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JeroenV
Guru
Joined: 16 Jul 2002
Posts: 447
Location: Amsterdam / Hamburg
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 Posted: Thu Nov 21, 2002 5:27 pm Post subject: Portage improve suggestion for reverse dependencies |
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Hi,
Wouldn't it be neat to hace a feature in Portage that removes all unused libs?
A possible way to implement this would be to use something like a "usage hierarchy" with a "level"property for each "node". Something like this:
| Code: |
sylpheed (E) mozilla (E) sylpheed (E) pan (E)
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-------------------- ------------------
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libssl (L) libxface (L)
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---------------------------------------------
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libip4 (L)
with:
(E) end user app
(L) lib
(names are fictional)
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Now if sylpheed AND mozilla would be removed, libssl could also be removed, because it meets 2 conditions:
1) it is not needed by "higher" progs
2) it has no (E) status, which means it is also not needed by the user
What do you think?
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Jeroen
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choward
Tux's lil' helper
Joined: 08 Nov 2002
Posts: 92
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| Posted: Thu Nov 21, 2002 5:41 pm Post subject: |
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Seems reasonable, but wouldn't reference counting be easier? When a package is installed that depends on another package, the base package has its use count increased. When a package is removed, all dependencies have their use count decreased. All packages that are dependencies of the removed package that now have a use count of 0 can be removed too.
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Craig Howard
4B Computer Science -- University of Waterloo |
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AlterEgo
Veteran
Joined: 25 Apr 2002
Posts: 1619
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| Posted: Thu Nov 21, 2002 6:58 pm Post subject: |
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Have you seen this thread ?
It deals with the exact same subject, and offers some approaches that are quite similar, with working (but maybe dangerous) scripts to do the trick. |
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rac
Bodhisattva
Joined: 30 May 2002
Posts: 6553
Location: Japanifornia
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JeroenV
Guru
Joined: 16 Jul 2002
Posts: 447
Location: Amsterdam / Hamburg
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| Posted: Thu Nov 21, 2002 8:23 pm Post subject: |
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I agree with choward, I didn't think it over carefully enough 
I posted a reference-count reverse dependency tracking feature request to bug 2938: | Quote: | Suggestion: implement reverse dependency tracking using reference counts:
every package has a reference counter indicating how many packages that depend
on it are installed. Whenever reference count for a package is 0, it will be
automatically removed.
Maybe extra feature: at the end of the "dependency chain" the reference count is
inherently always 0, which means that end-user applications will always be
automatically removed. To avoid this, we could have a flag indicating that it is
an end user app. |
I know there are some scripts, but I really think this stuff belongs in Portage
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Cheers
Jeroen
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May The Source be with you! |
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