NewDownloader builds a new Downloader.

NewFileFetcher returns a local file reader.

NewSha256Verifier creates a Verifier that tests against the given hash.

Downloader is responsible for fetching, verifying and extracting a binary.

HTTPFetcher is used to get a file from a http:// or https:// schema path.

Fetcher is used to get files from a URI.

Verifier can check a reader against it's correctness.