Problem with "None" Group on Non-Domain Members

Mon May 5 14:17:00 GMT 2014

Corinna Vinschen wrote:
> On May 5 09:49, Chris J. Breisch wrote:
> As far as Cygwin tools are concerned, the None group is just a normal
> group like any other group. The behaviour you're observing looks a bit
> like either your group file is not ok, or you're testing this with the
> noacl mount option. Or, probably more likely, you're suffereing from
> the default ACL settings propagated from the parent directory.
>> When Cygwin sets the POSIX permissions, it does exactly the same thing
> for the primary group in your token, whether it's None or any other
> group.
>>I understand what you're saying, but I don't think the behavior agrees 
with your statements. I've tried this on a couple different machines, 
and the behavior is identical. No matter what I do, if a file is created 
with the "None" group, the group file permissions are always identical 
to the owner file permissions. I've tried playing with my umask and with 
directory sticky bits. It doesn't matter. In the example above, my 
parent directory is rather oddly, Chris.Users 000. The current directory 
is Chris.None 775.
$ ls -ld . ..
drwxrwxr-x+ 1 Chris None 0 May 5 10:05 ./
d---------+ 1 Chris Users 0 May 5 09:35 ../
And again, changing the permissions of the directory doesn't accomplish 
anything:
$ chmod 755 .
$ ls -ld . ..
drwxrwxr-x+ 1 Chris None 0 May 5 10:08 ./
d---------+ 1 Chris Users 0 May 5 10:08 ../
Changing the group for the directory doesn't help either:
$ chgrp Users .
$ touch bar
$ ls -l bar
-rw-rw-r-- 1 Chris None 0 May 5 10:10 bar
$ chmod 600 bar
$ ls -l bar
-rw-rw---- 1 Chris None 0 May 5 10:10 bar
$ ls -ld . ..
drwxrwxr-x+ 1 Chris Users 0 May 5 10:10 ./
d---------+ 1 Chris Users 0 May 5 10:08 ../
Taking the example one step farther:
$ chmod 600 bar
$ ls -l bar
-rw-rw---- 1 Chris None 0 May 5 10:10 bar
$ chmod 400 bar
$ ls -l bar
-r--r----- 1 Chris None 0 May 5 10:10 bar
And changing the group from "None" to anything else always fixes the 
permission issues. chmod and umask suddenly start working as expected.
-- 
Chris J. Breisch
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