package libpod import ( "bytes" "fmt" "io/ioutil" "os" "path/filepath" "sync" "syscall" "github.com/BurntSushi/toml" is "github.com/containers/image/storage" "github.com/containers/image/types" "github.com/containers/storage" "github.com/cri-o/ocicni/pkg/ocicni" "github.com/docker/docker/pkg/namesgenerator" "github.com/pkg/errors" "github.com/projectatomic/libpod/libpod/image" "github.com/projectatomic/libpod/pkg/hooks" sysreg "github.com/projectatomic/libpod/pkg/registries" "github.com/projectatomic/libpod/pkg/rootless" "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" ) // 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 ociRuntimePath string conmonPath string valid bool lock sync.RWMutex imageRuntime *image.Runtime } // 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:"-"` // 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"` // 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"` // HooksDir Path to the directory containing hooks configuration files HooksDir string `toml:"hooks_dir"` // HooksDirNotExistFatal switches between fatal errors and non-fatal warnings if the configured HooksDir does not exist. HooksDirNotExistFatal bool `toml:"hooks_dir_not_exist_fatal"` // DefaultMountsFile is the path to the default mounts file for testing purposes only DefaultMountsFile string `toml:"-"` } 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", "/sbin/runc", "/bin/runc", "/usr/lib/cri-o-runc/sbin/runc", }, ConmonPath: []string{ "/usr/libexec/podman/conmon", "/usr/libexec/crio/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", }, CgroupManager: CgroupfsCgroupsManager, HooksDir: hooks.DefaultDir, StaticDir: filepath.Join(storage.DefaultStoreOptions.GraphRoot, "libpod"), TmpDir: getDefaultTmpDir(), MaxLogSize: -1, NoPivotRoot: false, CNIConfigDir: "/etc/cni/net.d/", CNIPluginDir: []string{"/usr/libexec/cni", "/usr/lib/cni", "/opt/cni/bin"}, } ) // GetRootlessRuntimeDir returns the runtime directory when running as non root func GetRootlessRuntimeDir() string { hasNoEnv := false runtimeDir := os.Getenv("XDG_RUNTIME_DIR") if runtimeDir == "" { hasNoEnv = true tmpDir := filepath.Join(os.TempDir(), "user", fmt.Sprintf("%d", os.Getuid())) os.MkdirAll(tmpDir, 0700) st, err := os.Stat(tmpDir) if err == nil && int(st.Sys().(*syscall.Stat_t).Uid) == os.Getuid() && st.Mode().Perm() == 0700 { runtimeDir = tmpDir } } if runtimeDir == "" { runtimeDir = filepath.Join(os.Getenv("HOME"), "rundir") } if hasNoEnv { os.Setenv("XDG_RUNTIME_DIR", runtimeDir) } return runtimeDir } func getDefaultTmpDir() string { if !rootless.IsRootless() { return "/var/run/libpod" } rootlessRuntimeDir := GetRootlessRuntimeDir() return filepath.Join(rootlessRuntimeDir, "libpod", "tmp") } // 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) configPath := ConfigPath foundConfig := true if rootless.IsRootless() { foundConfig = false } 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) } 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 } 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) // 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 runc 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) } // Set up containers/storage 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 { // 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) if err != nil { return 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 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 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 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 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 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.lockDir, runtime) if err != nil { return err } runtime.state = state default: return 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 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 err2 } } else { return 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 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, 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") } for _, ctr := range ctrs { ctr.lock.Lock() if err := ctr.refresh(); err != nil { ctr.lock.Unlock() return err } ctr.lock.Unlock() } for _, pod := range pods { pod.lock.Lock() if err := pod.refresh(); err != nil { pod.lock.Unlock() return err } pod.lock.Unlock() } // 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. } // SaveDefaultConfig saves a copy of the default config at the given path func SaveDefaultConfig(path string) error { var w bytes.Buffer e := toml.NewEncoder(&w) if err := e.Encode(&defaultRuntimeConfig); err != nil { return err } return ioutil.WriteFile(path, w.Bytes(), 0644) } // ImageRuntime returns the imageruntime for image resolution func (r *Runtime) ImageRuntime() *image.Runtime { return r.imageRuntime } // GetLayers returns the layers available in the store func (r *Runtime) GetLayers() ([]storage.Layer, error) { return r.store.Layers() }