Well, inotify is great and all.  However features like this simply won't
always exist or always work properly.  A good case in point is locking
over NFS.

Thus dpkg or the install scripts need a hook for every file that needs
inotify.  This call back should be run after the inotify and it should
first detect either by looking for the results of the inotify(possibly
best) or test inotify on it's own.  If an issue is detected corrective
action needs to be taken, likely via a call back.

Yes, that's right...  "Why bother with inotify."

inotify for updates is a poor choice because updates are not done 100 or
even 1000s of times per day, so the performance loss of sending a
signal(kill -HUP) is preferred over a system that sometimes doesn't
work.

However inotify can be useful in fast-paths, that's what it's good for.
Start using the right tool for the job.

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https://bugs.launchpad.net/bugs/882147

Title:
  overlayfs does not implement inotify interfaces correctly

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