[Bug 1008225] Re: vmbuilder fails using tmpfs due to upstart restarting cron in the tmpfs

[Alex Dehnert]

It looks to me like the issue is that while vmbuilder moves away initctl
to avoid starting any services, upstart (or maybe another init?) gets
reinstalled, replacing the moved initctl. As a result, it leaks a cron
invocation. (I'm not totally sure why the policy-rc.d change that's in
the guest isn't working --- my assumption is that initctl is contacting
Upstart outside the chroot over D-Bus, and that Upstart sees the hosts'
/usr/sbin/policy-rc.d. I guess vmbuilder could stash something in that
policy-rc.d, but that seems slightly messy.)

I've attached a patch that seems to allow me to build VMs running hardy,
lucid, maverick, natty, oneiric, and precise (all amd64; I haven't
tested other architectures). The earlier suites are no longer supported,
so building those bails pretty quickly...

** Patch added: "lucid-vm.patch"
   https://bugs.launchpad.net/ubuntu/+source/vm-builder/+bug/1008225/+attachment/3208174/+files/lucid-vm.patch

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https://bugs.launchpad.net/bugs/1008225

Title:
  vmbuilder fails using tmpfs due to upstart restarting cron in the
  tmpfs

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