Download saves URL as bytes in memory, verifying a SHA256 hash.

ExtractTar extracts a tar file from r into destinationDir.

FormatHashes returns a string value of hashes to be copy/pasted into code.

GetPlatform returns the current platform from runtime.GOOS and runtime.GOARCH.

NewPackageFetcher creates a new fetcher that uses the provided urlTemplate.

NilLogFunc does not log anything.

AMD64 is the amd64 GOARCH value.

ARM64 is the arm64 GOARCH value.

DARWIN is the darwin GOOS value.

LINUX is the linux GOOS value.

PackageFetcher downloads packages for a specific host platform.

Platform represents the host platform as returned by Go, for use as a map key.

URLHostPlatform represents the host platform for rendering a URL template.

LogFunc defines a function for verbose logging.