all: sync with master

internal/home/home.go

@@ -542,6 +542,11 @@ func run(opts options, clientBuildFS fs.FS) {
 		}
 	}
 
+	// TODO(a.garipov): This could be made much earlier and could be done on
+	// the first run as well, but to achieve this we need to bypass requests
+	// over dnsforward resolver.
+	cmdlineUpdate(opts)
+
 	Context.web.Start()
 
 	// wait indefinitely for other go-routines to complete their job
@@ -576,7 +581,7 @@ func checkPermissions() {
 	}
 
 	// We should check if AdGuard Home is able to bind to port 53
-	err := aghnet.CheckPort("tcp", netip.AddrPortFrom(aghnet.IPv4Localhost(), defaultPortDNS))
+	err := aghnet.CheckPort("tcp", netip.AddrPortFrom(netutil.IPv4Localhost(), defaultPortDNS))
 	if err != nil {
 		if errors.Is(err, os.ErrPermission) {
 			log.Fatal(`Permission check failed.
@@ -927,3 +932,37 @@ type jsonError struct {
 	// Message is the error message, an opaque string.
 	Message string `json:"message"`
 }
+
+// cmdlineUpdate updates current application and exits.
+func cmdlineUpdate(opts options) {
+	if !opts.performUpdate {
+		return
+	}
+
+	log.Info("starting update")
+
+	if Context.firstRun {
+		log.Info("update not allowed on first run")
+
+		os.Exit(0)
+	}
+
+	_, err := Context.updater.VersionInfo(true)
+	if err != nil {
+		vcu := Context.updater.VersionCheckURL()
+		log.Error("getting version info from %s: %s", vcu, err)
+
+		os.Exit(0)
+	}
+
+	if Context.updater.NewVersion() == "" {
+		log.Info("no updates available")
+
+		os.Exit(0)
+	}
+
+	err = Context.updater.Update()
+	fatalOnError(err)
+
+	os.Exit(0)
+}