[Bug 2078101] Re: No dep8 tests for Ubuntu-specific default sysctl.d changes

[Heitor Alves de Siqueira]

Ok, so this is fairly straightforward to implement using autopkgtests'
isolation-machine restriction. There's an existing sysctl-defaults test
that I've expanded to cover most of the Ubuntu-specific tunables.

There's an additional autopkgtest for procps that's consistently failing
in the LP builders (stack-limit), that I'd like to cover with this as
it's a relatively "minor" fix. I'm going to look into this additional
test and see if we can upload a new version that runs all tests
correctly.

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Title:
  No dep8 tests for Ubuntu-specific default sysctl.d changes

Status in procps package in Ubuntu:
  In Progress

Bug description:
  In bug 2003027, Ubuntu's procps regressed the default qdisc from
  fq_codel to pfifo_fast. Given that this was considered important
  enough to justify changing behaviour in a stable release, we should
  have an autopkgtest that verifies our intended delta against upstream,
  but we do not.

  I appreciate that it's tricky to write a test that might need a VM to
  pick up kernel defaults to fully validate this, but we could at least
  have an autopkgtest that ensures that /etc/sysctl.d/ contains the
  expected net.core.default_qdisc setting and not any duplicate
  settings. You could also include checks for anything else that is
  Ubuntu-specific in there.

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