all: add ts_omit_tailnetlock as a start of making it build-time modular

Updates #17115

Change-Id: I6b083c0db4c4d359e49eb129d626b7f128f0a9d2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

ipn/ipnlocal/local.go

@@ -82,7 +82,6 @@ import (
 	"tailscale.com/posture"
 	"tailscale.com/syncs"
 	"tailscale.com/tailcfg"
-	"tailscale.com/tka"
 	"tailscale.com/tsd"
 	"tailscale.com/tstime"
 	"tailscale.com/types/appctype"
@@ -7179,53 +7178,6 @@ func (b *LocalBackend) SwitchProfile(profile ipn.ProfileID) error {
 	return b.resetForProfileChangeLockedOnEntry(unlock)
 }
 
-func (b *LocalBackend) initTKALocked() error {
-	cp := b.pm.CurrentProfile()
-	if cp.ID() == "" {
-		b.tka = nil
-		return nil
-	}
-	if b.tka != nil {
-		if b.tka.profile == cp.ID() {
-			// Already initialized.
-			return nil
-		}
-		// As we're switching profiles, we need to reset the TKA to nil.
-		b.tka = nil
-	}
-	root := b.TailscaleVarRoot()
-	if root == "" {
-		b.tka = nil
-		b.logf("network-lock unavailable; no state directory")
-		return nil
-	}
-
-	chonkDir := b.chonkPathLocked()
-	if _, err := os.Stat(chonkDir); err == nil {
-		// The directory exists, which means network-lock has been initialized.
-		storage, err := tka.ChonkDir(chonkDir)
-		if err != nil {
-			return fmt.Errorf("opening tailchonk: %v", err)
-		}
-		authority, err := tka.Open(storage)
-		if err != nil {
-			return fmt.Errorf("initializing tka: %v", err)
-		}
-		if err := authority.Compact(storage, tkaCompactionDefaults); err != nil {
-			b.logf("tka compaction failed: %v", err)
-		}
-
-		b.tka = &tkaState{
-			profile:   cp.ID(),
-			authority: authority,
-			storage:   storage,
-		}
-		b.logf("tka initialized at head %x", authority.Head())
-	}
-
-	return nil
-}
-
 // resetDialPlan resets the dialPlan for this LocalBackend. It will log if
 // anything is reset.
 //

ipn/ipnlocal/network-lock.go

@@ -1,6 +1,8 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
+//go:build !ts_omit_tailnetlock
+
 package ipnlocal
 
 import (
@@ -56,6 +58,53 @@ type tkaState struct {
 	filtered  []ipnstate.TKAPeer
 }
 
+func (b *LocalBackend) initTKALocked() error {
+	cp := b.pm.CurrentProfile()
+	if cp.ID() == "" {
+		b.tka = nil
+		return nil
+	}
+	if b.tka != nil {
+		if b.tka.profile == cp.ID() {
+			// Already initialized.
+			return nil
+		}
+		// As we're switching profiles, we need to reset the TKA to nil.
+		b.tka = nil
+	}
+	root := b.TailscaleVarRoot()
+	if root == "" {
+		b.tka = nil
+		b.logf("network-lock unavailable; no state directory")
+		return nil
+	}
+
+	chonkDir := b.chonkPathLocked()
+	if _, err := os.Stat(chonkDir); err == nil {
+		// The directory exists, which means network-lock has been initialized.
+		storage, err := tka.ChonkDir(chonkDir)
+		if err != nil {
+			return fmt.Errorf("opening tailchonk: %v", err)
+		}
+		authority, err := tka.Open(storage)
+		if err != nil {
+			return fmt.Errorf("initializing tka: %v", err)
+		}
+		if err := authority.Compact(storage, tkaCompactionDefaults); err != nil {
+			b.logf("tka compaction failed: %v", err)
+		}
+
+		b.tka = &tkaState{
+			profile:   cp.ID(),
+			authority: authority,
+			storage:   storage,
+		}
+		b.logf("tka initialized at head %x", authority.Head())
+	}
+
+	return nil
+}
+
 // tkaFilterNetmapLocked checks the signatures on each node key, dropping
 // nodes from the netmap whose signature does not verify.
 //

ipn/ipnlocal/network-lock_test.go

@@ -1,6 +1,8 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
+//go:build !ts_omit_tailnetlock
+
 package ipnlocal
 
 import (

ipn/ipnlocal/tailnetlock_disabled.go

@@ -0,0 +1,31 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build ts_omit_tailnetlock
+
+package ipnlocal
+
+import (
+	"tailscale.com/ipn"
+	"tailscale.com/ipn/ipnstate"
+	"tailscale.com/tka"
+	"tailscale.com/types/netmap"
+)
+
+type tkaState struct {
+	authority *tka.Authority
+}
+
+func (b *LocalBackend) initTKALocked() error {
+	return nil
+}
+
+func (b *LocalBackend) tkaSyncIfNeeded(nm *netmap.NetworkMap, prefs ipn.PrefsView) error {
+	return nil
+}
+
+func (b *LocalBackend) tkaFilterNetmapLocked(nm *netmap.NetworkMap) {}
+
+func (b *LocalBackend) NetworkLockStatus() *ipnstate.NetworkLockStatus {
+	return &ipnstate.NetworkLockStatus{Enabled: false}
+}