Show both sign-ins on the first screen and find servers automatically

cmd/byre/serve.go

@@ -14,6 +14,7 @@ import (
 	"os/signal"
 	"path/filepath"
 	"strings"
+	"sync"
 	"syscall"
 	"time"
 
@@ -52,9 +53,7 @@ func serveCmd(args []string) {
 	ts := &tsnet.Server{
 		Dir:      filepath.Join(*dataDir, "tsnet"),
 		Hostname: *hostname,
-		UserLogf: func(format string, args ...any) {
-			slog.Info("tsnet", "msg", fmt.Sprintf(format, args...))
-		},
+		UserLogf: tsnetLogf(),
 	}
 	err = ts.Start()
 	if err != nil {
@@ -124,6 +123,22 @@ func serveTailnet(ctx context.Context, ts *tsnet.Server, hs *http.Server) {
 	}
 }
 
+func tsnetLogf() func(string, ...any) {
+	mu := sync.Mutex{}
+	last := ""
+	return func(format string, args ...any) {
+		msg := fmt.Sprintf(format, args...)
+		mu.Lock()
+		repeat := msg == last
+		last = msg
+		mu.Unlock()
+		if repeat {
+			return
+		}
+		slog.Info("tsnet", "msg", msg)
+	}
+}
+
 func macSlug() string {
 	out, err := exec.Command("scutil", "--get", "ComputerName").Output()
 	if err != nil {