[Bug 2047453] Re: Error message missing compared to `apt-get update`

[Julian Andres Klode]

You'll have to investigate the individual items to see why it failed.
It's generally not advisable to use the "apt" module as it is badly
abstracted, use "apt_pkg" instead.

** Changed in: python-apt (Ubuntu)
       Status: New => Invalid

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Title:
  Error message missing compared to `apt-get update`

Status in python-apt package in Ubuntu:
  Invalid

Bug description:
  Assuming there is no package server running on `localhost`:

  ```
  $ echo 'deb [trusted=yes] http://localhost:8000/ bogus-test-repo main' | sudo tee /etc/apt/sources.list.d/placeholder-test-repo.list
  ```

  and then

  ```
  $ python -c "import apt; c = apt.Cache(); c.update()"
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 575, in update
      raise FetchFailedException()
  apt.cache.FetchFailedException
  ```

  and compare with

  ```
  $ sudo apt-get update
  Ign:1 http://localhost:8000 bogus-test-repo InRelease
  Hit:2 http://archive.ubuntu.com/ubuntu jammy InRelease                   
  Hit:3 http://security.ubuntu.com/ubuntu jammy-security InRelease         
  Hit:4 http://archive.ubuntu.com/ubuntu jammy-updates InRelease           
  Hit:5 http://archive.ubuntu.com/ubuntu jammy-backports InRelease
  Ign:1 http://localhost:8000 bogus-test-repo InRelease
  Ign:1 http://localhost:8000 bogus-test-repo InRelease
  Err:1 http://localhost:8000 bogus-test-repo InRelease
    Could not connect to localhost:8000 (127.0.0.1). - connect (111: Connection refused)
  Reading package lists... Done
  W: Failed to fetch http://localhost:8000/dists/bogus-test-repo/InRelease  Could not connect to localhost:8000 (127.0.0.1). - connect (111: Connection refused)
  W: Some index files failed to download. They have been ignored, or old ones used instead.
  ```

  I expected the Python `apt` interface to produce a similar or
  identical error message.


  ```
  # lsb_release -rd
  Description:    Ubuntu 22.04.3 LTS
  Release:        22.04

  # apt-cache policy python3-apt
  python3-apt:
    Installed: 2.4.0ubuntu2
    Candidate: 2.4.0ubuntu2
    Version table:
   *** 2.4.0ubuntu2 500
          500 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       2.3.0ubuntu2 500
          500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
  ```

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