all: remove some Debug fields, NetworkMap.Debug, Reconfig Debug arg

Updates #8923

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

control/controlclient/map.go

@@ -14,7 +14,6 @@ import (
 	"tailscale.com/types/key"
 	"tailscale.com/types/logger"
 	"tailscale.com/types/netmap"
-	"tailscale.com/types/opt"
 	"tailscale.com/types/views"
 	"tailscale.com/wgengine/filter"
 )
@@ -145,16 +144,6 @@ func (ms *mapSession) netmapForResponse(resp *tailcfg.MapResponse) *netmap.Netwo
 		ms.lastTKAInfo = resp.TKAInfo
 	}
 
-	debug := resp.Debug
-	if debug != nil {
-		copyDebugOptBools(&ms.stickyDebug, debug)
-	} else if ms.stickyDebug != (tailcfg.Debug{}) {
-		debug = new(tailcfg.Debug)
-	}
-	if debug != nil {
-		copyDebugOptBools(debug, &ms.stickyDebug)
-	}
-
 	nm := &netmap.NetworkMap{
 		NodeKey:           ms.privateNodeKey.Public(),
 		PrivateKey:        ms.privateNodeKey,
@@ -169,7 +158,6 @@ func (ms *mapSession) netmapForResponse(resp *tailcfg.MapResponse) *netmap.Netwo
 		SSHPolicy:         ms.lastSSHPolicy,
 		CollectServices:   ms.collectServices,
 		DERPMap:           ms.lastDERPMap,
-		Debug:             debug,
 		ControlHealth:     ms.lastHealth,
 		TKAEnabled:        ms.lastTKAInfo != nil && !ms.lastTKAInfo.Disabled,
 	}
@@ -401,12 +389,3 @@ func filterSelfAddresses(in []netip.Prefix) (ret []netip.Prefix) {
 		return ret
 	}
 }
-
-func copyDebugOptBools(dst, src *tailcfg.Debug) {
-	copy := func(v *opt.Bool, s opt.Bool) {
-		if s != "" {
-			*v = s
-		}
-	}
-	copy(&dst.OneCGNATRoute, src.OneCGNATRoute)
-}

control/controlclient/map_test.go

@@ -17,7 +17,6 @@ import (
 	"tailscale.com/tstime"
 	"tailscale.com/types/key"
 	"tailscale.com/types/netmap"
-	"tailscale.com/types/opt"
 	"tailscale.com/types/ptr"
 	"tailscale.com/util/must"
 )
@@ -470,85 +469,6 @@ func TestNetmapForResponse(t *testing.T) {
 	})
 }
 
-// TestDeltaDebug tests that tailcfg.Debug values can be omitted in MapResponses
-// entirely or have their opt.Bool values unspecified between MapResponses in a
-// session and that should mean no change. (as of capver 37). But one Debug
-// field existed prior to capver 37 that wasn't opt.Bool; we test that we both
-// still accept the non-opt.Bool form from control for RandomizeClientPort and
-// also accept the new form, keeping the old form in sync.
-func TestDeltaDebug(t *testing.T) {
-	type step struct {
-		got  *tailcfg.Debug
-		want *tailcfg.Debug
-	}
-	tests := []struct {
-		name  string
-		steps []step
-	}{
-		{
-			name: "nothing-to-nothing",
-			steps: []step{
-				{nil, nil},
-				{nil, nil},
-			},
-		},
-		{
-			name: "opt-bool-sticky-changing-over-time",
-			steps: []step{
-				{nil, nil},
-				{nil, nil},
-				{
-					&tailcfg.Debug{OneCGNATRoute: "true"},
-					&tailcfg.Debug{OneCGNATRoute: "true"},
-				},
-				{
-					nil,
-					&tailcfg.Debug{OneCGNATRoute: "true"},
-				},
-				{
-					&tailcfg.Debug{OneCGNATRoute: "false"},
-					&tailcfg.Debug{OneCGNATRoute: "false"},
-				},
-				{
-					nil,
-					&tailcfg.Debug{OneCGNATRoute: "false"},
-				},
-			},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			ms := newTestMapSession(t)
-			for stepi, s := range tt.steps {
-				nm := ms.netmapForResponse(&tailcfg.MapResponse{Debug: s.got})
-				if !reflect.DeepEqual(nm.Debug, s.want) {
-					t.Errorf("unexpected result at step index %v; got: %s", stepi, must.Get(json.Marshal(nm.Debug)))
-				}
-			}
-		})
-	}
-}
-
-// Verifies that copyDebugOptBools doesn't missing any opt.Bools.
-func TestCopyDebugOptBools(t *testing.T) {
-	rt := reflect.TypeOf(tailcfg.Debug{})
-	for i := 0; i < rt.NumField(); i++ {
-		sf := rt.Field(i)
-		if sf.Type != reflect.TypeOf(opt.Bool("")) {
-			continue
-		}
-		var src, dst tailcfg.Debug
-		reflect.ValueOf(&src).Elem().Field(i).Set(reflect.ValueOf(opt.Bool("true")))
-		if src == (tailcfg.Debug{}) {
-			t.Fatalf("failed to set field %v", sf.Name)
-		}
-		copyDebugOptBools(&dst, &src)
-		if src != dst {
-			t.Fatalf("copyDebugOptBools didn't copy field %v", sf.Name)
-		}
-	}
-}
-
 func TestDeltaDERPMap(t *testing.T) {
 	regions1 := map[int]*tailcfg.DERPRegion{
 		1: {