From 11e8b91cb0d14318e17e152c91bd959731ad0edb Mon Sep 17 00:00:00 2001
From: Aleix Pol Gonzalez <aleix.pol_gonzalez@mercedes-benz.com>
Date: Wed, 7 Jun 2023 17:27:53 +0200
Subject: [PATCH] Composite: Enforce KWIN_COMPOSE

Don't fall back into other composition systems if KWIN_COMPOSE is
explicitly set. In such case, just exit().

Signed-off-by: Victoria Fischer <victoria.fischer@mbition.io>
---
 src/composite.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/composite.cpp b/src/composite.cpp
index 883f76c1a0..734e2fe096 100644
--- a/src/composite.cpp
+++ b/src/composite.cpp
@@ -289,6 +289,9 @@ bool Compositor::setupStart()
 
         if (stop) {
             break;
+        } else if (qEnvironmentVariableIsSet("KWIN_COMPOSE")) {
+            qCCritical(KWIN_CORE) << "Could not fulfill the requested compositing mode in KWIN_COMPOSE:" << type << ". Exiting.";
+            qApp->quit();
         }
     }