user_manager: Start bringing up user manager

com.steampowered.SteamOSManager1.xml

@@ -254,4 +254,25 @@
 
   </interface>
 
+  <!--
+      com.steampowered.SteamOSManager1.UserManager
+      @short_description: Interface to control various aspects of SteamOS running as a user.
+
+	  Version available: 8
+  -->
+  <interface name="com.steampowered.SteamOSManager1.UserManager">
+
+    <!--
+        Version:
+
+        The version of this interface implemented by this object.
+
+        The manager may not support the latest version of the API.
+        Each method/property has an associated version number that
+        denotes in which interface version it first became available.
+    -->
+    <property name="Version" type="u" access="read"/>
+
+  </interface>
+
 </node>

src/main.rs

@@ -25,12 +25,13 @@ mod root;
 mod sls;
 mod systemd;
 mod user;
+mod user_manager;
 mod wifi;
 
 #[cfg(test)]
 mod testing;
 
-const API_VERSION: u32 = 7;
+const API_VERSION: u32 = 8;
 
 trait Service
 where

src/user.rs

@@ -13,12 +13,18 @@ use zbus::connection::Connection;
 use zbus::ConnectionBuilder;
 
 use crate::daemon::Daemon;
+use crate::user_manager::SteamOSManagerUser;
 
 async fn create_connection() -> Result<Connection> {
     let connection = ConnectionBuilder::session()?
         .name("com.steampowered.SteamOSManager1")?
         .build()
         .await?;
+    let manager = SteamOSManagerUser::new(connection.clone()).await?;
+    connection
+        .object_server()
+        .at("/com/steampowered/SteamOSManager1/User", manager)
+        .await?;
     Ok(connection)
 }
 

src/user_manager.rs

@@ -0,0 +1,30 @@
+/*
+ * Copyright © 2023 Collabora Ltd.
+ * Copyright © 2024 Valve Software
+ * Copyright © 2024 Igalia S.L.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+use anyhow::Result;
+use zbus::{interface, Connection};
+
+use crate::API_VERSION;
+
+pub struct SteamOSManagerUser {
+    connection: Connection,
+}
+
+impl SteamOSManagerUser {
+    pub async fn new(connection: Connection) -> Result<Self> {
+        Ok(SteamOSManagerUser { connection })
+    }
+}
+
+#[interface(name = "com.steampowered.SteamOSManager1.UserManager")]
+impl SteamOSManagerUser {
+    #[zbus(property(emits_changed_signal = "const"))]
+    async fn version(&self) -> u32 {
+        API_VERSION
+    }
+}