Function extractTar

kitectl/command/install.go:189–238

extractTar reads from the io.Reader and writes the files into the directory.

(r io.Reader, dir string)

// extractTar reads from the io.Reader and writes the files into the directory.
func extractTar(r io.Reader, dir string) error {
	first := true // true if we are on the first entry of tarball
	tr := tar.NewReader(r)
	for {
		hdr, err := tr.Next()
		if err == io.EOF {
			// end of tar archive
			break
		}
		if err != nil {
			return err
		}

		// Check if the same kite version is installed before
		if first {
			first = false
			kiteName := strings.TrimSuffix(hdr.Name, ".kite/")

			installed, err := isInstalled(kiteName)
			if err != nil {
				return err
			}

			if installed {
				return fmt.Errorf("Already installed: %s", kiteName)
			}
		}

		path := filepath.Join(dir, hdr.Name)

		if hdr.FileInfo().IsDir() {
			os.MkdirAll(path, 0700)
		} else {
			mode := 0600
			if isBinaryFile(hdr.Name) {
				mode = 0700
			}

			f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(mode))
			if err != nil {
				return err
			}

			if _, err := io.Copy(f, tr); err != nil {
				return err
			}
		}
	}
	return nil
}

// validatePackage does some checks on kite bundle and returns the bundle path.
func validatePackage(tempKitePath, repoName string) (bundlePath string, err error) {