anchor.diff:  
     baseService = recursiveUpdate commonEnv {
       wants = [ "ipfs-init.service" ];
  +    # NB: migration must be performed prior to pre-start, else we get the failure message!
       preStart = ''
         ipfs repo fsck # workaround for BUG #4212 (https://github.com/ipfs/go-ipfs/issues/4214)
         ipfs --local config Addresses.API ${cfg.apiAddress}
  
positive.code:         description = "systemd service that is enabled by default";
        };
  
        autoMigrate = mkOption {
          type = types.bool;
          default = false;
          description = "Whether IPFS should try to migrate the file system automatically";
        };
  
        autoMount = mkOption {
          type = types.bool;
  
negative.code: 
    ipfsFlags = toString ([
      (optionalString  cfg.autoMount                   "--mount")
      #(optionalString  cfg.autoMigrate                 "--migrate")
      (optionalString  cfg.enableGC                    "--enable-gc")
      (optionalString (cfg.serviceFdlimit != null)     "--manage-fdlimit=false")
      (optionalString (cfg.defaultMode == "offline")   "--offline")
  