general-concepts/dependencies: mention common pitfalls #376
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| In <c>PDEPEND</c>, weak blockers act effectively like those in | ||
| <c>RDEPEND</c>, while strong blockers behave more like weak ones because | ||
| satisfaction may be delayed post-install. |
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I don't think that's true, is it?
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@mgorny your text states this:
This leaves PDEPEND which is a bit unclear. Again, technically both blocker types are valid. However, weak blockers in PDEPEND would be pretty much equivalent to those in RDEPEND, so there is no reason to use that class. Strong blockers in PDEPEND would logically be equivalent to weak blockers — since the satisfaction of this dependency class can be delayed post install.
Should I just drop this bullet since it is unclear?
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I think we should drop it. I'm not convinced it's guaranteed.
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This commit copies from mgorny's blog posts about common pitfalls in writing dependencies, and adds them to the devmanual. Signed-off-by: Michał Górny <mgorny@gentoo.org> Closes: https://bugs.gentoo.org/587526 Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>
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@ulm please merge it if you are fine with this PR |
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| <codesample lang="ebuild" caption="Example of correct use of := outside any-of"> | ||
| IUSE="a b" | ||
| REQUIRED_USE="^^ (a b)" |
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| REQUIRED_USE="^^ (a b)" | |
| REQUIRED_USE="^^ ( a b )" |
| In <c>PDEPEND</c>, weak blockers act effectively like those in | ||
| <c>RDEPEND</c>, while strong blockers behave more like weak ones because | ||
| satisfaction may be delayed post-install. |
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I think we should drop it. I'm not convinced it's guaranteed.
@thesamesam still had some comments. (@arthurzam: I can apply these two changes when merging if that's o.k.) |
please do, I'm currently resting after returning from military service... |
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Merged, with the whitespace change applied and the |
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This commit copies from @mgorny 's blog posts about common pitfalls in writing dependencies, and adds them to the devmanual.
I've added his sign off (based on https://bugs.gentoo.org/587526#c2) but it might have been wrongly done - but I don't really know the correct way to attribute here (I do want to mention him as the super main source).
Closes: https://bugs.gentoo.org/587526