[Bug 1999566] Re: [lunar] Hundreds of calls to lsb_release from apt-check

[Renan Rodrigo]

If the team wants to accept the change, we will need a SRU for
https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/2002168
anyway - and this patch can be included, as it affects all the other
releases as well.

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https://bugs.launchpad.net/bugs/1999566

Title:
  [lunar] Hundreds of calls to lsb_release from apt-check

Status in update-notifier package in Ubuntu:
  Confirmed

Bug description:
  I'm not entirely sure the bug is in update-notifier, but let's start
  here.

  In lunar, this script is triggering hundreds of calls to "lsb_release
  -c -s":

  # time /usr/lib/update-notifier/apt-check  --human-readable
  221 updates can be applied immediately.
  To see these additional updates run: apt list --upgradable

  real	0m7.628s
  user	0m5.955s
  sys	0m1.115s

  Running execsnoop on the host, and apt-check in a lunar lxd container,
  execsnoop records 222 lsb_release calls.

  The exact lsb_release call comes from get_dist() from
  https://git.launchpad.net/ubuntu/+source/update-
  manager/tree/UpdateManager/Core/utils.py#n210

  
  Here is a pastebin: https://paste.ubuntu.com/p/FKzBZ3k4nZ/

  apt-check's pid is 352917 (line 39 of paste), and that's the PPID of
  every lsb_release call following that

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