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Backport(v1.19): in_tail: fix typo of @follow_inodes in detach_watcher (#5514) - #5533
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**Which issue(s) this PR fixes**: Fixes # **What this PR does / why we need it**: TailInput#detach_watcher checked `@follow_inode`, which is not defined anywhere, instead of `@follow_inodes`. The typo was introduced in 52e46f0 ("in_tail: Fix a stall bug on !follow_inode case", #4327). With `follow_inodes true`, position entries are keyed by inode, and the inode of a rotated file is dropped from `@tails` when its TailWatcher is detached by `update_watcher`. So `detach_watcher` must unwatch the position entry of that inode even if the same path is still followed by a new watcher. With the typo, the condition was always `nil || !@Tails[tw.path]`, so the entry was left in the position file. Note that `tw.unwatched` is currently set to true only when `follow_inodes` is false (since 51848da), so this doesn't change the behavior of the existing code paths. It makes the condition work as intended so that the position entry handling stays correct when the `unwatched` flag is used with `follow_inodes` too. Add tests for `detach_watcher`: - with `follow_inodes true`, the position entry of the rotated inode is unwatched even while the path is still followed by another watcher. - with `follow_inodes false`, the position entry of the path is kept while the path is still followed by a watcher. **Docs Changes**: None **Release Note**: None Assisted-by: LLM Qwen3.8-Flash-Next Signed-off-by: Takuro Ashie <ashie@clear-code.com> Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Watson1978
approved these changes
Oct 11, 2026
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Which issue(s) this PR fixes:
Backport #5514
Fixes #
What this PR does / why we need it:
TailInput#detach_watcher checked
@follow_inode, which is not defined anywhere, instead of@follow_inodes. The typo was introduced in 52e46f0 ("in_tail: Fix a stall bug on !follow_inode case", #4327).With
follow_inodes true, position entries are keyed by inode, and the inode of a rotated file is dropped from@tailswhen its TailWatcher is detached byupdate_watcher. Sodetach_watchermust unwatch the position entry of that inode even if the same path is still followed by a new watcher. With the typo, the condition was alwaysnil || !@tails[tw.path], so the entry was left in the position file.Note that
tw.unwatchedis currently set to true only whenfollow_inodesis false (since 51848da), so this doesn't change the behavior of the existing code paths. It makes the condition work as intended so that the position entry handling stays correct when theunwatchedflag is used withfollow_inodestoo.Add tests for
detach_watcher:follow_inodes true, the position entry of the rotated inode is unwatched even while the path is still followed by another watcher.follow_inodes false, the position entry of the path is kept while the path is still followed by a watcher.Docs Changes:
None
Release Note:
None
Assisted-by: LLM Qwen3.8-Flash-Next