Added instructions to install udev rules for immutable systems

Author: Clément Villemur

Documentation/UdevRules.md

@@ -10,7 +10,7 @@ If you are using OpenRGB compiled from source (not as part of a package), using
 
   * If you have installed OpenRGB from a package then latest udev rules are installed locally at `/usr/lib/udev/rules.d/60-openrgb.rules`
   * Udev rules are built from the source at compile time. When building locally they are installed with the `make install` step to `/usr/lib/udev/rules.d/60-openrgb.rules`
-  * If you need to install the udev rules file manually you can also download the [latest compiled udev rules](https://gitlab.com/CalcProgrammer1/OpenRGB/-/jobs/artifacts/master/raw/60-openrgb.rules?job=Linux+64+AppImage&inline=false) from Gitlab.
-    - Copy this 60-openrgb.rules file to `/usr/lib/udev/rules.d/`
+  * If you need to install the udev rules file manually you can also download the [latest compiled udev rules](https://gitlab.com/CalcProgrammer1/OpenRGB/-/jobs/artifacts/master/raw/60-openrgb.rules?job=Linux+amd64+AppImage&inline=false) from Gitlab.
+    - Copy this 60-openrgb.rules file to `/usr/lib/udev/rules.d/` or to `/etc/udev/rules.d/` if you're on an immutable system.
     - Then reload rules with `sudo udevadm control --reload-rules && sudo udevadm trigger`
   * There is also a [udev rules installation script available at openrgb.org](https://openrgb.org/udev.html).

scripts/openrgb-udev-install.sh

@@ -1,34 +1,17 @@
 #! /bin/bash
 
-STEAMOS=0
-STEAMOS_READONLY=0
-
-# Test for SteamOS and disable readonly mode if we're running on it
-if command -v steamos-readonly >& /dev/null
-then
-	# Test if SteamOS readonly mode is enabled
-	if sudo steamos-readonly status | grep 'enabled'
-	then
-		echo "steamos readonly mode is true"
-		STEAMOS_READONLY=1
-	fi
-
-	STEAMOS=1
-	sudo steamos-readonly disable
-fi
-
 # Download udev rules file
 wget https://openrgb.org/releases/release_0.9/60-openrgb.rules
 
-# Move udev rules file to udev rules directory
-sudo mv 60-openrgb.rules /usr/lib/udev/rules.d
+# If we don't have write permissions then we're running on an immutable distro
+if sudo test -w /usr/lib/udev/rules.d;
+then
+	# Move udev rules file to udev rules directory
+	sudo mv 60-openrgb.rules /usr/lib/udev/rules.d
+else
+	sudo mv 60-openrgb.rules /etc/udev/rules.d
+fi
 
 # Reload the rules
 sudo udevadm control --reload-rules
 sudo udevadm trigger
-
-if [ "$STEAMOS" = 1 ] ; then
-	if [ "$STEAMOS_READONLY" = 1 ] ; then
-		sudo steamos-readonly enable
-	fi
-fi