[Bug 1923845] [NEW] Please compress packages with zstd by default

[Balint Reczey]

Public bug reported:

[dpkg]
Decompression support in dpkg landed first in Bionic and is being SRUd to Xenial in LP: #1764220 enable Launchpad's Xenial systems to process the zstd-compressed binary packages.
>From dpkg's perspective the upgrade path is cleared.

The original plan was compressing only the internal data.tar .deb
member, but dpkg uses uniform compression by default since dpkg 1.19.0
thus I'm collecting all the changes to support control.tar.zst, too, in
this bug.


TODO:
Process:
https://codesearch.debian.net/search?q=data.tar.xz&literal=1&perpkg=1
https://codesearch.debian.net/search?q=control.tar.xz&literal=1&perpkg=1

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  [dpkg]
  Decompression support in dpkg landed first in Bionic and is being SRUd to Xenial in LP: #1764220 enable Launchpad's Xenial systems to process the zstd-compressed binary packages.
+ From dpkg's perspective the upgrade path is cleared.
  
- From dpkg's perspective the upgrade path is cleared.
+ The original plan was compressing only the internal data.tar .deb
+ member, but dpkg uses uniform compression by default since dpkg 1.19.0
+ thus I'm collecting all the changes to support control.tar.zst, too, in
+ this bug.
+ 
+ 
+ TODO:
+ Process:
+ https://codesearch.debian.net/search?q=data.tar.xz&literal=1&perpkg=1
+ https://codesearch.debian.net/search?q=control.tar.xz&literal=1&perpkg=1

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https://bugs.launchpad.net/bugs/1923845

Title:
  Please compress packages with zstd by default

Status in dpkg package in Ubuntu:
  New

Bug description:
  [dpkg]
  Decompression support in dpkg landed first in Bionic and is being SRUd to Xenial in LP: #1764220 enable Launchpad's Xenial systems to process the zstd-compressed binary packages.
  From dpkg's perspective the upgrade path is cleared.

  The original plan was compressing only the internal data.tar .deb
  member, but dpkg uses uniform compression by default since dpkg 1.19.0
  thus I'm collecting all the changes to support control.tar.zst, too,
  in this bug.

  
  TODO:
  Process:
  https://codesearch.debian.net/search?q=data.tar.xz&literal=1&perpkg=1
  https://codesearch.debian.net/search?q=control.tar.xz&literal=1&perpkg=1

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