package daemon import ( "bufio" "fmt" "io" "os" "regexp" "strings" "github.com/Sirupsen/logrus" "github.com/docker/docker/pkg/mount" ) // On Linux, plugins use a static path for storing execution state, // instead of deriving path from daemon's exec-root. This is because // plugin socket files are created here and they cannot exceed max // path length of 108 bytes. func getPluginExecRoot(root string) string { return "/run/docker/plugins" } func (daemon *Daemon) cleanupMountsByID(id string) error { logrus.Debugf("Cleaning up old mountid %s: start.", id) f, err := os.Open("/proc/self/mountinfo") if err != nil { return err } defer f.Close() return daemon.cleanupMountsFromReaderByID(f, id, mount.Unmount) } func (daemon *Daemon) cleanupMountsFromReaderByID(reader io.Reader, id string, unmount func(target string) error) error { if daemon.root == "" { return nil } var errors []string regexps := getCleanPatterns(id) sc := bufio.NewScanner(reader) for sc.Scan() { if fields := strings.Fields(sc.Text()); len(fields) >= 4 { if mnt := fields[4]; strings.HasPrefix(mnt, daemon.root) { for _, p := range regexps { if p.MatchString(mnt) { if err := unmount(mnt); err != nil { logrus.Error(err) errors = append(errors, err.Error()) } } } } } } if err := sc.Err(); err != nil { return err } if len(errors) > 0 { return fmt.Errorf("Error cleaning up mounts:\n%v", strings.Join(errors, "\n")) } logrus.Debugf("Cleaning up old mountid %v: done.", id) return nil } // cleanupMounts umounts shm/mqueue mounts for old containers func (daemon *Daemon) cleanupMounts() error { return daemon.cleanupMountsByID("") } func getCleanPatterns(id string) (regexps []*regexp.Regexp) { var patterns []string if id == "" { id = "[0-9a-f]{64}" patterns = append(patterns, "containers/"+id+"/shm") } patterns = append(patterns, "aufs/mnt/"+id+"$", "overlay/"+id+"/merged$", "zfs/graph/"+id+"$") for _, p := range patterns { r, err := regexp.Compile(p) if err == nil { regexps = append(regexps, r) } } return }