package libpod import ( "context" "encoding/json" "time" istorage "github.com/containers/image/storage" "github.com/containers/image/types" "github.com/containers/storage" "github.com/opencontainers/image-spec/specs-go/v1" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) type storageService struct { store storage.Store } // getStorageService returns a storageService which can create container root // filesystems from images func getStorageService(store storage.Store) (*storageService, error) { return &storageService{store: store}, nil } // ContainerInfo wraps a subset of information about a container: the locations // of its nonvolatile and volatile per-container directories, along with a copy // of the configuration blob from the image that was used to create the // container, if the image had a configuration. type ContainerInfo struct { Dir string RunDir string Config *v1.Image } // RuntimeContainerMetadata is the structure that we encode as JSON and store // in the metadata field of storage.Container objects. It is used for // specifying attributes containers when they are being created, and allows a // container's MountLabel, and possibly other values, to be modified in one // read/write cycle via calls to storageService.ContainerMetadata, // RuntimeContainerMetadata.SetMountLabel, and // storageService.SetContainerMetadata. type RuntimeContainerMetadata struct { // The provided name and the ID of the image that was used to // instantiate the container. ImageName string `json:"image-name"` // Applicable to both PodSandboxes and Containers ImageID string `json:"image-id"` // Applicable to both PodSandboxes and Containers // The container's name, which for an infrastructure container is usually PodName + "-infra". ContainerName string `json:"name"` // Applicable to both PodSandboxes and Containers, mandatory CreatedAt int64 `json:"created-at"` // Applicable to both PodSandboxes and Containers MountLabel string `json:"mountlabel,omitempty"` // Applicable to both PodSandboxes and Containers } // SetMountLabel updates the mount label held by a RuntimeContainerMetadata // object. func (metadata *RuntimeContainerMetadata) SetMountLabel(mountLabel string) { metadata.MountLabel = mountLabel } // CreateContainerStorage creates the storage end of things. We already have the container spec created // TO-DO We should be passing in an Image object in the future. func (r *storageService) CreateContainerStorage(ctx context.Context, systemContext *types.SystemContext, imageName, imageID, containerName, containerID, mountLabel string, options *storage.ContainerOptions) (cinfo ContainerInfo, err error) { var imageConfig *v1.Image if imageName != "" { var ref types.ImageReference if containerName == "" { return ContainerInfo{}, ErrEmptyID } // Check if we have the specified image. ref, err := istorage.Transport.ParseStoreReference(r.store, imageID) if err != nil { return ContainerInfo{}, err } img, err := istorage.Transport.GetStoreImage(r.store, ref) if err != nil { return ContainerInfo{}, err } // Pull out a copy of the image's configuration. image, err := ref.NewImage(ctx, systemContext) if err != nil { return ContainerInfo{}, err } defer image.Close() // Get OCI configuration of image imageConfig, err = image.OCIConfig(ctx) if err != nil { return ContainerInfo{}, err } // Update the image name and ID. if imageName == "" && len(img.Names) > 0 { imageName = img.Names[0] } imageID = img.ID } // Build metadata to store with the container. metadata := RuntimeContainerMetadata{ ImageName: imageName, ImageID: imageID, ContainerName: containerName, CreatedAt: time.Now().Unix(), MountLabel: mountLabel, } mdata, err := json.Marshal(&metadata) if err != nil { return ContainerInfo{}, err } // Build the container. names := []string{containerName} if options == nil { options = &storage.ContainerOptions{ IDMappingOptions: storage.IDMappingOptions{ HostUIDMapping: true, HostGIDMapping: true, }, } } container, err := r.store.CreateContainer(containerID, names, imageID, "", string(mdata), options) if err != nil { logrus.Debugf("failed to create container %s(%s): %v", metadata.ContainerName, containerID, err) return ContainerInfo{}, err } logrus.Debugf("created container %q", container.ID) // If anything fails after this point, we need to delete the incomplete // container before returning. defer func() { if err != nil { if err2 := r.store.DeleteContainer(container.ID); err2 != nil { logrus.Infof("%v deleting partially-created container %q", err2, container.ID) return } logrus.Infof("deleted partially-created container %q", container.ID) } }() // Add a name to the container's layer so that it's easier to follow // what's going on if we're just looking at the storage-eye view of things. layerName := metadata.ContainerName + "-layer" names, err = r.store.Names(container.LayerID) if err != nil { return ContainerInfo{}, err } names = append(names, layerName) err = r.store.SetNames(container.LayerID, names) if err != nil { return ContainerInfo{}, err } // Find out where the container work directories are, so that we can return them. containerDir, err := r.store.ContainerDirectory(container.ID) if err != nil { return ContainerInfo{}, err } logrus.Debugf("container %q has work directory %q", container.ID, containerDir) containerRunDir, err := r.store.ContainerRunDirectory(container.ID) if err != nil { return ContainerInfo{}, err } logrus.Debugf("container %q has run directory %q", container.ID, containerRunDir) return ContainerInfo{ Dir: containerDir, RunDir: containerRunDir, Config: imageConfig, }, nil } func (r *storageService) DeleteContainer(idOrName string) error { if idOrName == "" { return ErrEmptyID } container, err := r.store.Container(idOrName) if err != nil { return err } err = r.store.DeleteContainer(container.ID) if err != nil { logrus.Debugf("failed to delete container %q: %v", container.ID, err) return err } return nil } func (r *storageService) SetContainerMetadata(idOrName string, metadata RuntimeContainerMetadata) error { mdata, err := json.Marshal(&metadata) if err != nil { logrus.Debugf("failed to encode metadata for %q: %v", idOrName, err) return err } return r.store.SetMetadata(idOrName, string(mdata)) } func (r *storageService) GetContainerMetadata(idOrName string) (RuntimeContainerMetadata, error) { metadata := RuntimeContainerMetadata{} mdata, err := r.store.Metadata(idOrName) if err != nil { return metadata, err } if err = json.Unmarshal([]byte(mdata), &metadata); err != nil { return metadata, err } return metadata, nil } func (r *storageService) MountContainerImage(idOrName string) (string, error) { container, err := r.store.Container(idOrName) if err != nil { if errors.Cause(err) == storage.ErrContainerUnknown { return "", ErrNoSuchCtr } return "", err } metadata := RuntimeContainerMetadata{} if err = json.Unmarshal([]byte(container.Metadata), &metadata); err != nil { return "", err } mountPoint, err := r.store.Mount(container.ID, metadata.MountLabel) if err != nil { logrus.Debugf("failed to mount container %q: %v", container.ID, err) return "", err } logrus.Debugf("mounted container %q at %q", container.ID, mountPoint) return mountPoint, nil } func (r *storageService) UnmountContainerImage(idOrName string) (bool, error) { if idOrName == "" { return false, ErrEmptyID } container, err := r.store.Container(idOrName) if err != nil { return false, err } mounted, err := r.store.Unmount(container.ID, false) if err != nil { logrus.Debugf("failed to unmount container %q: %v", container.ID, err) return false, err } logrus.Debugf("unmounted container %q", container.ID) return mounted, nil } func (r *storageService) MountedContainerImage(idOrName string) (int, error) { if idOrName == "" { return 0, ErrEmptyID } container, err := r.store.Container(idOrName) if err != nil { return 0, err } mounted, err := r.store.Mounted(container.ID) if err != nil { return 0, err } return mounted, nil } func (r *storageService) GetWorkDir(id string) (string, error) { container, err := r.store.Container(id) if err != nil { if errors.Cause(err) == storage.ErrContainerUnknown { return "", ErrNoSuchCtr } return "", err } return r.store.ContainerDirectory(container.ID) } func (r *storageService) GetRunDir(id string) (string, error) { container, err := r.store.Container(id) if err != nil { if errors.Cause(err) == storage.ErrContainerUnknown { return "", ErrNoSuchCtr } return "", err } return r.store.ContainerRunDirectory(container.ID) }