Ejemplo n.º 1
0
// New initializes a new engine managing the directory specified at `root`.
// `root` is used to store containers and any other state private to the engine.
// Changing the contents of the root without executing a job will cause unspecified
// behavior.
func New(root string) (*Engine, error) {
	// Check for unsupported architectures
	if runtime.GOARCH != "amd64" && runtime.GOARCH != "386" {
		return nil, fmt.Errorf("The docker runtime currently only supports amd64 and 386 (not %s). This will change in the future. Aborting.", runtime.GOARCH)
	}
	// Check for unsupported kernel versions
	// FIXME: it would be cleaner to not test for specific versions, but rather
	// test for specific functionalities.
	// Unfortunately we can't test for the feature "does not cause a kernel panic"
	// without actually causing a kernel panic, so we need this workaround until
	// the circumstances of pre-3.8 crashes are clearer.
	// For details see http://github.com/Nerdness/docker/issues/407
	if k, err := utils.GetKernelVersion(); err != nil {
		log.Printf("WARNING: %s\n", err)
	} else {
		if utils.CompareKernelVersion(k, &utils.KernelVersionInfo{Kernel: 3, Major: 8, Minor: 0}) < 0 {
			if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" {
				log.Printf("WARNING: You are running linux kernel version %s, which might be unstable running docker. Please upgrade your kernel to 3.8.0.", k.String())
			}
		}
	}

	if err := os.MkdirAll(root, 0700); err != nil && !os.IsExist(err) {
		return nil, err
	}

	// Docker makes some assumptions about the "absoluteness" of root
	// ... so let's make sure it has no symlinks
	if p, err := filepath.Abs(root); err != nil {
		log.Fatalf("Unable to get absolute root (%s): %s", root, err)
	} else {
		root = p
	}
	if p, err := filepath.EvalSymlinks(root); err != nil {
		log.Fatalf("Unable to canonicalize root (%s): %s", root, err)
	} else {
		root = p
	}

	eng := &Engine{
		root:     root,
		handlers: make(map[string]Handler),
		id:       utils.RandomString(),
		Stdout:   os.Stdout,
		Stderr:   os.Stderr,
		Stdin:    os.Stdin,
	}
	// Copy existing global handlers
	for k, v := range globalHandlers {
		eng.handlers[k] = v
	}
	return eng, nil
}
Ejemplo n.º 2
0
// dockerVersion returns detailed version information in the form of a queriable
// environment.
func dockerVersion() *engine.Env {
	v := &engine.Env{}
	v.Set("Version", VERSION)
	v.Set("GitCommit", GITCOMMIT)
	v.Set("GoVersion", runtime.Version())
	v.Set("Os", runtime.GOOS)
	v.Set("Arch", runtime.GOARCH)
	// FIXME:utils.GetKernelVersion should only be needed here
	if kernelVersion, err := utils.GetKernelVersion(); err == nil {
		v.Set("KernelVersion", kernelVersion.String())
	}
	return v
}