manage namespace directory lifecycle

cmd/olliesrv/main.go

@@ -34,6 +34,10 @@ func main() {
 		fmt.Fprintln(os.Stderr, "no namespace")
 		os.Exit(1)
 	}
+	if err := os.MkdirAll(ns, 0700); err != nil {
+		fmt.Fprintf(os.Stderr, "create namespace: %v\n", err)
+		os.Exit(1)
+	}
 
 	sockPath := filepath.Join(ns, serviceName)
 	runServer(sockPath)
@@ -149,5 +153,9 @@ func runServer(sockPath string) {
 		srv.Kill()
 	}
 	os.Remove(sockPath)
+	// Remove only an empty namespace directory. A plumber or another Plan 9
+	// service may own other entries here; os.Remove never removes non-empty
+	// directories, so those entries are left untouched.
+	_ = os.Remove(filepath.Dir(sockPath))
 	sink.Flush()
 }