os release thingy at bottom

interface.ui

@@ -78,6 +78,9 @@
                   <object class="GtkLabel" id="message_label">
                       <property name="visible">True</property>
 		      <property name="label"></property>
+		      <style>
+	                <class name="msg"/>
+		      </style>
                   </object>
                 </child>
               </object>

src/main.rs

@@ -6,6 +6,8 @@ use lightdm;
 use lightdm::{GreeterExt, SessionExt, UserExt, UserListExt};
 use std::cell::RefCell;
 use std::rc::Rc;
+use std::{fs,io};
+use std::io::prelude::*;
 
 fn main() {
     if gtk::init().is_err() {
@@ -22,6 +24,12 @@ fn main() {
         handler_borrowed.setup_greeter(handler.clone());
         handler_borrowed.setup_de_select(handler.clone());
     }
+    {
+        let handler_borrowed = handler.borrow();
+        if let Ok(os_str) = pretty_name() {
+            handler_borrowed.msg_label.as_ref().expect("no msg label").set_text(&os_str);
+        }
+    }
     {
         let handler_borrowed = handler.borrow();
         let greeter = handler_borrowed.greeter.as_ref().expect("no greeter");
@@ -217,3 +225,20 @@ impl Handler {
         vbox.show_all()
     }
 }
+
+fn pretty_name() -> Result<String, io::Error> {
+    let file = fs::File::open("/etc/os-release")?;
+    let contents = io::BufReader::new(file);
+    for line_opt in contents.lines() {
+        let line = line_opt?;
+        if line.starts_with("PRETTY_NAME=") {
+            if let Some(name) = line.split("=").skip(1).next() {
+                return Ok(name.trim_matches('"').to_string());
+            };
+        }
+    }
+    Err(io::Error::new(
+        io::ErrorKind::NotFound,
+        "I tried my best :)",
+    ))
+}

style.css

@@ -51,3 +51,8 @@ popover {
 popover radiobutton {
     padding: 1em;
 }
+
+.msg {
+    font-size: 1.5em;
+    padding: 1em;
+}