Merge lp:~larryprice/libertine/blacklist-env-vars into lp:libertine

[Larry Price]

Blacklist Mir-related environment variables that interfere with X apps.

Blacklist Mir-related environment variables that wreak havoc on X applications. Test with QtCreator

Adapted from bregma's branch at https://code.launchpad.net/~bregma/libertine/lp-1540091.

[Libertine CI Bot (libertine-ci-bot)]

PASSED: Continuous integration, rev:172
https://jenkins.canonical.com/libertine/job/libertine-ci-verify-mp/208/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/libertine/job/generic-ci-generate-dsc/211
    SUCCESS: https://jenkins.canonical.com/libertine/job/libertine-ci-build-and-test-dsc/architecture=amd64,distribution=vivid,label_exp=jenkins-slave-0%20%7C%7C%20jenkins-slave-2/170
    SUCCESS: https://jenkins.canonical.com/libertine/job/libertine-ci-build-and-test-dsc/architecture=amd64,distribution=xenial,label_exp=jenkins-slave-0%20%7C%7C%20jenkins-slave-2/170
    SUCCESS: https://jenkins.canonical.com/libertine/job/libertine-ci-build-and-test-dsc/architecture=i386,distribution=vivid,label_exp=jenkins-slave-0%20%7C%7C%20jenkins-slave-2/170
    SUCCESS: https://jenkins.canonical.com/libertine/job/libertine-ci-build-and-test-dsc/architecture=i386,distribution=xenial,label_exp=jenkins-slave-0%20%7C%7C%20jenkins-slave-2/170
    None: https://jenkins.canonical.com/libertine/job/libertine-ci-update-mp/1106/console

Click here to trigger a rebuild:
https://jenkins.canonical.com/libertine/job/libertine-ci-verify-mp/208/rebuild

review: Approve (continuous-integration)

[Brandon Schaefer (brandontschaefer)]

Tested out qtcreator and went from not working to working! yay. +1 from me

review: Approve

=== modified file 'tools/libertine-launch'
--- tools/libertine-launch	2016-04-11 15:01:38 +0000
+++ tools/libertine-launch	2016-05-05 21:02:05 +0000
@@ -69,6 +69,11 @@
     if not libertine.utils.container_exists(args.container_id):
         raise RuntimeError("Container ID %s does not exist." % args.container_id)
 
+    # remove problematic environment variables
+    for e in ['QT_QPA_PLATFORM', 'LD_LIBRARY_PATH', 'FAKECHROOT_BASE', 'FAKECHROOT_CMD_SUBST']:
+        if e in os.environ:
+            del os.environ[e]
+
     session_socket_path = set_dbus_session_socket_path()
 
     session_bridge = launch_libertine_session_bridge(session_socket_path)