create-notification: Backwards compatibility

Accept single language as well as both. But warn in such case.

mail_notifier/create_notification

@@ -3,9 +3,9 @@
 base_dir=/tmp/user_notify
 
 usage() {
-	echo "This program serves for creating messages which will be send to the user."
-	echo "Usage:"
-	echo -e "\t $0 -s [restart,error,update,news] 'Czech text of the message' 'English text of the message'"
+	echo "This program serves for creating messages which will be send to the user." >&2
+	echo "Usage:" >&2
+	echo -e "\t $0 -s [restart,error,update,news] 'Czech text of the message' 'English text of the message'" >&2
 }
 
 trigger=false
@@ -20,9 +20,14 @@ if [ "$1" = -d ] ; then
 	shift 2
 fi
 
-if [ $# -ne 4 ]; then
+if [ $# -eq 3 ]; then
+	echo "Backwards compatibility mode: using only single language. Please provide both languages." >&2
+	compat=true
+elif [ $# -ne 4 ]; then
 	usage
 	exit 1
+else
+	compat=false
 fi
 
 if [ "$1" = "-s" ]; then
@@ -45,8 +50,12 @@ msg_id="$(/bin/busybox date +%s)-$$"
 mkdir -p "$base_dir"
 mkdir "$base_dir/tmp.$msg_id"
 echo "$severity" > "$base_dir/tmp.$msg_id/severity"
-echo "$message_cs" > "$base_dir/tmp.$msg_id/message_cs"
-echo "$message_en" > "$base_dir/tmp.$msg_id/message_en"
+if $compat ; then
+	echo "$message_cs" > "$base_dir/tmp.$msg_id/message"
+else
+	echo "$message_cs" > "$base_dir/tmp.$msg_id/message_cs"
+	echo "$message_en" > "$base_dir/tmp.$msg_id/message_en"
+fi
 
 mv "$base_dir/tmp.$msg_id" "$base_dir/$msg_id"