OpamFile.File_attributestype t = OpamTypes.file_attribute_setFile contents
val empty : tEmpty file
val write : OpamTypes.filename -> t -> unitWrite some contents to a file
val read : OpamTypes.filename -> tRead file contents. Raise an error if the file does not exist.
val safe_read : OpamTypes.filename -> tRead file contents. Return empty if the file does not exist.
val read_from_channel : ?filename:OpamTypes.filename -> in_channel -> tRead from channel.
val read_from_string : ?filename:OpamTypes.filename -> string -> tval write_to_channel : out_channel -> t -> unitWrite to channel.