INNER CODE UNIT · Go

contextFromStdin

genuinetools/img · build.go:401

func contextFromStdin(dockerfileName string) (string, error) {
	// Set the dockerfile name if it is empty.
	if dockerfileName == "" {
		dockerfileName = defaultDockerfileName
	}

	// Create a temporary directory for the build context.
	tmpDir, err := ioutil.TempDir("", "img-build-context-")
	if err != nil {
		return "", fmt.Errorf("unable to create temporary context directory: %v", err)
	}

	// Create a new reader from stdin.
	buf := bufio.NewReader(os.Stdin)

	// Grab the magic number range from the reader.
	archiveHeaderSize := 512 // number of bytes in an archive header
	magic, err := buf.Peek(archiveHeaderSize)

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