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[Mateusz Stachowski <1449959@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1449959

Title:
  Running ./unity --replace ... terminates the session and starts a new
  one on vivid

Status in gnome-session package in Ubuntu:
  In Progress
Status in gnome-session source package in Vivid:
  Fix Committed

Bug description:
  [ Description ]

  Due to an error when merging with Debian, ubuntu's gnome-session file is
  inadvertantly starting compiz when it should instead be managed by
  upstart.  This means that we don't, for example, have unity restarted by
  upstart if it crashes and (as the reporter of this bug notes) unity
  --replace breaks due to gnome-session tearing the session down if one of
  its required components goes away and comes back.

  [ Fix ]

  Remove "compiz;" from ubuntu.session so that the unity7.conf shipped by
  unity is used.

  [ QA ]

  Verify that you see the following before upgrading

  laney@raleigh> status unity7
  unity7 stop/waiting
  laney@raleigh> pstree -s -p $(pidof compiz)
  systemd(1)───lightdm(1625)───lightdm(10651)───upstart(10864)───gnome-session(11094)───compiz(11374)─┬─{dconf worker}(11382)
                                                                                                      ├─{gdbus}(11383)
                                                                                                      └─{gmain}(11376)

  i.e. compiz is a child of gnome-session, and the unity7 job isn't
  running.

  and this after

  laney@raleigh> status unity7
  unity7 start/running, process 8945
  laney@raleigh> pstree -s -p $(pidof compiz)
  systemd(1)───lightdm(1625)───lightdm(8487)───upstart(8715)───compiz(8945)─┬─{dconf worker}(8972)
                                                                            ├─{gdbus}(8976)
                                                                            └─{gmain}(8950)

  compiz is a direct child of upstart and the unity7 job is running.

  Additionally, verify that unity --replace kicks you back to the display
  manager before and unity is replaced in-session after.

  [ Regression potential ]

  unity's job is now used instead of upstart being started by
  gnome-session. This was the case since we started having upstart in the
  session, but make sure that login and logout still work properly.

  [ Original description ]

  Running ./unity --replace <params> on vivid  (systemd) exits the session
  and the login screen of lightdm appears. After log in, a new session
  starts.

  Steps:
  1- build unity
  2- run ./unity --replace with the env. variables and parameters you used
     on utopic
  3- see the lightdm login screen and login

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-session 3.14.0-2ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Apr 29 13:15:16 2015
  InstallationDate: Installed on 2014-07-04 (299 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: gnome-session
  UpgradeStatus: No upgrade log present (probably fresh install)

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