From aa79810596d8608c1636006018f31b34197c2123 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Tue, 12 Sep 2023 14:35:19 +0200
Subject: Fix error when none of S3/K2V/WEB/ADMIN server is started (fix #613)

---
 src/garage/server.rs | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/src/garage/server.rs b/src/garage/server.rs
index 958089c6..472616c7 100644
--- a/src/garage/server.rs
+++ b/src/garage/server.rs
@@ -130,20 +130,27 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
 		warn!("This Garage version is built without the metrics feature");
 	}
 
-	// Stuff runs
-
-	// When a cancel signal is sent, stuff stops
-
-	// Collect stuff
-	for (desc, join_handle) in servers {
-		if let Err(e) = join_handle.await? {
-			error!("{} server exited with error: {}", desc, e);
-		} else {
-			info!("{} server exited without error.", desc);
+	if servers.is_empty() {
+		// Nothing runs except netapp (not in servers)
+		// Await shutdown signal before proceeding to shutting down netapp
+		wait_from(watch_cancel).await;
+	} else {
+		// Stuff runs
+
+		// When a cancel signal is sent, stuff stops
+
+		// Collect stuff
+		for (desc, join_handle) in servers {
+			if let Err(e) = join_handle.await? {
+				error!("{} server exited with error: {}", desc, e);
+			} else {
+				info!("{} server exited without error.", desc);
+			}
 		}
 	}
 
 	// Remove RPC handlers for system to break reference cycles
+	info!("Deregistering RPC handlers for shutdown...");
 	garage.system.netapp.drop_all_handlers();
 	opentelemetry::global::shutdown_tracer_provider();
 
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