[Bug 1815761] Re: Alternative to Dpkg::Post-Invoke that runs even if dpkg did not have to be invoked

[Julian Andres Klode]

Verified by running echo TEST1815761 as the hook, across all releases
with their SRU versions (as shown in the log below).


$ lxc exec apt-cosmic --  apt upgrade apt -tnow -o APT::Install::Post-Invoke-Success::="/bin/echo TEST1815761"
Reading package lists... Done
Building dependency tree       
Reading state information... Done
apt is already the newest version (1.7.3).
apt set to manually installed.
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
TEST1815761


$ lxc exec apt-bionic --  apt upgrade apt -tnow -o APT::Install::Post-Invoke-Success::="/bin/echo TEST1815761"
Reading package lists... Done
Building dependency tree       
Reading state information... Done
apt is already the newest version (1.6.9).
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
TEST1815761

$ lxc exec apt-xenial --  apt upgrade apt -tnow -o APT::Install::Post-Invoke-Success::="/bin/echo TEST1815761"
Reading package lists... Done
Building dependency tree       
Reading state information... Done
apt is already the newest version (1.2.30).
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
TEST1815761


$ lxc exec apt-trusty --  apt upgrade apt -tnow -o APT::Install::Post-Invoke-Success::="/bin/echo TEST1815761"
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
apt is already the newest version.
The following packages were automatically installed and are no longer required:
  libfreetype6 os-prober
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
TEST1815761

$ lxc exec apt-trusty --  apt-cache policy apt #apt upgrade apt -tnow -o APT::Install::Post-Invoke-Success::="/bin/echo TEST1815761"
apt:
  Installed: 1.0.1ubuntu2.21
  Candidate: 1.0.1ubuntu2.21
  Version table:
 *** 1.0.1ubuntu2.21 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 Packages
        100 /var/lib/dpkg/status

** Tags removed: verification-needed verification-needed-bionic verification-needed-cosmic verification-needed-trusty verification-needed-xenial
** Tags added: verification-done verification-done-bionic verification-done-cosmic verification-done-trusty verification-done-xenial

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https://bugs.launchpad.net/bugs/1815761

Title:
  Alternative to Dpkg::Post-Invoke that runs even if dpkg did not have
  to be invoked

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Trusty:
  Fix Committed
Status in apt source package in Xenial:
  Fix Committed
Status in apt source package in Bionic:
  Fix Committed
Status in apt source package in Cosmic:
  Fix Committed
Status in apt source package in Disco:
  Fix Released

Bug description:
  [Impact]
  Dpkg::Post-Invoke is run only when dpkg had to be run. We'd like to be able to show some extra output even if no changes had been made. Imagine "the user disabled the security repo, and does not get any updates shown scenario" - we'd like to be able to tell them that there are security updates available after all.

  [Test case]
  1. Specify an APT::Install::Post-Invoke-Success hook

  2. Make sure it runs even if there are no changes, using apt upgrade
  -tnow

  [Regression potential]
  No-change upgrades/install can now fail if this new hooks fail.

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