[Bug 871083] Re: gzip -9n sometimes generates a different output file on different architectures

[Steve Langasek]

Because reproducing this bug is dependent on filesystem order across
multiple buildds, testing the fix in SRU is non-trivial.  However, the
same patch applied to precise has now resulted in all mismatched gzip-
compressed docs being fixed after a rebuild (about 5 other packages were
affected).

I think that, plus the fact that every subsequent SRU to oneiric has
been using this version and there have been no complaints, is sufficient
validation and the SRU should be promoted.  Marking 'verification-done'.

When publishing to -updates, please note that this should also be
published to -security in coordination with the security team, so that
subsequent security updates don't risk regressing multiarch support.

** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/871083

Title:
  gzip -9n sometimes generates a different output file on different
  architectures

Status in “clutter-1.0” package in Ubuntu:
  Triaged
Status in “gtk+2.0” package in Ubuntu:
  Fix Released
Status in “gzip” package in Ubuntu:
  Fix Released
Status in “libtasn1-3” package in Ubuntu:
  Triaged
Status in “pam” package in Ubuntu:
  Fix Released
Status in “gzip” source package in Oneiric:
  Fix Committed
Status in “pam” source package in Oneiric:
  Fix Released
Status in “clutter-1.0” source package in Precise:
  Triaged
Status in “gtk+2.0” source package in Precise:
  Fix Released
Status in “gzip” source package in Precise:
  Fix Released
Status in “libtasn1-3” source package in Precise:
  Triaged
Status in “pam” source package in Precise:
  Fix Released
Status in “gzip” package in Debian:
  New

Bug description:
  SRU justification:
  libpam-modules is not multiarch-coinstallable because of unexplained misgeneration of compressed manpages on the buildds in a previous run.  This makes it impossible to use pam authentication for foreign-arch software due to the uninstallable modules, and also causes unpleasant upgrade issues.

  Test case:
  1) on amd64, enable armel in addition to i386 as a foreign architecture by running:
    echo 'foreign-architecture armel' >> /etc/dpkg/dpkg.cfg.d/multiarch-armel
    echo 'deb [arch=armel] http://ports.ubuntu.com/ubuntu-ports/ oneiric main' >> /etc/apt/sources.list
    apt-get update
  2) try to install libpam-modules for the other two architectures by running 'apt-get install libpam-modules:i386 libpam-modules:armel'
  3) confirm that both packages fail to install.
  4) enable oneiric-proposed (including for armel above).
  5) try to install libpam-modules for all three architectures by running 'apt-get install libpam-modules libpam-modules:i386 libpam-modules:armel'
  6) confirm that the packages install successfully.

  error while updating

  ProblemType: Package
  DistroRelease: Ubuntu 11.10
  Package: libpam-modules 1.1.3-2ubuntu1
  ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 1.23-0ubuntu2
  Architecture: amd64
  Date: Sat Oct  8 18:57:52 2011
  ErrorMessage: ErrorMessage: './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  SourcePackage: pam
  Title: package libpam-modules 1.1.3-2ubuntu1 failed to install/upgrade: ErrorMessage: './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system
  UpgradeStatus: Upgraded to oneiric on 2011-10-09 (0 days ago)

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