[Bug 2067585] Re: Upgrades to noble chmod /dev/null 644

[Nick Rosbrook]

Thanks for reviewing. I have populated this section now.

** Description changed:

  [Impact]
  Upgrades to noble chmod /dev/null 644, breaking use of the device on multi-user systems for non-root.
  
  [Test plan]
  1. do-release-upgrade mantic -> noble
  2. check that /dev/null remains 666
  
  [Where problems could occur]
  
+ This patch makes apt use a tempfile for extended_states during the dist-
+ upgrade simulation. The change is confined to the simulation, so that is
+ where we would see problems, potentially about the permissions/existence
+ of the tempfile we use.
+ 
  [Details]
  This is a regression of the fix for bug 2064090, where we pointed apt_pkg.config["Dir::State::extended_states"] = "/dev/null" in the simulation to not lose the automatically installed bit, as we need that later, apt chmod's it extended_states.
  
  The fix for this is to create a temporary file for extended_states, and
  then remove the temporary file at the end of the simulation.

** Changed in: ubuntu-release-upgrader (Ubuntu Noble)
       Status: Incomplete => In Progress

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https://bugs.launchpad.net/bugs/2067585

Title:
  Upgrades to noble chmod /dev/null 644

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Noble:
  Fix Committed

Bug description:
  [Impact]
  Upgrades to noble chmod /dev/null 644, breaking use of the device on multi-user systems for non-root.

  [Test plan]
  1. do-release-upgrade mantic -> noble
  2. check that /dev/null remains 666

  [Where problems could occur]

  This patch makes apt use a tempfile for extended_states during the
  dist-upgrade simulation. The change is confined to the simulation, so
  that is where we would see problems, potentially about the
  permissions/existence of the tempfile we use.

  [Details]
  This is a regression of the fix for bug 2064090, where we pointed apt_pkg.config["Dir::State::extended_states"] = "/dev/null" in the simulation to not lose the automatically installed bit, as we need that later, apt chmod's it extended_states.

  The fix for this is to create a temporary file for extended_states,
  and then remove the temporary file at the end of the simulation.

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