Merge lp:~3v1n0/nux/x11-conffile-on-unity-only-ab into lp:nux/bionic

[Marco Trevisan (Treviño)]

X11-check-unity-support: only run when called from an unity session

The content of $XDG_CURRENT_DESKTOP is checked inside a sub-shell
not to affect the value of IFS for all the scripts sourced by the X session.

If running in Unity we should call unity_support_test, not inside gnome
ubuntu X sessions.

XDG_CURRENT_DESKTOP values are currently the followings:
 - unity before 17.10: Unity
 - unity after 17.10: Unity:Unity7:ubuntu
 - gnome session: GNOME
 - ubuntu gnome session: ubuntu:GNOME

Backport to Bionic

[lp:~3v1n0/nux/x11-conffile-on-unity-only-ab]

894. By Marco Trevisan (Treviño) on 2018-06-13

Revert: "debian: don't consider the Xsession.d script as a config file anymore"

It seems something there's not full agreement on it, so to avoid further discussions
I'm reverting this back. However I strongly believe that given the current tools we have
this is the way to go, as debian doesn't provide other tools to get this done.
Nor X11 can move files outside of /etc.

[Marco Trevisan (Treviño) (3v1n0)]

Self approving as per what Laney already did here

https://code.launchpad.net/~3v1n0/nux/x11-conffile-on-unity-only/+merge/347863

review: Approve

=== modified file 'debian/50_check_unity_support'
--- debian/50_check_unity_support	2013-08-12 11:20:24 +0000
+++ debian/50_check_unity_support	2018-06-13 12:17:38 +0000
@@ -2,6 +2,18 @@
 # If the hardware does not pass unity_support_test, fall back to LLVMpipe
 # which does.
 
-if [ "x$DESKTOP_SESSION" = "xubuntu" ]; then
-    /usr/lib/nux/unity_support_test || export LIBGL_ALWAYS_SOFTWARE=1
+if [ "x$DESKTOP_SESSION" = "xubuntu" ] && [ -x "/usr/lib/nux/unity_support_test" ]; then
+    (
+        IFS=':'
+        for d in $XDG_CURRENT_DESKTOP; do
+            if [ "x$d" = "xUnity" ] || [ "x$d" = "xUnity7" ]; then
+                return 0
+            fi
+        done
+        return 1
+    )
+
+    if [ $? = 0 ]; then
+        /usr/lib/nux/unity_support_test || export LIBGL_ALWAYS_SOFTWARE=1
+    fi
 fi

=== modified file 'debian/changelog'
--- debian/changelog	2017-09-22 13:12:54 +0000
+++ debian/changelog	2018-06-13 12:17:38 +0000
@@ -1,3 +1,12 @@
+nux (4.0.8+17.10.20170922-0ubuntu2) UNRELEASED; urgency=medium
+
+  * debian/50_check_unity_support:
+    - various changes to fix (LP: #1768610):
+      + export LIBGL_ALWAYS_SOFTWARE=1 only on command failure
+      + run only when called inside an unity session
+
+ -- Marco Trevisan (Treviño) <[e-mail]>  Wed, 13 Jun 2018 03:35:45 +0200
+
 nux (4.0.8+17.10.20170922-0ubuntu1) artful; urgency=medium
 
   * Nux: mark explicit fallthrough jumps (to please gcc7)