Upgrades to noble chmod /dev/null 644

[Julian Andres Klode]

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

[Test plan]

Upgrade from mantic to noble:

1. do-release-upgrade --proposed
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.

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-release-upgrader - 1:24.10.4

---------------
ubuntu-release-upgrader (1:24.10.4) oracular; urgency=medium

  * DistUpgrade: drop quirk for systems with BIOS and XFS /boot (LP: #2067886)
  * DistUpgrade: use tempfile for apt extended_states during simulation
    (LP: #2067585)
  * DistUpgradeQuirks: drop t64 replacement quirk
  * Run pre-build.sh: updating mirrors, demotions, and translations.

 -- Nick Rosbrook <email address hidden> Wed, 05 Jun 2024 16:58:21 -0400

[Andreas Hasenack (ahasenack)]

This SRU is missing the [Where problems could occur] section.

[Nick Rosbrook (enr0n)]

Thanks for reviewing. I have populated this section now.

[Andreas Hasenack (ahasenack)]

Hello Julian, or anyone else affected,

Accepted ubuntu-release-upgrader into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/ubuntu-release-upgrader/1:24.04.19 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-noble. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Nick Rosbrook (enr0n)]

I have verified the fix using ubuntu-release-upgrader from noble-proposed:

test@m:~$ do-release-upgrade --proposed
Checking for a new Ubuntu release

= Welcome to Ubuntu 24.04 LTS 'Noble Numbat' =

The Ubuntu team is proud to announce Ubuntu 24.04 LTS 'Noble Numbat'.

To see what's new in this release, visit:
  https://wiki.ubuntu.com/NobleNumbat/ReleaseNotes

Ubuntu is a Linux distribution for your desktop or server, with a fast
and easy install, regular releases, a tight selection of excellent
applications installed by default, and almost any other software you
can imagine available through the network.

We hope you enjoy Ubuntu.

== Feedback and Helping ==

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Continue [yN] y
Get:1 Upgrade tool signature [833 B]
Get:2 Upgrade tool [1282 kB]
Fetched 1283 kB in 0s (0 B/s)
authenticate 'noble.tar.gz' against 'noble.tar.gz.gpg'
extracting 'noble.tar.gz'
[sudo] password for test:
[screen is terminating]

test@m:~$ stat -c %a /dev/null
666

test@m:~$ cat /etc/os-release
PRETTY_NAME="Ubuntu 24.04 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LO...

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-release-upgrader - 1:24.04.19

---------------
ubuntu-release-upgrader (1:24.04.19) noble; urgency=medium

  * DistUpgrade: drop quirk for systems with BIOS and XFS /boot (LP: #2067886)
  * DistUpgradeQuirks: make sure replacement.candidate is not None
    (LP: #2067071)
  * DistUpgrade: use tempfile for apt extended_states during simulation
    (LP: #2067585)
  * Run pre-build.sh: updating mirrors, demotions, and translations.

 -- Nick Rosbrook <email address hidden> Tue, 04 Jun 2024 11:55:51 -0400

[Andreas Hasenack (ahasenack)]

The verification of the Stable Release Update for ubuntu-release-upgrader has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.