Function parseCpFileSpec

cmd/nerdctl/container/container_cp_linux.go:136–172

(arg string)

var errFileSpecDoesntMatchFormat = errors.New("filespec must match the canonical format: [container:]file/path")

func parseCpFileSpec(arg string) (*copyFileSpec, error) {
	if arg == "" {
		return &copyFileSpec{
			Path: "-",
		}, nil
	}

	i := strings.Index(arg, ":")

	// filespec starting with a semicolon is invalid
	if i == 0 {
		return nil, errFileSpecDoesntMatchFormat
	}

	if filepath.IsAbs(arg) {
		// Explicit local absolute path, e.g., `C:\foo` or `/foo`.
		return &copyFileSpec{
			Container: nil,
			Path:      arg,
		}, nil
	}

	parts := strings.SplitN(arg, ":", 2)

	if len(parts) == 1 || strings.HasPrefix(parts[0], ".") {
		// Either there's no `:` in the arg
		// OR it's an explicit local relative path like `./file:name.txt`.
		return &copyFileSpec{
			Path: arg,
		}, nil
	}

	return &copyFileSpec{
		Container: &parts[0],
		Path:      parts[1],
	}, nil
}

type copyFileSpec struct {
	Container *string