[Bug 1996177] [NEW] Cleaner environment for dpkg execution

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Julian Andres Klode (juliank):

APT currently launches dpkg in the same environment as it is launched in
leaking all sorts of environment variables to it, only overriding PATH
with a sensible default.

This is suboptimal, apt should clean the environment more thoroughly or
populate a clean environment from scratch.

Questions to answer:

* Perhaps it can reuse systemd or sudo or pam mechanisms?
* If not, what can we copy/pass-through? e.g. TERM needs to be kept the same.
* What to do about hooks
* umask(022) before executing dpkg (anything?), also need correct umask for lists for sure.

** Affects: apt (Ubuntu)
     Importance: Medium
         Status: Triaged

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Cleaner environment for dpkg execution
https://bugs.launchpad.net/bugs/1996177
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