[Merge] ~gunnarhj/ubuntu-release-upgrader:temp-font into ubuntu-release-upgrader:ubuntu/main

[Nick Rosbrook]

> I have struggled a bit more with this. Tried a quick and dirty way to drop
> privileges, but it proved to not be sufficient.
> 
> The trick is to make it both read from and write to the right dconf database
> ($HOME/.config/dconf/user), and when I only changed setresgid and setresuid,
> it still interacted with /root/.cache/dconf/user. Changing HOME made me come
> closer, but it insists to create $HOME/.cache/dconf/user instead of updating
> $HOME/.config/dconf/user.
> 
> So I'm stuck. Again.

There is a function in DistUpgradeController.py that should work. I think you just need to do this in both of your functions:

try:
   self.controller._setNonRootEUID()
   // existing code
finally:
   os.seteuid(os.getuid())
-- 
https://code.launchpad.net/~gunnarhj/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/451815
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~gunnarhj/ubuntu-release-upgrader:temp-font into ubuntu-release-upgrader:ubuntu/main.