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Investigated using the OSX fsevents API to detect when files are modified,
so they can be committed when using direct mode. There's a
[haskell library](http://hackage.haskell.org/package/hfsevents-0.1.3)
and even a [sample directory watching program](http://hackage.haskell.org/package/hobbes).
Initial tests look good...
Using fsevents will avoid kqueue's problems with needing enough file
descriptors to open every subdirectory. kqueue is a rather poor match for
git-annex's needs, really. It does not seem to provide events for file
modifications at all, unless every *file* is individually opened. While I
dislike leaving the BSD's out, they need a better interface to be perfectly
supported by git-annex, and kqueue will still work for indirect mode
repositories.
----
Got the assistant to use fsevents. It seems to work well!
The only problem I know of is that it doesn't yet handle whole directory
renames. That should be easy to fix later.
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