AddImageNames adds the specified names to the specified image.

ExpandNames takes unqualified names, parses them as image names, and returns the fully expanded result, including a tag.

FindImage locates the locally-stored image which corresponds to a given name.

GetFailureCause checks the type of the error "err" and returns a new error message that reflects the reason of the failure.

ResolveName checks if name is a valid image name, and if that name doesn't include a domain portion, returns a list of the names which it might correspond to in the registries.

RegistryDefaultPathPrefix contains a per-registry listing of default prefixes to prepend to image names that only contain a single path component.