[Bug 2106617] Re: apt-add-repository -L/--list shows only repositories defined in deb822 .sources files, not in the old-stype sources.list file format

[Julian Andres Klode]

The signed-by  field in sources.list files is not (and never has been)
supported by python-apt and hence software-properties, hence I believe
it's not shown, as --list likely only shows valid sources.

Rest assured that valid sources are being shown,, for example on my
system I see:

  deb [arch=amd64] https://dl.google.com/linux/chrome/deb/ stable main

There is a separate feature request for adding more fields to the legacy
format parser, but I have not yet acted on it, there is a certain
regression potential there in that sources are now considered valid that
were not before and some code might not handle it correctly (for
example, it may copy the source by copying individual fields and then
omit the signed-by option).

** Description changed:

  As per the summary, on Ubuntu 24.04 LTS, `add-apt-repository -L` now
  only lists repositories defined in the new, deb822 .sources files,
  ignoring the old-style `sources.list(5)` files:
  
  ```
  $ ls /etc/apt/sources.list.d
  foo.list  ubuntu.sources
  $ cat /etc/apt/sources.list.d/foo.list
  deb [signed-by=/etc/apt/keyrings/foo.gpg arch=amd64] https://repo.example.com/ stable main
  $ cat /etc/apt/sources.list.d/ubuntu.sources
  Types: deb
  URIs: http://ubuntu.example.org/ubuntu
  Suites: noble noble-updates noble-backports
  Components: main restricted universe multiverse
  Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
  
  Types: deb
  URIs: http://security.ubuntu.com/ubuntu/
  Suites: noble-security
  Components: main restricted universe multiverse
  Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
  $ add-apt-repository -L
  Types: deb
  URIs: http://ubuntu.example.org/ubuntu
  Suites: noble noble-updates noble-backports
  Components: main restricted universe multiverse
  Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
  
  Types: deb
  URIs: http://security.ubuntu.com/ubuntu/
  Suites: noble-security
  Components: main restricted universe multiverse
  Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
  ```
  
- This looks like a fallout from #2060331
+ This looks like a fallout from bug 2060331

** Changed in: software-properties (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2106617

Title:
  apt-add-repository -L/--list shows only repositories defined in deb822
  .sources files, not in the old-stype sources.list file format

Status in software-properties package in Ubuntu:
  Invalid

Bug description:
  As per the summary, on Ubuntu 24.04 LTS, `add-apt-repository -L` now
  only lists repositories defined in the new, deb822 .sources files,
  ignoring the old-style `sources.list(5)` files:

  ```
  $ ls /etc/apt/sources.list.d
  foo.list  ubuntu.sources
  $ cat /etc/apt/sources.list.d/foo.list
  deb [signed-by=/etc/apt/keyrings/foo.gpg arch=amd64] https://repo.example.com/ stable main
  $ cat /etc/apt/sources.list.d/ubuntu.sources
  Types: deb
  URIs: http://ubuntu.example.org/ubuntu
  Suites: noble noble-updates noble-backports
  Components: main restricted universe multiverse
  Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

  Types: deb
  URIs: http://security.ubuntu.com/ubuntu/
  Suites: noble-security
  Components: main restricted universe multiverse
  Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
  $ add-apt-repository -L
  Types: deb
  URIs: http://ubuntu.example.org/ubuntu
  Suites: noble noble-updates noble-backports
  Components: main restricted universe multiverse
  Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

  Types: deb
  URIs: http://security.ubuntu.com/ubuntu/
  Suites: noble-security
  Components: main restricted universe multiverse
  Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
  ```

  This looks like a fallout from bug 2060331

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