[Samba] Deleting undeletable files gives no error

[David Shaw]

I have an odd problem that involves clients deleting files they should
not be able to delete, and claiming success, but then the files "come
back" again.

Here's the setup: I have a filesystem that contains a file
"foobar.txt" owned by user "test", group "test".  Permissions on this
file are 644, permissions on the enclosing directory are 777.

I share this filesystem via samba (version 3.0.20), using this config:

[test]
   path=/mnt/test
   writable = yes
   browsable = yes
   hide dot files = yes
   wide links = no
   delete readonly = yes
   guest ok = yes
   guest only = yes
   force create mode = 400
   force directory mode = 700
   force user = test
   force group = test

I mount this share on an XP box.  I delete foobar.txt.  It works and
all is well.

Then I do the same exact test except mount /mnt/test readonly.  Now,
when I delete foobar.txt, it seems to work, but refreshing the XP
window or doing "dir" again shows the file wan't actually deleted.
Obviously you can't delete a file off of a readonly filesystem, but
(and here's the problem) shouldn't there have been an error message
given?  The delete failed, but the user wasn't informed.

David