[Bug 2048129] [NEW] noble: deb822 format support of /etc/apt/sources.list.d/ubuntu.sources instead of /etc/apt/sources.list

[Chad Smith]

Public bug reported:

In ubuntu noble and later, cloud-init 24.1 based releases will
automatically remove /etc/apt/sources.list and emit a warning log in
cloud-init.log (and cloud-init status exit 2) if it finds in in images
during first boot in favor of writing deb822 formatted
/etc/apt/sources.list.d/ubuntu.sources files.


If livecd-rootfs is manipulating /etc/apt/sources.list in images which have cloud-init enabled, expect that this file will be removed by cloud-init on first boot and any tooling checking for cloud-init status will see a warning exit code.

The non-zero exit code (2) indicating a warning condition when removing /etc/apt/sources.list in cloud-init 
is enough to break CI/CD tooling for scripts which rely on cloud-init status --wait exit codes.


Note: the behavior of cloud-init on mantic and earlier is to overwrite /etc/apt/sources.list on first boot which does This behavior of preferring unifed apt sources in /etc/apt/source.list will be retained on by cloud-init on earlier ubuntu releases even when 24.1 SRUs to stable releases


Also there is preinstalled image support in livecd-rootfs where cloud-init may not be enabled. It would be good to understand the implications if preinstall images migrate to /etc/apt/sources.list.d/ubuntu.sources instead of /etc/apt/sources.list. Be aware that images which contain duplicated sources defined /etc/apt/sources.list and /etc/apt/sources.list.d/ubuntu.sources would also generate warnings from apt like  
LP: #2045086

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: foundations-todo

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https://bugs.launchpad.net/bugs/2048129

Title:
  noble: deb822 format support of /etc/apt/sources.list.d/ubuntu.sources
  instead  of /etc/apt/sources.list

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  In ubuntu noble and later, cloud-init 24.1 based releases will
  automatically remove /etc/apt/sources.list and emit a warning log in
  cloud-init.log (and cloud-init status exit 2) if it finds in in images
  during first boot in favor of writing deb822 formatted
  /etc/apt/sources.list.d/ubuntu.sources files.

  
  If livecd-rootfs is manipulating /etc/apt/sources.list in images which have cloud-init enabled, expect that this file will be removed by cloud-init on first boot and any tooling checking for cloud-init status will see a warning exit code.

  The non-zero exit code (2) indicating a warning condition when removing /etc/apt/sources.list in cloud-init 
  is enough to break CI/CD tooling for scripts which rely on cloud-init status --wait exit codes.

  
  Note: the behavior of cloud-init on mantic and earlier is to overwrite /etc/apt/sources.list on first boot which does This behavior of preferring unifed apt sources in /etc/apt/source.list will be retained on by cloud-init on earlier ubuntu releases even when 24.1 SRUs to stable releases

  
  Also there is preinstalled image support in livecd-rootfs where cloud-init may not be enabled. It would be good to understand the implications if preinstall images migrate to /etc/apt/sources.list.d/ubuntu.sources instead of /etc/apt/sources.list. Be aware that images which contain duplicated sources defined /etc/apt/sources.list and /etc/apt/sources.list.d/ubuntu.sources would also generate warnings from apt like  
  LP: #2045086

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