fix: lock before upload to ensure only one client is uploading at once

src/subcommands/main_subcommand.rs

@@ -146,6 +146,12 @@ impl CustomTransferAgent for MainSubcommand {
         info!("Attempting to compress the source file.");
         let compressed_source_path = self.compress_file(&event_source_path).await?;
 
+        // This is a System wide, cross-process lock.
+        // This is done to improve stability. We may be able to have more than one process
+        // in this method at a time, but it is unknown how many before we overwhelm the NAS and get a broken connection.
+        let lock = NamedLock::create("git-lfs-synology::MainSubcommand::upload")?;
+        let _guard = lock.lock()?;
+
         let source_path = Path::new(&compressed_source_path);
         let file_station = self.file_station.clone().context("File Station should not be null")?;
         file_station.upload(source_path, event.size.context("Size should not be null")?, configuration.path.as_str(), false, false, None, None, None, Some(progress_reporter)).await?;