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On 11/20/06, b.n. <brullonulla@×××××.com> wrote: |
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> Boris Fersing ha scritto: |
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> > let's say you want to install a package "A" which depends on "B" and |
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> > "C", if you emerge these 3 packages with emerge -av A B C, the package |
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> > B and C won't be removed when you'll uninstall A and you'll have |
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> > unneeded dependencies installed on your system ! |
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> > |
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> > If you install only A with emerge -av A and let portage manage the |
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> > dependencies for you, your system will still "clean" ! |
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> |
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> I always understood that "emerge -C" NEVER deleted dependencies (and i |
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> fact, I've never seen it happening). |
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> Isn't it why the dreaded "emerge depclean" exists? |
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|
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Boris has the right answer, but skipped a step or two in his |
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explanation. You are correct that "emerge -C" will not remove |
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dependant packages. But emerge --depclean never removes anything that |
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is in your world file. |
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|
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So let's say you decide to play around with xfce4, so you do "emerge |
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xfce4". This merges all packages that xfce4 depends on, but adds |
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*only* xfce4 to the world file. |
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|
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And then you forget about it, a few months elapse, and a new version |
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comes out. You decide to update using the script (or some other |
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command) that ends up merging each single package without the |
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--oneshot option. Now all of those xfce4 packages are in your world |
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file, not just xfce4. |
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|
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Some more time passes, you realize you have a lot of crap you are not |
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using installed, and decide to cleanup a bit, starting with "emerge -C |
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xfce4". xfce4 is a metabuild that has no files, so that goes really |
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quick, and doesn't really get rid of anything. Now you do "emerge |
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--depclean world", figuring that will clean out dependancies. But |
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because you have all of those xfce4 |
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packages in your world file, depclean doesn't want to remove any of them. |
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|
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> By the way, I've never used --oneshot too... |
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|
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It is almost always a good idea when doing |
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"some_command_to_create_pkg_list | xargs emerge". |
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|
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-Richard |
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-- |
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