Given a Heroku app.:

If I have a cron job that populates a cache directory in RAILS_ROOT/tmp once a day, and all of my dynos go idle, when they "wake up", will the "tmp" directory be empty or will it still contain what my cron job wrote?

(I think the deeper question here is whether a dyno "wakes up" in some pre-existing state, or whether a dyno. is simply reconstituted from the slug state at deploy-time? I apologize if my phrasing is awkward/imprecise.)

If "tmp" will be empty, do we have any way to hook into the "dyno wake-up process" in order to do some filesystem initialization in /tmp?

Thanks,
Wes

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