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It seems like a simple before/after comparison of active useflags and the text |
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of the src_* functions (skipping build and install if they are completely |
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identical) should catch the majority of unnecessary rebuilds. |
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|
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On 25 July 2014 13:36 Ian Stakenvicius wrote: |
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> On 25/07/14 01:15 PM, Andreas K. Huettel wrote: |
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> > |
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> >>> Maybe this could be solved by having two kinds of revisions: - |
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> >>> One would rebuild all as usually (for example, -r1...) - The |
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> >>> other one would only regenerate VDB and wouldn't change the |
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> >>> installed files (for example, -r1.1) |
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> >>> |
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> >>> But I am not sure if it could be viable from a "technical" |
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> >>> point of view :( |
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> >> |
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> >> I'm afraid it couldn't. The major problem is not knowing *when* |
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> >> to migrate metadata, portage usually gets that right. The problem |
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> >> is in getting the correct output which is often near to |
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> >> impossible. |
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> > |
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> > I think we'd appreciate some more information here: |
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> > |
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> > * What exactly is the metadata that we're talking about? * How much |
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> > of it can be generated by sourcing the ebuild, without running |
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> > phases? * When does that exactly break? Example? |
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> > |
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> |
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> It may help this overall discussion to step back even further here: |
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> |
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> * What do we want to accomplish, exactly? |
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> |
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> - allow portage to emerge updated packages without rebuilding them |
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> (ie running src_* and pkg_*inst phases), when it can be determined |
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> from metadata changes (or for -rX.Y method perhaps it is assumed |
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> -just- on filename changes) that this is not necessary. |
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> |
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> * What are all of the cases that would validly trigger this |
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> dont-bother-to-run-phases shortcut? |
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> |
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> - addition of missing dependency [1] |
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> - new useflag not enabled by default |
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> - removed useflag that was not previously enabled |
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> - changing of dependency atom(s) -- ie swapping a specific atom to |
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> virtual one |
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> - EAPI bump (maybe??) |
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> - .... <-- add more please! |
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> |
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> |
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> * For each of the above, in what cases is a full rebuild probably |
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> necessary anyhow?? |
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> |
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> - dependency atom minimum version is increased, and the in-VDB version |
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> of this dep is too old (??) |
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> - new dependency atom is missing from VDB (??) |
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> - EAPI bump adds new entries to VDB that need to be calculated from |
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> say, merge phase |
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> - .... |
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> |
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> |
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> |
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> ..i think from there we can perhaps determine what metadata could be |
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> updated and/or needs to be updated to maintain consistency in the |
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> dont-rebuild cases we want. |
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> |
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