| package daemon // import "github.com/docker/docker/daemon" |
| |
| import ( |
| "fmt" |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| |
| "github.com/docker/docker/pkg/ioutils" |
| "github.com/google/uuid" |
| ) |
| |
| func loadOrCreateUUID(path string) (string, error) { |
| err := os.MkdirAll(filepath.Dir(path), 0755) |
| if err != nil { |
| return "", err |
| } |
| var id string |
| idb, err := ioutil.ReadFile(path) |
| if os.IsNotExist(err) { |
| id = uuid.New().String() |
| if err := ioutils.AtomicWriteFile(path, []byte(id), os.FileMode(0600)); err != nil { |
| return "", fmt.Errorf("Error saving uuid file: %s", err) |
| } |
| } else if err != nil { |
| return "", fmt.Errorf("Error loading uuid file %s: %s", path, err) |
| } else { |
| idp, err := uuid.Parse(string(idb)) |
| if err != nil { |
| return "", fmt.Errorf("Error parsing uuid in file %s: %s", path, err) |
| } |
| id = idp.String() |
| } |
| return id, nil |
| } |