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[Impact]

zsync is extremely useful to those of us who need to test .iso images
often. In personal experience, 0.6.3 contains enormous improvements over
0.6.2 in resolute due to a number of new features and performance
improvements. Per its NEWS file:

Changes in 0.6.3
- Performance improvements for large (>250MB) files - on multi-gigabyte files
  this can be a very large improvement.
- Tuning to reduce likelyhood of hitting bad performance due to bad checksum
  distribution.
- Fix case where client would think download succeeded and try verifying it
  when it had really failed.
- Fix a problem where the client could get into a loop retrieving data if the
  remote returned data inconsistent with the .zsync file.
- Improvements to some of the error and progress messages.
- Stop zsync requesting bytes past the end of the target file.
- Fix bug where mtime would be set to something offset from the intended value
  due to timezones.
- Fix a case where auth headers could be send to the wrong server across a
 redirect. Send auth headers unconditionally when username & password are
  provided.
- Fix compilation with gcc-14.
- Other optimisations.

[Scope]

 * Backport zsync 0.6.4-2 from stonking (dev series)
 * Backport to 26.04 (Resolute Raccoon)

[Other Information]

Reverse Depends:

* Not a build dependency.
 - vanilla-gnome-desktop
 - quickemu, which presumably uses zsync as a runtime dependency for 
downloading .iso images. This has been tested and there are no regressions here.

Reverse Recommends:

* Metapackages only:
 - kubuntu-desktop - ACK obtained from rikmills via Matrix
 - ubuntu-budgie-desktop - ACK obtained from fossfreedom
 - lubuntu-desktop - ACK from arraybolt3

Maintenance:

 * Further backports of zsync will be provided by myself to noble with
newer versions in the devel branch as they come. Each one will be
regression-tested against quickemu.

** Affects: zsync (Ubuntu)
     Importance: Medium
     Assignee: Erich Eickmeyer (eeickmeyer)
         Status: In Progress

-- 
[BPO] zsync/0.6.3-2 from stonking to resolute
https://bugs.launchpad.net/bugs/2169424
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