** Description changed: [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:~# * Build the hello package, it should work * Build the hello package overriding the compression to zstd, this should fail: $ cat debian/rules ... override_dh_builddeb: - dh_builddeb -- -Zzstd + dh_builddeb -- -Zzstd ... make[1]: Entering directory '/root/hello-2.10' dh_builddeb -- -Zzstd - dpkg-deb: building package 'hello' in '../hello_2.10-1ubuntu1_amd64.deb'. - dh_builddeb: dpkg-deb -Zzstd --build debian/hello .. died with signal 13 + dpkg-deb: error: only decompression is supported for 'zstd'! + + Type dpkg-deb --help for help about manipulating *.deb files; + Type dpkg --help for help about installing and deinstalling packages. + dh_builddeb: dpkg-deb -Zzstd --build debian/hello .. returned exit code 2 debian/rules:12: recipe for target 'override_dh_builddeb' failed - make[1]: *** [override_dh_builddeb] Error 1 - [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 should they exist. Only decompression should be supported and this is verified in the test plan. [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
