[Bug 1693900] Re: apt-get update should return exit code != 0 on error

[Julian Andres Klode]

I can only tell you that either python or C++ should give you what you
need at the moment. You could potentially just parse Err lines, but
that's a bit hacky. As you mentioned, the output changed a bit.

Our functions return booleans every in the stack, it's unclear how and
if we can change that to something else in the near future. I was
thinking more about specifying the goal you want (update something,
update all, etc.) and then failing if the goal is not reached.

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Title:
  apt-get update should return exit code != 0 on error

Status in apt package in Ubuntu:
  Triaged

Bug description:
  When running 'apt-get update' (e.g. on a container install post-
  install script), apt-get return with exit code 0, even so it wasn't
  able to "update" properly. E.g.:

  + apt-get update
  Err:1 http://de.archive.ubuntu.com/ubuntu xenial InRelease
    Temporary failure resolving 'de.archive.ubuntu.com'
  Err:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
    Temporary failure resolving 'security.ubuntu.com'
  Err:3 http://de.archive.ubuntu.com/ubuntu xenial-updates InRelease
    Temporary failure resolving 'de.archive.ubuntu.com'
  Reading package lists... Done
  W: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/xenial/InRelease  Temporary failure resolving 'de.archive.ubuntu.com'
  W: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease  Temporary failure resolving 'de.archive.ubuntu.com'
  W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease  Temporary failure resolving 'security.ubuntu.com'
  W: Some index files failed to download. They have been ignored, or old ones used instead.

  It should be corrected to return useful exit code, so that scripts can
  take the appropriate actions ...

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