[Bug 1669649] Re: update-apt-xapian-index crashes with IndexError: list index out of range

[Nick B.]

It is still an issue on 17.10 but I discovered it seemed to have been
triggered by a specific package in a local LAN repo I am using. Once I
removed the package from the repo it stopped crashing. However, I have
been unable to determine what exactly about the package was causing it
to crash which I would still think is a bug as apt-xapian-index should
probably handle bad packages more gracefully.

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https://bugs.launchpad.net/bugs/1669649

Title:
  update-apt-xapian-index crashes with IndexError: list index out of
  range

Status in apt-xapian-index package in Ubuntu:
  Incomplete

Bug description:
  Running sudo update-apt-xapian-index --force --update ends up crashing

  sudo update-apt-xapian-index --force --update
  Reading en translations from /var/lib/apt/lists/ppa.launchpad.net_byobu_ppa_ubuntu_dists_yakkety_main_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-security_multiverse_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety_universe_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/archive.canonical.com_ubuntu_dists_yakkety_partner_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/ppa.launchpad.net_rvm_smplayer_ubuntu_dists_yakkety_main_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-updates_multiverse_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-updates_universe_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-updates_restricted_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-security_main_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-security_restricted_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety_multiverse_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-security_universe_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/ppa.launchpad.net_mkusb_ppa_ubuntu_dists_yakkety_main_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-backports_main_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-backports_universe_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/ppa.launchpad.net_psi-plus_ppa_ubuntu_dists_yakkety_main_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety_restricted_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety_main_i18n_Translation-en: done.  
  Reading en translations from /var/lib/apt/lists/mirror.us.leaseweb.net_ubuntu_dists_yakkety-updates_main_i18n_Translation-en: done.  
  Reading Xapian index: done.  
  Updating Xapian index... 70%Traceback (most recent call last):
    File "/usr/sbin/update-apt-xapian-index", line 109, in <module>
      indexer.incrementalUpdate()
    File "/usr/lib/python3/dist-packages/axi/indexer.py", line 706, in incrementalUpdate
      self.updateIndex(dbpath)
    File "/usr/lib/python3/dist-packages/axi/indexer.py", line 685, in updateIndex
      db.replace_document(outdated[pkg.name], self.get_document_from_apt(pkg))
    File "/usr/lib/python3/dist-packages/axi/indexer.py", line 543, in get_document_from_apt
      addon.obj.index(document, pkg)
    File "/usr/share/apt-xapian-index/plugins/relations.py", line 130, in index
      self._index_rel(pfx, val, document)
    File "/usr/share/apt-xapian-index/plugins/relations.py", line 114, in _index_rel
      doc.add_term(pfx + name.split(None, 1)[0])
  IndexError: list index out of range

  Description:    Ubuntu 16.10
  Release:        16.10

  Expected result: update-apt-xapian-index should not crash
  Actual result: update-apt-xxapian-index crashes every time.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: apt-xapian-index 0.47ubuntu11
  ProcVersionSignature: Ubuntu 4.8.0-39.42-generic 4.8.17
  Uname: Linux 4.8.0-39-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Thu Mar  2 21:52:29 2017
  InstallationDate: Installed on 2011-10-22 (1958 days ago)
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  SourcePackage: apt-xapian-index
  UpgradeStatus: Upgraded to yakkety on 2016-10-14 (140 days ago)

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