86 lines
3.6 KiB
Markdown
86 lines
3.6 KiB
Markdown
Finish "git annex watch" command, which runs, in the background, watching via
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inotify for changes, and automatically annexing new files, etc.
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There is a `watch` branch in git that adds such a command. To make this
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really useful, it needs to:
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- on startup, add any files that have appeared since last run **done**
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- on startup, fix the symlinks for any renamed links **done**
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- on startup, stage any files that have been deleted since last run
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(seems to require a `git commit -a` on startup, or at least a
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`git add --update`, which will notice deleted files) **done**
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- notice new files, and git annex add **done**
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- notice renamed files, auto-fix the symlink, and stage the new file location
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**done**
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- handle cases where directories are moved outside the repo, and stop
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watching them **done**
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- when a whole directory is deleted or moved, stage removal of its
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contents from the index **done**
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- notice deleted files and stage the deletion
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(tricky; there's a race with add since it replaces the file with a symlink..)
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**done**
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- periodically auto-commit staged changes (avoid autocommitting when
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lots of changes are coming in)
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- tunable delays before adding new files, etc
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- Coleasce related add/rm events. See commit
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cbdaccd44aa8f0ca30afba23fc06dd244c242075 for some details of the problems
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with doing this.
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- don't annex `.gitignore` and `.gitattributes` files, but do auto-stage
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changes to them
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- configurable option to only annex files meeting certian size or
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filename criteria
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- honor .gitignore, not adding files it excludes (difficult, probably
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needs my own .gitignore parser to avoid excessive running of git commands
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to check for ignored files)
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- Possibly, when a directory is moved out of the annex location,
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unannex its contents.
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- Gracefully handle when the default limit of 8192 inotified directories
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is exceeded. This can be tuned by root, so help the user fix it.
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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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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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Possible fix: Move content someplace before doing checksumming.
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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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* 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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