[Bug 1848357] [NEW] Adjusting transitive dependencies of packages slows down unattended-upgrades a lot

[Balint Reczey]

Public bug reported:

[Impact]

 * Unattended-upgrades tries to mark packages for upgrade and when it
fails to do so and falls back to mark adjusting packages to use
candidates from allowed origins it can spend a lot of CPU time on
packages which are not installable in the end.

[Test Case]

 * Mark an upgradable package from the security pocket as held.
 * Observe u-u adjusting only direct dependencies, instead of doing it recursively.

[Regression Potential]

 * U-u may fail to install updates due to APT not finding a solution
without having transitive dependences adjusted. In those cases the
update should mark the transitive dependencies which enable the update
as direct dependencies.

** Affects: unattended-upgrades (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1848357

Title:
  Adjusting transitive dependencies of packages slows down unattended-
  upgrades a lot

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  [Impact]

   * Unattended-upgrades tries to mark packages for upgrade and when it
  fails to do so and falls back to mark adjusting packages to use
  candidates from allowed origins it can spend a lot of CPU time on
  packages which are not installable in the end.

  [Test Case]

   * Mark an upgradable package from the security pocket as held.
   * Observe u-u adjusting only direct dependencies, instead of doing it recursively.

  [Regression Potential]

   * U-u may fail to install updates due to APT not finding a solution
  without having transitive dependences adjusted. In those cases the
  update should mark the transitive dependencies which enable the update
  as direct dependencies.

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