wgengine/netstack: remove unused taildrive deps

A filesystem was plumbed into netstack in 993acf4475
but hasn't been used since 2d5d6f5403. Remove it.

Noticed while rebasing a Tailscale fork elsewhere.

Updates tailscale/corp#16827

Change-Id: Ib76deeda205ffe912b77a59b9d22853ebff42813
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

cmd/tailscaled/tailscaled.go

@@ -788,7 +788,6 @@ func runDebugServer(mux *http.ServeMux, addr string) {
 }
 
 func newNetstack(logf logger.Logf, sys *tsd.System) (*netstack.Impl, error) {
-	tfs, _ := sys.DriveForLocal.GetOK()
 	ret, err := netstack.Create(logf,
 		sys.Tun.Get(),
 		sys.Engine.Get(),
@@ -796,7 +795,6 @@ func newNetstack(logf logger.Logf, sys *tsd.System) (*netstack.Impl, error) {
 		sys.Dialer.Get(),
 		sys.DNSManager.Get(),
 		sys.ProxyMapper(),
-		tfs,
 	)
 	if err != nil {
 		return nil, err

cmd/tsconnect/wasm/wasm_js.go

@@ -115,7 +115,7 @@ func newIPN(jsConfig js.Value) map[string]any {
 	}
 	sys.Set(eng)
 
-	ns, err := netstack.Create(logf, sys.Tun.Get(), eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper(), nil)
+	ns, err := netstack.Create(logf, sys.Tun.Get(), eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper())
 	if err != nil {
 		log.Fatalf("netstack.Create: %v", err)
 	}

tsnet/tsnet.go

@@ -546,7 +546,7 @@ func (s *Server) start() (reterr error) {
 	sys.HealthTracker().SetMetricsRegistry(sys.UserMetricsRegistry())
 
 	// TODO(oxtoacart): do we need to support Taildrive on tsnet, and if so, how?
-	ns, err := netstack.Create(tsLogf, sys.Tun.Get(), eng, sys.MagicSock.Get(), s.dialer, sys.DNSManager.Get(), sys.ProxyMapper(), nil)
+	ns, err := netstack.Create(tsLogf, sys.Tun.Get(), eng, sys.MagicSock.Get(), s.dialer, sys.DNSManager.Get(), sys.ProxyMapper())
 	if err != nil {
 		return fmt.Errorf("netstack.Create: %w", err)
 	}

wgengine/netstack/netstack.go

@@ -32,7 +32,6 @@ import (
 	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
 	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
 	"gvisor.dev/gvisor/pkg/waiter"
-	"tailscale.com/drive"
 	"tailscale.com/envknob"
 	"tailscale.com/ipn/ipnlocal"
 	"tailscale.com/metrics"
@@ -186,7 +185,6 @@ type Impl struct {
 	ctxCancel context.CancelFunc     // called on Close
 	lb        *ipnlocal.LocalBackend // or nil
 	dns       *dns.Manager
-	driveForLocal drive.FileSystemForLocal // or nil
 
 	// loopbackPort, if non-nil, will enable Impl to loop back (dnat to
 	// <address-family-loopback>:loopbackPort) TCP & UDP flows originally
@@ -288,7 +286,7 @@ func setTCPBufSizes(ipstack *stack.Stack) error {
 }
 
 // Create creates and populates a new Impl.
-func Create(logf logger.Logf, tundev *tstun.Wrapper, e wgengine.Engine, mc *magicsock.Conn, dialer *tsdial.Dialer, dns *dns.Manager, pm *proxymap.Mapper, driveForLocal drive.FileSystemForLocal) (*Impl, error) {
+func Create(logf logger.Logf, tundev *tstun.Wrapper, e wgengine.Engine, mc *magicsock.Conn, dialer *tsdial.Dialer, dns *dns.Manager, pm *proxymap.Mapper) (*Impl, error) {
 	if mc == nil {
 		return nil, errors.New("nil magicsock.Conn")
 	}
@@ -382,7 +380,6 @@ func Create(logf logger.Logf, tundev *tstun.Wrapper, e wgengine.Engine, mc *magi
 		connsInFlightByClient: make(map[netip.Addr]int),
 		packetsInFlight:       make(map[stack.TransportEndpointID]struct{}),
 		dns:                   dns,
-		driveForLocal:         driveForLocal,
 	}
 	loopbackPort, ok := envknob.LookupInt("TS_DEBUG_NETSTACK_LOOPBACK_PORT")
 	if ok && loopbackPort >= 0 && loopbackPort <= math.MaxUint16 {

wgengine/netstack/netstack_test.go

@@ -65,7 +65,7 @@ func TestInjectInboundLeak(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	ns, err := Create(logf, tunWrap, eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper(), nil)
+	ns, err := Create(logf, tunWrap, eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -116,7 +116,7 @@ func makeNetstack(tb testing.TB, config func(*Impl)) *Impl {
 	tb.Cleanup(func() { eng.Close() })
 	sys.Set(eng)
 
-	ns, err := Create(logf, sys.Tun.Get(), eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper(), nil)
+	ns, err := Create(logf, sys.Tun.Get(), eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper())
 	if err != nil {
 		tb.Fatal(err)
 	}