const (
	// TargetSnapshotRef is the interface to know that Prepare
	// action is to pull image, not for container Writable snapshot.
	//
	// NOTE: Only available in >= containerd 1.4.0 and containerd.Pull
	// with Unpack option.
	//
	// FIXME(fuweid): With containerd design, we don't know that what purpose
	// snapshotter.Prepare does for. For unpacked image, prepare is for
	// container's rootfs. For pulling image, the prepare is for committed.
	// With label "containerd.io/snapshot.ref" in preparing, snapshotter
	// author will know it is for pulling image. It will be useful.
	//
	// The label is only propagated during pulling image. So, is it possible
	// to propagate by image.Unpack()?
	TargetSnapshotRef = "containerd.io/snapshot.ref"

	// TargetImageRef is the label to mark where the snapshot comes from.
	//
	// TODO(fuweid): Is it possible to use it in upstream?
	TargetImageRef = "containerd.io/snapshot/image-ref"

	// OverlayBDBlobDigest is the annotation key in the manifest to
	// describe the digest of blob in OverlayBD format.
	//
	// NOTE: The annotation is part of image layer blob's descriptor.
	OverlayBDBlobDigest = "containerd.io/snapshot/overlaybd/blob-digest"

	// OverlayBDBlobSize is the annotation key in the manifest to
	// describe the size of blob in OverlayBD format.
	//
	// NOTE: The annotation is part of image layer blob's descriptor.
	OverlayBDBlobSize = "containerd.io/snapshot/overlaybd/blob-size"

	// OverlayBDBlobFsType is the annotation key in the manifest to
	// describe the filesystem type to be mounted as of blob in OverlayBD format.
	//
	// NOTE: The annotation is part of image layer blob's descriptor.
	OverlayBDBlobFsType = "containerd.io/snapshot/overlaybd/blob-fs-type"

	// AccelerationLayer is the annotation key in the manifest to indicate
	// whether a top layer is acceleration layer or not.
	AccelerationLayer = "containerd.io/snapshot/overlaybd/acceleration-layer"

	// RecordTrace tells snapshotter to record trace
	RecordTrace = "containerd.io/snapshot/overlaybd/record-trace"

	// RecordTracePath is the file path to record trace
	RecordTracePath = "containerd.io/snapshot/overlaybd/record-trace-path"

	// ZFileConfig is the config of ZFile
	ZFileConfig = "containerd.io/snapshot/overlaybd/zfile-config"

	// OverlayBD virtual block device size
	OverlayBDVsize = "containerd.io/snapshot/overlaybd/vsize"

	// CRIImageRef is the image-ref from cri
	CRIImageRef = "containerd.io/snapshot/cri.image-ref"

	// TurboOCIDigest is the index annotation key for image layer digest
	FastOCIDigest  = "containerd.io/snapshot/overlaybd/fastoci/target-digest" // legacy
	TurboOCIDigest = "containerd.io/snapshot/overlaybd/turbo-oci/target-digest"

	// TurboOCIMediaType is the index annotation key for image layer media type
	FastOCIMediaType  = "containerd.io/snapshot/overlaybd/fastoci/target-media-type" // legacy
	TurboOCIMediaType = "containerd.io/snapshot/overlaybd/turbo-oci/target-media-type"

	// DownloadRemoteBlob is a label for download remote blob
	DownloadRemoteBlob = "containerd.io/snapshot/overlaybd/download-remote-blob"

	RemoteLabel    = "containerd.io/snapshot/remote"
	RemoteLabelVal = "remote snapshot"

	// OverlayBDVersion is the version number of overlaybd blob
	OverlayBDVersion = "containerd.io/snapshot/overlaybd/version"

	// LayerToTurboOCI is used to convert local layer to turboOCI with tar index
	LayerToTurboOCI = "containerd.io/snapshot/overlaybd/convert2turbo-oci"

	SnapshotType = "containerd.io/snapshot/type"

	// RootfsQuotaLabel sets container rootfs diskquota
	RootfsQuotaLabel = "containerd.io/snapshot/disk_quota"
)

const (
	// SupportReadWriteMode is used to support writable block device
	// for active snapshotter.
	//
	// By default, multiple active snapshotters can share one block device
	// from parent snapshotter(committed). Like image builder and
	// sandboxed-like container runtime(KataContainer, Firecracker), those
	// cases want to use the block device alone or as writable.
	// There are two ways to provide writable devices:
	//  - 'dir' mark the snapshotter
	//    as wriable block device and mount it on rootfs.
	//  - 'dev' mark the snapshotter
	//    as wriable block device without mount.
	SupportReadWriteMode = "containerd.io/snapshot/overlaybd.writable"

	// LocalOverlayBDPath is used to export the commit file path.
	//
	// NOTE: Only used in image build.
	LocalOverlayBDPath = "containerd.io/snapshot/overlaybd.localcommitpath"
)

var OverlayBDAnnotations = []string{
	LocalOverlayBDPath,
	OverlayBDBlobDigest,
	OverlayBDBlobSize,
	OverlayBDBlobFsType,
}