Cherry pick of #6893 upstream release 1.12 #6902
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* Add a mutex around /etc/hosts updates (for a little extra safety) * Don't write unchanged files * Recover from out-of-sequence guard lines * Add tests Thanks to granular-ryanbonham for the suggestions & finding the issue!
When we have multiple writers racing to write /etc/hosts, we could have file corruption where we see a mix of both files. We can't use a traditional atomic file write, because we are bind-mounting /etc/hosts. Instead we write to /etc/hosts, pause, then re-read the contents. If the contents don't match, we repeat. This will not result in fair queuing, but will avoid corruption.
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: granular-ryanbonham, mikesplain The full list of commands accepted by this bot can be found here. The pull request process is described here
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Cherry pick of #6893 without the glog/klog changes.