Adds name with permissions mode to the tar, yielding io for writing the file. The signer is used to add a digest file using its digest_algorithm per add_file_digest and a cryptographic signature in name.sig. If the signer has no key only the checksum file is added.
Returns the digest.
Looks up the latest specification for dependency and adds it to the always_install list.
true if server advertises AUTH CRAM-MD5. You cannot get valid value before opening SMTP session.
Get a single gem name from the command line. Fail if there is no gem name or if there is more than one gem name given.
Invoke the command with the given list of normal arguments and additional build arguments.
Adds a section with title and content to the parser help view. Used for adding command arguments and default arguments.