[Bug 1796100] Re: crashes while trying to open auxfiles as .deb

[Launchpad Bug Tracker]

This bug was fixed in the package unattended-upgrades - 1.5ubuntu3

---------------
unattended-upgrades (1.5ubuntu3) cosmic; urgency=medium

  * Skip already adjusted packages from being checked for readjusting.
    This makes it clearer that the recursion ends and can also be a bit quicker.
    (LP: #1790687)
  * Fix PEP 8 warnings.
    Also ignore "W503 line break before binary operator" because it will
    become the best practice.
  * Don't crash on missing dpkg log file (LP: #1795692)
  * do_auto_remove() is successful unless a commit() operation fails
    (LP: #1795696)
  * Check only dowloaded .deb files for conffile prompts (LP: #1796100)

 -- Balint Reczey <rbalint at ubuntu.com>  Sun, 07 Oct 2018 23:16:17 +0200

** Changed in: unattended-upgrades (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1796100

Title:
  crashes while trying to open auxfiles as .deb

Status in unattended-upgrades package in Ubuntu:
  Fix Released

Bug description:
  [Impact]

  unattended-upgrades does not work (reliably) in (bionic and) cosmic
  with the mirror:// method, as it tries to open the mirror file - which
  recent apt versions store in auxfiles - as a .deb:

  2018-10-04 08:58:46,801 ERROR failed to read deb file /var/lib/apt/lists/auxfiles/_etc_apt_mirrors.list (E:Invalid archive signature)
  2018-10-04 08:58:46,801 ERROR failed to read deb file /var/lib/apt/lists/auxfiles/_etc_apt_mirrors.list (E:Invalid archive signature)
  2018-10-04 08:58:46,807 ERROR Apt returned an error, exiting
  2018-10-04 08:58:46,807 ERROR error message: E:Invalid archive signature
  2018-10-04 08:58:46,808 ERROR An error occurred: E:Invalid archive signature
  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 1595, in main
      install_start_time)
    File "/usr/bin/unattended-upgrade", line 1800, in run
      if conffile_prompt(item.destfile):
    File "/usr/bin/unattended-upgrade", line 860, in conffile_prompt
      deb = apt_inst.DebFile(destFile)
  apt_pkg.Error: E:Invalid archive signature

  [Test case]

  1. Start with a not fully upgrades system, then configure it to use
  mirror:// :

  root at cc-apt:~# echo 'deb mirror+file:/etc/apt/mirrors.list cosmic main
  restricted' > /etc/apt/sources.list.d/mirrors-cosmic.list

  root at cc-apt:~# echo 'http://ftp.kfki.hu/linux/ubuntu/' > /etc/apt/mirrors.list
  root at cc-apt:~# echo 'Unattended-Upgrade::DevRelease "true";' > /etc/apt/apt.conf.d/51unattended-upgrades-on-deb
  root at cc-apt:~# apt update
  Get:1 file:/etc/apt/mirrors.list Mirrorlist [33 B]
  Get:2 http://ftp.kfki.hu/linux/ubuntu cosmic InRelease [242 kB]
  ...
  Translation-en [73.7 kB]                          
  Fetched 27.1 MB in 10s (2812 kB/s)                                                                                 
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  280 packages can be upgraded. Run 'apt list --upgradable' to see them.

  2. Clean downloaded files to make u-u redownload them:
  root at cc-apt:~# apt-get clean 
  root at cc-apt:~# rm -f /var/lib/apt/lists/auxfiles/*

  3. Run u-u and observe it crashing with the not fixed version and
  proceeding properly after the fix is applied.

  root at cc-apt:~# unattended-upgrade --dry-run
  Apt returned an error, exiting
  error message: E:Invalid archive signature
  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 2064, in <module>
      sys.exit(main(options))
    File "/usr/bin/unattended-upgrade", line 1595, in main
      install_start_time)
    File "/usr/bin/unattended-upgrade", line 1800, in run
      if conffile_prompt(item.destfile):
    File "/usr/bin/unattended-upgrade", line 860, in conffile_prompt
      deb = apt_inst.DebFile(destFile)
  apt_pkg.Error: E:Invalid archive signature


  [Regression potential]

  The fix makes u-u check only files with .deb extension if they may
  raise configuration prompt. For supporting other file extensions the
  file name pattern will need to be updated.

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