Vendor latest github.com/containers/storage

Update github.com/containers/storage to master(06b6c2e4cf254f5922a79da058c94ac2a65bb92f).

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

vendor/github.com/containers/storage/drivers/template.go

@@ -0,0 +1,45 @@
+package graphdriver
+
+import (
+	"github.com/sirupsen/logrus"
+
+	"github.com/containers/storage/pkg/idtools"
+)
+
+// TemplateDriver is just barely enough of a driver that we can implement a
+// naive version of CreateFromTemplate on top of it.
+type TemplateDriver interface {
+	DiffDriver
+	CreateReadWrite(id, parent string, opts *CreateOpts) error
+	Create(id, parent string, opts *CreateOpts) error
+	Remove(id string) error
+}
+
+// CreateFromTemplate creates a layer with the same contents and parent as
+// another layer.  Internally, it may even depend on that other layer
+// continuing to exist, as if it were actually a child of the child layer.
+func NaiveCreateFromTemplate(d TemplateDriver, id, template string, templateIDMappings *idtools.IDMappings, parent string, parentIDMappings *idtools.IDMappings, opts *CreateOpts, readWrite bool) error {
+	var err error
+	if readWrite {
+		err = d.CreateReadWrite(id, parent, opts)
+	} else {
+		err = d.Create(id, parent, opts)
+	}
+	if err != nil {
+		return err
+	}
+	diff, err := d.Diff(template, templateIDMappings, parent, parentIDMappings, opts.MountLabel)
+	if err != nil {
+		if err2 := d.Remove(id); err2 != nil {
+			logrus.Errorf("error removing layer %q: %v", id, err2)
+		}
+		return err
+	}
+	if _, err = d.ApplyDiff(id, templateIDMappings, parent, opts.MountLabel, diff); err != nil {
+		if err2 := d.Remove(id); err2 != nil {
+			logrus.Errorf("error removing layer %q: %v", id, err2)
+		}
+		return err
+	}
+	return nil
+}