def self.readlink(link_name)
raise Errno::ENOENT, link_name unless ::File.exists?(link_name)
symlink_file_handle(link_name) do |handle|
reparse_buffer = FFI::MemoryPointer.new(MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
parsed_size = FFI::Buffer.new(:long).write_long(0)
if DeviceIoControl(handle, FSCTL_GET_REPARSE_POINT, nil, 0, reparse_buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE, parsed_size, nil) == 0
Chef::ReservedNames::Win32::Error.raise!
end
reparse_buffer = REPARSE_DATA_BUFFER.new(reparse_buffer)
if reparse_buffer[:ReparseTag] != IO_REPARSE_TAG_SYMLINK
raise Errno::EACCES, "#{link_name} is not a symlink"
end
link_dest = reparse_buffer.reparse_buffer.substitute_name
if link_dest =~ /^\\\?\?\\/
link_dest = link_dest[4..-1]
end
link_dest
end
end