type op_t =
    | OpSetupSession
    | OpExists
    | OpTeardownSession
    | OpShowConfig
    | OpValidate
    | OpReloadReftree

val session_init : ?out_format:string -> ?config_format:string -> string -> (string, string) result

val session_free : string -> string -> (string, string) result

val session_validate_path : string -> string -> string list -> (string, string) result

val session_show_config : string -> string -> string list -> (string, string) result

val session_path_exists : string -> string -> string list -> (string, string) result

val reload_reference_tree : string -> (string, string) result