package libpod import ( "io/ioutil" "os" "os/exec" "path/filepath" "sync" "github.com/BurntSushi/toml" is "github.com/containers/image/storage" "github.com/containers/image/types" "github.com/containers/libpod/libpod/image" "github.com/containers/libpod/libpod/lock" "github.com/containers/libpod/pkg/firewall" sysreg "github.com/containers/libpod/pkg/registries" "github.com/containers/libpod/pkg/rootless" "github.com/containers/libpod/pkg/util" "github.com/containers/storage" "github.com/cri-o/ocicni/pkg/ocicni" "github.com/docker/docker/pkg/namesgenerator" "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 // It is presently disabled SQLiteStateStore RuntimeStateStore = iota // BoltDBStateStore is a state backed by a BoltDB database BoltDBStateStore 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" // ConfigPath is the path to the libpod configuration file // This file is loaded to replace the builtin default config before // runtime options (e.g. WithStorageConfig) are applied. // If it is not present, the builtin default config is used instead // This path can be overridden when the runtime is created by using // NewRuntimeFromConfig() instead of NewRuntime() ConfigPath = "/usr/share/containers/libpod.conf" // OverrideConfigPath is the path to an override for the default libpod // configuration file. If OverrideConfigPath exists, it will be used in // place of the configuration file pointed to by ConfigPath. OverrideConfigPath = "/etc/containers/libpod.conf" // DefaultInfraImage to use for infra container DefaultInfraImage = "k8s.gcr.io/pause:3.1" // DefaultInfraCommand to be run in an infra container DefaultInfraCommand = "/pause" // DefaultInitPath is the default path to the container-init binary DefaultInitPath = "/usr/libexec/podman/catatonit" // DefaultSHMLockPath is the default path for SHM locks DefaultSHMLockPath = "/libpod_lock" // DefaultRootlessSHMLockPath is the default path for rootless SHM locks DefaultRootlessSHMLockPath = "/libpod_rootless_lock" ) // 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 netPlugin ocicni.CNIPlugin ociRuntimePath string conmonPath string valid bool lock sync.RWMutex imageRuntime *image.Runtime firewallBackend firewall.FirewallBackend lockManager lock.Manager configuredFrom *runtimeConfiguredFrom } // RuntimeConfig contains configuration options used to set up the runtime type RuntimeConfig struct { // StorageConfig is the configuration used by containers/storage // Not included in on-disk config, use the dedicated containers/storage // configuration file instead StorageConfig storage.StoreOptions `toml:"-"` VolumePath string `toml:"volume_path"` // ImageDefaultTransport is the default transport method used to fetch // images ImageDefaultTransport string `toml:"image_default_transport"` // SignaturePolicyPath is the path to a signature policy to use for // validating images // If left empty, the containers/image default signature policy will // be used SignaturePolicyPath string `toml:"signature_policy_path,omitempty"` // StateType is the type of the backing state store. // Avoid using multiple values for this with the same containers/storage // configuration on the same system. Different state types do not // interact, and each will see a separate set of containers, which may // cause conflicts in containers/storage // As such this is not exposed via the config file StateType RuntimeStateStore `toml:"-"` // RuntimePath is the path to OCI runtime binary for launching // containers // The first path pointing to a valid file will be used RuntimePath []string `toml:"runtime_path"` // ConmonPath is the path to the Conmon binary used for managing // containers // The first path pointing to a valid file will be used ConmonPath []string `toml:"conmon_path"` // ConmonEnvVars are environment variables to pass to the Conmon binary // when it is launched ConmonEnvVars []string `toml:"conmon_env_vars"` // CGroupManager is the CGroup Manager to use // Valid values are "cgroupfs" and "systemd" CgroupManager string `toml:"cgroup_manager"` // InitPath is the path to the container-init binary. InitPath string `toml:"init_path"` // StaticDir is the path to a persistent directory to store container // files StaticDir string `toml:"static_dir"` // TmpDir is the path to a temporary directory to store per-boot // container files // Must be stored in a tmpfs TmpDir string `toml:"tmp_dir"` // MaxLogSize is the maximum size of container logfiles MaxLogSize int64 `toml:"max_log_size,omitempty"` // NoPivotRoot sets whether to set no-pivot-root in the OCI runtime NoPivotRoot bool `toml:"no_pivot_root"` // CNIConfigDir sets the directory where CNI configuration files are // stored CNIConfigDir string `toml:"cni_config_dir"` // CNIPluginDir sets a number of directories where the CNI network // plugins can be located CNIPluginDir []string `toml:"cni_plugin_dir"` // CNIDefaultNetwork is the network name of the default CNI network // to attach pods to CNIDefaultNetwork string `toml:"cni_default_network,omitempty"` // HooksDir holds paths to the directories containing hooks // configuration files. When the same filename is present in in // multiple directories, the file in the directory listed last in // this slice takes precedence. HooksDir []string `toml:"hooks_dir"` // DefaultMountsFile is the path to the default mounts file for testing // purposes only DefaultMountsFile string `toml:"-"` // Namespace is the libpod namespace to use. // Namespaces are used to create scopes to separate containers and pods // in the state. // When namespace is set, libpod will only view containers and pods in // the same namespace. All containers and pods created will default to // the namespace set here. // A namespace of "", the empty string, is equivalent to no namespace, // and all containers and pods will be visible. // The default namespace is "". Namespace string `toml:"namespace,omitempty"` // InfraImage is the image a pod infra container will use to manage namespaces InfraImage string `toml:"infra_image"` // InfraCommand is the command run to start up a pod infra container InfraCommand string `toml:"infra_command"` // EnablePortReservation determines whether libpod will reserve ports on // the host when they are forwarded to containers. // When enabled, when ports are forwarded to containers, they are // held open by conmon as long as the container is running, ensuring // that they cannot be reused by other programs on the host. // However, this can cause significant memory usage if a container has // many ports forwarded to it. Disabling this can save memory. EnablePortReservation bool `toml:"enable_port_reservation"` // EnableLabeling indicates wether libpod will support container labeling EnableLabeling bool `toml:"label"` // NumLocks is the number of locks to make available for containers and // pods. NumLocks uint32 `toml:"num_locks,omitempty"` } // runtimeConfiguredFrom is a struct used during early runtime init to help // assemble the full RuntimeConfig struct from defaults. // It indicated whether several fields in the runtime configuration were set // explicitly. // If they were not, we may override them with information from the database, // if it exists and differs from what is present in the system already. type runtimeConfiguredFrom struct { storageGraphDriverSet bool storageGraphRootSet bool storageRunRootSet bool libpodStaticDirSet bool libpodTmpDirSet bool } var ( defaultRuntimeConfig = RuntimeConfig{ // Leave this empty so containers/storage will use its defaults StorageConfig: storage.StoreOptions{}, ImageDefaultTransport: DefaultTransport, StateType: BoltDBStateStore, RuntimePath: []string{ "/usr/bin/runc", "/usr/sbin/runc", "/usr/local/bin/runc", "/usr/local/sbin/runc", "/sbin/runc", "/bin/runc", "/usr/lib/cri-o-runc/sbin/runc", }, ConmonPath: []string{ "/usr/libexec/podman/conmon", "/usr/libexec/crio/conmon", "/usr/local/lib/podman/conmon", "/usr/local/libexec/crio/conmon", "/usr/bin/conmon", "/usr/sbin/conmon", "/usr/lib/crio/bin/conmon", }, ConmonEnvVars: []string{ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", }, InitPath: DefaultInitPath, CgroupManager: SystemdCgroupsManager, StaticDir: filepath.Join(storage.DefaultStoreOptions.GraphRoot, "libpod"), TmpDir: "", MaxLogSize: -1, NoPivotRoot: false, CNIConfigDir: "/etc/cni/net.d/", CNIPluginDir: []string{"/usr/libexec/cni", "/usr/lib/cni", "/usr/local/lib/cni", "/opt/cni/bin"}, InfraCommand: DefaultInfraCommand, InfraImage: DefaultInfraImage, EnablePortReservation: true, EnableLabeling: true, NumLocks: 2048, } ) func getDefaultTmpDir() (string, error) { if !rootless.IsRootless() { return "/var/run/libpod", nil } rootlessRuntimeDir, err := util.GetRootlessRuntimeDir() if err != nil { return "", err } return filepath.Join(rootlessRuntimeDir, "libpod", "tmp"), nil } // SetXdgRuntimeDir ensures the XDG_RUNTIME_DIR env variable is set // containers/image uses XDG_RUNTIME_DIR to locate the auth file. func SetXdgRuntimeDir(val string) error { if !rootless.IsRootless() { return nil } if val == "" { var err error val, err = util.GetRootlessRuntimeDir() if err != nil { return err } } if err := os.Setenv("XDG_RUNTIME_DIR", val); err != nil { return errors.Wrapf(err, "cannot set XDG_RUNTIME_DIR") } return nil } // 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) runtime.configuredFrom = new(runtimeConfiguredFrom) // Copy the default configuration tmpDir, err := getDefaultTmpDir() if err != nil { return nil, err } deepcopier.Copy(defaultRuntimeConfig).To(runtime.config) runtime.config.TmpDir = tmpDir if rootless.IsRootless() { // If we're rootless, override the default storage config storageConf, volumePath, err := util.GetDefaultStoreOptions() if err != nil { return nil, errors.Wrapf(err, "error retrieving rootless storage config") } runtime.config.StorageConfig = storageConf runtime.config.StaticDir = filepath.Join(storageConf.GraphRoot, "libpod") runtime.config.VolumePath = volumePath } configPath := ConfigPath foundConfig := true rootlessConfigPath := "" if rootless.IsRootless() { home := os.Getenv("HOME") if runtime.config.SignaturePolicyPath == "" { newPath := filepath.Join(home, ".config/containers/policy.json") if _, err := os.Stat(newPath); err == nil { runtime.config.SignaturePolicyPath = newPath } } rootlessConfigPath = filepath.Join(home, ".config/containers/libpod.conf") configPath = rootlessConfigPath if _, err := os.Stat(configPath); err != nil { foundConfig = false } runtimeDir, err := util.GetRootlessRuntimeDir() if err != nil { return nil, err } // containers/image uses XDG_RUNTIME_DIR to locate the auth file. // So make sure the env variable is set. err = SetXdgRuntimeDir(runtimeDir) if err != nil { return nil, errors.Wrapf(err, "cannot set XDG_RUNTIME_DIR") } } else if _, err := os.Stat(OverrideConfigPath); err == nil { // Use the override configuration path configPath = OverrideConfigPath } else if _, err := os.Stat(ConfigPath); err != nil { // Both stat checks failed, no config found foundConfig = false } // If we have a valid configuration file, load it in if foundConfig { contents, err := ioutil.ReadFile(configPath) if err != nil { return nil, errors.Wrapf(err, "error reading configuration file %s", configPath) } // This is ugly, but we need to decode twice. // Once to check if libpod static and tmp dirs were explicitly // set (not enough to check if they're not the default value, // might have been explicitly configured to the default). // A second time to actually get a usable config. tmpConfig := new(RuntimeConfig) if _, err := toml.Decode(string(contents), tmpConfig); err != nil { return nil, errors.Wrapf(err, "error decoding configuration file %s", configPath) } if tmpConfig.StaticDir != "" { runtime.configuredFrom.libpodStaticDirSet = true } if tmpConfig.TmpDir != "" { runtime.configuredFrom.libpodTmpDirSet = true } if _, err := toml.Decode(string(contents), runtime.config); err != nil { return nil, errors.Wrapf(err, "error decoding configuration file %s", configPath) } } // Overwrite config with user-given configuration options for _, opt := range options { if err := opt(runtime); err != nil { return nil, errors.Wrapf(err, "error configuring runtime") } } if err := makeRuntime(runtime); err != nil { return nil, err } if !foundConfig && rootlessConfigPath != "" { os.MkdirAll(filepath.Dir(rootlessConfigPath), 0755) file, err := os.OpenFile(rootlessConfigPath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666) if err != nil && !os.IsExist(err) { return nil, errors.Wrapf(err, "cannot open file %s", rootlessConfigPath) } if err == nil { defer file.Close() enc := toml.NewEncoder(file) if err := enc.Encode(runtime.config); err != nil { os.Remove(rootlessConfigPath) } } } return runtime, nil } // NewRuntimeFromConfig creates a new container runtime using the given // configuration file for its default configuration. Passed RuntimeOption // functions can be used to mutate this configuration further. // An error will be returned if the configuration file at the given path does // not exist or cannot be loaded func NewRuntimeFromConfig(configPath string, options ...RuntimeOption) (runtime *Runtime, err error) { runtime = new(Runtime) runtime.config = new(RuntimeConfig) runtime.configuredFrom = new(runtimeConfiguredFrom) // Set two fields not in the TOML config runtime.config.StateType = defaultRuntimeConfig.StateType runtime.config.StorageConfig = storage.StoreOptions{} // Check to see if the given configuration file exists if _, err := os.Stat(configPath); err != nil { return nil, errors.Wrapf(err, "error checking existence of configuration file %s", configPath) } // Read contents of the config file contents, err := ioutil.ReadFile(configPath) if err != nil { return nil, errors.Wrapf(err, "error reading configuration file %s", configPath) } // Decode configuration file if _, err := toml.Decode(string(contents), runtime.config); err != nil { return nil, errors.Wrapf(err, "error decoding configuration from file %s", configPath) } // Overwrite the config with user-given configuration options for _, opt := range options { if err := opt(runtime); err != nil { return nil, errors.Wrapf(err, "error configuring runtime") } } if err := makeRuntime(runtime); err != nil { return nil, err } return runtime, nil } // Make a new runtime based on the given configuration // Sets up containers/storage, state store, OCI runtime func makeRuntime(runtime *Runtime) (err error) { // Find a working OCI runtime binary foundRuntime := false for _, path := range runtime.config.RuntimePath { stat, err := os.Stat(path) if err != nil { continue } if stat.IsDir() { continue } foundRuntime = true runtime.ociRuntimePath = path break } if !foundRuntime { return errors.Wrapf(ErrInvalidArg, "could not find a working binary (configured options: %v)", runtime.config.RuntimePath) } // Find a working conmon binary foundConmon := false for _, path := range runtime.config.ConmonPath { stat, err := os.Stat(path) if err != nil { continue } if stat.IsDir() { continue } foundConmon = true runtime.conmonPath = path break } if !foundConmon { return errors.Wrapf(ErrInvalidArg, "could not find a working conmon binary (configured options: %v)", runtime.config.ConmonPath) } // Make the static files directory if it does not exist if err := os.MkdirAll(runtime.config.StaticDir, 0700); err != nil { // The directory is allowed to exist if !os.IsExist(err) { return errors.Wrapf(err, "error creating runtime static files directory %s", runtime.config.StaticDir) } } // Set up the state switch runtime.config.StateType { case InMemoryStateStore: state, err := NewInMemoryState() if err != nil { return err } runtime.state = state case SQLiteStateStore: return errors.Wrapf(ErrInvalidArg, "SQLite state is currently disabled") case BoltDBStateStore: dbPath := filepath.Join(runtime.config.StaticDir, "bolt_state.db") state, err := NewBoltState(dbPath, runtime) if err != nil { return err } runtime.state = state default: return errors.Wrapf(ErrInvalidArg, "unrecognized state type passed") } // Grab config from the database so we can reset some defaults dbConfig, err := runtime.state.GetDBConfig() if err != nil { return errors.Wrapf(err, "error retrieving runtime configuration from database") } // Reset defaults if they were not explicitly set if !runtime.configuredFrom.storageGraphDriverSet && dbConfig.GraphDriver != "" { runtime.config.StorageConfig.GraphDriverName = dbConfig.GraphDriver } if !runtime.configuredFrom.storageGraphRootSet && dbConfig.StorageRoot != "" { runtime.config.StorageConfig.GraphRoot = dbConfig.StorageRoot } if !runtime.configuredFrom.storageRunRootSet && dbConfig.StorageTmp != "" { runtime.config.StorageConfig.RunRoot = dbConfig.StorageTmp } if !runtime.configuredFrom.libpodStaticDirSet && dbConfig.LibpodRoot != "" { runtime.config.StaticDir = dbConfig.LibpodRoot } if !runtime.configuredFrom.libpodTmpDirSet && dbConfig.LibpodTmp != "" { runtime.config.TmpDir = dbConfig.LibpodTmp } logrus.Debugf("Using graph driver %s", runtime.config.StorageConfig.GraphDriverName) logrus.Debugf("Using graph root %s", runtime.config.StorageConfig.GraphRoot) logrus.Debugf("Using run root %s", runtime.config.StorageConfig.RunRoot) logrus.Debugf("Using static dir %s", runtime.config.StaticDir) logrus.Debugf("Using tmp dir %s", runtime.config.TmpDir) // Validate our config against the database, now that we've set our // final storage configuration if err := runtime.state.ValidateDBConfig(runtime); err != nil { return err } if err := runtime.state.SetNamespace(runtime.config.Namespace); err != nil { return errors.Wrapf(err, "error setting libpod namespace in state") } logrus.Debugf("Set libpod namespace to %q", runtime.config.Namespace) // Set up containers/storage var store storage.Store if rootless.SkipStorageSetup() { logrus.Debug("Not configuring container store") } else { store, err = storage.GetStore(runtime.config.StorageConfig) if err != nil { return err } } runtime.store = store is.Transport.SetStore(store) // Set up image runtime and store in runtime ir := image.NewImageRuntimeFromStore(runtime.store) if err != nil { return err } runtime.imageRuntime = ir // Setting signaturepolicypath ir.SignaturePolicyPath = runtime.config.SignaturePolicyPath defer func() { if err != nil && store != 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 err } runtime.storageService = storageService // Set up containers/image runtime.imageContext = &types.SystemContext{ SignaturePolicyPath: runtime.config.SignaturePolicyPath, } // Create the tmpDir if err := os.MkdirAll(runtime.config.TmpDir, 0751); err != nil { // The directory is allowed to exist if !os.IsExist(err) { return errors.Wrapf(err, "error creating tmpdir %s", runtime.config.TmpDir) } } // Make an OCI runtime to perform container operations ociRuntime, err := newOCIRuntime("runc", runtime.ociRuntimePath, runtime.conmonPath, runtime.config.ConmonEnvVars, runtime.config.CgroupManager, runtime.config.TmpDir, runtime.config.MaxLogSize, runtime.config.NoPivotRoot, runtime.config.EnablePortReservation) if err != nil { return err } runtime.ociRuntime = ociRuntime // 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 errors.Wrapf(err, "error creating runtime temporary files directory %s", runtime.config.TmpDir) } } // Set up the CNI net plugin if !rootless.IsRootless() { netPlugin, err := ocicni.InitCNI(runtime.config.CNIDefaultNetwork, runtime.config.CNIConfigDir, runtime.config.CNIPluginDir...) if err != nil { return errors.Wrapf(err, "error configuring CNI network plugin") } runtime.netPlugin = netPlugin } // Set up a firewall backend backendType := "" if rootless.IsRootless() { backendType = "none" } fwBackend, err := firewall.GetBackend(backendType) if err != nil { return err } runtime.firewallBackend = fwBackend // 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 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() locked := true doRefresh := false defer func() { if locked { 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) { doRefresh = true } else { return errors.Wrapf(err, "error reading runtime status file %s", runtimeAliveFile) } } // Set up the lock manager var manager lock.Manager lockPath := DefaultSHMLockPath if rootless.IsRootless() { lockPath = DefaultRootlessSHMLockPath } if doRefresh { // If SHM locks already exist, delete them and reinitialize if err := os.Remove(filepath.Join("/dev/shm", lockPath)); err != nil && !os.IsNotExist(err) { return errors.Wrapf(err, "error deleting existing libpod SHM segment %s", lockPath) } manager, err = lock.NewSHMLockManager(lockPath, runtime.config.NumLocks) if err != nil { return errors.Wrapf(err, "error creating SHM locks for libpod") } } else { manager, err = lock.OpenSHMLockManager(lockPath, runtime.config.NumLocks) if err != nil { return errors.Wrapf(err, "error opening libpod SHM locks") } } runtime.lockManager = manager // If we need to refresh the state, do it now - things are guaranteed to // be set up by now. if doRefresh { if os.Geteuid() != 0 { aliveLock.Unlock() locked = false if err2 := runtime.refreshRootless(); err2 != nil { return err2 } } else { if err2 := runtime.refresh(runtimeAliveFile); err2 != nil { return err2 } } } // Mark the runtime as valid - ready to be used, cannot be modified // further runtime.valid = true return 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 r.store != nil { 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 for a rootless process func (r *Runtime) refreshRootless() error { // Take advantage of a command that requires a new userns // so that we are running as the root user and able to use refresh() cmd := exec.Command(os.Args[0], "info") return cmd.Run() } // 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, and all the pods to recreate cgroups ctrs, err := r.state.AllContainers() if err != nil { return errors.Wrapf(err, "error retrieving all containers from state") } pods, err := r.state.AllPods() if err != nil { return errors.Wrapf(err, "error retrieving all pods from state") } // No locks are taken during pod and container refresh. // Furthermore, the pod and container refresh() functions are not // allowed to take locks themselves. // We cannot assume that any pod or container has a valid lock until // after this function has returned. // The runtime alive lock should suffice to provide mutual exclusion // until this has run. for _, ctr := range ctrs { if err := ctr.refresh(); err != nil { logrus.Errorf("Error refreshing container %s: %v", ctr.ID(), err) } } for _, pod := range pods { if err := pod.refresh(); err != nil { logrus.Errorf("Error refreshing pod %s: %v", pod.ID(), 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}) reg, err := sysreg.GetRegistries() if err != nil { return nil, errors.Wrapf(err, "error getting registries") } registries := make(map[string]interface{}) registries["registries"] = reg info = append(info, InfoData{Type: "registries", Data: registries}) i, err := sysreg.GetInsecureRegistries() if err != nil { return nil, errors.Wrapf(err, "error getting registries") } insecureRegistries := make(map[string]interface{}) insecureRegistries["registries"] = i info = append(info, InfoData{Type: "insecure registries", Data: insecureRegistries}) return info, nil } // generateName generates a unique name for a container or pod. func (r *Runtime) generateName() (string, error) { for { name := namesgenerator.GetRandomName(0) // Make sure container with this name does not exist if _, err := r.state.LookupContainer(name); err == nil { continue } else { if errors.Cause(err) != ErrNoSuchCtr { return "", err } } // Make sure pod with this name does not exist if _, err := r.state.LookupPod(name); err == nil { continue } else { if errors.Cause(err) != ErrNoSuchPod { return "", err } } return name, nil } // The code should never reach here. } // ImageRuntime returns the imageruntime for image resolution func (r *Runtime) ImageRuntime() *image.Runtime { return r.imageRuntime } // SystemContext returns the imagecontext func (r *Runtime) SystemContext() *types.SystemContext { return r.imageContext }