Initialize all the stuff

...like D-Bus connection to system bus, env_logger, and tokio

sfsmcctl/src/main.rs

@@ -0,0 +1,28 @@
+use log::{ debug, info, warn, error };
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // env_logger initialization
+    // If running with debug profile and `RUST_LOG` environment variable isn't set, set it to "debug"
+    if cfg!(debug_assertions) && std::env::var_os(env_logger::DEFAULT_FILTER_ENV).is_none() {
+        std::env::set_var(env_logger::DEFAULT_FILTER_ENV, "debug");
+    }
+    env_logger::init();
+
+    // TODO: use clap
+
+    // Connect with D-Bus
+    let (resource, c) = dbus_tokio::connection::new_system_sync()?;
+    debug!("D-Bus unique name: {}", c.unique_name());
+
+    // Spawn a new task for the D-Bus resource
+    tokio::spawn(async move {
+        let err = resource.await;
+        panic!("Lost connection to D-Bus: {}", err);
+    });
+
+    // TODO:
+    // Perform operations
+
+    Ok(())
+}