package libpod import ( "os" "path/filepath" "sync" is "github.com/containers/image/storage" "github.com/containers/image/types" "github.com/containers/storage" "github.com/cri-o/ocicni/pkg/ocicni" "github.com/pkg/errors" "github.com/sirupsen/logrus" "github.com/ulule/deepcopier" ) // RuntimeStateStore is a constant indicating which state store implementation // should be used by libpod type RuntimeStateStore int const ( // InvalidStateStore is an invalid state store InvalidStateStore RuntimeStateStore = iota // InMemoryStateStore is an in-memory state that will not persist data // on containers and pods between libpod instances or after system // reboot InMemoryStateStore RuntimeStateStore = iota // SQLiteStateStore is a state backed by a SQLite database SQLiteStateStore RuntimeStateStore = iota // SeccompDefaultPath defines the default seccomp path SeccompDefaultPath = "/usr/share/containers/seccomp.json" // SeccompOverridePath if this exists it overrides the default seccomp path SeccompOverridePath = "/etc/crio/seccomp.json" ) // A RuntimeOption is a functional option which alters the Runtime created by // NewRuntime type RuntimeOption func(*Runtime) error // Runtime is the core libpod runtime type Runtime struct { config *RuntimeConfig state State store storage.Store storageService *storageService imageContext *types.SystemContext ociRuntime *OCIRuntime lockDir string netPlugin ocicni.CNIPlugin valid bool lock sync.RWMutex } // RuntimeConfig contains configuration options used to set up the runtime type RuntimeConfig struct { StorageConfig storage.StoreOptions ImageDefaultTransport string InsecureRegistries []string Registries []string SignaturePolicyPath string StateType RuntimeStateStore RuntimePath string ConmonPath string ConmonEnvVars []string CgroupManager string StaticDir string TmpDir string MaxLogSize int64 NoPivotRoot bool CNIConfigDir string CNIPluginDir []string } var ( defaultRuntimeConfig = RuntimeConfig{ // Leave this empty so containers/storage will use its defaults StorageConfig: storage.StoreOptions{}, ImageDefaultTransport: DefaultTransport, StateType: SQLiteStateStore, RuntimePath: findRuncPath(), ConmonPath: findConmonPath(), ConmonEnvVars: []string{ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", }, CgroupManager: "cgroupfs", StaticDir: filepath.Join(storage.DefaultStoreOptions.GraphRoot, "libpod"), TmpDir: "/var/run/libpod", MaxLogSize: -1, NoPivotRoot: false, CNIConfigDir: "/etc/cni/net.d/", CNIPluginDir: []string{"/usr/libexec/cni", "/opt/cni/bin"}, } ) func findConmonPath() string { paths := []string{"/usr/libexec/crio/conmon", "/usr/local/libexec/crio/conmon", "/usr/bin/conmon", "/usr/sbin/conmon"} return pathHelper(paths) } func findRuncPath() string { paths := []string{"/usr/bin/runc", "/usr/sbin/runc", "/sbin/runc", "/bin/runc"} return pathHelper(paths) } func pathHelper(paths []string) string { for _, path := range paths { if _, err := os.Stat(path); err == nil { return path } } return paths[0] } // NewRuntime creates a new container runtime // Options can be passed to override the default configuration for the runtime func NewRuntime(options ...RuntimeOption) (runtime *Runtime, err error) { runtime = new(Runtime) runtime.config = new(RuntimeConfig) // Copy the default configuration deepcopier.Copy(defaultRuntimeConfig).To(runtime.config) // Overwrite it with user-given configuration options for _, opt := range options { if err := opt(runtime); err != nil { return nil, errors.Wrapf(err, "error configuring runtime") } } // Check for the existence of the runc binary if _, err := os.Stat(runtime.config.RuntimePath); err != nil { return nil, errors.Errorf("unable to find runc binary %s", runtime.config.RuntimePath) } // Set up containers/storage store, err := storage.GetStore(runtime.config.StorageConfig) if err != nil { return nil, err } runtime.store = store is.Transport.SetStore(store) defer func() { if err != nil { // Don't forcibly shut down // We could be opening a store in use by another libpod _, err2 := store.Shutdown(false) if err2 != nil { logrus.Errorf("Error removing store for partially-created runtime: %s", err2) } } }() // Set up a storage service for creating container root filesystems from // images storageService, err := getStorageService(runtime.store) if err != nil { return nil, err } runtime.storageService = storageService // Set up containers/image runtime.imageContext = &types.SystemContext{ SignaturePolicyPath: runtime.config.SignaturePolicyPath, } // Make an OCI runtime to perform container operations ociRuntime, err := newOCIRuntime("runc", runtime.config.RuntimePath, runtime.config.ConmonPath, runtime.config.ConmonEnvVars, runtime.config.CgroupManager, runtime.config.TmpDir, runtime.config.MaxLogSize, runtime.config.NoPivotRoot) if err != nil { return nil, err } runtime.ociRuntime = ociRuntime // Make the static files directory if it does not exist if err := os.MkdirAll(runtime.config.StaticDir, 0755); err != nil { // The directory is allowed to exist if !os.IsExist(err) { return nil, errors.Wrapf(err, "error creating runtime static files directory %s", runtime.config.StaticDir) } } // Make a directory to hold container lockfiles lockDir := filepath.Join(runtime.config.TmpDir, "lock") if err := os.MkdirAll(lockDir, 0755); err != nil { // The directory is allowed to exist if !os.IsExist(err) { return nil, errors.Wrapf(err, "error creating runtime lockfiles directory %s", lockDir) } } runtime.lockDir = lockDir // Make the per-boot files directory if it does not exist if err := os.MkdirAll(runtime.config.TmpDir, 0755); err != nil { // The directory is allowed to exist if !os.IsExist(err) { return nil, errors.Wrapf(err, "error creating runtime temporary files directory %s", runtime.config.TmpDir) } } // Set up the CNI net plugin netPlugin, err := ocicni.InitCNI(runtime.config.CNIConfigDir, runtime.config.CNIPluginDir...) if err != nil { return nil, errors.Wrapf(err, "error configuring CNI network plugin") } runtime.netPlugin = netPlugin // Set up the state switch runtime.config.StateType { case InMemoryStateStore: state, err := NewInMemoryState() if err != nil { return nil, err } runtime.state = state case SQLiteStateStore: dbPath := filepath.Join(runtime.config.StaticDir, "sql_state.db") specsDir := filepath.Join(runtime.config.StaticDir, "ocispec") // Make a directory to hold JSON versions of container OCI specs if err := os.MkdirAll(specsDir, 0755); err != nil { // The directory is allowed to exist if !os.IsExist(err) { return nil, errors.Wrapf(err, "error creating runtime OCI specs directory %s", specsDir) } } state, err := NewSQLState(dbPath, specsDir, runtime.lockDir, runtime) if err != nil { return nil, err } runtime.state = state default: return nil, errors.Wrapf(ErrInvalidArg, "unrecognized state type passed") } // We now need to see if the system has restarted // We check for the presence of a file in our tmp directory to verify this // This check must be locked to prevent races runtimeAliveLock := filepath.Join(runtime.config.TmpDir, "alive.lck") runtimeAliveFile := filepath.Join(runtime.config.TmpDir, "alive") aliveLock, err := storage.GetLockfile(runtimeAliveLock) if err != nil { return nil, errors.Wrapf(err, "error acquiring runtime init lock") } // Acquire the lock and hold it until we return // This ensures that no two processes will be in runtime.refresh at once // TODO: we can't close the FD in this lock, so we should keep it around // and use it to lock important operations aliveLock.Lock() defer aliveLock.Unlock() _, err = os.Stat(runtimeAliveFile) if err != nil { // If the file doesn't exist, we need to refresh the state // This will trigger on first use as well, but refreshing an // empty state only creates a single file // As such, it's not really a performance concern if os.IsNotExist(err) { if err2 := runtime.refresh(runtimeAliveFile); err2 != nil { return nil, err2 } } else { return nil, errors.Wrapf(err, "error reading runtime status file %s", runtimeAliveFile) } } // Mark the runtime as valid - ready to be used, cannot be modified // further runtime.valid = true return runtime, nil } // GetConfig returns a copy of the configuration used by the runtime func (r *Runtime) GetConfig() *RuntimeConfig { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return nil } config := new(RuntimeConfig) // Copy so the caller won't be able to modify the actual config deepcopier.Copy(r.config).To(config) return config } // Shutdown shuts down the runtime and associated containers and storage // If force is true, containers and mounted storage will be shut down before // cleaning up; if force is false, an error will be returned if there are // still containers running or mounted func (r *Runtime) Shutdown(force bool) error { r.lock.Lock() defer r.lock.Unlock() if !r.valid { return ErrRuntimeStopped } r.valid = false // Shutdown all containers if --force is given if force { ctrs, err := r.state.AllContainers() if err != nil { logrus.Errorf("Error retrieving containers from database: %v", err) } else { for _, ctr := range ctrs { if err := ctr.StopWithTimeout(CtrRemoveTimeout); err != nil { logrus.Errorf("Error stopping container %s: %v", ctr.ID(), err) } } } } var lastError error if _, err := r.store.Shutdown(force); err != nil { lastError = errors.Wrapf(err, "Error shutting down container storage") } if err := r.state.Close(); err != nil { if lastError != nil { logrus.Errorf("%v", lastError) } lastError = err } return lastError } // Reconfigures the runtime after a reboot // Refreshes the state, recreating temporary files // Does not check validity as the runtime is not valid until after this has run func (r *Runtime) refresh(alivePath string) error { // First clear the state in the database if err := r.state.Refresh(); err != nil { return err } // Next refresh the state of all containers to recreate dirs and // namespaces ctrs, err := r.state.AllContainers() if err != nil { return errors.Wrapf(err, "error retrieving all containers from state") } for _, ctr := range ctrs { if err := ctr.refresh(); err != nil { return err } } // Create a file indicating the runtime is alive and ready file, err := os.OpenFile(alivePath, os.O_RDONLY|os.O_CREATE, 0644) if err != nil { return errors.Wrapf(err, "error creating runtime status file %s", alivePath) } defer file.Close() return nil } // Info returns the store and host information func (r *Runtime) Info() ([]InfoData, error) { info := []InfoData{} // get host information hostInfo, err := r.hostInfo() if err != nil { return nil, errors.Wrapf(err, "error getting host info") } info = append(info, InfoData{Type: "host", Data: hostInfo}) // get store information storeInfo, err := r.storeInfo() if err != nil { return nil, errors.Wrapf(err, "error getting store info") } info = append(info, InfoData{Type: "store", Data: storeInfo}) return info, nil }