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Message-ID:	<43121988.A55F8EE8@dessent.net>
Date:	Sun, 28 Aug 2005 13:07:36 -0700
From:	Brian Dessent <brian AT dessent DOT net>
MIME-Version:	1.0
To:	cygwin AT cygwin DOT com
Subject:	Re: perlcc and permissions
References:	<0B9EBBE7CA79D7118FD00002B3B2B9B910ECD62D AT nm75ex51 DOT das DOT honeywell DOT com>
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Reply-To:	cygwin AT cygwin DOT com

"Baksik, Frederick (NM75)" wrote:

(Disclaimer - I'm no expert on this stuff)

> # owner: Administrators
> # group: Domain Users
> user::rw-
> group::---
> mask:rwx
> other:---
> 
> e728075 AT DAS-FBAKSIK ~
> $ perl -ne 'print "hi: ", $_' new.pl
> hi: print "hello world\n"

Is 'e728075' a member of the Administrators group?  If so then you are
the owner of the file and should have r/w permission.  However, your UID
does not equal the UID specified in the ACL of the file (Administrators,
544) and so any program that only knows about straight posix permissions
would not consider you the owner.  In posix world the owner is a single
user and can't be a group.

> $ ls -l new.pl
> -rw-------  1 sshd Domain Users 22 Aug 28 13:04 new.pl
> 
> e728075 AT DAS-FBAKSIK ~
> $ cat new.pl
> cat: new.pl: Permission denied

Here you are no longer the owner of the file and so you have no
permissions.

I think it's really just a demonstration of how the two different
permission systems don't always map onto each other exactly.  I think
this has come up before and someone even pointed out that there's a
variable you can set in Perl to tell it not to try to check posix
permissions but instead to just try accessing the file.  Or something
like that.  I don't remember the details.

Brian

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