Preserve metadata when staging a new version of an annexed file.
Performance impact: When adding a large tree of new files, this needs to do some git cat-file queries to check if any of the files already existed and might need a metadata copy. I tried a benchmark in a copy of my sound repository (so there was already a significant git tree to check against. Adding 10000 small files, with a cold cache: before: 1m48.539s after: 1m52.791s So, impact is 0.0004 seconds per file added. Which seems acceptable, so did not add some kind of configuration to enable/disable this. This commit was sponsored by Lisa Feilen.
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@ -87,8 +87,7 @@ catKey' modeguaranteed ref mode
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| modeguaranteed = catObject ref
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| otherwise = L.take 8192 <$> catObject ref
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{- Looks up the file mode corresponding to the Ref using the running
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- cat-file.
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{- Looks up the key corresponding to the Ref using the running cat-file.
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-
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- Currently this always has to look in HEAD, because cat-file --batch
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- does not offer a way to specify that we want to look up a tree object
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