[Bug 1820886] Re: Potential inconsistency due to system halt/reboot being allowed when package installation in progress

[Julian Andres Klode]

Something like that Python script should be enough really to catch most
issues:

import apt_pkg, os

apt_pkg.init()

dir = apt_pkg.config.find_dir("Dir::Cache::Archives")
while True:
  try:
    apt_pkg.get_lock(os.path.join(dir, "lock"))
    break
  except:
    continue

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https://bugs.launchpad.net/bugs/1820886

Title:
  Potential inconsistency due to system halt/reboot being allowed when
  package installation in progress

Status in apt package in Ubuntu:
  Triaged

Bug description:
  [System]
  Any current Ubuntu Desktop/Server supported release (Trusty, Xenial, Bionic, Cosmic).

  [Impact]
  Package installation turns into an inconsistent state if system is rebooted in the middle of an apt install/upgrade.

  [Test Case]
  1. User1 at Ubuntu box issues "sudo apt-get upgrade";
  2. User2 at Ubuntu box issues "shutdown -r" or reboots it using the GUI;
  3. System reboots and potentially turns into an inconsistent state.

  [Remarks]
  APT should automatically inhibit system halts/reboots while packages being installed/removed. A similar behavior to what is shown by unattended-upgrades.

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