WinXP host, Ubuntu 9.04 guest, "mv -f file1 file2" fails on shared folder without write permissions on file2

[David]

Test case:

touch file1 file2 chmod a-w file2 mv -f file1 file2

On the guest disk, there is no message whatsoever and file2 is replaced by file1. This is the behavior I expect.

On a shared folder pointing to a directory on the host's local hard disk drive, I get this error from the mv command and file1 remains:

mv: cannot move file1' to file2': Operation not permitted

When the shared folder is pointing to a network drive, I get this error from the mv command and file1 remains:

mv: cannot move file1' to file2': File exists