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Date: Fri, 14 Mar 2014 20:38:23 +0400
From: Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To: cygwin AT cygwin DOT com
Message-ID: <692018215.20140314203823@yandex.ru>
To: Corinna Vinschen <cygwin AT cygwin DOT com>
Subject: Re: Getting groups you belong to in perl
In-Reply-To: <20140314163026.GB2355@calimero.vinschen.de>
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Greetings, Corinna Vinschen!

>> >>> Don't know if this list is more appropriate than the Perl one but my
>> >>> question is actually about porting a Perl script to Cygwin. I need to
>> >>> check if the current user running the script belongs to a pre-defined group.
>> 
>> >>> Under *nix, I get the list of users belonging to the group and see if
>> >>> the current user is in this list.
>> 
>> >>How exactly you are doing this? (I hope you're not reading it from
>> >>/etc/group, because that file may not exist at all, or contain exactly
>> >>zero relevant
>> >>information.)
>> 
>> > I'm using standard perl commands (getgrnam, getlogin, etc... :
>> > http://perldoc.perl.org/5.14.2/functions/getgrnam.html) which are probably
>> > using standard C libraries in the background (I hope). The doc explicitly
>> > says "The $members value returned by getgr*() is a space-separated list of
>> > the login names of the members of the group" but it's always empty under
>> > Cygwin. 
>> 
>> The functionality you're looking for may(or may not) be available soon(tm).
>> Corinna doing some rework of the core user/group handling as we speak.

> No, sorry.  You don't know it yet, but you really don't want that.  The
> cost to generate full gr_mem info from the Windows user DBs in terms of
> performance is prohibitive.

I've had an itch about it, but I have no tools to check this functionality
myself. Thanks for confirmation.

> And it's really not required information
> because there are other ways to fetch this info only if it's really
> required:

> - For the current user, use getgroups(2):

>     http://linux.die.net/man/2/getgroups

> - For another account use getgrouplist(3):

>     http://linux.die.net/man/3/getgrouplist

>> Check the "Testers needed: New passwd/group handling in Cygwin" thread(s).
>> Do note that in the light of upcoming 1.29 release, snapshots do not contain
>> the code in question. You'd need to rebuild DLL from CVS to get them.

> Or just use the older 2014-03-05 snapshot for the time being.

Indeed, I did mean "current snapshots". Sorry.


--
WBR,
Andrey Repin (anrdaemon AT yandex DOT ru) 14.03.2014, <20:37>

Sorry for my terrible english...


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