use gobindata

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/docker/docker/image/rootfs.go

@@ -0,0 +1,52 @@
+package image // import "github.com/docker/docker/image"
+
+import (
+	"runtime"
+
+	"github.com/docker/docker/layer"
+	"github.com/sirupsen/logrus"
+)
+
+// TypeLayers is used for RootFS.Type for filesystems organized into layers.
+const TypeLayers = "layers"
+
+// typeLayersWithBase is an older format used by Windows up to v1.12. We
+// explicitly handle this as an error case to ensure that a daemon which still
+// has an older image like this on disk can still start, even though the
+// image itself is not usable. See https://github.com/docker/docker/pull/25806.
+const typeLayersWithBase = "layers+base"
+
+// RootFS describes images root filesystem
+// This is currently a placeholder that only supports layers. In the future
+// this can be made into an interface that supports different implementations.
+type RootFS struct {
+	Type    string         `json:"type"`
+	DiffIDs []layer.DiffID `json:"diff_ids,omitempty"`
+}
+
+// NewRootFS returns empty RootFS struct
+func NewRootFS() *RootFS {
+	return &RootFS{Type: TypeLayers}
+}
+
+// Append appends a new diffID to rootfs
+func (r *RootFS) Append(id layer.DiffID) {
+	r.DiffIDs = append(r.DiffIDs, id)
+}
+
+// Clone returns a copy of the RootFS
+func (r *RootFS) Clone() *RootFS {
+	newRoot := NewRootFS()
+	newRoot.Type = r.Type
+	newRoot.DiffIDs = append(r.DiffIDs)
+	return newRoot
+}
+
+// ChainID returns the ChainID for the top layer in RootFS.
+func (r *RootFS) ChainID() layer.ChainID {
+	if runtime.GOOS == "windows" && r.Type == typeLayersWithBase {
+		logrus.Warnf("Layer type is unsupported on this platform. DiffIDs: '%v'", r.DiffIDs)
+		return ""
+	}
+	return layer.CreateChainID(r.DiffIDs)
+}