package libpod import ( "bytes" "strings" "sync" bolt "github.com/etcd-io/bbolt" jsoniter "github.com/json-iterator/go" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) var json = jsoniter.ConfigCompatibleWithStandardLibrary // BoltState is a state implementation backed by a Bolt DB type BoltState struct { valid bool dbPath string dbLock sync.Mutex namespace string namespaceBytes []byte runtime *Runtime } // A brief description of the format of the BoltDB state: // At the top level, the following buckets are created: // - idRegistryBkt: Maps ID to Name for containers and pods. // Used to ensure container and pod IDs are globally unique. // - nameRegistryBkt: Maps Name to ID for containers and pods. // Used to ensure container and pod names are globally unique. // - nsRegistryBkt: Maps ID to namespace for all containers and pods. // Used during lookup operations to determine if a given ID is in the same // namespace as the state. // - ctrBkt: Contains a sub-bucket for each container in the state. // Each sub-bucket has config and state keys holding the container's JSON // encoded configuration and state (respectively), an optional netNS key // containing the path to the container's network namespace, a dependencies // bucket containing the container's dependencies, and an optional pod key // containing the ID of the pod the container is joined to. // - allCtrsBkt: Map of ID to name containing only containers. Used for // container lookup operations. // - podBkt: Contains a sub-bucket for each pod in the state. // Each sub-bucket has config and state keys holding the pod's JSON encoded // configuration and state, plus a containers sub bucket holding the IDs of // containers in the pod. // - allPodsBkt: Map of ID to name containing only pods. Used for pod lookup // operations. // - runtimeConfigBkt: Contains configuration of the libpod instance that // initially created the database. This must match for any further instances // that access the database, to ensure that state mismatches with // containers/storage do not occur. // NewBoltState creates a new bolt-backed state database func NewBoltState(path string, runtime *Runtime) (State, error) { state := new(BoltState) state.dbPath = path state.runtime = runtime state.namespace = "" state.namespaceBytes = nil logrus.Debugf("Initializing boltdb state at %s", path) db, err := bolt.Open(path, 0600, nil) if err != nil { return nil, errors.Wrapf(err, "error opening database %s", path) } // Everywhere else, we use s.closeDBCon(db) to ensure the state's DB // mutex is also unlocked. // However, here, the mutex has not been locked, since we just created // the DB connection, and it hasn't left this function yet - no risk of // concurrent access. // As such, just a db.Close() is fine here. defer db.Close() createBuckets := [][]byte{ idRegistryBkt, nameRegistryBkt, nsRegistryBkt, ctrBkt, allCtrsBkt, podBkt, allPodsBkt, volBkt, allVolsBkt, runtimeConfigBkt, } // Does the DB need an update? needsUpdate := false err = db.View(func(tx *bolt.Tx) error { for _, bkt := range createBuckets { if test := tx.Bucket(bkt); test == nil { needsUpdate = true break } } return nil }) if err != nil { return nil, errors.Wrapf(err, "error checking DB schema") } if !needsUpdate { state.valid = true return state, nil } // Ensure schema is properly created in DB err = db.Update(func(tx *bolt.Tx) error { for _, bkt := range createBuckets { if _, err := tx.CreateBucketIfNotExists(bkt); err != nil { return errors.Wrapf(err, "error creating bucket %s", string(bkt)) } } return nil }) if err != nil { return nil, errors.Wrapf(err, "error creating buckets for DB") } state.valid = true return state, nil } // Close closes the state and prevents further use func (s *BoltState) Close() error { s.valid = false return nil } // Refresh clears container and pod states after a reboot func (s *BoltState) Refresh() error { if !s.valid { return ErrDBClosed } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { idBucket, err := getIDBucket(tx) if err != nil { return err } ctrsBucket, err := getCtrBucket(tx) if err != nil { return err } podsBucket, err := getPodBucket(tx) if err != nil { return err } // Iterate through all IDs. Check if they are containers. // If they are, unmarshal their state, and then clear // PID, mountpoint, and state for all of them // Then save the modified state // Also clear all network namespaces err = idBucket.ForEach(func(id, name []byte) error { ctrBkt := ctrsBucket.Bucket(id) if ctrBkt == nil { // It's a pod podBkt := podsBucket.Bucket(id) if podBkt == nil { // This is neither a pod nor a container // Error out on the dangling ID return errors.Wrapf(ErrInternal, "id %s is not a pod or a container", string(id)) } // Get the state stateBytes := podBkt.Get(stateKey) if stateBytes == nil { return errors.Wrapf(ErrInternal, "pod %s missing state key", string(id)) } state := new(podState) if err := json.Unmarshal(stateBytes, state); err != nil { return errors.Wrapf(err, "error unmarshalling state for pod %s", string(id)) } // Clear the CGroup path state.CgroupPath = "" newStateBytes, err := json.Marshal(state) if err != nil { return errors.Wrapf(err, "error marshalling modified state for pod %s", string(id)) } if err := podBkt.Put(stateKey, newStateBytes); err != nil { return errors.Wrapf(err, "error updating state for pod %s in DB", string(id)) } // It's not a container, nothing to do return nil } // First, delete the network namespace if err := ctrBkt.Delete(netNSKey); err != nil { return errors.Wrapf(err, "error removing network namespace for container %s", string(id)) } stateBytes := ctrBkt.Get(stateKey) if stateBytes == nil { // Badly formatted container bucket return errors.Wrapf(ErrInternal, "container %s missing state in DB", string(id)) } state := new(ContainerState) if err := json.Unmarshal(stateBytes, state); err != nil { return errors.Wrapf(err, "error unmarshalling state for container %s", string(id)) } if err := resetState(state); err != nil { return errors.Wrapf(err, "error resetting state for container %s", string(id)) } newStateBytes, err := json.Marshal(state) if err != nil { return errors.Wrapf(err, "error marshalling modified state for container %s", string(id)) } if err := ctrBkt.Put(stateKey, newStateBytes); err != nil { return errors.Wrapf(err, "error updating state for container %s in DB", string(id)) } return nil }) return err }) return err } // GetDBConfig retrieves runtime configuration fields that were created when // the database was first initialized func (s *BoltState) GetDBConfig() (*DBConfig, error) { if !s.valid { return nil, ErrDBClosed } cfg := new(DBConfig) db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { configBucket, err := getRuntimeConfigBucket(tx) if err != nil { return nil } // Some of these may be nil // When we convert to string, Go will coerce them to "" // That's probably fine - we could raise an error if the key is // missing, but just not including it is also OK. libpodRoot := configBucket.Get(staticDirKey) libpodTmp := configBucket.Get(tmpDirKey) storageRoot := configBucket.Get(graphRootKey) storageTmp := configBucket.Get(runRootKey) graphDriver := configBucket.Get(graphDriverKey) volumePath := configBucket.Get(volPathKey) cfg.LibpodRoot = string(libpodRoot) cfg.LibpodTmp = string(libpodTmp) cfg.StorageRoot = string(storageRoot) cfg.StorageTmp = string(storageTmp) cfg.GraphDriver = string(graphDriver) cfg.VolumePath = string(volumePath) return nil }) if err != nil { return nil, err } return cfg, nil } // ValidateDBConfig validates paths in the given runtime against the database func (s *BoltState) ValidateDBConfig(runtime *Runtime) error { if !s.valid { return ErrDBClosed } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) // Check runtime configuration if err := checkRuntimeConfig(db, runtime); err != nil { return err } return nil } // SetNamespace sets the namespace that will be used for container and pod // retrieval func (s *BoltState) SetNamespace(ns string) error { s.namespace = ns if ns != "" { s.namespaceBytes = []byte(ns) } else { s.namespaceBytes = nil } return nil } // Container retrieves a single container from the state by its full ID func (s *BoltState) Container(id string) (*Container, error) { if id == "" { return nil, ErrEmptyID } if !s.valid { return nil, ErrDBClosed } ctrID := []byte(id) ctr := new(Container) ctr.config = new(ContainerConfig) ctr.state = new(ContainerState) db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { ctrBucket, err := getCtrBucket(tx) if err != nil { return err } return s.getContainerFromDB(ctrID, ctr, ctrBucket) }) if err != nil { return nil, err } return ctr, nil } // LookupContainer retrieves a container from the state by full or unique // partial ID or name func (s *BoltState) LookupContainer(idOrName string) (*Container, error) { if idOrName == "" { return nil, ErrEmptyID } if !s.valid { return nil, ErrDBClosed } ctr := new(Container) ctr.config = new(ContainerConfig) ctr.state = new(ContainerState) db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { idBucket, err := getIDBucket(tx) if err != nil { return err } ctrBucket, err := getCtrBucket(tx) if err != nil { return err } namesBucket, err := getNamesBucket(tx) if err != nil { return err } nsBucket, err := getNSBucket(tx) if err != nil { return err } // First, check if the ID given was the actual container ID var id []byte ctrExists := ctrBucket.Bucket([]byte(idOrName)) if ctrExists != nil { // A full container ID was given. // It might not be in our namespace, but // getContainerFromDB() will handle that case. id = []byte(idOrName) return s.getContainerFromDB(id, ctr, ctrBucket) } // Next, check if the full name was given isPod := false fullID := namesBucket.Get([]byte(idOrName)) if fullID != nil { // The name exists and maps to an ID. // However, we are not yet certain the ID is a // container. ctrExists = ctrBucket.Bucket(fullID) if ctrExists != nil { // A container bucket matching the full ID was // found. return s.getContainerFromDB(fullID, ctr, ctrBucket) } // Don't error if we have a name match but it's not a // container - there's a chance we have a container with // an ID starting with those characters. // However, so we can return a good error, note whether // this is a pod. isPod = true } // We were not given a full container ID or name. // Search for partial ID matches. exists := false err = idBucket.ForEach(func(checkID, checkName []byte) error { // If the container isn't in our namespace, we // can't match it if s.namespaceBytes != nil { ns := nsBucket.Get(checkID) if !bytes.Equal(ns, s.namespaceBytes) { return nil } } if strings.HasPrefix(string(checkID), idOrName) { if exists { return errors.Wrapf(ErrCtrExists, "more than one result for container ID %s", idOrName) } id = checkID exists = true } return nil }) if err != nil { return err } else if !exists { if isPod { return errors.Wrapf(ErrNoSuchCtr, "%s is a pod, not a container", idOrName) } return errors.Wrapf(ErrNoSuchCtr, "no container with name or ID %s found", idOrName) } return s.getContainerFromDB(id, ctr, ctrBucket) }) if err != nil { return nil, err } return ctr, nil } // HasContainer checks if a container is present in the state func (s *BoltState) HasContainer(id string) (bool, error) { if id == "" { return false, ErrEmptyID } if !s.valid { return false, ErrDBClosed } ctrID := []byte(id) db, err := s.getDBCon() if err != nil { return false, err } defer s.closeDBCon(db) exists := false err = db.View(func(tx *bolt.Tx) error { ctrBucket, err := getCtrBucket(tx) if err != nil { return err } ctrDB := ctrBucket.Bucket(ctrID) if ctrDB != nil { if s.namespaceBytes != nil { nsBytes := ctrDB.Get(namespaceKey) if bytes.Equal(nsBytes, s.namespaceBytes) { exists = true } } else { exists = true } } return nil }) if err != nil { return false, err } return exists, nil } // AddContainer adds a container to the state // The container being added cannot belong to a pod func (s *BoltState) AddContainer(ctr *Container) error { if !s.valid { return ErrDBClosed } if !ctr.valid { return ErrCtrRemoved } if ctr.config.Pod != "" { return errors.Wrapf(ErrInvalidArg, "cannot add a container that belongs to a pod with AddContainer - use AddContainerToPod") } return s.addContainer(ctr, nil) } // RemoveContainer removes a container from the state // Only removes containers not in pods - for containers that are a member of a // pod, use RemoveContainerFromPod func (s *BoltState) RemoveContainer(ctr *Container) error { if !s.valid { return ErrDBClosed } if ctr.config.Pod != "" { return errors.Wrapf(ErrPodExists, "container %s is part of a pod, use RemoveContainerFromPod instead", ctr.ID()) } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { return s.removeContainer(ctr, nil, tx) }) return err } // UpdateContainer updates a container's state from the database func (s *BoltState) UpdateContainer(ctr *Container) error { if !s.valid { return ErrDBClosed } if !ctr.valid { return ErrCtrRemoved } if s.namespace != "" && s.namespace != ctr.config.Namespace { return errors.Wrapf(ErrNSMismatch, "container %s is in namespace %q, does not match our namespace %q", ctr.ID(), ctr.config.Namespace, s.namespace) } newState := new(ContainerState) netNSPath := "" ctrID := []byte(ctr.ID()) db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { ctrBucket, err := getCtrBucket(tx) if err != nil { return err } ctrToUpdate := ctrBucket.Bucket(ctrID) if ctrToUpdate == nil { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "container %s does not exist in database", ctr.ID()) } newStateBytes := ctrToUpdate.Get(stateKey) if newStateBytes == nil { return errors.Wrapf(ErrInternal, "container %s does not have a state key in DB", ctr.ID()) } if err := json.Unmarshal(newStateBytes, newState); err != nil { return errors.Wrapf(err, "error unmarshalling container %s state", ctr.ID()) } netNSBytes := ctrToUpdate.Get(netNSKey) if netNSBytes != nil { netNSPath = string(netNSBytes) } return nil }) if err != nil { return err } // Handle network namespace if err := replaceNetNS(netNSPath, ctr, newState); err != nil { return err } // New state compiled successfully, swap it into the current state ctr.state = newState return nil } // SaveContainer saves a container's current state in the database func (s *BoltState) SaveContainer(ctr *Container) error { if !s.valid { return ErrDBClosed } if !ctr.valid { return ErrCtrRemoved } if s.namespace != "" && s.namespace != ctr.config.Namespace { return errors.Wrapf(ErrNSMismatch, "container %s is in namespace %q, does not match our namespace %q", ctr.ID(), ctr.config.Namespace, s.namespace) } stateJSON, err := json.Marshal(ctr.state) if err != nil { return errors.Wrapf(err, "error marshalling container %s state to JSON", ctr.ID()) } netNSPath := getNetNSPath(ctr) ctrID := []byte(ctr.ID()) db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { ctrBucket, err := getCtrBucket(tx) if err != nil { return err } ctrToSave := ctrBucket.Bucket(ctrID) if ctrToSave == nil { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "container %s does not exist in DB", ctr.ID()) } // Update the state if err := ctrToSave.Put(stateKey, stateJSON); err != nil { return errors.Wrapf(err, "error updating container %s state in DB", ctr.ID()) } if netNSPath != "" { if err := ctrToSave.Put(netNSKey, []byte(netNSPath)); err != nil { return errors.Wrapf(err, "error updating network namespace path for container %s in DB", ctr.ID()) } } else { // Delete the existing network namespace if err := ctrToSave.Delete(netNSKey); err != nil { return errors.Wrapf(err, "error removing network namespace path for container %s in DB", ctr.ID()) } } return nil }) return err } // ContainerInUse checks if other containers depend on the given container // It returns a slice of the IDs of the containers depending on the given // container. If the slice is empty, no containers depend on the given container func (s *BoltState) ContainerInUse(ctr *Container) ([]string, error) { if !s.valid { return nil, ErrDBClosed } if !ctr.valid { return nil, ErrCtrRemoved } if s.namespace != "" && s.namespace != ctr.config.Namespace { return nil, errors.Wrapf(ErrNSMismatch, "container %s is in namespace %q, does not match our namespace %q", ctr.ID(), ctr.config.Namespace, s.namespace) } depCtrs := []string{} db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { ctrBucket, err := getCtrBucket(tx) if err != nil { return err } ctrDB := ctrBucket.Bucket([]byte(ctr.ID())) if ctrDB == nil { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "no container with ID %s found in DB", ctr.ID()) } dependsBkt := ctrDB.Bucket(dependenciesBkt) if dependsBkt == nil { return errors.Wrapf(ErrInternal, "container %s has no dependencies bucket", ctr.ID()) } // Iterate through and add dependencies err = dependsBkt.ForEach(func(id, value []byte) error { depCtrs = append(depCtrs, string(id)) return nil }) if err != nil { return err } return nil }) if err != nil { return nil, err } return depCtrs, nil } // AllContainers retrieves all the containers in the database func (s *BoltState) AllContainers() ([]*Container, error) { if !s.valid { return nil, ErrDBClosed } ctrs := []*Container{} db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { allCtrsBucket, err := getAllCtrsBucket(tx) if err != nil { return err } ctrBucket, err := getCtrBucket(tx) if err != nil { return err } return allCtrsBucket.ForEach(func(id, name []byte) error { // If performance becomes an issue, this check can be // removed. But the error messages that come back will // be much less helpful. ctrExists := ctrBucket.Bucket(id) if ctrExists == nil { return errors.Wrapf(ErrInternal, "state is inconsistent - container ID %s in all containers, but container not found", string(id)) } ctr := new(Container) ctr.config = new(ContainerConfig) ctr.state = new(ContainerState) if err := s.getContainerFromDB(id, ctr, ctrBucket); err != nil { // If the error is a namespace mismatch, we can // ignore it safely. // We just won't include the container in the // results. if errors.Cause(err) != ErrNSMismatch { // Even if it's not an NS mismatch, it's // not worth erroring over. // If we do, a single bad container JSON // could render libpod unusable. logrus.Errorf("Error retrieving container %s from the database: %v", string(id), err) } } else { ctrs = append(ctrs, ctr) } return nil }) }) if err != nil { return nil, err } return ctrs, nil } // RewriteContainerConfig rewrites a container's configuration. // WARNING: This function is DANGEROUS. Do not use without reading the full // comment on this function in state.go. func (s *BoltState) RewriteContainerConfig(ctr *Container, newCfg *ContainerConfig) error { if !s.valid { return ErrDBClosed } if !ctr.valid { return ErrCtrRemoved } newCfgJSON, err := json.Marshal(newCfg) if err != nil { return errors.Wrapf(err, "error marshalling new configuration JSON for container %s", ctr.ID()) } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { ctrBkt, err := getCtrBucket(tx) if err != nil { return err } ctrDB := ctrBkt.Bucket([]byte(ctr.ID())) if ctrDB == nil { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "no container with ID %s found in DB", ctr.ID()) } if err := ctrDB.Put(configKey, newCfgJSON); err != nil { return errors.Wrapf(err, "error updating container %s config JSON", ctr.ID()) } return nil }) return err } // RewritePodConfig rewrites a pod's configuration. // WARNING: This function is DANGEROUS. Do not use without reading the full // comment on this function in state.go. func (s *BoltState) RewritePodConfig(pod *Pod, newCfg *PodConfig) error { if !s.valid { return ErrDBClosed } if !pod.valid { return ErrPodRemoved } newCfgJSON, err := json.Marshal(newCfg) if err != nil { return errors.Wrapf(err, "error marshalling new configuration JSON for container %s", pod.ID()) } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } podDB := podBkt.Bucket([]byte(pod.ID())) if podDB == nil { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "no pod with ID %s found in DB", pod.ID()) } if err := podDB.Put(configKey, newCfgJSON); err != nil { return errors.Wrapf(err, "error updating pod %s config JSON", pod.ID()) } return nil }) return err } // Pod retrieves a pod given its full ID func (s *BoltState) Pod(id string) (*Pod, error) { if id == "" { return nil, ErrEmptyID } if !s.valid { return nil, ErrDBClosed } podID := []byte(id) pod := new(Pod) pod.config = new(PodConfig) pod.state = new(podState) db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } return s.getPodFromDB(podID, pod, podBkt) }) if err != nil { return nil, err } return pod, nil } // LookupPod retrieves a pod from full or unique partial ID or name func (s *BoltState) LookupPod(idOrName string) (*Pod, error) { if idOrName == "" { return nil, ErrEmptyID } if !s.valid { return nil, ErrDBClosed } pod := new(Pod) pod.config = new(PodConfig) pod.state = new(podState) db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { idBucket, err := getIDBucket(tx) if err != nil { return err } podBkt, err := getPodBucket(tx) if err != nil { return err } namesBkt, err := getNamesBucket(tx) if err != nil { return err } nsBkt, err := getNSBucket(tx) if err != nil { return err } // First, check if the ID given was the actual pod ID var id []byte podExists := podBkt.Bucket([]byte(idOrName)) if podExists != nil { // A full pod ID was given. // It might not be in our namespace, but getPodFromDB() // will handle that case. id = []byte(idOrName) return s.getPodFromDB(id, pod, podBkt) } // Next, check if the full name was given isCtr := false fullID := namesBkt.Get([]byte(idOrName)) if fullID != nil { // The name exists and maps to an ID. // However, we aren't yet sure if the ID is a pod. podExists = podBkt.Bucket(fullID) if podExists != nil { // A pod bucket matching the full ID was found. return s.getPodFromDB(fullID, pod, podBkt) } // Don't error if we have a name match but it's not a // pod - there's a chance we have a pod with an ID // starting with those characters. // However, so we can return a good error, note whether // this is a container. isCtr = true } // They did not give us a full pod name or ID. // Search for partial ID matches. exists := false err = idBucket.ForEach(func(checkID, checkName []byte) error { // If the pod isn't in our namespace, we // can't match it if s.namespaceBytes != nil { ns := nsBkt.Get(checkID) if !bytes.Equal(ns, s.namespaceBytes) { return nil } } if strings.HasPrefix(string(checkID), idOrName) { if exists { return errors.Wrapf(ErrPodExists, "more than one result for ID or name %s", idOrName) } id = checkID exists = true } return nil }) if err != nil { return err } else if !exists { if isCtr { return errors.Wrapf(ErrNoSuchPod, "%s is a container, not a pod", idOrName) } return errors.Wrapf(ErrNoSuchPod, "no pod with name or ID %s found", idOrName) } // We might have found a container ID, but it's OK // We'll just fail in getPodFromDB with ErrNoSuchPod return s.getPodFromDB(id, pod, podBkt) }) if err != nil { return nil, err } return pod, nil } // HasPod checks if a pod with the given ID exists in the state func (s *BoltState) HasPod(id string) (bool, error) { if id == "" { return false, ErrEmptyID } if !s.valid { return false, ErrDBClosed } podID := []byte(id) exists := false db, err := s.getDBCon() if err != nil { return false, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } podDB := podBkt.Bucket(podID) if podDB != nil { if s.namespaceBytes != nil { podNS := podDB.Get(namespaceKey) if bytes.Equal(s.namespaceBytes, podNS) { exists = true } } else { exists = true } } return nil }) if err != nil { return false, err } return exists, nil } // PodHasContainer checks if the given pod has a container with the given ID func (s *BoltState) PodHasContainer(pod *Pod, id string) (bool, error) { if id == "" { return false, ErrEmptyID } if !s.valid { return false, ErrDBClosed } if !pod.valid { return false, ErrPodRemoved } if s.namespace != "" && s.namespace != pod.config.Namespace { return false, errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } ctrID := []byte(id) podID := []byte(pod.ID()) exists := false db, err := s.getDBCon() if err != nil { return false, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } // Get pod itself podDB := podBkt.Bucket(podID) if podDB == nil { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "pod %s not found in database", pod.ID()) } // Get pod containers bucket podCtrs := podDB.Bucket(containersBkt) if podCtrs == nil { return errors.Wrapf(ErrInternal, "pod %s missing containers bucket in DB", pod.ID()) } // Don't bother with a namespace check on the container - // We maintain the invariant that container namespaces must // match the namespace of the pod they join. // We already checked the pod namespace, so we should be fine. ctr := podCtrs.Get(ctrID) if ctr != nil { exists = true } return nil }) if err != nil { return false, err } return exists, nil } // PodContainersByID returns the IDs of all containers present in the given pod func (s *BoltState) PodContainersByID(pod *Pod) ([]string, error) { if !s.valid { return nil, ErrDBClosed } if !pod.valid { return nil, ErrPodRemoved } if s.namespace != "" && s.namespace != pod.config.Namespace { return nil, errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } podID := []byte(pod.ID()) ctrs := []string{} db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } // Get pod itself podDB := podBkt.Bucket(podID) if podDB == nil { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "pod %s not found in database", pod.ID()) } // Get pod containers bucket podCtrs := podDB.Bucket(containersBkt) if podCtrs == nil { return errors.Wrapf(ErrInternal, "pod %s missing containers bucket in DB", pod.ID()) } // Iterate through all containers in the pod err = podCtrs.ForEach(func(id, val []byte) error { ctrs = append(ctrs, string(id)) return nil }) if err != nil { return err } return nil }) if err != nil { return nil, err } return ctrs, nil } // PodContainers returns all the containers present in the given pod func (s *BoltState) PodContainers(pod *Pod) ([]*Container, error) { if !s.valid { return nil, ErrDBClosed } if !pod.valid { return nil, ErrPodRemoved } if s.namespace != "" && s.namespace != pod.config.Namespace { return nil, errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } podID := []byte(pod.ID()) ctrs := []*Container{} db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } ctrBkt, err := getCtrBucket(tx) if err != nil { return err } // Get pod itself podDB := podBkt.Bucket(podID) if podDB == nil { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "pod %s not found in database", pod.ID()) } // Get pod containers bucket podCtrs := podDB.Bucket(containersBkt) if podCtrs == nil { return errors.Wrapf(ErrInternal, "pod %s missing containers bucket in DB", pod.ID()) } // Iterate through all containers in the pod err = podCtrs.ForEach(func(id, val []byte) error { newCtr := new(Container) newCtr.config = new(ContainerConfig) newCtr.state = new(ContainerState) ctrs = append(ctrs, newCtr) return s.getContainerFromDB(id, newCtr, ctrBkt) }) if err != nil { return err } return nil }) if err != nil { return nil, err } return ctrs, nil } // AddVolume adds the given volume to the state. It also adds ctrDepID to // the sub bucket holding the container dependencies that this volume has func (s *BoltState) AddVolume(volume *Volume) error { if !s.valid { return ErrDBClosed } if !volume.valid { return ErrVolumeRemoved } volName := []byte(volume.Name()) volConfigJSON, err := json.Marshal(volume.config) if err != nil { return errors.Wrapf(err, "error marshalling volume %s config to JSON", volume.Name()) } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { volBkt, err := getVolBucket(tx) if err != nil { return err } allVolsBkt, err := getAllVolsBucket(tx) if err != nil { return err } // Check if we already have a volume with the given name volExists := allVolsBkt.Get(volName) if volExists != nil { return errors.Wrapf(ErrVolumeExists, "name %s is in use", volume.Name()) } // We are good to add the volume // Make a bucket for it newVol, err := volBkt.CreateBucket(volName) if err != nil { return errors.Wrapf(err, "error creating bucket for volume %s", volume.Name()) } // Make a subbucket for the containers using the volume. Dependent container IDs will be addedremoved to // this bucket in addcontainer/removeContainer if _, err := newVol.CreateBucket(volDependenciesBkt); err != nil { return errors.Wrapf(err, "error creating bucket for containers using volume %s", volume.Name()) } if err := newVol.Put(configKey, volConfigJSON); err != nil { return errors.Wrapf(err, "error storing volume %s configuration in DB", volume.Name()) } if err := allVolsBkt.Put(volName, volName); err != nil { return errors.Wrapf(err, "error storing volume %s in all volumes bucket in DB", volume.Name()) } return nil }) return err } // RemoveVolume removes the given volume from the state func (s *BoltState) RemoveVolume(volume *Volume) error { if !s.valid { return ErrDBClosed } volName := []byte(volume.Name()) db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { volBkt, err := getVolBucket(tx) if err != nil { return err } allVolsBkt, err := getAllVolsBucket(tx) if err != nil { return err } ctrBkt, err := getCtrBucket(tx) if err != nil { return err } // Check if the volume exists volDB := volBkt.Bucket(volName) if volDB == nil { volume.valid = false return errors.Wrapf(ErrNoSuchVolume, "volume %s does not exist in DB", volume.Name()) } // Check if volume is not being used by any container // This should never be nil // But if it is, we can assume that no containers are using // the volume. volCtrsBkt := volDB.Bucket(volDependenciesBkt) if volCtrsBkt != nil { var deps []string err = volCtrsBkt.ForEach(func(id, value []byte) error { // Alright, this is ugly. // But we need it to work around the change in // volume dependency handling, to make sure that // older Podman versions don't cause DB // corruption. // Look up all dependencies and see that they // still exist before appending. ctrExists := ctrBkt.Bucket(id) if ctrExists == nil { return nil } deps = append(deps, string(id)) return nil }) if err != nil { return errors.Wrapf(err, "error getting list of dependencies from dependencies bucket for volumes %q", volume.Name()) } if len(deps) > 0 { return errors.Wrapf(ErrVolumeBeingUsed, "volume %s is being used by container(s) %s", volume.Name(), strings.Join(deps, ",")) } } // volume is ready for removal // Let's kick it out if err := allVolsBkt.Delete(volName); err != nil { return errors.Wrapf(err, "error removing volume %s from all volumes bucket in DB", volume.Name()) } if err := volBkt.DeleteBucket(volName); err != nil { return errors.Wrapf(err, "error removing volume %s from DB", volume.Name()) } return nil }) return err } // AllVolumes returns all volumes present in the state func (s *BoltState) AllVolumes() ([]*Volume, error) { if !s.valid { return nil, ErrDBClosed } volumes := []*Volume{} db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { allVolsBucket, err := getAllVolsBucket(tx) if err != nil { return err } volBucket, err := getVolBucket(tx) if err != nil { return err } err = allVolsBucket.ForEach(func(id, name []byte) error { volExists := volBucket.Bucket(id) // This check can be removed if performance becomes an // issue, but much less helpful errors will be produced if volExists == nil { return errors.Wrapf(ErrInternal, "inconsistency in state - volume %s is in all volumes bucket but volume not found", string(id)) } volume := new(Volume) volume.config = new(VolumeConfig) if err := s.getVolumeFromDB(id, volume, volBucket); err != nil { if errors.Cause(err) != ErrNSMismatch { logrus.Errorf("Error retrieving volume %s from the database: %v", string(id), err) } } else { volumes = append(volumes, volume) } return nil }) return err }) if err != nil { return nil, err } return volumes, nil } // Volume retrieves a volume from full name func (s *BoltState) Volume(name string) (*Volume, error) { if name == "" { return nil, ErrEmptyID } if !s.valid { return nil, ErrDBClosed } volName := []byte(name) volume := new(Volume) volume.config = new(VolumeConfig) db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { volBkt, err := getVolBucket(tx) if err != nil { return err } return s.getVolumeFromDB(volName, volume, volBkt) }) if err != nil { return nil, err } return volume, nil } // HasVolume returns true if the given volume exists in the state, otherwise it returns false func (s *BoltState) HasVolume(name string) (bool, error) { if name == "" { return false, ErrEmptyID } if !s.valid { return false, ErrDBClosed } volName := []byte(name) exists := false db, err := s.getDBCon() if err != nil { return false, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { volBkt, err := getVolBucket(tx) if err != nil { return err } volDB := volBkt.Bucket(volName) if volDB != nil { exists = true } return nil }) if err != nil { return false, err } return exists, nil } // VolumeInUse checks if any container is using the volume // It returns a slice of the IDs of the containers using the given // volume. If the slice is empty, no containers use the given volume func (s *BoltState) VolumeInUse(volume *Volume) ([]string, error) { if !s.valid { return nil, ErrDBClosed } if !volume.valid { return nil, ErrVolumeRemoved } depCtrs := []string{} db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { volBucket, err := getVolBucket(tx) if err != nil { return err } ctrBucket, err := getCtrBucket(tx) if err != nil { return err } volDB := volBucket.Bucket([]byte(volume.Name())) if volDB == nil { volume.valid = false return errors.Wrapf(ErrNoSuchVolume, "no volume with name %s found in DB", volume.Name()) } dependsBkt := volDB.Bucket(volDependenciesBkt) if dependsBkt == nil { return errors.Wrapf(ErrInternal, "volume %s has no dependencies bucket", volume.Name()) } // Iterate through and add dependencies err = dependsBkt.ForEach(func(id, value []byte) error { // Look up all dependencies and see that they // still exist before appending. ctrExists := ctrBucket.Bucket(id) if ctrExists == nil { return nil } depCtrs = append(depCtrs, string(id)) return nil }) if err != nil { return err } return nil }) if err != nil { return nil, err } return depCtrs, nil } // AddPod adds the given pod to the state. func (s *BoltState) AddPod(pod *Pod) error { if !s.valid { return ErrDBClosed } if !pod.valid { return ErrPodRemoved } if s.namespace != "" && s.namespace != pod.config.Namespace { return errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } podID := []byte(pod.ID()) podName := []byte(pod.Name()) var podNamespace []byte if pod.config.Namespace != "" { podNamespace = []byte(pod.config.Namespace) } podConfigJSON, err := json.Marshal(pod.config) if err != nil { return errors.Wrapf(err, "error marshalling pod %s config to JSON", pod.ID()) } podStateJSON, err := json.Marshal(pod.state) if err != nil { return errors.Wrapf(err, "error marshalling pod %s state to JSON", pod.ID()) } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } allPodsBkt, err := getAllPodsBucket(tx) if err != nil { return err } idsBkt, err := getIDBucket(tx) if err != nil { return err } namesBkt, err := getNamesBucket(tx) if err != nil { return err } nsBkt, err := getNSBucket(tx) if err != nil { return err } // Check if we already have something with the given ID and name idExist := idsBkt.Get(podID) if idExist != nil { return errors.Wrapf(ErrPodExists, "ID %s is in use", pod.ID()) } nameExist := namesBkt.Get(podName) if nameExist != nil { return errors.Wrapf(ErrPodExists, "name %s is in use", pod.Name()) } // We are good to add the pod // Make a bucket for it newPod, err := podBkt.CreateBucket(podID) if err != nil { return errors.Wrapf(err, "error creating bucket for pod %s", pod.ID()) } // Make a subbucket for pod containers if _, err := newPod.CreateBucket(containersBkt); err != nil { return errors.Wrapf(err, "error creating bucket for pod %s containers", pod.ID()) } if err := newPod.Put(configKey, podConfigJSON); err != nil { return errors.Wrapf(err, "error storing pod %s configuration in DB", pod.ID()) } if err := newPod.Put(stateKey, podStateJSON); err != nil { return errors.Wrapf(err, "error storing pod %s state JSON in DB", pod.ID()) } if podNamespace != nil { if err := newPod.Put(namespaceKey, podNamespace); err != nil { return errors.Wrapf(err, "error storing pod %s namespace in DB", pod.ID()) } if err := nsBkt.Put(podID, podNamespace); err != nil { return errors.Wrapf(err, "error storing pod %s namespace in DB", pod.ID()) } } // Add us to the ID and names buckets if err := idsBkt.Put(podID, podName); err != nil { return errors.Wrapf(err, "error storing pod %s ID in DB", pod.ID()) } if err := namesBkt.Put(podName, podID); err != nil { return errors.Wrapf(err, "error storing pod %s name in DB", pod.Name()) } if err := allPodsBkt.Put(podID, podName); err != nil { return errors.Wrapf(err, "error storing pod %s in all pods bucket in DB", pod.ID()) } return nil }) if err != nil { return err } return nil } // RemovePod removes the given pod from the state // Only empty pods can be removed func (s *BoltState) RemovePod(pod *Pod) error { if !s.valid { return ErrDBClosed } if !pod.valid { return ErrPodRemoved } if s.namespace != "" && s.namespace != pod.config.Namespace { return errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } podID := []byte(pod.ID()) podName := []byte(pod.Name()) db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } allPodsBkt, err := getAllPodsBucket(tx) if err != nil { return err } idsBkt, err := getIDBucket(tx) if err != nil { return err } namesBkt, err := getNamesBucket(tx) if err != nil { return err } nsBkt, err := getNSBucket(tx) if err != nil { return err } // Check if the pod exists podDB := podBkt.Bucket(podID) if podDB == nil { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "pod %s does not exist in DB", pod.ID()) } // Check if pod is empty // This should never be nil // But if it is, we can assume there are no containers in the // pod. // So let's eject the malformed pod without error. podCtrsBkt := podDB.Bucket(containersBkt) if podCtrsBkt != nil { cursor := podCtrsBkt.Cursor() if id, _ := cursor.First(); id != nil { return errors.Wrapf(ErrCtrExists, "pod %s is not empty", pod.ID()) } } // Pod is empty, and ready for removal // Let's kick it out if err := idsBkt.Delete(podID); err != nil { return errors.Wrapf(err, "error removing pod %s ID from DB", pod.ID()) } if err := namesBkt.Delete(podName); err != nil { return errors.Wrapf(err, "error removing pod %s name (%s) from DB", pod.ID(), pod.Name()) } if err := nsBkt.Delete(podID); err != nil { return errors.Wrapf(err, "error removing pod %s namespace from DB", pod.ID()) } if err := allPodsBkt.Delete(podID); err != nil { return errors.Wrapf(err, "error removing pod %s ID from all pods bucket in DB", pod.ID()) } if err := podBkt.DeleteBucket(podID); err != nil { return errors.Wrapf(err, "error removing pod %s from DB", pod.ID()) } return nil }) if err != nil { return err } return nil } // RemovePodContainers removes all containers in a pod func (s *BoltState) RemovePodContainers(pod *Pod) error { if !s.valid { return ErrDBClosed } if !pod.valid { return ErrPodRemoved } if s.namespace != "" && s.namespace != pod.config.Namespace { return errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } podID := []byte(pod.ID()) db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } ctrBkt, err := getCtrBucket(tx) if err != nil { return err } allCtrsBkt, err := getAllCtrsBucket(tx) if err != nil { return err } idsBkt, err := getIDBucket(tx) if err != nil { return err } namesBkt, err := getNamesBucket(tx) if err != nil { return err } // Check if the pod exists podDB := podBkt.Bucket(podID) if podDB == nil { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "pod %s does not exist in DB", pod.ID()) } podCtrsBkt := podDB.Bucket(containersBkt) if podCtrsBkt == nil { return errors.Wrapf(ErrInternal, "pod %s does not have a containers bucket", pod.ID()) } // Traverse all containers in the pod with a cursor // for-each has issues with data mutation err = podCtrsBkt.ForEach(func(id, name []byte) error { // Get the container so we can check dependencies ctr := ctrBkt.Bucket(id) if ctr == nil { // This should never happen // State is inconsistent return errors.Wrapf(ErrNoSuchCtr, "pod %s referenced nonexistant container %s", pod.ID(), string(id)) } ctrDeps := ctr.Bucket(dependenciesBkt) // This should never be nil, but if it is, we're // removing it anyways, so continue if it is if ctrDeps != nil { err = ctrDeps.ForEach(func(depID, name []byte) error { exists := podCtrsBkt.Get(depID) if exists == nil { return errors.Wrapf(ErrCtrExists, "container %s has dependency %s outside of pod %s", string(id), string(depID), pod.ID()) } return nil }) if err != nil { return err } } // Dependencies are set, we're clear to remove if err := ctrBkt.DeleteBucket(id); err != nil { return errors.Wrapf(ErrInternal, "error deleting container %s from DB", string(id)) } if err := idsBkt.Delete(id); err != nil { return errors.Wrapf(err, "error deleting container %s ID in DB", string(id)) } if err := namesBkt.Delete(name); err != nil { return errors.Wrapf(err, "error deleting container %s name in DB", string(id)) } if err := allCtrsBkt.Delete(id); err != nil { return errors.Wrapf(err, "error deleting container %s ID from all containers bucket in DB", string(id)) } return nil }) if err != nil { return err } // Delete and recreate the bucket to empty it if err := podDB.DeleteBucket(containersBkt); err != nil { return errors.Wrapf(err, "error removing pod %s containers bucket", pod.ID()) } if _, err := podDB.CreateBucket(containersBkt); err != nil { return errors.Wrapf(err, "error recreating pod %s containers bucket", pod.ID()) } return nil }) if err != nil { return err } return nil } // AddContainerToPod adds the given container to an existing pod // The container will be added to the state and the pod func (s *BoltState) AddContainerToPod(pod *Pod, ctr *Container) error { if !s.valid { return ErrDBClosed } if !pod.valid { return ErrPodRemoved } if !ctr.valid { return ErrCtrRemoved } if ctr.config.Pod != pod.ID() { return errors.Wrapf(ErrNoSuchCtr, "container %s is not part of pod %s", ctr.ID(), pod.ID()) } return s.addContainer(ctr, pod) } // RemoveContainerFromPod removes a container from an existing pod // The container will also be removed from the state func (s *BoltState) RemoveContainerFromPod(pod *Pod, ctr *Container) error { if !s.valid { return ErrDBClosed } if !pod.valid { return ErrPodRemoved } if s.namespace != "" { if s.namespace != pod.config.Namespace { return errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } if s.namespace != ctr.config.Namespace { return errors.Wrapf(ErrNSMismatch, "container %s in in namespace %q but we are in namespace %q", ctr.ID(), ctr.config.Namespace, s.namespace) } } if ctr.config.Pod == "" { return errors.Wrapf(ErrNoSuchPod, "container %s is not part of a pod, use RemoveContainer instead", ctr.ID()) } if ctr.config.Pod != pod.ID() { return errors.Wrapf(ErrInvalidArg, "container %s is not part of pod %s", ctr.ID(), pod.ID()) } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) err = db.Update(func(tx *bolt.Tx) error { return s.removeContainer(ctr, pod, tx) }) return err } // UpdatePod updates a pod's state from the database func (s *BoltState) UpdatePod(pod *Pod) error { if !s.valid { return ErrDBClosed } if !pod.valid { return ErrPodRemoved } if s.namespace != "" && s.namespace != pod.config.Namespace { return errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } newState := new(podState) db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) podID := []byte(pod.ID()) err = db.View(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } podDB := podBkt.Bucket(podID) if podDB == nil { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "no pod with ID %s found in database", pod.ID()) } // Get the pod state JSON podStateBytes := podDB.Get(stateKey) if podStateBytes == nil { return errors.Wrapf(ErrInternal, "pod %s is missing state key in DB", pod.ID()) } if err := json.Unmarshal(podStateBytes, newState); err != nil { return errors.Wrapf(err, "error unmarshalling pod %s state JSON", pod.ID()) } return nil }) if err != nil { return err } pod.state = newState return nil } // SavePod saves a pod's state to the database func (s *BoltState) SavePod(pod *Pod) error { if !s.valid { return ErrDBClosed } if !pod.valid { return ErrPodRemoved } if s.namespace != "" && s.namespace != pod.config.Namespace { return errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q but we are in namespace %q", pod.ID(), pod.config.Namespace, s.namespace) } stateJSON, err := json.Marshal(pod.state) if err != nil { return errors.Wrapf(err, "error marshalling pod %s state to JSON", pod.ID()) } db, err := s.getDBCon() if err != nil { return err } defer s.closeDBCon(db) podID := []byte(pod.ID()) err = db.Update(func(tx *bolt.Tx) error { podBkt, err := getPodBucket(tx) if err != nil { return err } podDB := podBkt.Bucket(podID) if podDB == nil { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "no pod with ID %s found in database", pod.ID()) } // Set the pod state JSON if err := podDB.Put(stateKey, stateJSON); err != nil { return errors.Wrapf(err, "error updating pod %s state in database", pod.ID()) } return nil }) if err != nil { return err } return nil } // AllPods returns all pods present in the state func (s *BoltState) AllPods() ([]*Pod, error) { if !s.valid { return nil, ErrDBClosed } pods := []*Pod{} db, err := s.getDBCon() if err != nil { return nil, err } defer s.closeDBCon(db) err = db.View(func(tx *bolt.Tx) error { allPodsBucket, err := getAllPodsBucket(tx) if err != nil { return err } podBucket, err := getPodBucket(tx) if err != nil { return err } err = allPodsBucket.ForEach(func(id, name []byte) error { podExists := podBucket.Bucket(id) // This check can be removed if performance becomes an // issue, but much less helpful errors will be produced if podExists == nil { return errors.Wrapf(ErrInternal, "inconsistency in state - pod %s is in all pods bucket but pod not found", string(id)) } pod := new(Pod) pod.config = new(PodConfig) pod.state = new(podState) if err := s.getPodFromDB(id, pod, podBucket); err != nil { if errors.Cause(err) != ErrNSMismatch { logrus.Errorf("Error retrieving pod %s from the database: %v", string(id), err) } } else { pods = append(pods, pod) } return nil }) return err }) if err != nil { return nil, err } return pods, nil }