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refactor(watch): detect filesystem changes with fsbroker - #3064
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Watching relied on raw fsnotify events plus a hand-rolled deduplicator, so the meaning of a change had to be guessed from event flags. That left real gaps: renaming or deleting a source file did not rerun the task, files created in a directory that appeared after watching started were invisible until the next periodic rescan, and a burst of edits could rerun a task once per event. Task now receives interpreted actions (create, write, rename, remove) and registers watches for new directories as soon as they appear, so those cases rerun the task right away. A burst of changes is coalesced into a single rerun, and changes that are not part of a task's sources no longer interrupt a run already in progress. The deduplicator is no longer needed and was removed. Assisted-by: Crush:prism
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This patch migrates our watched from
fsnotifytofsbroker.fsbrokenis a wrapper aroundfsnotifythat deduplicate events and do some extra work to normalize behavior between different operating systems, etc.We had a deduplicator before, but it wasn't as good as
fsbroker's one.Follow-up PRs:
AddWatchregistering entries with the directory's stat helshabini/fsbroker#9Watching relied on raw fsnotify events plus a hand-rolled deduplicator, so the meaning of a change had to be guessed from event flags. That left real gaps: renaming or deleting a source file did not rerun the task, files created in a directory that appeared after watching started were invisible until the next periodic rescan, and a burst of edits could rerun a task once per event.
Task now receives interpreted actions (create, write, rename, remove) and registers watches for new directories as soon as they appear, so those cases rerun the task right away. A burst of changes is coalesced into a single rerun, and changes that are not part of a task's sources no longer interrupt a run already in progress. The deduplicator is no longer needed and was removed.
Assisted-by: Crush:prism