftp = 8;
       bitlbee = 9;
       #avahi = 10; # removed 2019-05-22
@@ -366,7 +366,7 @@ in
       messagebus = 4; # D-Bus
       haldaemon = 5;
       disk = 6;
-      vsftpd = 7;
+      #vsftpd = 7; # dynamically allocated as of 2021-09-14
       ftp = 8;
       bitlbee = 9;
       #avahi = 10; # removed 2019-05-22

nixos/modules/services/networking/vsftpd.nix

@@ -282,7 +282,8 @@ in
 
     users.users = {
       "vsftpd" = {
-        uid = config.ids.uids.vsftpd;
+        group = "vsftpd";
+        isSystemUser = true;
         description = "VSFTPD user";
         home = if cfg.localRoot != null
                then cfg.localRoot # <= Necessary for virtual users.
@@ -297,6 +298,7 @@ in
         };
     };
 
+    users.groups.vsftpd = {};
     users.groups.ftp.gid = config.ids.gids.ftp;
 
     # If you really have to access root via FTP use mkOverride or userlistDeny