DownloadImage is a helper function to wrap library image download operation.

DownloadImageNoProgress downloads an image from the library without displaying a progress bar while doing so.

NormalizeLibraryRef parses library ref and sets default tag, if necessary.

Pull will pull a library image to the cache or direct to a temporary file if cache is disabled.

PullToFile will pull a library image to the specified location, through the cache, or directly if cache is disabled.

SearchLibrary searches the library and outputs results to stdout.

ErrLibraryPullUnsigned indicates that the interactive portion of the pull was aborted.