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>>>>> On Sat, 23 Apr 2011, Ciaran McCreesh wrote: |
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> On Sat, 23 Apr 2011 16:47:37 +0200 |
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> Chí-Thanh Christopher Nguyễn <chithanh@g.o> wrote: |
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>> What I propose solves the problems that old-style virtuals |
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>> introduce in dependency resolution. What other problems do they |
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>> cause? |
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> DEPEND=">=virtual/blah-2" |
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> DEPEND="virtual/blah[foo]" |
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> DEPEND="!virtual/that-i-provide" |
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> PROVIDE="not-a/virtual" |
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> best_version virtual/blah |
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> The full VDB load required to figure out whether or not a virtual is |
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> installed. |
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Apart from these, information for old-style virtuals is decentralised: |
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It's scattered over all packages providing the virtual, plus several |
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virtuals files in profiles (in January, we had about 60 such files). |
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Obviously it's difficult to keep track of this. When going through the |
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remaining old-style virtuals, I've found examples for all of the |
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following: |
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- virtual provided by packages but not listed in profiles |
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- virtual listed in profiles but not provided by any package |
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- virtuals file in profiles listing a preferred package that doesn't |
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provide the virtual |
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- versioned package atoms for virtuals in profiles |
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- virtual removed long time ago, but some packages still containing |
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forgotten PROVIDE lines and blockers |
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- virtual listed in profiles, but was converted to new-style long ago |
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Besides, if you look at the history of profiles/base/virtuals, you'll |
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see that the last old-style virtuals were added in 2006. I take this |
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as an indication that there's no real need for them. |
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Ulrich |
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