Re: [gentoo-dev] USE variables in ebuilds and using them for multiple install paths

[Matt Tucker <tuck@whistlingfish.net>]

-- Jeff Stuart <jstuart@computer-city.net> spake thusly:

> What I WANTED to do in the src_install was to check if gtk and/or
> gtk2 was in the USE flag.  IF both, then it would copy both the gtk1
> and gtk2 theme for Geramik.  If only gtk1, then it would copy just
> the gtk1 files and remove the gtk2 files.  If GTK2 only, well... that
> would be an odd case. ;)  Then I'd copy the gtk2 files, then grab the
> .png's from the gtk1 theme, and finally awk the gtkrc for gtk2 theme
> to point to the right pixmap.
> 
> What I TRIED was the following:
<snip>
> And no matter WHAT I did including modifying my make.conf, passing
> env USE="-gtk2", etc.  It STILL thought that both gtk1 AND gtk2 were
> set!!!!  Why? :D  
> 
> Finally, would that be the proper use of the USE flags?  

All of those should work fine:

    $ export USE="gtk gtk2"
    $ use() { local x; for x in ${USE}; do
    >           if [ "${x}" = "${1}" ]; then
    >             echo "${x}";
    >             return 0;
    >           fi;
    >         done;
    >         return 1;
    > }
    $ use gtk
    gtk
    $ [ "`use gtk`" -a "`use gtk2`" ] && echo true
    true
    $ USE="gtk"
    $ use gtk2
    $ [ "`use gtk`" -a "`use gtk2`" ] && echo true
    $ [ "`use gtk`" -a ! "`use gtk2`" ] && echo true
    true

Sure, this doesn't test actually setting your USE flags, but it does
test the [] functionality. You could try doing "echo $USE" before your
tests, just to make sure that you know what you're working with.

For what it's worth, I just tried setting USE="gtk gtk2" in my
make.conf, and then doing 'USE="-gtk2" ebuild ...' on the command line,
and everything worked as you would expect.


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