diff --git a/poky/bitbake/lib/bb/cache.py b/poky/bitbake/lib/bb/cache.py
index 92e9a3c..988c596 100644
--- a/poky/bitbake/lib/bb/cache.py
+++ b/poky/bitbake/lib/bb/cache.py
@@ -24,6 +24,7 @@
 import bb.utils
 from bb import PrefixLoggerAdapter
 import re
+import shutil
 
 logger = logging.getLogger("BitBake.Cache")
 
@@ -998,3 +999,11 @@
             p.dump([data, self.cacheversion])
 
         bb.utils.unlockfile(glf)
+
+    def copyfile(self, target):
+        if not self.cachefile:
+            return
+
+        glf = bb.utils.lockfile(self.cachefile + ".lock")
+        shutil.copy(self.cachefile, target)
+        bb.utils.unlockfile(glf)