Don't try to backup authorized_keys (and thus fail) if the file doesn't exist.

tmcd/common/config/rc.localize

 #!/usr/bin/perl -w
 #
 # EMULAB-COPYRIGHT
-# Copyright (c) 2004 University of Utah and the Flux Group.
+# Copyright (c) 2004, 2005 University of Utah and the Flux Group.
 # All rights reserved.
 #
 use English;
@@ -124,8 +124,10 @@ sub doboot()
 	my $authkeys  = "/root/.ssh/authorized_keys";
 	my $authkeys2 = "/root/.ssh/authorized_keys2";
 	
-	system("cp -pf $authkeys $authkeys2") == 0
-	    or fatal("Could not backup root ssh authorized_keys file");
+	if (-e "$authkeys") {
+	    system("cp -pf $authkeys $authkeys2") == 0
+		or fatal("Could not backup root ssh authorized_keys file");
+	}
 
 	if (!open(AUTHKEYS, "> ${authkeys}.new")) {
 	    warning("Could not open ${authkeys}.new: $!");