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[Brian Murray <brian@xxxxxxxxxx>]

** Also affects: unattended-upgrades (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1737637

Title:
  Replacing configuration file directory with file breaks unattended-
  upgrades

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Xenial:
  New

Bug description:
  [Impact]

   * Unattended-upgrades crashes when a package update changes a config dir to a config file.
   * U-u stops installing security updates when it crashes.

  [Test Case] (Xenial)

   * Install an older version of the git package than the one available from xenial-security:
   # apt install git=1:2.7.4-0ubuntu1

   * Change a configuration file to a directory and observe not fixed u-u crashing and fixed u-u installing the update.
  # mv /etc/bash_completion.d/git-prompt /etc/bash_completion.d/git-prompt.bak
  # mkdir /etc/bash_completion.d/git-prompt
  # unattended-upgrade --verbose --dry-run
  Initial blacklisted packages: 
  Initial whitelisted packages: 
  Starting unattended upgrades script
  Allowed origins are: ['o=Ubuntu,a=xenial', 'o=Ubuntu,a=xenial-security', 'o=UbuntuESM,a=xenial']
  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 1485, in <module>
      main(options)
    File "/usr/bin/unattended-upgrade", line 1275, in main
      if conffile_prompt(item.destfile):
    File "/usr/bin/unattended-upgrade", line 671, in conffile_prompt
      with open(prefix + conf_file, 'rb') as fb:
  IsADirectoryError: [Errno 21] Is a directory: '/etc/bash_completion.d/git-prompt'

  # fixed u-u:
  # unattended-upgrade --verbose --dry-run
  ...
  Unpacking git (1:2.17.1-1ubuntu0.4) over (1:2.17.1-1ubuntu0.3) ...
  dpkg: warning: git: conffile '/etc/bash_completion.d/git-prompt' is not a plain file or symlink (= '/etc/bash_completion.d/git-prompt')
  Setting up git (1:2.17.1-1ubuntu0.4) ...
  dpkg: warning: git: conffile '/etc/bash_completion.d/git-prompt' is not a plain file or symlink (= '/etc/bash_completion.d/git-prompt')
  ...

  [Regression Potential]

   * As a known and demonstrated regression configuration files replaced
  with directories by the local administrator are overwritten and this
  is dpkg's default behavior. The same thing would happen when applying
  the security update using apt, and this is still better than skipping
  the security update.

  [Original Bug Text]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades.  This problem was most recently seen with package version 0.98ubuntu1, the problem page at https://errors.ubuntu.com/problem/ed79dbb4e6eba8c7b89fcd7e0cbf60b0db4920ce contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 1556, in <module>
      main(options)
    File "/usr/bin/unattended-upgrade", line 1348, in main
      if conffile_prompt(item.destfile):
    File "/usr/bin/unattended-upgrade", line 725, in conffile_prompt
      with open(prefix + conf_file, 'rb') as fp:
  IsADirectoryError: [Errno 21] Is a directory: '/etc/fonts/conf.avail/65-0-fonts-guru-extra.conf'

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