** Description changed:

  [Impact]
  
  VMware Horizon is a VDI product that runs atop of VMware's normal
  virtualisation stack, and it supports SSO authentication for login.
  
  In the past, the VMware Horizon agent has been pretty buggy, and
  requires SSO patches to be present to function, otherwise it breaks and
  causes entire outages for anyone trying to use the VDI.
  
  To solve this, VMware had been custom compiling their own libgnome-
  shell.so libraries with their SSO patches, which are based on oVirt's
  SSO implementation. When you install VMware Horizon agent to the
  instance, it overwrites Ubuntu's libgnome-shell.so with their custom
  compiled one.
  
  VMware don't keep their custom compiled libgnome-shell.so library up to
  date, so bugs that have already been fixed still live on in their
  library. Also, when Ubuntu updates our gnome-shell packages, it
  overwrites the custom libgnome-shell.so library, which then causes the
  Horizon agent to break, and causes outages for anyone using the VDI,
  which have to be solved by manually copying the custom library back.
  
  This situation is untenable for VMware Horizon users, so I have asked
  VMware to upstream their SSO patches. After a long painful process, they
  have landed in gnome-shell master.
  
  This SRU will significantly improve the quality of life for VMware
  Horizon users, and will remove the need for VMware to distribute custom
  libraries.
  
  [Testcase]
  
  You need an instance that runs on VMware Horizon, and the Horizon agent
  needs to be installed and running. Ideally, SSO authentication should be
  enabled to test all features, but it is not necessary to partially test.
  
  Test packages are available in this ppa:
  https://launchpad.net/~mruffell/+archive/ubuntu/sf247978-test
  
  If you install the test package in a VMware Horizon VDI, the instance
  should come up cleanly after reboot and function properly, especially
  with SSO login.
  
  The instance should be able to function without custom libgnome-shell.so
  libraries provided by VMware.
  
- 
  [Regression Potential]
  
  The code refactors the oVirt SSO implementation into a more generalised
  interface, which other virtualisation platforms can use. oVirt has been
  transitioned to this interface as part of the refactoring, which means
  that any if the new oVirt SSO implementation is broken, it could break
  users running in oVirt.
  
  VMware's patches also use the new generalised interface, which is much
  simpler than before, and it has been tested internally by VMware. There
  was a very long review process with upstream GNOME, which ironed out all
  of their concerns.
  
  I have been reviewing the code along the way, and I am confident that it
  will not cause any regressions. If a regression did occur, then it would
  break SSO functionality only.
  
  [Other Information]
  
  Upstream Issue: https://gitlab.gnome.org/GNOME/gnome-shell/issues/1983
  Upstream merge-request: 
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/915
  
  Commits:
  
- commit 809f820cd4a4eebb120ab5dde3f1985d35bcb540 
+ commit 809f820cd4a4eebb120ab5dde3f1985d35bcb540
  Author: yun341 <5933...@qq.com>
  Date: Sat, 4 Jan 2020 00:31:15 +0800
  Subject: gdm: Refactor oVirt to a generic CredentialManager interface
  Link: 
https://gitlab.gnome.org/GNOME/gnome-shell/-/commit/809f820cd4a4eebb120ab5dde3f1985d35bcb540
  
  commit 4ea0fca4fc09ffd6e0b6994ee1354f07f7d5d2b5
  Author: yun341 <5933...@qq.com>
  Date: Thu, 2 Jul 2020 06:54:55 +0800
  Subject: gdm: Introduce vmware credential manager for pre-authenticated logins
  Link: 
https://gitlab.gnome.org/GNOME/gnome-shell/-/commit/4ea0fca4fc09ffd6e0b6994ee1354f07f7d5d2b5
+ 
+ commit 00437750ed9c7e0982854e20be8c36c6bda7b254
+ Author: Andre Moreira Magalhaes <an...@endlessm.com>
+ Date:   Mon Aug 17 18:41:04 2020 -0300
+ Subject: authPrompt: Properly get oVirt service name
+ Link: 
https://gitlab.gnome.org/GNOME/gnome-shell/-/commit/00437750ed9c7e0982854e20be8c36c6bda7b254
+ 
+ commit 3fb321fd214469130539e1e31461257a749bff21
+ Author: yun341 <5933...@qq.com>
+ Date:   Mon Sep 21 22:11:41 2020 +0800
+ Subject: authPrompt: set value of beginRequestType to 'DONT_PROVIDE_USERNAME'
+ Link: 
https://gitlab.gnome.org/GNOME/gnome-shell/-/commit/3fb321fd214469130539e1e31461257a749bff21

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https://bugs.launchpad.net/bugs/1886592

Title:
  Add support for VMware Horizon SSO to gnome-shell

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