storage

type AdditionalLayer interface {
	// PutAs creates layer based on this handler, using diff contents from the additional
	// layer store.
	PutAs(id, parent string, names []string) (*Layer, error)

	// UncompressedDigest returns the uncompressed digest of this layer
	UncompressedDigest() digest.Digest

	// CompressedSize returns the compressed size of this layer
	CompressedSize() int64

	// Release tells the additional layer store that we don't use this handler.
	Release()
}

type ApplyStagedLayerOptions struct {
	ID           string        // Mandatory
	ParentLayer  string        // Optional
	Names        []string      // Optional
	MountLabel   string        // Optional
	Writeable    bool          // Optional
	LayerOptions *LayerOptions // Optional

	DiffOutput  *drivers.DriverWithDifferOutput  // Mandatory
	DiffOptions *drivers.ApplyDiffWithDifferOpts // Mandatory
}

type AutoUserNsOptions = types.AutoUserNsOptions

type CheckOptions struct {
	LayerUnreferencedMaximumAge *time.Duration // maximum allowed age of unreferenced layers
	LayerDigests                bool           // check that contents of image layer diffs can still be reconstructed
	LayerMountable              bool           // check that layers are mountable
	LayerContents               bool           // check that contents of image layers match their diffs, with no unexpected changes, requires LayerMountable
	LayerData                   bool           // check that associated "big" data items are present and can be read
	ImageData                   bool           // check that associated "big" data items are present, can be read, and match the recorded size
	ContainerData               bool           // check that associated "big" data items are present and can be read
}

type CheckReport struct {
	Layers   map[string][]error // damaged read-write layers
	ROLayers map[string][]error // damaged read-only layers

	Images     map[string][]error // damaged read-write images (including those with damaged layers)
	ROImages   map[string][]error // damaged read-only images (including those with damaged layers)
	Containers map[string][]error // damaged containers (including those based on damaged images)
	// contains filtered or unexported fields
}

type Container struct {
	// ID is either one which was specified at create-time, or a random
	// value which was generated by the library.
	ID string `json:"id"`

	// Names is an optional set of user-defined convenience values.  The
	// container can be referred to by its ID or any of its names.  Names
	// are unique among containers.
	Names []string `json:"names,omitempty"`

	// ImageID is the ID of the image which was used to create the container.
	ImageID string `json:"image"`

	// LayerID is the ID of the read-write layer for the container itself.
	// It is assumed that the image's top layer is the parent of the container's
	// read-write layer.
	LayerID string `json:"layer"`

	// Metadata is data we keep for the convenience of the caller.  It is not
	// expected to be large, since it is kept in memory.
	Metadata string `json:"metadata,omitempty"`

	// BigDataNames is a list of names of data items that we keep for the
	// convenience of the caller.  They can be large, and are only in
	// memory when being read from or written to disk.
	BigDataNames []string `json:"big-data-names,omitempty"`

	// BigDataSizes maps the names in BigDataNames to the sizes of the data
	// that has been stored, if they're known.
	BigDataSizes map[string]int64 `json:"big-data-sizes,omitempty"`

	// BigDataDigests maps the names in BigDataNames to the digests of the
	// data that has been stored, if they're known.
	BigDataDigests map[string]digest.Digest `json:"big-data-digests,omitempty"`

	// Created is the datestamp for when this container was created.  Older
	// versions of the library did not track this information, so callers
	// will likely want to use the IsZero() method to verify that a value
	// is set before using it.
	Created time.Time `json:"created,omitempty"`

	// UIDMap and GIDMap are used for setting up a container's root
	// filesystem for use inside of a user namespace where UID mapping is
	// being used.
	UIDMap []idtools.IDMap `json:"uidmap,omitempty"`
	GIDMap []idtools.IDMap `json:"gidmap,omitempty"`

	Flags map[string]interface{} `json:"flags,omitempty"`
	// contains filtered or unexported fields
}

type ContainerBigDataOption struct {
	Key  string
	Data []byte
}

type ContainerOptions struct {
	// IDMappingOptions specifies the type of ID mapping which should be
	// used for this container's layer.  If nothing is specified, the
	// container's layer will inherit settings from the image's top layer
	// or, if it is not being created based on an image, the Store object.
	types.IDMappingOptions
	LabelOpts []string
	// Flags is a set of named flags and their values to store with the container.
	// Currently these can only be set when the container record is created, but that
	// could change in the future.
	Flags      map[string]interface{}
	MountOpts  []string
	Volatile   bool
	StorageOpt map[string]string
	// Metadata is caller-specified metadata associated with the container.
	Metadata string
	// BigData is a set of items which should be stored for the container.
	BigData []ContainerBigDataOption
}

type DiffOptions struct {
	// Compression, if set overrides the default compressor when generating a diff.
	Compression *archive.Compression
}

type IDMappingOptions = types.IDMappingOptions

type Image struct {
	// ID is either one which was specified at create-time, or a random
	// value which was generated by the library.
	ID string `json:"id"`

	// Digest is a digest value that we can use to locate the image, if one
	// was specified at creation-time.
	Digest digest.Digest `json:"digest,omitempty"`

	// Digests is a list of digest values of the image's manifests, and
	// possibly a manually-specified value, that we can use to locate the
	// image.  If Digest is set, its value is also in this list.
	Digests []digest.Digest `json:"-"`

	// Names is an optional set of user-defined convenience values.  The
	// image can be referred to by its ID or any of its names.  Names are
	// unique among images, and are often the text representation of tagged
	// or canonical references.
	Names []string `json:"names,omitempty"`

	// NamesHistory is an optional set of Names the image had in the past. The
	// contained names are free from any duplicates, whereas the newest entry
	// is the first one.
	NamesHistory []string `json:"names-history,omitempty"`

	// TopLayer is the ID of the topmost layer of the image itself, if the
	// image contains one or more layers.  Multiple images can refer to the
	// same top layer.
	TopLayer string `json:"layer,omitempty"`

	// MappedTopLayers are the IDs of alternate versions of the top layer
	// which have the same contents and parent, and which differ from
	// TopLayer only in which ID mappings they use.  When the image is
	// to be removed, they should be removed before the TopLayer, as the
	// graph driver may depend on that.
	MappedTopLayers []string `json:"mapped-layers,omitempty"`

	// Metadata is data we keep for the convenience of the caller.  It is not
	// expected to be large, since it is kept in memory.
	Metadata string `json:"metadata,omitempty"`

	// BigDataNames is a list of names of data items that we keep for the
	// convenience of the caller.  They can be large, and are only in
	// memory when being read from or written to disk.
	BigDataNames []string `json:"big-data-names,omitempty"`

	// BigDataSizes maps the names in BigDataNames to the sizes of the data
	// that has been stored, if they're known.
	BigDataSizes map[string]int64 `json:"big-data-sizes,omitempty"`

	// BigDataDigests maps the names in BigDataNames to the digests of the
	// data that has been stored, if they're known.
	BigDataDigests map[string]digest.Digest `json:"big-data-digests,omitempty"`

	// Created is the datestamp for when this image was created.  Older
	// versions of the library did not track this information, so callers
	// will likely want to use the IsZero() method to verify that a value
	// is set before using it.
	Created time.Time `json:"created,omitempty"`

	// ReadOnly is true if this image resides in a read-only layer store.
	ReadOnly bool `json:"-"`

	Flags map[string]interface{} `json:"flags,omitempty"`
}

type ImageBigDataOption struct {
	Key    string
	Data   []byte
	Digest digest.Digest
}

type ImageOptions struct {
	// CreationDate, if not zero, will override the default behavior of marking the image as having been
	// created when CreateImage() was called, recording CreationDate instead.
	CreationDate time.Time
	// Digest is a hard-coded digest value that we can use to look up the image.  It is optional.
	Digest digest.Digest
	// Digests is a list of digest values of the image's manifests, and
	// possibly a manually-specified value, that we can use to locate the
	// image.  If Digest is set, its value is also in this list.
	Digests []digest.Digest
	// Metadata is caller-specified metadata associated with the layer.
	Metadata string
	// BigData is a set of items which should be stored with the image.
	BigData []ImageBigDataOption
	// NamesHistory is used for guessing for what this image was named when a container was created based
	// on it, but it no longer has any names.
	NamesHistory []string
	// Flags is a set of named flags and their values to store with the image.  Currently these can only
	// be set when the image record is created, but that could change in the future.
	Flags map[string]interface{}
}

type Layer struct {
	// ID is either one which was specified at create-time, or a random
	// value which was generated by the library.
	ID string `json:"id"`

	// Names is an optional set of user-defined convenience values.  The
	// layer can be referred to by its ID or any of its names.  Names are
	// unique among layers.
	Names []string `json:"names,omitempty"`

	// Parent is the ID of a layer from which this layer inherits data.
	Parent string `json:"parent,omitempty"`

	// Metadata is data we keep for the convenience of the caller.  It is not
	// expected to be large, since it is kept in memory.
	Metadata string `json:"metadata,omitempty"`

	// MountLabel is an SELinux label which should be used when attempting to mount
	// the layer.
	MountLabel string `json:"mountlabel,omitempty"`

	// MountPoint is the path where the layer is mounted, or where it was most
	// recently mounted.
	//
	// WARNING: This field is a snapshot in time: (except for users inside c/storage that
	// hold the mount lock) the true value can change between subsequent
	// calls to c/storage API.
	//
	// Users that need to handle concurrent mount/unmount attempts should not access this
	// field at all, and should only use the path returned by .Mount() (and that’s only
	// assuming no other user will concurrently decide to unmount that mount point).
	MountPoint string `json:"-"`

	// MountCount is used as a reference count for the container's layer being
	// mounted at the mount point.
	//
	// WARNING: This field is a snapshot in time; (except for users inside c/storage that
	// hold the mount lock) the true value can change between subsequent
	// calls to c/storage API.
	//
	// In situations where concurrent mount/unmount attempts can happen, this field
	// should not be used for any decisions, maybe apart from heuristic user warnings.
	MountCount int `json:"-"`

	// Created is the datestamp for when this layer was created.  Older
	// versions of the library did not track this information, so callers
	// will likely want to use the IsZero() method to verify that a value
	// is set before using it.
	Created time.Time `json:"created,omitempty"`

	// CompressedDigest is the digest of the blob that was last passed to
	// ApplyDiff() or create(), as it was presented to us.
	CompressedDigest digest.Digest `json:"compressed-diff-digest,omitempty"`

	// CompressedSize is the length of the blob that was last passed to
	// ApplyDiff() or create(), as it was presented to us.  If
	// CompressedDigest is not set, this should be treated as if it were an
	// uninitialized value.
	CompressedSize int64 `json:"compressed-size,omitempty"`

	// UncompressedDigest is the digest of the blob that was last passed to
	// ApplyDiff() or create(), after we decompressed it.  Often referred to
	// as a DiffID.
	UncompressedDigest digest.Digest `json:"diff-digest,omitempty"`

	// TOCDigest represents the digest of the Table of Contents (TOC) of the blob.
	// This digest is utilized when the UncompressedDigest is not
	// validated during the partial image pull process, but the
	// TOC itself is validated.
	// It serves as an alternative reference under these specific conditions.
	TOCDigest digest.Digest `json:"toc-digest,omitempty"`

	// UncompressedSize is the length of the blob that was last passed to
	// ApplyDiff() or create(), after we decompressed it.  If
	// UncompressedDigest is not set, this should be treated as if it were
	// an uninitialized value.
	UncompressedSize int64 `json:"diff-size,omitempty"`

	// CompressionType is the type of compression which we detected on the blob
	// that was last passed to ApplyDiff() or create().
	CompressionType archive.Compression `json:"compression,omitempty"`

	// UIDs and GIDs are lists of UIDs and GIDs used in the layer.  This
	// field is only populated (i.e., will only contain one or more
	// entries) if the layer was created using ApplyDiff() or create().
	UIDs []uint32 `json:"uidset,omitempty"`
	GIDs []uint32 `json:"gidset,omitempty"`

	// Flags is arbitrary data about the layer.
	Flags map[string]interface{} `json:"flags,omitempty"`

	// UIDMap and GIDMap are used for setting up a layer's contents
	// for use inside of a user namespace where UID mapping is being used.
	UIDMap []idtools.IDMap `json:"uidmap,omitempty"`
	GIDMap []idtools.IDMap `json:"gidmap,omitempty"`

	// ReadOnly is true if this layer resides in a read-only layer store.
	ReadOnly bool `json:"-"`

	// BigDataNames is a list of names of data items that we keep for the
	// convenience of the caller.  They can be large, and are only in
	// memory when being read from or written to disk.
	BigDataNames []string `json:"big-data-names,omitempty"`
	// contains filtered or unexported fields
}

type LayerBigDataOption struct {
	Key  string
	Data io.Reader
}

type LayerOptions struct {
	// IDMappingOptions specifies the type of ID mapping which should be
	// used for this layer.  If nothing is specified, the layer will
	// inherit settings from its parent layer or, if it has no parent
	// layer, the Store object.
	types.IDMappingOptions
	// TemplateLayer is the ID of a layer whose contents will be used to
	// initialize this layer.  If set, it should be a child of the layer
	// which we want to use as the parent of the new layer.
	TemplateLayer string
	// OriginalDigest specifies a digest of the (possibly-compressed) tarstream (diff), if one is
	// provided along with these LayerOptions, and reliably known by the caller.
	// The digest might not be exactly the digest of the provided tarstream
	// (e.g. the digest might be of a compressed representation, while providing
	// an uncompressed one); in that case the caller is responsible for the two matching.
	// Use the default "" if this fields is not applicable or the value is not known.
	OriginalDigest digest.Digest
	// OriginalSize specifies a size of the (possibly-compressed) tarstream corresponding
	// to OriginalDigest.
	// If the digest does not match the provided tarstream, OriginalSize must match OriginalDigest,
	// not the tarstream.
	// Use nil if not applicable or not known.
	OriginalSize *int64
	// UncompressedDigest specifies a digest of the uncompressed version (“DiffID”)
	// of the tarstream (diff), if one is provided along with these LayerOptions,
	// and reliably known by the caller.
	// Use the default "" if this fields is not applicable or the value is not known.
	UncompressedDigest digest.Digest
	// True is the layer info can be treated as volatile
	Volatile bool
	// BigData is a set of items which should be stored with the layer.
	BigData []LayerBigDataOption
	// Flags is a set of named flags and their values to store with the layer.
	// Currently these can only be set when the layer record is created, but that
	// could change in the future.
	Flags map[string]interface{}
}

type RepairOptions struct {
	RemoveContainers bool // Remove damaged containers
}

type Store interface {
	// RunRoot, GraphRoot, GraphDriverName, and GraphOptions retrieve
	// settings that were passed to GetStore() when the object was created.
	RunRoot() string
	GraphRoot() string
	ImageStore() string
	TransientStore() bool
	GraphDriverName() string
	GraphOptions() []string
	PullOptions() map[string]string
	UIDMap() []idtools.IDMap
	GIDMap() []idtools.IDMap

	// GraphDriver obtains and returns a handle to the graph Driver object used
	// by the Store.
	GraphDriver() (drivers.Driver, error)

	// CreateLayer creates a new layer in the underlying storage driver,
	// optionally having the specified ID (one will be assigned if none is
	// specified), with the specified layer (or no layer) as its parent,
	// and with optional names.  (The writeable flag is ignored.)
	CreateLayer(id, parent string, names []string, mountLabel string, writeable bool, options *LayerOptions) (*Layer, error)

	// PutLayer combines the functions of CreateLayer and ApplyDiff,
	// marking the layer for automatic removal if applying the diff fails
	// for any reason.
	//
	// Note that we do some of this work in a child process.  The calling
	// process's main() function needs to import our pkg/reexec package and
	// should begin with something like this in order to allow us to
	// properly start that child process:
	//   if reexec.Init() {
	//       return
	//   }
	PutLayer(id, parent string, names []string, mountLabel string, writeable bool, options *LayerOptions, diff io.Reader) (*Layer, int64, error)

	// CreateImage creates a new image, optionally with the specified ID
	// (one will be assigned if none is specified), with optional names,
	// referring to a specified image, and with optional metadata.  An
	// image is a record which associates the ID of a layer with a
	// additional bookkeeping information which the library stores for the
	// convenience of its caller.
	CreateImage(id string, names []string, layer, metadata string, options *ImageOptions) (*Image, error)

	// CreateContainer creates a new container, optionally with the
	// specified ID (one will be assigned if none is specified), with
	// optional names, using the specified image's top layer as the basis
	// for the container's layer, and assigning the specified ID to that
	// layer (one will be created if none is specified).  A container is a
	// layer which is associated with additional bookkeeping information
	// which the library stores for the convenience of its caller.
	CreateContainer(id string, names []string, image, layer, metadata string, options *ContainerOptions) (*Container, error)

	// Metadata retrieves the metadata which is associated with a layer,
	// image, or container (whichever the passed-in ID refers to).
	Metadata(id string) (string, error)

	// SetMetadata updates the metadata which is associated with a layer,
	// image, or container (whichever the passed-in ID refers to) to match
	// the specified value.  The metadata value can be retrieved at any
	// time using Metadata, or using Layer, Image, or Container and reading
	// the object directly.
	SetMetadata(id, metadata string) error

	// Exists checks if there is a layer, image, or container which has the
	// passed-in ID or name.
	Exists(id string) bool

	// Status asks for a status report, in the form of key-value pairs,
	// from the underlying storage driver.  The contents vary from driver
	// to driver.
	Status() ([][2]string, error)

	// Delete removes the layer, image, or container which has the
	// passed-in ID or name.  Note that no safety checks are performed, so
	// this can leave images with references to layers which do not exist,
	// and layers with references to parents which no longer exist.
	Delete(id string) error

	// DeleteLayer attempts to remove the specified layer.  If the layer is the
	// parent of any other layer, or is referred to by any images, it will return
	// an error.
	DeleteLayer(id string) error

	// DeleteImage removes the specified image if it is not referred to by
	// any containers.  If its top layer is then no longer referred to by
	// any other images and is not the parent of any other layers, its top
	// layer will be removed.  If that layer's parent is no longer referred
	// to by any other images and is not the parent of any other layers,
	// then it, too, will be removed.  This procedure will be repeated
	// until a layer which should not be removed, or the base layer, is
	// reached, at which point the list of removed layers is returned.  If
	// the commit argument is false, the image and layers are not removed,
	// but the list of layers which would be removed is still returned.
	DeleteImage(id string, commit bool) (layers []string, err error)

	// DeleteContainer removes the specified container and its layer.  If
	// there is no matching container, or if the container exists but its
	// layer does not, an error will be returned.
	DeleteContainer(id string) error

	// Wipe removes all known layers, images, and containers.
	Wipe() error

	// MountImage mounts an image to temp directory and returns the mount point.
	// MountImage allows caller to mount an image. Images will always
	// be mounted read/only
	MountImage(id string, mountOptions []string, mountLabel string) (string, error)

	// Unmount attempts to unmount an image, given an ID.
	// Returns whether or not the layer is still mounted.
	// WARNING: The return value may already be obsolete by the time it is available
	// to the caller, so it can be used for heuristic sanity checks at best. It should almost always be ignored.
	UnmountImage(id string, force bool) (bool, error)

	// Mount attempts to mount a layer, image, or container for access, and
	// returns the pathname if it succeeds.
	// Note if the mountLabel == "", the default label for the container
	// will be used.
	//
	// Note that we do some of this work in a child process.  The calling
	// process's main() function needs to import our pkg/reexec package and
	// should begin with something like this in order to allow us to
	// properly start that child process:
	//   if reexec.Init() {
	//       return
	//   }
	Mount(id, mountLabel string) (string, error)

	// Unmount attempts to unmount a layer, image, or container, given an ID, a
	// name, or a mount path. Returns whether or not the layer is still mounted.
	// WARNING: The return value may already be obsolete by the time it is available
	// to the caller, so it can be used for heuristic sanity checks at best. It should almost always be ignored.
	Unmount(id string, force bool) (bool, error)

	// Mounted returns number of times the layer has been mounted.
	//
	// WARNING: This value might already be obsolete by the time it is returned;
	// In situations where concurrent mount/unmount attempts can happen, this field
	// should not be used for any decisions, maybe apart from heuristic user warnings.
	Mounted(id string) (int, error)

	// Changes returns a summary of the changes which would need to be made
	// to one layer to make its contents the same as a second layer.  If
	// the first layer is not specified, the second layer's parent is
	// assumed.  Each Change structure contains a Path relative to the
	// layer's root directory, and a Kind which is either ChangeAdd,
	// ChangeModify, or ChangeDelete.
	Changes(from, to string) ([]archive.Change, error)

	// DiffSize returns a count of the size of the tarstream which would
	// specify the changes returned by Changes.
	DiffSize(from, to string) (int64, error)

	// Diff returns the tarstream which would specify the changes returned
	// by Changes.  If options are passed in, they can override default
	// behaviors.
	Diff(from, to string, options *DiffOptions) (io.ReadCloser, error)

	// ApplyDiff applies a tarstream to a layer.  Information about the
	// tarstream is cached with the layer.  Typically, a layer which is
	// populated using a tarstream will be expected to not be modified in
	// any other way, either before or after the diff is applied.
	//
	// Note that we do some of this work in a child process.  The calling
	// process's main() function needs to import our pkg/reexec package and
	// should begin with something like this in order to allow us to
	// properly start that child process:
	//   if reexec.Init() {
	//       return
	//   }
	ApplyDiff(to string, diff io.Reader) (int64, error)

	// ApplyDiffer applies a diff to a layer.
	// It is the caller responsibility to clean the staging directory if it is not
	// successfully applied with ApplyDiffFromStagingDirectory.
	ApplyDiffWithDiffer(to string, options *drivers.ApplyDiffWithDifferOpts, differ drivers.Differ) (*drivers.DriverWithDifferOutput, error)

	// ApplyDiffFromStagingDirectory uses stagingDirectory to create the diff.
	// Deprecated: it will be removed soon.  Use ApplyStagedLayer instead.
	ApplyDiffFromStagingDirectory(to, stagingDirectory string, diffOutput *drivers.DriverWithDifferOutput, options *drivers.ApplyDiffWithDifferOpts) error

	// CleanupStagingDirectory cleanups the staging directory.  It can be used to cleanup the staging directory on errors
	// Deprecated: it will be removed soon.  Use CleanupStagedLayer instead.
	CleanupStagingDirectory(stagingDirectory string) error

	// ApplyStagedLayer combines the functions of CreateLayer and ApplyDiffFromStagingDirectory,
	// marking the layer for automatic removal if applying the diff fails
	// for any reason.
	ApplyStagedLayer(args ApplyStagedLayerOptions) (*Layer, error)

	// CleanupStagedLayer cleanups the staging directory.  It can be used to cleanup the staging directory on errors
	CleanupStagedLayer(diffOutput *drivers.DriverWithDifferOutput) error

	// DifferTarget gets the path to the differ target.
	DifferTarget(id string) (string, error)

	// LayersByCompressedDigest returns a slice of the layers with the
	// specified compressed digest value recorded for them.
	LayersByCompressedDigest(d digest.Digest) ([]Layer, error)

	// LayersByUncompressedDigest returns a slice of the layers with the
	// specified uncompressed digest value recorded for them.
	LayersByUncompressedDigest(d digest.Digest) ([]Layer, error)

	// LayersByTOCDigest returns a slice of the layers with the
	// specified TOC digest value recorded for them.
	LayersByTOCDigest(d digest.Digest) ([]Layer, error)

	// LayerSize returns a cached approximation of the layer's size, or -1
	// if we don't have a value on hand.
	LayerSize(id string) (int64, error)

	// LayerParentOwners returns the UIDs and GIDs of owners of parents of
	// the layer's mountpoint for which the layer's UID and GID maps (if
	// any are defined) don't contain corresponding IDs.
	LayerParentOwners(id string) ([]int, []int, error)

	// Layers returns a list of the currently known layers.
	Layers() ([]Layer, error)

	// Images returns a list of the currently known images.
	Images() ([]Image, error)

	// Containers returns a list of the currently known containers.
	Containers() ([]Container, error)

	// Names returns the list of names for a layer, image, or container.
	Names(id string) ([]string, error)

	// Free removes the store from the list of stores
	Free()

	// SetNames changes the list of names for a layer, image, or container.
	// Duplicate names are removed from the list automatically.
	// Deprecated: Prone to race conditions, suggested alternatives are `AddNames` and `RemoveNames`.
	SetNames(id string, names []string) error

	// AddNames adds the list of names for a layer, image, or container.
	// Duplicate names are removed from the list automatically.
	AddNames(id string, names []string) error

	// RemoveNames removes the list of names for a layer, image, or container.
	// Duplicate names are removed from the list automatically.
	RemoveNames(id string, names []string) error

	// ListImageBigData retrieves a list of the (possibly large) chunks of
	// named data associated with an image.
	ListImageBigData(id string) ([]string, error)

	// ImageBigData retrieves a (possibly large) chunk of named data
	// associated with an image.
	ImageBigData(id, key string) ([]byte, error)

	// ImageBigDataSize retrieves the size of a (possibly large) chunk
	// of named data associated with an image.
	ImageBigDataSize(id, key string) (int64, error)

	// ImageBigDataDigest retrieves the digest of a (possibly large) chunk
	// of named data associated with an image.
	ImageBigDataDigest(id, key string) (digest.Digest, error)

	// SetImageBigData stores a (possibly large) chunk of named data
	// associated with an image.  Pass
	// github.com/containers/image/manifest.Digest as digestManifest to
	// allow ImagesByDigest to find images by their correct digests.
	SetImageBigData(id, key string, data []byte, digestManifest func([]byte) (digest.Digest, error)) error

	// ImageDirectory returns a path of a directory which the caller can
	// use to store data, specific to the image, which the library does not
	// directly manage.  The directory will be deleted when the image is
	// deleted.
	ImageDirectory(id string) (string, error)

	// ImageRunDirectory returns a path of a directory which the caller can
	// use to store data, specific to the image, which the library does not
	// directly manage.  The directory will be deleted when the host system
	// is restarted.
	ImageRunDirectory(id string) (string, error)

	// ListLayerBigData retrieves a list of the (possibly large) chunks of
	// named data associated with a layer.
	ListLayerBigData(id string) ([]string, error)

	// LayerBigData retrieves a (possibly large) chunk of named data
	// associated with a layer.
	LayerBigData(id, key string) (io.ReadCloser, error)

	// SetLayerBigData stores a (possibly large) chunk of named data
	// associated with a layer.
	SetLayerBigData(id, key string, data io.Reader) error

	// ImageSize computes the size of the image's layers and ancillary data.
	ImageSize(id string) (int64, error)

	// ListContainerBigData retrieves a list of the (possibly large) chunks of
	// named data associated with a container.
	ListContainerBigData(id string) ([]string, error)

	// ContainerBigData retrieves a (possibly large) chunk of named data
	// associated with a container.
	ContainerBigData(id, key string) ([]byte, error)

	// ContainerBigDataSize retrieves the size of a (possibly large)
	// chunk of named data associated with a container.
	ContainerBigDataSize(id, key string) (int64, error)

	// ContainerBigDataDigest retrieves the digest of a (possibly large)
	// chunk of named data associated with a container.
	ContainerBigDataDigest(id, key string) (digest.Digest, error)

	// SetContainerBigData stores a (possibly large) chunk of named data
	// associated with a container.
	SetContainerBigData(id, key string, data []byte) error

	// ContainerSize computes the size of the container's layer and ancillary
	// data.  Warning:  this is a potentially expensive operation.
	ContainerSize(id string) (int64, error)

	// Layer returns a specific layer.
	Layer(id string) (*Layer, error)

	// Image returns a specific image.
	Image(id string) (*Image, error)

	// ImagesByTopLayer returns a list of images which reference the specified
	// layer as their top layer.  They will have different IDs and names
	// and may have different metadata, big data items, and flags.
	ImagesByTopLayer(id string) ([]*Image, error)

	// ImagesByDigest returns a list of images which contain a big data item
	// named ImageDigestBigDataKey whose contents have the specified digest.
	ImagesByDigest(d digest.Digest) ([]*Image, error)

	// Container returns a specific container.
	Container(id string) (*Container, error)

	// ContainerByLayer returns a specific container based on its layer ID or
	// name.
	ContainerByLayer(id string) (*Container, error)

	// ContainerDirectory returns a path of a directory which the caller
	// can use to store data, specific to the container, which the library
	// does not directly manage.  The directory will be deleted when the
	// container is deleted.
	ContainerDirectory(id string) (string, error)

	// SetContainerDirectoryFile is a convenience function which stores
	// a piece of data in the specified file relative to the container's
	// directory.
	SetContainerDirectoryFile(id, file string, data []byte) error

	// FromContainerDirectory is a convenience function which reads
	// the contents of the specified file relative to the container's
	// directory.
	FromContainerDirectory(id, file string) ([]byte, error)

	// ContainerRunDirectory returns a path of a directory which the
	// caller can use to store data, specific to the container, which the
	// library does not directly manage.  The directory will be deleted
	// when the host system is restarted.
	ContainerRunDirectory(id string) (string, error)

	// SetContainerRunDirectoryFile is a convenience function which stores
	// a piece of data in the specified file relative to the container's
	// run directory.
	SetContainerRunDirectoryFile(id, file string, data []byte) error

	// FromContainerRunDirectory is a convenience function which reads
	// the contents of the specified file relative to the container's run
	// directory.
	FromContainerRunDirectory(id, file string) ([]byte, error)

	// ContainerParentOwners returns the UIDs and GIDs of owners of parents
	// of the container's layer's mountpoint for which the layer's UID and
	// GID maps (if any are defined) don't contain corresponding IDs.
	ContainerParentOwners(id string) ([]int, []int, error)

	// Lookup returns the ID of a layer, image, or container with the specified
	// name or ID.
	Lookup(name string) (string, error)

	// Shutdown attempts to free any kernel resources which are being used
	// by the underlying driver.  If "force" is true, any mounted (i.e., in
	// use) layers are unmounted beforehand.  If "force" is not true, then
	// layers being in use is considered to be an error condition.  A list
	// of still-mounted layers is returned along with possible errors.
	Shutdown(force bool) (layers []string, err error)

	// Version returns version information, in the form of key-value pairs, from
	// the storage package.
	Version() ([][2]string, error)

	// GetDigestLock returns digest-specific Locker.
	GetDigestLock(digest.Digest) (Locker, error)

	// LayerFromAdditionalLayerStore searches the additional layer store and returns an object
	// which can create a layer with the specified digest associated with the specified image
	// reference. Note that this hasn't been stored to this store yet: the actual creation of
	// a usable layer is done by calling the returned object's PutAs() method.  After creating
	// a layer, the caller must then call the object's Release() method to free any temporary
	// resources which were allocated for the object by this method or the object's PutAs()
	// method.
	// This API is experimental and can be changed without bumping the major version number.
	LookupAdditionalLayer(d digest.Digest, imageref string) (AdditionalLayer, error)

	// Tries to clean up remainders of previous containers or layers that are not
	// references in the json files. These can happen in the case of unclean
	// shutdowns or regular restarts in transient store mode.
	GarbageCollect() error

	// Check returns a report of things that look wrong in the store.
	Check(options *CheckOptions) (CheckReport, error)
	// Repair attempts to remediate problems mentioned in the CheckReport,
	// usually by deleting layers and images which are damaged.  If the
	// right options are set, it will remove containers as well.
	Repair(report CheckReport, options *RepairOptions) []error
}

type StoreOptions = types.StoreOptions