Feature: preserve modes better, especially on block/character devices in iso-cp

[rocky]

Consider this output

$ ./iso-ls ../../tests/data/rock-ridge.iso 
/:
  dr-xr-xr-x   4 0 0 [LSN     23]      2048 Oct 21 2004 22:21:14 .
  dr-xr-xr-x   2 0 0 [LSN     23]      2048 Oct 21 2004 22:21:14 ..
  dr-xr-xr-x   2 0 0 [LSN     24]      2048 Mar 05 2005 12:12:25 copy
  lr-xr-xr-x   1 0 0 [LSN     27]         7 Mar 05 2005 11:26:00 Copy2 -> COPYING
  -r--r--r--   1 0 0 [LSN     27]     17992 Mar 05 2005 11:25:51 COPYING
  br--r--r--   1 0 0 [LSN     36]         0 Mar 05 2005 11:32:05 fd0
  dr-xr-xr-x   2 0 0 [LSN     25]      2048 Mar 05 2005 12:12:25 tmp
  cr--r--r--   1 0 0 [LSN     36]         0 Mar 05 2005 11:31:42 zero

/copy/:
  dr-xr-xr-x   2 0 0 [LSN     24]      2048 Mar 05 2005 12:12:25 .
  dr-xr-xr-x   4 0 0 [LSN     23]      2048 Mar 05 2005 12:12:25 ..
  lr-xr-xr-x   1 0 0 [LSN     36]        10 Mar 05 2005 11:27:05 COPYING -> ../COPYING

/tmp/:
  dr-xr-xr-x   2 0 0 [LSN     25]      2048 Mar 05 2005 12:12:25 .
  dr-xr-xr-x   4 0 0 [LSN     23]      2048 Mar 05 2005 12:12:25 ..
  lr-xr-xr-x   1 0 0 [LSN     36]        18 Mar 05 2005 11:51:05 COPYING -> ../copying/COPYING

In the above we have both a block device fd0 and a character device zero listed. If this are copied, these attributes disappear:

$ iso-cp ../../tests/data/rock-ridge.iso zero /tmp/my-zero
$ ls -l /tmp/my-zero 
-rw-rw-r-- 1 rocky rocky 0 Aug 25 06:15 /tmp/my-zero

And it does not look like like the mode permissions +r-w are preserved either.

I note that this is a misfeature of libcdio's iso-copy as well.