From a74d9c29c735c14d93302cb06257f7d22d8516f2 Mon Sep 17 00:00:00 2001
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Date: Tue, 17 Apr 2018 21:37:05 +0200
Subject: Provide means to configure a required memory threshold. If the system
 is below that threshold, desktop autoloader won't run. Starting with a
 default value of 2048MiB for this threshold.

---
 bin/desktop-autoloader             | 9 +++++++++
 contrib/desktop-autoloader.default | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/bin/desktop-autoloader b/bin/desktop-autoloader
index 9a13de1..0ab6390 100755
--- a/bin/desktop-autoloader
+++ b/bin/desktop-autoloader
@@ -21,6 +21,7 @@
 # Boston, MA  02110-1301 USA
 
 DESKTOP_AUTOLOADER_ENABLE=false
+REQUIRED_MEMORY_THRESHOLD=2048
 AUTOLOAD_DISPLAY=":20"
 DESKTOP_SESSION_MANAGER="x-session-manager"
 
@@ -38,6 +39,14 @@ if ! is_true "$DESKTOP_AUTOLOADER_ENABLE"; then
 	exit 0
 fi
 
+AVAILABLE_SYSTEM_MEMORY=$(free -m  | grep Mem | awk '{print $2}')
+
+if [ ! "${AVAILABLE_SYSTEM_MEMORY}" -gt "${REQUIRED_MEMORY_THRESHOLD}" ]; then
+	echo "Desktop Autoloader is configured to only run on systems with more than ${REQUIRED_MEMORY_THRESHOLD} MiB of RAM."
+	echo "This system only has ${AVAILABLE_SYSTEM_MEMORY} MiB."
+	exit 0
+fi
+
 # clean up .xsession-errors for a new launch (in case this tool is used
 # on a non-diskless machine...
 if [ "$(id -un)" == "desktop-autoloader" ]; then
diff --git a/contrib/desktop-autoloader.default b/contrib/desktop-autoloader.default
index c41a590..c26c15f 100644
--- a/contrib/desktop-autoloader.default
+++ b/contrib/desktop-autoloader.default
@@ -6,6 +6,9 @@
 # The autoloader is disabled by default. Enable it here (s/false/true/).
 #DESKTOP_AUTOLOADER_ENABLED=false
 
+# Only run the Desktop Autoloader if the available RAM is above this threshold (in MiB)
+#REQUIRED_MEMORY_THRESHOLD=2048
+
 # The virtual display to be used for the autoloader session.
 AUTOLOAD_DISPLAY=:20
 
-- 
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