// 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 }
// 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 }