Update

vendor/tailscale.com/safesocket/safesocket.go

@@ -11,6 +11,9 @@ import (
 	"net"
 	"runtime"
 	"time"
+
+	"tailscale.com/feature"
+	"tailscale.com/feature/buildfeatures"
 )
 
 type closeable interface {
@@ -31,7 +34,8 @@ func ConnCloseWrite(c net.Conn) error {
 }
 
 var processStartTime = time.Now()
-var tailscaledProcExists = func() bool { return false } // set by safesocket_ps.go
+
+var tailscaledProcExists feature.Hook[func() bool]
 
 // tailscaledStillStarting reports whether tailscaled is probably
 // still starting up. That is, it reports whether the caller should
@@ -50,7 +54,8 @@ func tailscaledStillStarting() bool {
 	if d > 5*time.Second {
 		return false
 	}
-	return tailscaledProcExists()
+	f, ok := tailscaledProcExists.GetOk()
+	return ok && f()
 }
 
 // ConnectContext connects to tailscaled using a unix socket or named pipe.
@@ -104,7 +109,12 @@ func LocalTCPPortAndToken() (port int, token string, err error) {
 
 // PlatformUsesPeerCreds reports whether the current platform uses peer credentials
 // to authenticate connections.
-func PlatformUsesPeerCreds() bool { return GOOSUsesPeerCreds(runtime.GOOS) }
+func PlatformUsesPeerCreds() bool {
+	if !buildfeatures.HasUnixSocketIdentity {
+		return false
+	}
+	return GOOSUsesPeerCreds(runtime.GOOS)
+}
 
 // GOOSUsesPeerCreds is like PlatformUsesPeerCreds but takes a
 // runtime.GOOS value instead of using the current one.