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[Launchpad Bug Tracker <1926150@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package apt - 1.2.35

---------------
apt (1.2.35) xenial; urgency=medium

  * Backport JSON hooks, version 0.2, to xenial (LP: #1926150). The JSON code
    files are identical to that of 2.3.2, only the integration and test cases
    needed minor adjustment to behave correctly, especially:
    - In private-install.cc, exit before showing the list of packages to
      upgrade/install/etc, in case an error is already set. This moves the
      behavior closer to bionic.
  * Backport zstd support for Launchpad zstd enablement (LP: #1926437)
  * Fix indendation of changelog message in 1.2.34 changelog.
  * Bug fixes needed for JSON hooks:
    - private-install: Handle existing errors before showing lists
    - Avoid duplicated error in `apt search`
  * Bug fixes affecting CI / autopkgtest only:
    - prepare-release: Ignore alternative build dependencies
    - tests: Do not expect requested-by if sudo was invoked by root
    - tests: Export TZ=UTC to work around test failures on non-UTC hosts
    - tests: avoid time-dependent rebuild of caches

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Wed, 28 Apr 2021 14:55:54
+0200

** Changed in: apt (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1926150

Title:
  [SRU] Backport JSON hooks 0.2

Status in apt package in Ubuntu:
  Fix Committed
Status in apt source package in Xenial:
  Fix Released
Status in apt source package in Bionic:
  New
Status in apt source package in Focal:
  New
Status in apt source package in Hirsute:
  New
Status in apt source package in Impish:
  Fix Committed

Bug description:
  [Impact]
  We want to be able to use JSON hooks 0.2 in xenial and later releases to display messages to users during dist-upgrade.

  For xenial, we backport the JSON hook support in its entirety, whereas
  for later releases, we only need to cherry-pick bugfixes and the v0.2
  improvements.

  [Test plan]
  We have included unit and integration tests for the new JSON code to test the writer and prevent regressions in future changes. Regressions in other parts of the code should be caught by the test suite.

  
  [Where problems could occur]
  There may be bugs in the JSON code (apt-private/private-json-hooks.*) and in the integration thereof. The JSON hook code is identical to 2.3.2, whereas the integration code needed slight adjustments.

  The integration changes are limited to adding the hooks, and (for
  xenial, already in later releases) collecting all unknown package
  names. We believe the regression potential of these changes to be
  fairly limited.

  However, errors in JSON hooks are fatal, so once JSON hooks are
  running, they can cause apt to fail, which has to be kept in mind.

  Existing JSON hooks might not expect the new notifications, and break,
  but we are only aware of the snapd hook and it ignores any unknown
  notifications, so that should not pose a problem.

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