[Merge] lp:~clint-fewbar/ubuntu/natty/upstart/restore-re-exec-code into lp:ubuntu/upstart

[Clint Byrum]

So, the simpler solution to the race between umountroot exitting and the re-exec completing, brought up by James Hunt, is to watch for changes in /proc/1 .. I think /proc/1/maps is the right place to look.

We are working on a patch to sysvinit's umountroot script to take care of that. In the mean time, this patch should probably be uploaded without it, as this patch will at least give us *some* way of telling upstart to re-exec itself, so the sooner people are booting with this version of upstart, the less corrupted /'s there will be.
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https://code.launchpad.net/~clint-fewbar/ubuntu/natty/upstart/restore-re-exec-code/+merge/45295
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