layerStore.Put(): update digest-based indexes when creating from templates

When we're creating a layer using another layer as a template, add the
new layer's uncompressed and compressed digest to the maps we use to
index layers using those digests.

When we forgot to do that, searching for a layer by either would still
turn up the original template, so this didn't really break anything.

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

layers.go

@@ -866,6 +866,14 @@ func (r *layerStore) Put(id string, parentLayer *Layer, names []string, mountLab
 				return nil, -1, err
 			}
 			delete(layer.Flags, incompleteFlag)
+		} else {
+			// applyDiffWithOptions in the `diff != nil` case handles this bit for us
+			if layer.CompressedDigest != "" {
+				r.bycompressedsum[layer.CompressedDigest] = append(r.bycompressedsum[layer.CompressedDigest], layer.ID)
+			}
+			if layer.UncompressedDigest != "" {
+				r.byuncompressedsum[layer.UncompressedDigest] = append(r.byuncompressedsum[layer.UncompressedDigest], layer.ID)
+			}
 		}
 		err = r.Save()
 		if err != nil {