Adds name with permissions mode to the tar, yielding io for writing the file. The digest_algorithm is written to a read-only name.sum file following the given file contents containing the digest name and hexdigest separated by a tab.
The created digest object is returned.
Pins the gem name to the given source. Adding a gem with the same name from a different source will raise an exception.
The node ‘node` has empty string or string
Check is passed argument valid ‘nz_number’ in RFC 3501 terminology
Ensure argument is ‘nz_number’ or raise DataFormatError