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[David Britton <david.britton@xxxxxxxxxxxxx>]

** Also affects: libzstd (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: libzstd (Ubuntu Zesty)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1717040

Title:
  Please backport libzstd 1.3.1+dfsg-1 (universe) from artful

Status in libzstd package in Ubuntu:
  Confirmed
Status in libzstd source package in Xenial:
  New
Status in libzstd source package in Zesty:
  New

Bug description:
  [Impact]

   * An explanation of the effects of the bug on users and

   * justification for backporting the fix to the stable release.

   * In addition, it is helpful, but not required, to include an
     explanation of how the upload fixes this bug.

  [Test Case]

   * detailed instructions how to reproduce the bug

   * these should allow someone who is not familiar with the affected
     package to reproduce the bug and verify that the updated package fixes
     the problem.

  [Regression Potential]

   * discussion of how regressions are most likely to manifest as a
  result of this change.

   * It is assumed that any SRU candidate patch is well-tested before
     upload and has a low overall risk of regression, but it's important
     to make the effort to think about what ''could'' happen in the
     event of a regression.

   * This both shows the SRU team that the risks have been considered,
     and provides guidance to testers in regression-testing the SRU.

  [Other Info]
   
   * Anything else you think is useful to include
   * Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
   * and address these questions in advance

  
  --- Original description ---

  Please backport libzstd 1.3.1+dfsg-1 (universe) from artful to xenial.

  Reason for the backport:
  ========================
  Current version in Xenial is v0.5.1,
  it's an experimental version, using its own, incompatible format.
  As a consequence, zstd on Ubuntu Xenial is not compatible with the rest of the world.

  This is of important concern for products using libzstd as a shared library :
  on Ubuntu Xenial, produced data is different, not compatible with v1+.

  This issue has been made more pressing with the integration of zstd in Linux Kernel,
  as userland tools must also be updated to read and generate zstd.

  Note : this request was first improperly filled at :
  https://bugs.launchpad.net/zesty-backports/+bug/1717037

  Testing:
  ========
  Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

  Backport available from PPA:
  https://launchpad.net/~ginggs/+archive/ubuntu/backports

  * xenial:
  [X] Package builds without modification (needs debhelper 10)
  [X] zstd installs cleanly and runs
  [ ] zstd-dbgsym installs cleanly and runs
  [ ] libzstd1-dbgsym installs cleanly and runs
  [X] libzstd-dev installs cleanly and runs
  [X] libzstd1 installs cleanly and runs

  No reverse dependencies

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