package plugin import ( "encoding/json" "io" "io/ioutil" "os" "path/filepath" "reflect" "regexp" "strings" "sync" "github.com/Sirupsen/logrus" "github.com/docker/distribution/reference" "github.com/docker/docker/api/types" "github.com/docker/docker/image" "github.com/docker/docker/layer" "github.com/docker/docker/libcontainerd" "github.com/docker/docker/pkg/ioutils" "github.com/docker/docker/pkg/mount" "github.com/docker/docker/plugin/v2" "github.com/docker/docker/registry" "github.com/opencontainers/go-digest" "github.com/pkg/errors" ) const configFileName = "config.json" const rootFSFileName = "rootfs" var validFullID = regexp.MustCompile(`^([a-f0-9]{64})$`) func (pm *Manager) restorePlugin(p *v2.Plugin) error { if p.IsEnabled() { return pm.restore(p) } return nil } type eventLogger func(id, name, action string) // ManagerConfig defines configuration needed to start new manager. type ManagerConfig struct { Store *Store // remove Executor libcontainerd.Remote RegistryService registry.Service LiveRestoreEnabled bool // TODO: remove LogPluginEvent eventLogger Root string ExecRoot string } // Manager controls the plugin subsystem. type Manager struct { config ManagerConfig mu sync.RWMutex // protects cMap muGC sync.RWMutex // protects blobstore deletions cMap map[*v2.Plugin]*controller containerdClient libcontainerd.Client blobStore *basicBlobStore } // controller represents the manager's control on a plugin. type controller struct { restart bool exitChan chan bool timeoutInSecs int } // pluginRegistryService ensures that all resolved repositories // are of the plugin class. type pluginRegistryService struct { registry.Service } func (s pluginRegistryService) ResolveRepository(name reference.Named) (repoInfo *registry.RepositoryInfo, err error) { repoInfo, err = s.Service.ResolveRepository(name) if repoInfo != nil { repoInfo.Class = "plugin" } return } // NewManager returns a new plugin manager. func NewManager(config ManagerConfig) (*Manager, error) { if config.RegistryService != nil { config.RegistryService = pluginRegistryService{config.RegistryService} } manager := &Manager{ config: config, } if err := os.MkdirAll(manager.config.Root, 0700); err != nil { return nil, errors.Wrapf(err, "failed to mkdir %v", manager.config.Root) } if err := os.MkdirAll(manager.config.ExecRoot, 0700); err != nil { return nil, errors.Wrapf(err, "failed to mkdir %v", manager.config.ExecRoot) } if err := os.MkdirAll(manager.tmpDir(), 0700); err != nil { return nil, errors.Wrapf(err, "failed to mkdir %v", manager.tmpDir()) } var err error manager.containerdClient, err = config.Executor.Client(manager) // todo: move to another struct if err != nil { return nil, errors.Wrap(err, "failed to create containerd client") } manager.blobStore, err = newBasicBlobStore(filepath.Join(manager.config.Root, "storage/blobs")) if err != nil { return nil, err } manager.cMap = make(map[*v2.Plugin]*controller) if err := manager.reload(); err != nil { return nil, errors.Wrap(err, "failed to restore plugins") } return manager, nil } func (pm *Manager) tmpDir() string { return filepath.Join(pm.config.Root, "tmp") } // StateChanged updates plugin internals using libcontainerd events. func (pm *Manager) StateChanged(id string, e libcontainerd.StateInfo) error { logrus.Debugf("plugin state changed %s %#v", id, e) switch e.State { case libcontainerd.StateExit: p, err := pm.config.Store.GetV2Plugin(id) if err != nil { return err } pm.mu.RLock() c := pm.cMap[p] if c.exitChan != nil { close(c.exitChan) } restart := c.restart pm.mu.RUnlock() os.RemoveAll(filepath.Join(pm.config.ExecRoot, id)) if p.PropagatedMount != "" { if err := mount.Unmount(p.PropagatedMount); err != nil { logrus.Warnf("Could not unmount %s: %v", p.PropagatedMount, err) } } if restart { pm.enable(p, c, true) } } return nil } func (pm *Manager) reload() error { // todo: restore dir, err := ioutil.ReadDir(pm.config.Root) if err != nil { return errors.Wrapf(err, "failed to read %v", pm.config.Root) } plugins := make(map[string]*v2.Plugin) for _, v := range dir { if validFullID.MatchString(v.Name()) { p, err := pm.loadPlugin(v.Name()) if err != nil { return err } plugins[p.GetID()] = p } } pm.config.Store.SetAll(plugins) var wg sync.WaitGroup wg.Add(len(plugins)) for _, p := range plugins { c := &controller{} // todo: remove this pm.cMap[p] = c go func(p *v2.Plugin) { defer wg.Done() if err := pm.restorePlugin(p); err != nil { logrus.Errorf("failed to restore plugin '%s': %s", p.Name(), err) return } if p.Rootfs != "" { p.Rootfs = filepath.Join(pm.config.Root, p.PluginObj.ID, "rootfs") } // We should only enable rootfs propagation for certain plugin types that need it. for _, typ := range p.PluginObj.Config.Interface.Types { if (typ.Capability == "volumedriver" || typ.Capability == "graphdriver") && typ.Prefix == "docker" && strings.HasPrefix(typ.Version, "1.") { if p.PluginObj.Config.PropagatedMount != "" { // TODO: sanitize PropagatedMount and prevent breakout p.PropagatedMount = filepath.Join(p.Rootfs, p.PluginObj.Config.PropagatedMount) if err := os.MkdirAll(p.PropagatedMount, 0755); err != nil { logrus.Errorf("failed to create PropagatedMount directory at %s: %v", p.PropagatedMount, err) return } } } } pm.save(p) requiresManualRestore := !pm.config.LiveRestoreEnabled && p.IsEnabled() if requiresManualRestore { // if liveRestore is not enabled, the plugin will be stopped now so we should enable it if err := pm.enable(p, c, true); err != nil { logrus.Errorf("failed to enable plugin '%s': %s", p.Name(), err) } } }(p) } wg.Wait() return nil } func (pm *Manager) loadPlugin(id string) (*v2.Plugin, error) { p := filepath.Join(pm.config.Root, id, configFileName) dt, err := ioutil.ReadFile(p) if err != nil { return nil, errors.Wrapf(err, "error reading %v", p) } var plugin v2.Plugin if err := json.Unmarshal(dt, &plugin); err != nil { return nil, errors.Wrapf(err, "error decoding %v", p) } return &plugin, nil } func (pm *Manager) save(p *v2.Plugin) error { pluginJSON, err := json.Marshal(p) if err != nil { return errors.Wrap(err, "failed to marshal plugin json") } if err := ioutils.AtomicWriteFile(filepath.Join(pm.config.Root, p.GetID(), configFileName), pluginJSON, 0600); err != nil { return err } return nil } // GC cleans up unrefrenced blobs. This is recommended to run in a goroutine func (pm *Manager) GC() { pm.muGC.Lock() defer pm.muGC.Unlock() whitelist := make(map[digest.Digest]struct{}) for _, p := range pm.config.Store.GetAll() { whitelist[p.Config] = struct{}{} for _, b := range p.Blobsums { whitelist[b] = struct{}{} } } pm.blobStore.gc(whitelist) } type logHook struct{ id string } func (logHook) Levels() []logrus.Level { return logrus.AllLevels } func (l logHook) Fire(entry *logrus.Entry) error { entry.Data = logrus.Fields{"plugin": l.id} return nil } func attachToLog(id string) func(libcontainerd.IOPipe) error { return func(iop libcontainerd.IOPipe) error { iop.Stdin.Close() logger := logrus.New() logger.Hooks.Add(logHook{id}) // TODO: cache writer per id w := logger.Writer() go func() { io.Copy(w, iop.Stdout) }() go func() { // TODO: update logrus and use logger.WriterLevel io.Copy(w, iop.Stderr) }() return nil } } func validatePrivileges(requiredPrivileges, privileges types.PluginPrivileges) error { // todo: make a better function that doesn't check order if !reflect.DeepEqual(privileges, requiredPrivileges) { return errors.New("incorrect privileges") } return nil } func configToRootFS(c []byte) (*image.RootFS, error) { var pluginConfig types.PluginConfig if err := json.Unmarshal(c, &pluginConfig); err != nil { return nil, err } // validation for empty rootfs is in distribution code if pluginConfig.Rootfs == nil { return nil, nil } return rootFSFromPlugin(pluginConfig.Rootfs), nil } func rootFSFromPlugin(pluginfs *types.PluginConfigRootfs) *image.RootFS { rootFS := image.RootFS{ Type: pluginfs.Type, DiffIDs: make([]layer.DiffID, len(pluginfs.DiffIds)), } for i := range pluginfs.DiffIds { rootFS.DiffIDs[i] = layer.DiffID(pluginfs.DiffIds[i]) } return &rootFS }