Add support to option enable_multiple_session

references/daemon.conf

@@ -21,6 +21,11 @@ default_session_command = "/usr/bin/diyac -x /usr/bin/diya-login-shell"
 # if this setting is not set
 default_session_user = "xdg"
 
+# if false keep only one session at a time
+# open a new session will close any previously opened session
+# default true, optional
+enable_multiple_session = false
+
 # User session command
 # The command to run to start a user session after the
 # login session is successful

src/configuration.rs

@@ -23,6 +23,8 @@ pub struct Configuration {
     default_session_user: String, // optional (default root)
     /// The command to execute for user sessions (required).
     user_session_command: String,
+    /// flag to enable multiple session
+    enable_multiple_session: bool,
 }
 
 impl Configuration {
@@ -71,6 +73,10 @@ impl Configuration {
                 .and_then(Value::as_str)
                 .ok_or("Missing user session command")?
                 .to_string(),
+            enable_multiple_session: table
+                .get("enable_multiple_session")
+                .and_then(Value::as_bool)
+                .unwrap_or(true),
         })
     }
 
@@ -106,6 +112,14 @@ impl Configuration {
     pub fn user_session_command(&self) -> &str {
         &self.user_session_command
     }
+
+    /// Is multiple session enabled
+    ///
+    /// # Returns
+    /// * bool value
+    pub fn enable_multiple_session(&self) -> bool {
+        self.enable_multiple_session
+    }
 }
 
 impl fmt::Display for Configuration {
@@ -122,6 +136,11 @@ impl fmt::Display for Configuration {
         )?;
         writeln!(f, "  - Default Session User: {}", self.default_session_user)?;
         writeln!(f, "  - User Session Command: {}", self.user_session_command)?;
+        writeln!(
+            f,
+            "  - Enable multiple session: {}",
+            self.enable_multiple_session
+        )?;
         Ok(())
     }
 }

src/session.rs

@@ -402,7 +402,11 @@ impl SessionManager {
         };
         match session.authenticate() {
             Ok(()) => {
+                DEBUG!("Authenticate success");
                 invocation.return_value(Some(&Variant::tuple_from_iter([true.to_variant()])));
+                if ! self.config.enable_multiple_session() {
+                    self.drop_all_sessions();
+                }
                 match self.open_session(self.config.user_session_command(), &session) {
                     Ok(pid) => self.pids.push(pid),
                     Err(error) => CRITICAL!("Failed to run user session: {}", error),
@@ -485,11 +489,26 @@ impl SessionManager {
                 Err(error) => {
                     CRITICAL!("Unable to get session PID={} status: {}", pid, error);
                     let _ = kill(*pid, Signal::SIGKILL);
-                    let _ = waitpid(*pid, Some(WaitPidFlag::WNOHANG));
+                    let _ = waitpid(*pid, None);
                     false
                 }
             });
     }
+
+    /// Drop all opened session (including the default one)
+    ///
+    /// # Arguments
+    ///
+    /// - `&mut self` (`SessionManager`) - SessionManager
+    ///
+    fn drop_all_sessions(&mut self) {
+        DEBUG!("Dropping all running sessions");
+        // kill all running session
+        for pid in self.pids.drain(..) {
+            let _ = kill(pid, Signal::SIGKILL);
+            let _ = waitpid(pid, None);
+        }
+    }
 }
 
 impl Drop for SessionManager {
@@ -509,10 +528,7 @@ impl Drop for SessionManager {
             DEBUG!("Releasing acquired D-Bus name");
             gio::bus_unown_name(bus_owner_id);
         }
-        // kill all running session
-        for pid in self.pids.drain(..) {
-            let _ = kill(pid, Signal::SIGINT);
-        }
+        self.drop_all_sessions();
         DEBUG!("Removing signal handlers");
         for signal_id in self.signals.drain(..) {
             signal_id.remove();

src/tests.rs

@@ -19,4 +19,5 @@ fn test_configuration_loading() {
         config.user_session_command(),
         "/usr/bin/diyac -x /usr/bin/diya-shell"
     );
+    assert_eq!(config.enable_multiple_session(), false);
 }