races
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@ -39,3 +39,46 @@ really useful, it needs to:
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- Support OSes other than Linux; it only uses inotify currently.
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- Support OSes other than Linux; it only uses inotify currently.
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OSX and FreeBSD use the same mechanism, and there is a Haskell interface
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OSX and FreeBSD use the same mechanism, and there is a Haskell interface
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for it,
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for it,
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## the races
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Many races need to be dealt with by this code. Here are some of them.
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* File is added and then removed before the add event starts.
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Not a problem; The add event does nothing since the file is not present.
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* File is added and then removed before the add event has finished
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processing it.
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Minor problem; When the add's processing of the file (checksum and so
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on) fails due to it going away, there is an ugly error message, but
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things are otherwise ok.
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* File is added and then removed before the add event finishes.
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Currently unfixed; The annex add re-adds the file as a symlink and then
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the remove event does nothing since the symlink exists.
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* File is added and then replaced with another file before the annex add
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makes its symlink.
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Minor problem; The annex add will fail creating its symlink since
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the file exists. There is an ugly error message, but the second add
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event will add the new file.
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* File is added and then replaced with another file before the annex add
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moves its content into the annex.
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Currently unfixed; The new content will be moved to the annex under the
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old checksum, and fsck will later catch this inconsistency.
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* File is removed and then re-added before the removal event finishes.
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Not a problem; The removal event removes the old file from the index, and
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the add event adds the new one.
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* File is removed and then re-added before the removal event starts.
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Not a problem; The removal event does nothing since the file exists,
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and the add event replaces it in git with the new one.
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