X-Recipient:	archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status:	No, hits=2.9 required=5.0 tests=AWL,BAYES_50,DKIM_ADSP_CUSTOM_MED,FORGED_YAHOO_RCVD,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED,RP_MATCHES_RCVD,TW_MK,T_TO_NO_BRKTS_FREEMAIL
X-Spam-Check-By:	sourceware.org
Message-ID:	<32576391.post@talk.nabble.com>
Date:	Sat, 1 Oct 2011 19:36:49 -0700 (PDT)
From:	gsingh93 <gsingh_2011 AT yahoo DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Different commands give different groups
In-Reply-To:	<4E871BAF.3040106@redhat.com>
MIME-Version:	1.0
References:	<32572751 DOT post AT talk DOT nabble DOT com> <4E871BAF DOT 3040106 AT redhat DOT com>
X-IsSubscribed:	yes
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Unsubscribe:	<mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com

That makes sense, but I've completely restarted my computer and yet it still
shows the old groups. So a new process that uses the new groups hasn't
started. Any idea why?

eblake wrote:
> 
> On 09/30/2011 09:49 PM, gsingh93 wrote:
>>
>> Why do these two commands give different groups? It's the same user.
> 
> Because the effective gid set for the existing process differs from the 
> recorded groups in /etc/groups - most likely, you've changed /etc/groups 
> but haven't logged out and back in to start a new process hierarchy that 
> uses the new groups.
> 
>>
>> Gulshan AT GSJK-PC /etc
>> $ id Gulshan
>> uid=1000(Gulshan) gid=545(Users) groups=545(Users),0(root)
> 
> That's what the groups will be if a new process is started for Gulshan.
> 
>>
>> Gulshan AT GSJK-PC /etc
>> $ id
>> uid=1000(Gulshan) gid=545(Users) groups=545(Users),513(None)
> 
> Whereas that's what the groups are now for the current process.
> 
> This aspect of your situation is not cygwin-specific, the same behavior 
> can be observed in other OSs when you change the user database after a 
> particular user already has a process started.
> 
>>
>> Furthermore, the commands mkgroup and mkpasswd give the orginial states
>> of
>> their corresponding files instead of what I changed them to. Why is that?
> 
> This part is cygwin-specific - and the answer is that mkgroup and 
> mkpasswd are querying Window's database of user information, not /etc 
> (so that you can then populate /etc with information that matches the 
> Window's database).  Windows doesn't care what you put in /etc, so the 
> amount of changes you can make in those files that still have a 
> worthwhile visible effect to cygwin processes is a bit limited.
> 
> -- 
> Eric Blake   eblake AT redhat DOT com    +1-801-349-2682
> Libvirt virtualization library http://libvirt.org
> 
> --
> Problem reports:       http://cygwin.com/problems.html
> FAQ:                   http://cygwin.com/faq/
> Documentation:         http://cygwin.com/docs.html
> Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
> 
> 
> 

-- 
View this message in context: http://old.nabble.com/Different-commands-give-different-groups-tp32572751p32576391.html
Sent from the Cygwin list mailing list archive at Nabble.com.


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -