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List: ubuntu-devel
Subject: Upgrading libzstd in Ubuntu Xenial
From: Yann Collet <cyan () fb ! com>
Date: 2017-11-23 19:46:24
Message-ID: 6BA73DCB-08EA-46D7-AFDD-F5C6387D8432 () fb ! com
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Hello
I'm trying to raise awareness on issue 1717040:
https://bugs.launchpad.net/xenial-backports/+bug/1717040
zstd is a compression algorithm developed at Facebook.
It's available on most linux/bsd distributions, as referenced here:
https://repology.org/metapackage/zstd/versions
Unfortunately, Ubuntu LTS 16.04 Xenial shipped with an experimental version, labelled \
v0.5.1. This version uses an early experimental format, incompatible with the \
"stable" format, officially supported since all versions starting >= v1.0 \
(unofficially supported starting >= v0.8.x).
This makes Ubuntu Xenial incompatible with all other distributions, including later \
Ubuntu releases, because it reads and generate a different format.
This has ripple effects on a growing number of applications depending on zstd, as \
they cannot rely on system's libzstd, since an especially important Linux \
distribution ships an incompatible version. Ubuntu Xenial is latest Ubuntu LTS \
version, and it's expected to stay around and be supported up to 2021.
To solve this problem, it's enough to backport a new version of libzstd, from a newer \
Ubuntu release. To this end, a backport request has been issued:
https://bugs.launchpad.net/xenial-backports/+bug/1717040
the package proposed here has been tested, and works successfully.
Unfortunately, the process seems to be stuck in the "after test" stage, with no \
progress since September.
Is there any way to get this action completed, so that applications depending on zstd \
can safely expect it to work on Ubuntu LTS too?
Regards
Yann Collet
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<p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt">Hello<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt">I'm trying to raise awareness on issue \
1717040:<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt"><a \
href="https://bugs.launchpad.net/xenial-backports/+bug/1717040">https://bugs.launchpad.net/xenial-backports/+bug/1717040</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><br>
zstd is a compression algorithm developed at Facebook.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">It's available on \
most linux/bsd distributions, as referenced here:<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><a \
href="https://repology.org/metapackage/zstd/versions">https://repology.org/metapackage/zstd/versions</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt">Unfortunately, Ubuntu LTS 16.04 Xenial shipped \
with an experimental version, labelled v0.5.1.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">This version uses an \
early experimental format, incompatible with the "stable" format, \
<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt">officially supported since all versions starting >= v1.0 \
(unofficially supported starting >= v0.8.x).<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt">This makes Ubuntu Xenial incompatible with all \
other distributions, including later Ubuntu releases,<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">because it reads and \
generate a different format.<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt">This has ripple effects on a growing number of \
applications depending on zstd, as they cannot rely on system's libzstd, \
<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt">since an especially important Linux distribution ships an \
incompatible version.<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt">Ubuntu Xenial is latest Ubuntu LTS version, and it's \
expected to stay around and be supported up to 2021.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt">To solve this problem, it's enough to backport \
a new version of libzstd, from a newer Ubuntu release.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">To this end, a backport \
request has been issued:<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt"><a \
href="https://bugs.launchpad.net/xenial-backports/+bug/1717040">https://bugs.launchpad.net/xenial-backports/+bug/1717040</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">the package \
proposed here has been tested, and works successfully.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><br> Unfortunately, the \
process seems to be stuck in the "after test" stage, with no progress since \
September.<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt">Is there any way to get this action completed, \
so that applications depending on zstd can safely expect it to work on Ubuntu LTS \
too?<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt">Regards<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Yann \
Collet<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:11.0pt"><o:p> </o:p></span></p> </div>
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