$ rugged initialize-partial-root-metadata-for-update --help
Usage: rugged initialize-partial-root-metadata-for-update [OPTIONS]
Initialize a new partial Root metadata file from production Root metadata.
Options:
--help Show this message and exit.
$ rugged initialize-partial-root-metadata-for-update
Initializing partial root metadata for update at: /var/rugged/tuf_repo/partial/2.root.json