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On 28/07/14 07:21 AM, Micha³ Górny wrote: |
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> Dnia 2014-07-25, o godz. 14:49:44 Ian Stakenvicius <axs@g.o> |
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> napisa³(a): |
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> |
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>> Hey all.. So, putting aside for now how much of a mess this |
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>> would be to implement in the virtuals' ebuilds themselves, what |
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>> do people think of changing the virtuals so that they contain an |
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>> entry in IUSE for each provider that can satisfy it? |
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>> |
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>> The idea here is that the package satisfying a virtual could be |
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>> optionally explicitly-chosen through package.use (or USE= in |
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>> make.conf, perhaps) instead of having an entry in @world, that |
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>> way if nothing depends on the virtual then it and the provider |
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>> can be - --depclean'ed from the system. The idea is specifically |
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>> NOT to have rdeps depend on these flags, that would undermine the |
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>> whole purpose of the virtual; it would just be for end-users to |
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>> set if they so chose. |
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> |
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> I think I don't get this argument. |
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> |
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> If you really want to have a particular provider for the virtual |
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> for external purposes, it's fully purposeful to put it in @world |
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> or otherwise in a custom set. In this case, USE flags aren't |
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> helpful. |
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The argument I was trying to make is that USE flags would allow |
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end-users to accomplish the same thing, while not having an entry in |
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@world and therefore allowing the package to be --depclean'ed if the |
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virtual is --depcleaned. |
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I personally don't use sets so i've no idea if the exact same thing |
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could be accomplished in sets; for some reason i don't think so. |
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> |
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> If you only prefer a particular provider, you can tip portage |
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> easily to use it without resorting to USE flags. This also allows |
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> portage to semi-transparently switch to other provider if |
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> dependencies need it. In this case, USE flags only make this |
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> auto-switching harder. |
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That is the other part of this idea, to make auto-switching harder, |
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because right now portage likes to auto-switch even when it seems like |
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it shouldn't. |
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I figure this idea would also help with Ciaran's wishlist item of ||() |
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deps becoming more strictly-controlled and readily deterministic. |
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