logger: Allow journald output to be disabled at runtime

src/logger/mod.rs

@@ -29,18 +29,22 @@ pub fn init_logger() -> Result<()> {
 
     let fmt_layer = fmt::layer().compact();
 
-    match journald::layer() {
-        Ok(journald_layer) => tracing_subscriber::registry()
+    match (!crate::utils::env::bool_var("COSMIC_DISABLE_JOURNALD").unwrap_or(false))
+        .then(|| journald::layer())
+    {
+        Some(Ok(journald_layer)) => tracing_subscriber::registry()
             .with(fmt_layer)
             .with(journald_layer)
             .with(filter)
             .init(),
-        Err(err) => {
+        x @ None | x @ Some(Err(_)) => {
             tracing_subscriber::registry()
                 .with(fmt_layer)
                 .with(filter)
                 .init();
-            warn!(?err, "Failed to init journald logging.");
+            if let Some(Err(err)) = x {
+                warn!(?err, "Failed to init journald logging.");
+            }
         }
     };
     log_panics::init();