Need to set up the app environment properly

[Michał Sawicz]

Today, UAL just passes the session environment to launched apps. This doesn't work well in all use cases (see bug #1670727).

UAL should have a mechanism for modifying the different environments in which it launches apps (at least XMir vs. native, maybe also local vs. libertine vs. snap).

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: libubuntu-app-launch4 0.10+17.04.20170215.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-9.11-generic 4.10.0
Uname: Linux 4.10.0-9-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity:Unity7
Date: Tue Mar 7 17:24:56 2017
InstallationDate: Installed on 2016-05-06 (304 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: ubuntu-app-launch
UpgradeStatus: Upgraded to zesty on 2016-11-22 (105 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michał Sawicz (saviq)]

I'd actually like to see less environment provided by unity8-desktop-session itself in this case, and more by UAL.

So QT_QPA_PLATFORM=ubuntumirclient would only be there *if* UAL knew it was correct to be there, without the unity8 session assuming that.

[kevin gunn (kgunn72)]

a note based on recent conversation.
ltinkl confirmed that QT_QPA_PLATFORM for Qt5
so with the current state of things, it would be ideal for u-a-l not to remove this env var - and it won't effect Qt4 apps.

[Michał Sawicz (saviq)]

This bug is about something different, actually... UAL doesn't modify environment today (hence the bug)

<ChrisTownsend> Ok, libertine-launch sanitizes that since we assume if libertine-launch is used, we are using Xmir.