But is this really what one should expect from an update? Shouldn't emerge just _not_ modify the world file when one gives the -u flag?
Well, i'm really not a gentoo expert (4 weeks ago i didn't know anything about it), but at the moment i fired that command, i saw emerge printing 'adding to world favorites file'....
Did you examine your world file after firing the mentioned command ? How many entries does your world file contain, and can you remember that you've explicitly emerged all of them ?
I just made a test: i've not installed lynx on one of my boxes yet, but since it is always a good idea to have lynx on all linux boxes, i entered the following command:
emerge -up lynx
then, emerge told me that lynx would be installed as new package [N], then i entered
emerge -u lynx
After installing the package, it has been added to my world favorites file.
You're right, one should expect that an upgrade option shouldn't install new packages from scratch, and i think it also shouldn't add the package to the world favorites file. Maybe someone might fire up a feature request to the portage-ng developers ?
After all, it is not a serious desaster if one has got all the stuff added to the world file, but i wanted to have a clean system with no software installed that i don't need, so i edited my world file by hand, but had some trouble remembering all and every package.
Eventually, 'emerge depclean' told me about 25 packages that it would uninstall. Fortunately, i frequently used 'emerge depclean', so i knew that these 25 packages would all still be required. So i started researching, but as i got tired at night (after many hours of research), i said to myself 'dammit', and entered 'emerge depclean'.
I thought it should be no problem to re-emerge these packages later, but the caveeat is that they're added to the world file then..
Final result: my gnome desktop background picture isn't loaded at gdm startup, my desktop is always empty until i manually specify a new picture, but each time i restart gdm, my desktop is empty again. Everything else works fine, so i can live with it for a while. Somewhen in the future, i'll find out what's going on, but i'll never forget the --oneshot option again.. :)
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