** Description changed: - As discussed previously, we want to have zstd support in 18.04 to - evaluate and potentially enable it in later releases. + [Impact] + + * Xenial's dpkg can't decompress zstd-compressed binary packages + preventing some systems of Launchpad from processing packages with such + compression. This blocks publishing zstd-compressed binary packages + through Launchpad for later Ubuntu releases as well. + + [Test Plan] + + * https://people.canonical.com/~rbalint/zstd-debs/ contains a .deb built on Hirsute having both data and control members of the .deb being compressed with zstd. + * Download and unpack it. With unfixed dpkg an error should be shown. + + $ wget https://people.canonical.com/~rbalint/zstd-debs/glibc-doc- + reference_2.33-0ubuntu2~zstd1_all.deb + + # unfixed: + $ dpkg-deb -R glibc-doc-reference_2.33-0ubuntu2~zstd1_all.deb glibc-doc-extracted + dpkg-deb: error: archive 'glibc-doc-reference_2.33-0ubuntu2~zstd1_all.deb' uses unknown compression for member 'control.tar.zst', giving up + + # fixed + $ time dpkg-deb -R glibc-doc-reference_2.33-0ubuntu2~zstd1_all.deb glibc-doc-extracted + + real 0m0.148s + user 0m0.041s + sys 0m0.124s + + * Also install the package: + + root@x-zstd:~# dpkg -i glibc-doc-reference_2.33-0ubuntu2~zstd1_all.deb + Selecting previously unselected package glibc-doc-reference. + (Reading database ... 25816 files and directories currently installed.) + Preparing to unpack glibc-doc-reference_2.33-0ubuntu2~zstd1_all.deb ... + Unpacking glibc-doc-reference (2.33-0ubuntu2~zstd1) ... + Setting up glibc-doc-reference (2.33-0ubuntu2~zstd1) ... + Processing triggers for install-info (6.1.0.dfsg.1-5) ... + root@x-zstd:~# + + + [Where problems could occur] + + * The fix is isolated and is a backport from Bionic with the compression + part omitted. Crashes could happen due to coding errors. + + [Original Bug Text] + As discussed previously, we want to have zstd support in 18.04 to evaluate and potentially enable it in later releases. The zstd support adds a dependency on libzstd1 to dpkg. This should not have any effect on live images, since libzstd1 is part of the various live tasks, as btrfs-progs need it. For installed systems, this might be a new dependency (if they do not use btrfs, tor, or some other tools), so an increase of ~520 KB, as that's the size of the library and the library only depends on libc6. The change is isolated, it adds the compressor and decompressor to dpkg, please see the attached patch for the details. The change is being discussed here: https://lists.ubuntu.com/archives/ubuntu-devel/2018-March/040211.html https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892664
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1764220 Title: [SRU] dpkg zstd support To manage notifications about this bug go to: https://bugs.launchpad.net/dpkg/+bug/1764220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
