[Bug 2127766] Re: snap run --strace doesn't work with sudo-rs [sudo -E not supported]

[Ernest Lotter]

** Description changed:

  [SRU] 2.73: https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/2132084
  
  [ Impact ]
  
  Only impacts Ubuntu 25.10+
  With sudo-rs, -E` is ignored, which breaks snapd run --strace.
  
  [ Test Plan ]
  
- 1. Reproduce with snapd snap < 2.73
+ 1. Reproduce with snapd deb < 2.73
  
  - Ensure sudo-rs installed
  - Run: snap run --strace <snap>.<app>
  - Expect: warning: preserving the entire environment is not supported, `-E` is ignored
  
- 2. Prove fixed with snapd snap 2.73
+ 2. Prove fixed with snapd deb 2.73
  
  - Ensure sudo-rs installed
  - Run: snap run --strace <snap>.<app>
  - Expect: No warning
  
  ---original---
  
  sudo-rs became the default sudo in 25.10, which broke this snap run
  --strace,
  
  $ snap run --strace <snap>.<app>
  warning: preserving the entire environment is not supported, `-E` is ignored
  [sudo: authenticate] Password:
  error: exit status 1
  
  It does work if I switch back to GNU Coreutils' sudo. The reason being
  many required environment variables are no longer passed through, and
  the strace fails due to SNAP_INSTANCE_NAME not being set, before we get
  to execve'ing the snap application itself.
  
  I commented on this use case in the sudo-rs issue tracker:
  https://github.com/trifectatechfoundation/sudo-rs/issues/1299
  
  Maybe snapd needs to have a whitelist of environment variables?

** Tags added: verification-done-resolute

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https://bugs.launchpad.net/bugs/2127766

Title:
  snap run --strace doesn't work with sudo-rs [sudo -E not supported]

Status in snapd:
  Fix Committed
Status in rust-sudo-rs package in Ubuntu:
  Won't Fix
Status in snapd package in Ubuntu:
  New
Status in snapd source package in Jammy:
  Fix Committed
Status in snapd source package in Noble:
  Fix Committed
Status in snapd source package in Plucky:
  Fix Committed
Status in snapd source package in Questing:
  Fix Committed

Bug description:
  [SRU] 2.73:
  https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/2132084

  [ Impact ]

  Only impacts Ubuntu 25.10+
  With sudo-rs, -E` is ignored, which breaks snapd run --strace.

  [ Test Plan ]

  1. Reproduce with snapd deb < 2.73

  - Ensure sudo-rs installed
  - Run: snap run --strace <snap>.<app>
  - Expect: warning: preserving the entire environment is not supported, `-E` is ignored

  2. Prove fixed with snapd deb 2.73

  - Ensure sudo-rs installed
  - Run: snap run --strace <snap>.<app>
  - Expect: No warning

  ---original---

  sudo-rs became the default sudo in 25.10, which broke this snap run
  --strace,

  $ snap run --strace <snap>.<app>
  warning: preserving the entire environment is not supported, `-E` is ignored
  [sudo: authenticate] Password:
  error: exit status 1

  It does work if I switch back to GNU Coreutils' sudo. The reason being
  many required environment variables are no longer passed through, and
  the strace fails due to SNAP_INSTANCE_NAME not being set, before we
  get to execve'ing the snap application itself.

  I commented on this use case in the sudo-rs issue tracker:
  https://github.com/trifectatechfoundation/sudo-rs/issues/1299

  Maybe snapd needs to have a whitelist of environment variables?

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