File and directory permissions in windows

[Tim Golden]

[ismael]
| My objective is check if some directories exist and if the 
| user that execute the perl script has access to some files 
| and directories. If one of this checkpoints failed the 
| execution will be aborted. If all of then finish ok
| the execution will continue. It's simply this.

I think you've got two options:

1) Invest some time in understanding the Win32 security
model -- which is quite a bit more complex than the
(default) Posix model. You'll need to use the win32security
module or some ctypes code and see if the logged-on user
has the necessary permissions on the file of your choice.

or

2) Do it anyway, wrap it in a try-except block and catch
the OSError exception (or whatever exception it is). That
could be for several reasons, but I suspect that you don't
really care *why* this user can't execute, merely that he
can't. 

NB This appraoch is generally well-regarded under Python.
In theory between the time you check the permissions and
the execution of the script something could happen which
changes the situation. If you simply trap any exceptions,
you'll always be timely.

<code - a but crude and entirely untested>
import os

path_i_cant_access = r"\\vogbs022\it\canadasp"

try:
  result = os.listdir (path_i_cant_access)
except OSError:
  print "Couldn't read, or something else happened"
else:
  print "The result was", result

</code>

Hope that helps
TJG

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