Function mountBind

src/cmd/initContainer.go:995–1045

(containerPath, source, flags string)

}

func mountBind(containerPath, source, flags string) error {
	fi, err := os.Stat(source)
	if err != nil {
		if os.IsNotExist(err) {
			return nil
		}

		return fmt.Errorf("failed to stat %s", source)
	}

	fileMode := fi.Mode()

	if fileMode.IsDir() {
		logrus.Debugf("Creating directory %s", containerPath)
		if err := os.MkdirAll(containerPath, 0755); err != nil {
			return fmt.Errorf("failed to create directory %s: %w", containerPath, err)
		}
	} else if fileMode.IsRegular() || fileMode&os.ModeSocket != 0 {
		logrus.Debugf("Creating regular file %s", containerPath)

		containerPathDir := filepath.Dir(containerPath)
		if err := os.MkdirAll(containerPathDir, 0755); err != nil {
			return fmt.Errorf("failed to create directory %s: %w", containerPathDir, err)
		}

		containerPathFile, err := os.Create(containerPath)
		if err != nil && !os.IsExist(err) {
			return fmt.Errorf("failed to create regular file %s: %w", containerPath, err)
		}

		defer containerPathFile.Close()
	}

	logrus.Debugf("Binding %s to %s", containerPath, source)

	args := []string{
		"--rbind",
	}

	if flags != "" {
		args = append(args, []string{"-o", flags}...)
	}

	args = append(args, []string{source, containerPath}...)

	if err := shell.Run("mount", nil, nil, nil, args...); err != nil {
		return fmt.Errorf("failed to bind %s to %s", containerPath, source)
	}

	return nil
}

// redirectPath serves for creating symbolic links for crucial system
// configuration files to their counterparts on the host's file system.