Re: [gentoo-portage-dev] /etc/make.profile/use.defaults

[Andrew Gaffney <agaffney@skylineaero.com>]

Pieter Van den Abeele wrote:
> 
> On 12 May 2004, at 17:19, Andrew Gaffney wrote:
> 
>>> I've come across another issue. 'emerge -epvt xfree' shows that 
>>> python wants to install tcl and tk because of the 'tcltk' USE flag 
>>> where my program doesn't. That USE flag is not defined in my 
>>> /etc/make.profile/make.defaults or /etc/make.conf. 'ufed' shows that 
>>> it is defined in /etc/make.profile/use.defaults. I've never come 
>>> across this file before. What does it do?
>>
>>
>> Nevermind. From 'man portage':
>>
>> use.defaults
>>     Here  we  DO  NOT  define  the  default  USE flags, but the so-called
>>     auto-USE flags.  This rather unknown portage feature activates a USE
>>     flag if a specific package is installed and the flag  was  not  
>> explicitly
>>     deactivated.  This file contains the associations between USE 
>> flags and
>>     packages that trigger the auto-USE feature.
>>
>>     In other words, if we never put "sdl" or "-sdl" into our USE, but 
>> we have
>>     media-libs/libsdl emerged, then portage automagically sticks "sdl" 
>> into our
>>     USE for us.
>>
>>     Format:
>>     - comments begin with #
>>     - one USE flag per line with a list of DEPEND atom bases
>>
>>     Example:
>>     # media-libs/libsdl will activate "sdl"
>>     sdl        media-libs/libsdl
>>     # activate tcltk only if we have both
>>     # dev-lang/tcl and dev-lang/tk
>>     tcltk      dev-lang/tcl   dev-lang/tk
>>
>> That makes sense, but shouldn't Portage not use these when operating 
>> with the '--emptytree' flag since it pretends that nothing is installed?
> 
> I think that with 'installed' in this case they also include 'scheduled 
> for installation' (although I'm not 100% sure). For instance If portage 
> schedules tcl and tk in an emptytree, then the tcltk useflag will be 
> enabled for packages having IUSE="tcltk" that are added to the schedule 
> afterwards.

But they are only 'scheduled for installation' if the USE flag is activated. The 
'--emptytree' flag gets emerge in some weird 'chicken and egg' situation. With 
'--emptytree' set, emerge should assume nothing is installed. If nothing is 
installed, then tcl and tk aren't installed and the 'tcltk' USE flag shouldn't 
be auto-activated.

-- 
Andrew Gaffney
Network Administrator
Skyline Aeronautics, LLC.
636-357-1548


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