fix: bridge failure to shutdown on file permission denied (#243)

* feat: print `persistence_path` in banner

* fix: permission denied causes bridge only failure

Author: Devdutt Shenoi

uplink/src/base/bridge/mod.rs

@@ -267,7 +267,6 @@ impl Bridge {
             None => return Ok(()),
         };
         let mut path = self.config.persistence_path.clone();
-        fs::create_dir_all(&path)?;
         path.push("current_action");
         info!("Storing current action in persistence; path: {}", path.display());
         current_action.write_to_disk(path)?;

uplink/src/lib.rs

@@ -158,6 +158,14 @@ pub mod config {
 
         let mut config: Config = config.try_deserialize()?;
 
+        // Create directory at persistence_path if it doesn't already exist
+        fs::create_dir_all(&config.persistence_path).map_err(|_| {
+            anyhow::Error::msg(format!(
+                "Permission denied for creating persistence directory at \"{}\"",
+                config.persistence_path.display()
+            ))
+        })?;
+
         // replace placeholders with device/tenant ID
         let tenant_id = config.project_id.trim();
         let device_id = config.device_id.trim();

uplink/src/main.rs

@@ -68,6 +68,7 @@ fn banner(commandline: &CommandLine, config: &Arc<Config>) {
     println!("    project_id: {}", config.project_id);
     println!("    device_id: {}", config.device_id);
     println!("    remote: {}:{}", config.broker, config.port);
+    println!("    persistence_path: {}", config.persistence_path.display());
     if !config.action_redirections.is_empty() {
         println!("    action redirections:");
         for (action, redirection) in config.action_redirections.iter() {