| package pidfile |
| |
| import ( |
| "fmt" |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| "strconv" |
| ) |
| |
| type PidFile struct { |
| path string |
| } |
| |
| func checkPidFileAlreadyExists(path string) error { |
| if pidString, err := ioutil.ReadFile(path); err == nil { |
| if pid, err := strconv.Atoi(string(pidString)); err == nil { |
| if _, err := os.Stat(filepath.Join("/proc", string(pid))); err == nil { |
| return fmt.Errorf("pid file found, ensure docker is not running or delete %s", path) |
| } |
| } |
| } |
| return nil |
| } |
| |
| func New(path string) (*PidFile, error) { |
| if err := checkPidFileAlreadyExists(path); err != nil { |
| return nil, err |
| } |
| if err := ioutil.WriteFile(path, []byte(fmt.Sprintf("%d", os.Getpid())), 0644); err != nil { |
| return nil, err |
| } |
| |
| return &PidFile{path: path}, nil |
| } |
| |
| func (file PidFile) Remove() error { |
| if err := os.Remove(file.path); err != nil { |
| return err |
| } |
| return nil |
| } |