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Part of a small yak shave for #3817 The `atomicwrites` lib uses the atomic rename trick and does correct fsyncs for us, so if we lose power while rewriting or reverting `/etc/resolv.conf`, it should always be in a recoverable state. (Unless the hard drive lies about fsync, but then it's beyond our control.) --------- Signed-off-by: Reactor Scram <ReactorScram@users.noreply.github.com>