[Bug 1740300] Re: openstack-dashboard depends "apache2 | httpd" but uses a script on postinst not provided by all providers of httpd

[Corey Bryant]

I've pushed a fix for this and it will be included in the next Queens
upload.

** Changed in: horizon (Ubuntu)
       Status: Triaged => Fix Committed

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https://bugs.launchpad.net/bugs/1740300

Title:
  openstack-dashboard depends "apache2 | httpd" but uses a script on
  postinst not provided by all providers of httpd

Status in horizon package in Ubuntu:
  Fix Committed

Bug description:
  In the postinst script for openstack-dashboard, the script
  "/usr/share/apache2/apache2-maintscript-helper" is sourced with no
  checks to confirm it is there, resulting in an installation failure.
  I am using nginx as my web server, which the current requirements of
  "apache2 | httpd" for openstack-dashboard satisfies.

  I don't know for sure whether updating the depends to remove httpd or
  having the postinst script test for the existence of
  /usr/share/apache2/apache2-maintscript-helper is the correct course of
  action.  I'd prefer a test and printed warning if unable to enable a
  config for apache2.

  The error:
    /var/lib/dpkg/info/openstack-dashboard.postinst: 42: .: Can't open /usr/share/apache2/apache2-maintscript-helper

  The relevant code:
    # apache 2.4
    . /usr/share/apache2/apache2-maintscript-helper
    apache2_invoke enconf $CONF || exit $?

  
  Description:    Ubuntu 16.04.3 LTS
  Release:        16.04
  $ apt-cache policy openstack-dashboard
  openstack-dashboard:
    Installed: 3:12.0.1-0ubuntu1~cloud0
    Candidate: 3:12.0.1-0ubuntu1~cloud0
    Version table:
   *** 3:12.0.1-0ubuntu1~cloud0 500
          500 http://ppa.launchpad.net/ubuntu-cloud-archive/pike-staging/ubuntu xenial/main amd64 Packages
          500 http://ppa.launchpad.net/ubuntu-cloud-archive/pike-staging/ubuntu xenial/main i386 Packages
          100 /var/lib/dpkg/status

  Expected - openstack-dashboard installs with its stated dependencies satisfied
  Instead - openstack-dashboard's post-install script failed due to an unmet dependency on apache2

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