Added to copy module: Error handling for missing permissions on the copy destination

copy

@@ -66,6 +66,12 @@ if dest:
 if not os.path.exists(src):
 	exit_kv(rc=1, failed=1, msg="Source %s failed to transfer" % (src))
 
+# raise an error if copy has no permission on dest
+if not os.access(dest, os.W_OK):
+    exit_kv(rc=1, failed=1, msg="Destination %s seems not writable" % (dest))
+elif not os.access(dest, os.R_OK):
+    exit_kv(rc=1, failed=1, msg="Destination %s seems not readable" % (dest))
+
 md5sum = None
 changed = False
 if os.path.exists(dest):