package libpod import ( "context" "os" "path" "path/filepath" "strings" "time" "github.com/containers/buildah" "github.com/containers/common/pkg/config" "github.com/containers/podman/v3/libpod/define" "github.com/containers/podman/v3/libpod/events" "github.com/containers/podman/v3/libpod/network" "github.com/containers/podman/v3/libpod/shutdown" "github.com/containers/podman/v3/pkg/cgroups" "github.com/containers/podman/v3/pkg/domain/entities/reports" "github.com/containers/podman/v3/pkg/rootless" "github.com/containers/storage" "github.com/containers/storage/pkg/stringid" "github.com/docker/go-units" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/opencontainers/runtime-tools/generate" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) // Contains the public Runtime API for containers // A CtrCreateOption is a functional option which alters the Container created // by NewContainer type CtrCreateOption func(*Container) error // ContainerFilter is a function to determine whether a container is included // in command output. Containers to be outputted are tested using the function. // A true return will include the container, a false return will exclude it. type ContainerFilter func(*Container) bool // NewContainer creates a new container from a given OCI config. func (r *Runtime) NewContainer(ctx context.Context, rSpec *spec.Spec, options ...CtrCreateOption) (*Container, error) { r.lock.Lock() defer r.lock.Unlock() if !r.valid { return nil, define.ErrRuntimeStopped } return r.newContainer(ctx, rSpec, options...) } func (r *Runtime) PrepareVolumeOnCreateContainer(ctx context.Context, ctr *Container) error { // Copy the content from the underlying image into the newly created // volume if configured to do so. if !r.config.Containers.PrepareVolumeOnCreate { return nil } defer func() { if err := ctr.cleanupStorage(); err != nil { logrus.Errorf("error cleaning up container storage %s: %v", ctr.ID(), err) } }() mountPoint, err := ctr.mountStorage() if err == nil { // Finish up mountStorage ctr.state.Mounted = true ctr.state.Mountpoint = mountPoint if err = ctr.save(); err != nil { logrus.Errorf("Error saving container %s state: %v", ctr.ID(), err) } } return err } // RestoreContainer re-creates a container from an imported checkpoint func (r *Runtime) RestoreContainer(ctx context.Context, rSpec *spec.Spec, config *ContainerConfig) (*Container, error) { r.lock.Lock() defer r.lock.Unlock() if !r.valid { return nil, define.ErrRuntimeStopped } ctr, err := r.initContainerVariables(rSpec, config) if err != nil { return nil, errors.Wrapf(err, "error initializing container variables") } // For an imported checkpoint no one has ever set the StartedTime. Set it now. ctr.state.StartedTime = time.Now() // If the path to ConmonPidFile starts with the default value (RunRoot), then // the user has not specified '--conmon-pidfile' during run or create (probably). // In that case reset ConmonPidFile to be set to the default value later. if strings.HasPrefix(ctr.config.ConmonPidFile, r.storageConfig.RunRoot) { ctr.config.ConmonPidFile = "" } // If the path to PidFile starts with the default value (RunRoot), then // the user has not specified '--pidfile' during run or create (probably). // In that case reset PidFile to be set to the default value later. if strings.HasPrefix(ctr.config.PidFile, r.storageConfig.RunRoot) { ctr.config.PidFile = "" } return r.setupContainer(ctx, ctr) } // RenameContainer renames the given container. // Returns a copy of the container that has been renamed if successful. func (r *Runtime) RenameContainer(ctx context.Context, ctr *Container, newName string) (*Container, error) { ctr.lock.Lock() defer ctr.lock.Unlock() if err := ctr.syncContainer(); err != nil { return nil, err } if newName == "" || !define.NameRegex.MatchString(newName) { return nil, define.RegexError } // We need to pull an updated config, in case another rename fired and // the config was re-written. newConf, err := r.state.GetContainerConfig(ctr.ID()) if err != nil { return nil, errors.Wrapf(err, "error retrieving container %s configuration from DB to remove", ctr.ID()) } ctr.config = newConf logrus.Infof("Going to rename container %s from %q to %q", ctr.ID(), ctr.Name(), newName) // Step 1: Alter the config. Save the old name, we need it to rewrite // the config. oldName := ctr.config.Name ctr.config.Name = newName // Step 2: rewrite the old container's config in the DB. if err := r.state.SafeRewriteContainerConfig(ctr, oldName, ctr.config.Name, ctr.config); err != nil { // Assume the rename failed. // Set config back to the old name so reflect what is actually // present in the DB. ctr.config.Name = oldName return nil, errors.Wrapf(err, "error renaming container %s", ctr.ID()) } // Step 3: rename the container in c/storage. // This can fail if the name is already in use by a non-Podman // container. This puts us in a bad spot - we've already renamed the // container in Podman. We can swap the order, but then we have the // opposite problem. Atomicity is a real problem here, with no easy // solution. if err := r.store.SetNames(ctr.ID(), []string{ctr.Name()}); err != nil { return nil, err } return ctr, nil } func (r *Runtime) initContainerVariables(rSpec *spec.Spec, config *ContainerConfig) (*Container, error) { if rSpec == nil { return nil, errors.Wrapf(define.ErrInvalidArg, "must provide a valid runtime spec to create container") } ctr := new(Container) ctr.config = new(ContainerConfig) ctr.state = new(ContainerState) if config == nil { ctr.config.ID = stringid.GenerateNonCryptoID() size, err := units.FromHumanSize(r.config.Containers.ShmSize) if err != nil { return nil, errors.Wrapf(err, "converting containers.conf ShmSize %s to an int", r.config.Containers.ShmSize) } ctr.config.ShmSize = size ctr.config.StopSignal = 15 ctr.config.StopTimeout = r.config.Engine.StopTimeout } else { // This is a restore from an imported checkpoint ctr.restoreFromCheckpoint = true if err := JSONDeepCopy(config, ctr.config); err != nil { return nil, errors.Wrapf(err, "error copying container config for restore") } // If the ID is empty a new name for the restored container was requested if ctr.config.ID == "" { ctr.config.ID = stringid.GenerateNonCryptoID() // Fixup ExitCommand with new ID ctr.config.ExitCommand[len(ctr.config.ExitCommand)-1] = ctr.config.ID } // Reset the log path to point to the default ctr.config.LogPath = "" } ctr.config.Spec = new(spec.Spec) if err := JSONDeepCopy(rSpec, ctr.config.Spec); err != nil { return nil, errors.Wrapf(err, "error copying runtime spec while creating container") } ctr.config.CreatedTime = time.Now() ctr.state.BindMounts = make(map[string]string) ctr.config.OCIRuntime = r.defaultOCIRuntime.Name() // Set namespace based on current runtime namespace // Do so before options run so they can override it if r.config.Engine.Namespace != "" { ctr.config.Namespace = r.config.Engine.Namespace } ctr.runtime = r return ctr, nil } func (r *Runtime) newContainer(ctx context.Context, rSpec *spec.Spec, options ...CtrCreateOption) (*Container, error) { ctr, err := r.initContainerVariables(rSpec, nil) if err != nil { return nil, errors.Wrapf(err, "error initializing container variables") } for _, option := range options { if err := option(ctr); err != nil { return nil, errors.Wrapf(err, "error running container create option") } } return r.setupContainer(ctx, ctr) } func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (_ *Container, retErr error) { // Validate the container if err := ctr.validate(); err != nil { return nil, err } // normalize the networks to names // ocicni only knows about cni names so we have to make // sure we do not use ids internally if len(ctr.config.Networks) > 0 { netNames := make([]string, 0, len(ctr.config.Networks)) for _, nameOrID := range ctr.config.Networks { netName, err := network.NormalizeName(r.config, nameOrID) if err != nil { return nil, err } netNames = append(netNames, netName) } ctr.config.Networks = netNames } // https://github.com/containers/podman/issues/11285 // normalize the networks aliases to use network names and never ids if len(ctr.config.NetworkAliases) > 0 { netAliases := make(map[string][]string, len(ctr.config.NetworkAliases)) for nameOrID, aliases := range ctr.config.NetworkAliases { netName, err := network.NormalizeName(r.config, nameOrID) if err != nil { return nil, err } netAliases[netName] = aliases } ctr.config.NetworkAliases = netAliases } // Inhibit shutdown until creation succeeds shutdown.Inhibit() defer shutdown.Uninhibit() // Allocate a lock for the container lock, err := r.lockManager.AllocateLock() if err != nil { return nil, errors.Wrapf(err, "error allocating lock for new container") } ctr.lock = lock ctr.config.LockID = ctr.lock.ID() logrus.Debugf("Allocated lock %d for container %s", ctr.lock.ID(), ctr.ID()) defer func() { if retErr != nil { if err := ctr.lock.Free(); err != nil { logrus.Errorf("Error freeing lock for container after creation failed: %v", err) } } }() ctr.valid = true ctr.state.State = define.ContainerStateConfigured ctr.runtime = r if ctr.config.OCIRuntime == "" { ctr.ociRuntime = r.defaultOCIRuntime } else { ociRuntime, ok := r.ociRuntimes[ctr.config.OCIRuntime] if !ok { return nil, errors.Wrapf(define.ErrInvalidArg, "requested OCI runtime %s is not available", ctr.config.OCIRuntime) } ctr.ociRuntime = ociRuntime } // Check NoCgroups support if ctr.config.NoCgroups { if !ctr.ociRuntime.SupportsNoCgroups() { return nil, errors.Wrapf(define.ErrInvalidArg, "requested OCI runtime %s is not compatible with NoCgroups", ctr.ociRuntime.Name()) } } var pod *Pod if ctr.config.Pod != "" { // Get the pod from state pod, err = r.state.Pod(ctr.config.Pod) if err != nil { return nil, errors.Wrapf(err, "cannot add container %s to pod %s", ctr.ID(), ctr.config.Pod) } } if ctr.config.Name == "" { name, err := r.generateName() if err != nil { return nil, err } ctr.config.Name = name } // Check CGroup parent sanity, and set it if it was not set. // Only if we're actually configuring CGroups. if !ctr.config.NoCgroups { ctr.config.CgroupManager = r.config.Engine.CgroupManager switch r.config.Engine.CgroupManager { case config.CgroupfsCgroupsManager: if ctr.config.CgroupParent == "" { if pod != nil && pod.config.UsePodCgroup { podCgroup, err := pod.CgroupPath() if err != nil { return nil, errors.Wrapf(err, "error retrieving pod %s cgroup", pod.ID()) } if podCgroup == "" { return nil, errors.Wrapf(define.ErrInternal, "pod %s cgroup is not set", pod.ID()) } canUseCgroup := !rootless.IsRootless() || isRootlessCgroupSet(podCgroup) if canUseCgroup { ctr.config.CgroupParent = podCgroup } } else if !rootless.IsRootless() { ctr.config.CgroupParent = CgroupfsDefaultCgroupParent } } else if strings.HasSuffix(path.Base(ctr.config.CgroupParent), ".slice") { return nil, errors.Wrapf(define.ErrInvalidArg, "systemd slice received as cgroup parent when using cgroupfs") } case config.SystemdCgroupsManager: if ctr.config.CgroupParent == "" { switch { case pod != nil && pod.config.UsePodCgroup: podCgroup, err := pod.CgroupPath() if err != nil { return nil, errors.Wrapf(err, "error retrieving pod %s cgroup", pod.ID()) } ctr.config.CgroupParent = podCgroup case rootless.IsRootless() && ctr.config.CgroupsMode != cgroupSplit: ctr.config.CgroupParent = SystemdDefaultRootlessCgroupParent case ctr.config.CgroupsMode != cgroupSplit: ctr.config.CgroupParent = SystemdDefaultCgroupParent } } else if len(ctr.config.CgroupParent) < 6 || !strings.HasSuffix(path.Base(ctr.config.CgroupParent), ".slice") { return nil, errors.Wrapf(define.ErrInvalidArg, "did not receive systemd slice as cgroup parent when using systemd to manage cgroups") } default: return nil, errors.Wrapf(define.ErrInvalidArg, "unsupported CGroup manager: %s - cannot validate cgroup parent", r.config.Engine.CgroupManager) } } if ctr.config.Timezone == "" { ctr.config.Timezone = r.config.Containers.TZ } if ctr.restoreFromCheckpoint { // Remove information about bind mount // for new container from imported checkpoint g := generate.Generator{Config: ctr.config.Spec} g.RemoveMount("/dev/shm") ctr.config.ShmDir = "" g.RemoveMount("/etc/resolv.conf") g.RemoveMount("/etc/hostname") g.RemoveMount("/etc/hosts") g.RemoveMount("/run/.containerenv") g.RemoveMount("/run/secrets") // Regenerate CGroup paths so they don't point to the old // container ID. cgroupPath, err := ctr.getOCICgroupPath() if err != nil { return nil, err } g.SetLinuxCgroupsPath(cgroupPath) } // Set up storage for the container if err := ctr.setupStorage(ctx); err != nil { return nil, err } defer func() { if retErr != nil { if err := ctr.teardownStorage(); err != nil { logrus.Errorf("Error removing partially-created container root filesystem: %s", err) } } }() ctr.config.SecretsPath = filepath.Join(ctr.config.StaticDir, "secrets") err = os.MkdirAll(ctr.config.SecretsPath, 0644) if err != nil { return nil, err } for _, secr := range ctr.config.Secrets { err = ctr.extractSecretToCtrStorage(secr) if err != nil { return nil, err } } if ctr.config.ConmonPidFile == "" { ctr.config.ConmonPidFile = filepath.Join(ctr.state.RunDir, "conmon.pid") } if ctr.config.PidFile == "" { ctr.config.PidFile = filepath.Join(ctr.state.RunDir, "pidfile") } // Go through named volumes and add them. // If they don't exist they will be created using basic options. // Maintain an array of them - we need to lock them later. ctrNamedVolumes := make([]*Volume, 0, len(ctr.config.NamedVolumes)) for _, vol := range ctr.config.NamedVolumes { isAnonymous := false if vol.Name == "" { // Anonymous volume. We'll need to create it. // It needs a name first. vol.Name = stringid.GenerateNonCryptoID() isAnonymous = true } else { // Check if it exists already dbVol, err := r.state.Volume(vol.Name) if err == nil { ctrNamedVolumes = append(ctrNamedVolumes, dbVol) // The volume exists, we're good continue } else if errors.Cause(err) != define.ErrNoSuchVolume { return nil, errors.Wrapf(err, "error retrieving named volume %s for new container", vol.Name) } } logrus.Debugf("Creating new volume %s for container", vol.Name) // The volume does not exist, so we need to create it. volOptions := []VolumeCreateOption{WithVolumeName(vol.Name), WithVolumeUID(ctr.RootUID()), WithVolumeGID(ctr.RootGID())} if isAnonymous { volOptions = append(volOptions, withSetAnon()) } newVol, err := r.newVolume(ctx, volOptions...) if err != nil { return nil, errors.Wrapf(err, "error creating named volume %q", vol.Name) } ctrNamedVolumes = append(ctrNamedVolumes, newVol) } switch ctr.config.LogDriver { case define.NoLogging: break case define.JournaldLogging: ctr.initializeJournal(ctx) default: if ctr.config.LogPath == "" { ctr.config.LogPath = filepath.Join(ctr.config.StaticDir, "ctr.log") } } if !MountExists(ctr.config.Spec.Mounts, "/dev/shm") && ctr.config.ShmDir == "" { ctr.config.ShmDir = filepath.Join(ctr.bundlePath(), "shm") if err := os.MkdirAll(ctr.config.ShmDir, 0700); err != nil { if !os.IsExist(err) { return nil, errors.Wrap(err, "unable to create shm dir") } } ctr.config.Mounts = append(ctr.config.Mounts, ctr.config.ShmDir) } // Lock all named volumes we are adding ourself to, to ensure we can't // use a volume being removed. volsLocked := make(map[string]bool) for _, namedVol := range ctrNamedVolumes { toLock := namedVol // Ensure that we don't double-lock a named volume that is used // more than once. if volsLocked[namedVol.Name()] { continue } volsLocked[namedVol.Name()] = true toLock.lock.Lock() defer toLock.lock.Unlock() } // Add the container to the state // TODO: May be worth looking into recovering from name/ID collisions here if ctr.config.Pod != "" { // Lock the pod to ensure we can't add containers to pods // being removed pod.lock.Lock() defer pod.lock.Unlock() if err := r.state.AddContainerToPod(pod, ctr); err != nil { return nil, err } } else if err := r.state.AddContainer(ctr); err != nil { return nil, err } ctr.newContainerEvent(events.Create) return ctr, nil } // RemoveContainer removes the given container // If force is specified, the container will be stopped first // If removeVolume is specified, named volumes used by the container will // be removed also if and only if the container is the sole user // Otherwise, RemoveContainer will return an error if the container is running func (r *Runtime) RemoveContainer(ctx context.Context, c *Container, force bool, removeVolume bool) error { r.lock.Lock() defer r.lock.Unlock() return r.removeContainer(ctx, c, force, removeVolume, false) } // Internal function to remove a container. // Locks the container, but does not lock the runtime. // removePod is used only when removing pods. It instructs Podman to ignore // infra container protections, and *not* remove from the database (as pod // remove will handle that). func (r *Runtime) removeContainer(ctx context.Context, c *Container, force, removeVolume, removePod bool) error { if !c.valid { if ok, _ := r.state.HasContainer(c.ID()); !ok { // Container probably already removed // Or was never in the runtime to begin with return nil } } // We need to refresh container config from the DB, to ensure that any // changes (e.g. a rename) are picked up before we start removing. // Since HasContainer above succeeded, we can safely assume the // container exists. // This is *very iffy* but it should be OK because the container won't // exist once we're done. newConf, err := r.state.GetContainerConfig(c.ID()) if err != nil { return errors.Wrapf(err, "error retrieving container %s configuration from DB to remove", c.ID()) } c.config = newConf logrus.Debugf("Removing container %s", c.ID()) // We need to lock the pod before we lock the container. // To avoid races around removing a container and the pod it is in. // Don't need to do this in pod removal case - we're evicting the entire // pod. var pod *Pod runtime := c.runtime if c.config.Pod != "" && !removePod { pod, err = r.state.Pod(c.config.Pod) if err != nil { return errors.Wrapf(err, "container %s is in pod %s, but pod cannot be retrieved", c.ID(), pod.ID()) } // Lock the pod while we're removing container if pod.config.LockID == c.config.LockID { return errors.Wrapf(define.ErrWillDeadlock, "container %s and pod %s share lock ID %d", c.ID(), pod.ID(), c.config.LockID) } pod.lock.Lock() defer pod.lock.Unlock() if err := pod.updatePod(); err != nil { return err } infraID := pod.state.InfraContainerID if c.ID() == infraID { return errors.Errorf("container %s is the infra container of pod %s and cannot be removed without removing the pod", c.ID(), pod.ID()) } } // For pod removal, the container is already locked by the caller if !removePod { c.lock.Lock() defer c.lock.Unlock() } if !r.valid { return define.ErrRuntimeStopped } // Update the container to get current state if err := c.syncContainer(); err != nil { return err } // If we're not force-removing, we need to check if we're in a good // state to remove. if !force { if err := c.checkReadyForRemoval(); err != nil { return err } } if c.state.State == define.ContainerStatePaused { if err := c.ociRuntime.KillContainer(c, 9, false); err != nil { return err } isV2, err := cgroups.IsCgroup2UnifiedMode() if err != nil { return err } // cgroups v1 and v2 handle signals on paused processes differently if !isV2 { if err := c.unpause(); err != nil { return err } } // Need to update container state to make sure we know it's stopped if err := c.waitForExitFileAndSync(); err != nil { return err } } // Check that the container's in a good state to be removed. if c.state.State == define.ContainerStateRunning { // Ignore ErrConmonDead - we couldn't retrieve the container's // exit code properly, but it's still stopped. if err := c.stop(c.StopTimeout()); err != nil && errors.Cause(err) != define.ErrConmonDead { return errors.Wrapf(err, "cannot remove container %s as it could not be stopped", c.ID()) } // We unlocked as part of stop() above - there's a chance someone // else got in and removed the container before we reacquired the // lock. // Do a quick ping of the database to check if the container // still exists. if ok, _ := r.state.HasContainer(c.ID()); !ok { return nil } } // Remove all active exec sessions if err := c.removeAllExecSessions(); err != nil { return err } // Check that no other containers depend on the container. // Only used if not removing a pod - pods guarantee that all // deps will be evicted at the same time. if !removePod { deps, err := r.state.ContainerInUse(c) if err != nil { return err } if len(deps) != 0 { depsStr := strings.Join(deps, ", ") return errors.Wrapf(define.ErrCtrExists, "container %s has dependent containers which must be removed before it: %s", c.ID(), depsStr) } } var cleanupErr error // Clean up network namespace, cgroups, mounts. // Do this before we set ContainerStateRemoving, to ensure that we can // actually remove from the OCI runtime. if err := c.cleanup(ctx); err != nil { cleanupErr = errors.Wrapf(err, "error cleaning up container %s", c.ID()) } // Set ContainerStateRemoving c.state.State = define.ContainerStateRemoving if err := c.save(); err != nil { if cleanupErr != nil { logrus.Errorf(err.Error()) } return errors.Wrapf(err, "unable to set container %s removing state in database", c.ID()) } // Stop the container's storage if err := c.teardownStorage(); err != nil { if cleanupErr == nil { cleanupErr = err } else { logrus.Errorf("cleanup storage: %v", err) } } // Remove the container from the state if c.config.Pod != "" { // If we're removing the pod, the container will be evicted // from the state elsewhere if !removePod { if err := r.state.RemoveContainerFromPod(pod, c); err != nil { if cleanupErr == nil { cleanupErr = err } else { logrus.Errorf("Error removing container %s from database: %v", c.ID(), err) } } } } else { if err := r.state.RemoveContainer(c); err != nil { if cleanupErr == nil { cleanupErr = err } else { logrus.Errorf("Error removing container %s from database: %v", c.ID(), err) } } } // Deallocate the container's lock if err := c.lock.Free(); err != nil { if cleanupErr == nil { cleanupErr = errors.Wrapf(err, "error freeing lock for container %s", c.ID()) } else { logrus.Errorf("free container lock: %v", err) } } // Set container as invalid so it can no longer be used c.valid = false c.newContainerEvent(events.Remove) if !removeVolume { return cleanupErr } for _, v := range c.config.NamedVolumes { if volume, err := runtime.state.Volume(v.Name); err == nil { if !volume.Anonymous() { continue } if err := runtime.removeVolume(ctx, volume, false); err != nil && errors.Cause(err) != define.ErrNoSuchVolume { logrus.Errorf("cleanup volume (%s): %v", v, err) } } } return cleanupErr } // EvictContainer removes the given container partial or full ID or name, and // returns the full ID of the evicted container and any error encountered. // It should be used to remove a container when obtaining a Container struct // pointer has failed. // Running container will not be stopped. // If removeVolume is specified, named volumes used by the container will // be removed also if and only if the container is the sole user. func (r *Runtime) EvictContainer(ctx context.Context, idOrName string, removeVolume bool) (string, error) { r.lock.RLock() defer r.lock.RUnlock() return r.evictContainer(ctx, idOrName, removeVolume) } // evictContainer is the internal function to handle container eviction based // on its partial or full ID or name. // It returns the full ID of the evicted container and any error encountered. // This does not lock the runtime nor the container. // removePod is used only when removing pods. It instructs Podman to ignore // infra container protections, and *not* remove from the database (as pod // remove will handle that). func (r *Runtime) evictContainer(ctx context.Context, idOrName string, removeVolume bool) (string, error) { var err error if !r.valid { return "", define.ErrRuntimeStopped } id, err := r.state.LookupContainerID(idOrName) if err != nil { return "", err } // Begin by trying a normal removal. Valid containers will be removed normally. tmpCtr, err := r.state.Container(id) if err == nil { logrus.Infof("Container %s successfully retrieved from state, attempting normal removal", id) // Assume force = true for the evict case err = r.removeContainer(ctx, tmpCtr, true, removeVolume, false) if !tmpCtr.valid { // If the container is marked invalid, remove succeeded // in kicking it out of the state - no need to continue. return id, err } if err == nil { // Something has gone seriously wrong - no error but // container was not removed. logrus.Errorf("Container %s not removed with no error", id) } else { logrus.Warnf("Failed to removal container %s normally, proceeding with evict: %v", id, err) } } // Error out if the container does not exist in libpod exists, err := r.state.HasContainer(id) if err != nil { return id, err } if !exists { return id, err } // Re-create a container struct for removal purposes c := new(Container) c.config, err = r.state.GetContainerConfig(id) if err != nil { return id, errors.Wrapf(err, "failed to retrieve config for ctr ID %q", id) } c.state = new(ContainerState) // We need to lock the pod before we lock the container. // To avoid races around removing a container and the pod it is in. // Don't need to do this in pod removal case - we're evicting the entire // pod. var pod *Pod if c.config.Pod != "" { pod, err = r.state.Pod(c.config.Pod) if err != nil { return id, errors.Wrapf(err, "container %s is in pod %s, but pod cannot be retrieved", c.ID(), pod.ID()) } // Lock the pod while we're removing container pod.lock.Lock() defer pod.lock.Unlock() if err := pod.updatePod(); err != nil { return id, err } infraID := pod.state.InfraContainerID if c.ID() == infraID { return id, errors.Errorf("container %s is the infra container of pod %s and cannot be removed without removing the pod", c.ID(), pod.ID()) } } var cleanupErr error // Remove the container from the state if c.config.Pod != "" { // If we're removing the pod, the container will be evicted // from the state elsewhere if err := r.state.RemoveContainerFromPod(pod, c); err != nil { cleanupErr = err } } else { if err := r.state.RemoveContainer(c); err != nil { cleanupErr = err } } // Unmount container mount points for _, mount := range c.config.Mounts { Unmount(mount) } // Remove container from c/storage if err := r.removeStorageContainer(id, true); err != nil { if cleanupErr == nil { cleanupErr = err } } if !removeVolume { return id, cleanupErr } for _, v := range c.config.NamedVolumes { if volume, err := r.state.Volume(v.Name); err == nil { if !volume.Anonymous() { continue } if err := r.removeVolume(ctx, volume, false); err != nil && err != define.ErrNoSuchVolume && err != define.ErrVolumeBeingUsed { logrus.Errorf("cleanup volume (%s): %v", v, err) } } } return id, cleanupErr } // GetContainer retrieves a container by its ID func (r *Runtime) GetContainer(id string) (*Container, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return nil, define.ErrRuntimeStopped } return r.state.Container(id) } // HasContainer checks if a container with the given ID is present func (r *Runtime) HasContainer(id string) (bool, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return false, define.ErrRuntimeStopped } return r.state.HasContainer(id) } // LookupContainer looks up a container by its name or a partial ID // If a partial ID is not unique, an error will be returned func (r *Runtime) LookupContainer(idOrName string) (*Container, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return nil, define.ErrRuntimeStopped } return r.state.LookupContainer(idOrName) } // LookupContainerId looks up a container id by its name or a partial ID // If a partial ID is not unique, an error will be returned func (r *Runtime) LookupContainerID(idOrName string) (string, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return "", define.ErrRuntimeStopped } return r.state.LookupContainerID(idOrName) } // GetContainers retrieves all containers from the state // Filters can be provided which will determine what containers are included in // the output. Multiple filters are handled by ANDing their output, so only // containers matching all filters are returned func (r *Runtime) GetContainers(filters ...ContainerFilter) ([]*Container, error) { r.lock.RLock() defer r.lock.RUnlock() return r.GetContainersWithoutLock(filters...) } // GetContainersWithoutLock is same as GetContainers but without lock func (r *Runtime) GetContainersWithoutLock(filters ...ContainerFilter) ([]*Container, error) { if !r.valid { return nil, define.ErrRuntimeStopped } ctrs, err := r.GetAllContainers() if err != nil { return nil, err } ctrsFiltered := make([]*Container, 0, len(ctrs)) for _, ctr := range ctrs { include := true for _, filter := range filters { include = include && filter(ctr) } if include { ctrsFiltered = append(ctrsFiltered, ctr) } } return ctrsFiltered, nil } // GetAllContainers is a helper function for GetContainers func (r *Runtime) GetAllContainers() ([]*Container, error) { return r.state.AllContainers() } // GetRunningContainers is a helper function for GetContainers func (r *Runtime) GetRunningContainers() ([]*Container, error) { running := func(c *Container) bool { state, _ := c.State() return state == define.ContainerStateRunning } return r.GetContainers(running) } // GetContainersByList is a helper function for GetContainers // which takes a []string of container IDs or names func (r *Runtime) GetContainersByList(containers []string) ([]*Container, error) { ctrs := make([]*Container, 0, len(containers)) for _, inputContainer := range containers { ctr, err := r.LookupContainer(inputContainer) if err != nil { return ctrs, errors.Wrapf(err, "unable to lookup container %s", inputContainer) } ctrs = append(ctrs, ctr) } return ctrs, nil } // GetLatestContainer returns a container object of the latest created container. func (r *Runtime) GetLatestContainer() (*Container, error) { lastCreatedIndex := -1 var lastCreatedTime time.Time ctrs, err := r.GetAllContainers() if err != nil { return nil, errors.Wrapf(err, "unable to find latest container") } if len(ctrs) == 0 { return nil, define.ErrNoSuchCtr } for containerIndex, ctr := range ctrs { createdTime := ctr.config.CreatedTime if createdTime.After(lastCreatedTime) { lastCreatedTime = createdTime lastCreatedIndex = containerIndex } } return ctrs[lastCreatedIndex], nil } // GetExecSessionContainer gets the container that a given exec session ID is // attached to. func (r *Runtime) GetExecSessionContainer(id string) (*Container, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return nil, define.ErrRuntimeStopped } ctrID, err := r.state.GetExecSession(id) if err != nil { return nil, err } return r.state.Container(ctrID) } // PruneContainers removes stopped and exited containers from localstorage. A set of optional filters // can be provided to be more granular. func (r *Runtime) PruneContainers(filterFuncs []ContainerFilter) ([]*reports.PruneReport, error) { preports := make([]*reports.PruneReport, 0) // We add getting the exited and stopped containers via a filter containerStateFilter := func(c *Container) bool { if c.PodID() != "" { return false } state, err := c.State() if err != nil { logrus.Error(err) return false } if state == define.ContainerStateStopped || state == define.ContainerStateExited || state == define.ContainerStateCreated || state == define.ContainerStateConfigured { return true } return false } filterFuncs = append(filterFuncs, containerStateFilter) delContainers, err := r.GetContainers(filterFuncs...) if err != nil { return nil, err } for _, c := range delContainers { report := new(reports.PruneReport) report.Id = c.ID() report.Err = nil report.Size = 0 size, err := c.RWSize() if err != nil { report.Err = err preports = append(preports, report) continue } err = r.RemoveContainer(context.Background(), c, false, false) if err != nil { report.Err = err } else { report.Size = (uint64)(size) } preports = append(preports, report) } return preports, nil } // MountStorageContainer mounts the storage container's root filesystem func (r *Runtime) MountStorageContainer(id string) (string, error) { if _, err := r.GetContainer(id); err == nil { return "", errors.Wrapf(define.ErrCtrExists, "ctr %s is a libpod container", id) } container, err := r.store.Container(id) if err != nil { return "", err } mountPoint, err := r.store.Mount(container.ID, "") if err != nil { return "", errors.Wrapf(err, "error mounting storage for container %s", id) } return mountPoint, nil } // UnmountStorageContainer unmounts the storage container's root filesystem func (r *Runtime) UnmountStorageContainer(id string, force bool) (bool, error) { if _, err := r.GetContainer(id); err == nil { return false, errors.Wrapf(define.ErrCtrExists, "ctr %s is a libpod container", id) } container, err := r.store.Container(id) if err != nil { return false, err } return r.store.Unmount(container.ID, force) } // MountedStorageContainer returns whether a storage container is mounted // along with the mount path func (r *Runtime) IsStorageContainerMounted(id string) (bool, string, error) { var path string if _, err := r.GetContainer(id); err == nil { return false, "", errors.Wrapf(define.ErrCtrExists, "ctr %s is a libpod container", id) } mountCnt, err := r.storageService.MountedContainerImage(id) if err != nil { return false, "", err } mounted := mountCnt > 0 if mounted { path, err = r.storageService.GetMountpoint(id) if err != nil { return false, "", err } } return mounted, path, nil } // StorageContainers returns a list of containers from containers/storage that // are not currently known to Podman. func (r *Runtime) StorageContainers() ([]storage.Container, error) { if r.store == nil { return nil, define.ErrStoreNotInitialized } storeContainers, err := r.store.Containers() if err != nil { return nil, errors.Wrapf(err, "error reading list of all storage containers") } retCtrs := []storage.Container{} for _, container := range storeContainers { exists, err := r.state.HasContainer(container.ID) if err != nil && err != define.ErrNoSuchCtr { return nil, errors.Wrapf(err, "failed to check if %s container exists in database", container.ID) } if exists { continue } retCtrs = append(retCtrs, container) } return retCtrs, nil } func (r *Runtime) IsBuildahContainer(id string) (bool, error) { return buildah.IsContainer(id, r.store) }