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[Launchpad Bug Tracker <1926150@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package apt - 2.2.4ubuntu0.1

---------------
apt (2.2.4ubuntu0.1) hirsute; urgency=medium

  * Merge 2.2.4 from Debian unstable
  * Extend the JSON hook fixes with support for version 0.2 (LP: #1926150)
    - json: Add origins fields to version
    - upgrade: Add JSON hook support (AptCli::Hooks::Upgrade)
    - json: Add `package-list` and `statistics` install hooks
    - json: Hook protocol 0.2 (added upgrade,downgrade,reinstall modes)

apt (2.2.4) unstable; urgency=medium

  [ Julian Andres Klode ]
  * Various bugfixes to the JSON hooks:
    - encoder fixes:
      + json: Escape strings using \u escape sequences, add test
      + json: Actually pop states
      + json: Encode NULL strings as null
    - json: Flush standard file descriptors before calling hooks
      (this avoids output from hooks in middle of apt output)
    - Non-installed JSON changes:
      + test/json: Make the test hook more reliable
      + Fix a typo in json-hooks-protocol.md (thanks to Brian Murray)
  * Avoid infinite loop on EOF on media change prompt (LP: #1928687)
  * Turn TLS handshake issues into transient errors (LP: #1928100),
    this makes behavior consistent with TCP and enables Acquire::Retries
  * policy: Apply phasing to uninstalled packages too (LP: #1925745),
    this prevents inconsistencies when installing new binaries that depend
    on the same version of an already installed binary.

  [ David Kalnischkies ]
  * URI encode Filename field of Packages files (again). This fixes a
    regression introduced in 2.1.15 that causes download failures of
    packages with an epoch included in their filename (LP: #1931874).

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Mon, 14 Jun 2021 16:27:40
+0200

** Changed in: apt (Ubuntu Hirsute)
       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 Released
Status in apt source package in Xenial:
  Fix Released
Status in apt source package in Bionic:
  Fix Released
Status in apt source package in Focal:
  Fix Released
Status in apt source package in Hirsute:
  Fix Released
Status in apt source package in Impish:
  Fix Released

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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