Check if tun device is avaliable for installation

Author: zelahi

rootless-install.sh

@@ -61,6 +61,11 @@ checks() {
 		>&2 echo "Aborting because rootful Docker is running and accessible. Set FORCE_ROOTLESS_INSTALL=1 to ignore."; exit 1
 	fi
 
+	# Check if tun device is avaliable for rootless kit
+	if [ ! -e /dev/net/tun ] && [ -z "$FORCE_ROOTLESS_INSTALL" ]; then
+		>&2 echo "Aborting because /dev/net/tun is not avaliable.  Set FORCE_ROOTLESS_INSTALL=1 to ignore."; exit 1
+	fi  
+
 	# Validate XDG_RUNTIME_DIR
 	if [ ! -w "$XDG_RUNTIME_DIR" ]; then
 		if [ -n "$SYSTEMD" ]; then
@@ -185,9 +190,9 @@ start_docker() {
 	fi
 
 	mkdir -p $HOME/.config/systemd/user
-	
+
 	DOCKERD_FLAGS="--experimental"
-	
+
 	if [ -n "$SKIP_IPTABLES" ]; then
 		DOCKERD_FLAGS="$DOCKERD_FLAGS --iptables=false"
 	fi