Only check one level of children

Author: davidcollom

pkg/api/types.go

@@ -26,7 +26,7 @@ func (i *ImageTag) MatchesSHA(sha string) bool {
 		return true
 	}
 	for _, known := range i.Children {
-		if known.MatchesSHA(sha) {
+		if known.SHA == sha {
 			return true
 		}
 	}