Unionfs move directory problems

[GW]

GW wrote:
> For the second problem:
> - in all cases (option whiteout=always or whenneeded) when new 
> directories get created unionfs should check whether such a directory 
> exists in the lower layer and automaticly whiteout all of its entries

- or better (can not work for more than 2 layers) copying all files to 
upper layer in the moved directory and set the opaque flag, so that 
underlying files under the new directory name can't be seen through


This is the way it is done on the end of the following scenario...

First a little different PROBLEM 1 again:
~# mkdir ro ro/foo ro/foo/moveme rw
~# touch ro/foo/moveme/file1
~# touch ro/foo/moveme/file2
~# ls -aFloWi orig
~# mount -t unionfs -o below ro rw
~# cd rw
~/rw# ls -aFloWi
total 6
49876 drwx------  3 root  wheel  - 512 Aug 12 03:10 ./
49872 drwx------  4 root  wheel  - 512 Aug 12 03:09 ../
49879 drwx------  2 root  wheel  - 512 Aug 12 03:09 foo/
~/rw# ls -aFloWi foo/
total 6
49879 drwx------  2 root  wheel  - 512 Aug 12 03:09 ./
49876 drwx------  3 root  wheel  - 512 Aug 12 03:10 ../
49880 drwx------  2 root  wheel  - 512 Aug 12 03:10 moveme/
~/rw# ls -aFloWi foo/moveme/
total 4
49880 drwx------  2 root  wheel  - 512 Aug 12 03:10 ./
49879 drwx------  3 root  wheel  - 512 Aug 12 03:10 ../
49877 -rw-------  1 root  wheel  -   0 Aug 12 03:10 file1
49878 -rw-------  1 root  wheel  -   0 Aug 12 03:10 file2
~/rw# mv foo/moveme/ .
~/rw# ls -aFloWi
total 8
49876 drwx------  4 root  wheel  - 512 Aug 12 03:11 ./
49872 drwx------  4 root  wheel  - 512 Aug 12 03:09 ../
49879 drwx------  2 root  wheel  - 512 Aug 12 03:10 foo/
49880 drwx------  2 root  wheel  - 512 Aug 12 03:10 moveme/
~/rw# ls -aFloWi foo
total 4
49879 drwx------  2 root  wheel  - 512 Aug 12 03:10 ./
49876 drwx------  4 root  wheel  - 512 Aug 12 03:11 ../
     0 w---------  0 root  wheel  -   0 Jan  1  1970 moveme%
~/rw# ls -aFloWi moveme/
total 4
49880 drwx------  2 root  wheel  - 512 Aug 12 03:10 ./
49876 drwx------  4 root  wheel  - 512 Aug 12 03:11 ../

<< again PROBLEM 1, nothing new

And now behavour that is a good solution for PROBLEM 2:
~/rw# mkdir foo/moveme
~/rw# ls -aFloWi foo/
total 6
49879 drwx------  3 root  wheel  -      512 Aug 12 03:14 ./
49876 drwx------  4 root  wheel  -      512 Aug 12 03:11 ../
49881 drwx------  2 root  wheel  opaque 512 Aug 12 03:14 moveme/
~/rw# ls -aFloWi foo/moveme/
total 4
49881 drwx------  2 root  wheel  opaque 512 Aug 12 03:14 ./
49879 drwx------  3 root  wheel  -      512 Aug 12 03:14 ../

To proove that the opaque flag did the trick:
~/rw# chflags noopaque foo/moveme/
~/rw# ls -aFloWi foo/moveme/
total 4
49881 drwx------  2 root  wheel  - 512 Aug 12 03:14 ./
49879 drwx------  3 root  wheel  - 512 Aug 12 03:14 ../
49877 -rw-------  1 root  wheel  -   0 Aug 12 03:10 file1
49878 -rw-------  1 root  wheel  -   0 Aug 12 03:10 file2


   gw