cmd/tailscale, ipn/ipnlocal: add ts_omit_webclient

Fixes #17063
Updates #12614

Change-Id: I0a189f6a4d1c4558351e3195839867725774fa96
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

cmd/tailscale/cli/cli.go

@@ -209,6 +209,7 @@ func noDupFlagify(c *ffcli.Command) {
 
 var fileCmd func() *ffcli.Command
 var sysPolicyCmd func() *ffcli.Command
+var maybeWebCmd func() *ffcli.Command
 
 func newRootCmd() *ffcli.Command {
 	rootfs := newFlagSet("tailscale")
@@ -251,7 +252,7 @@ change in the future.
 			funnelCmd(),
 			serveCmd(),
 			versionCmd,
-			webCmd,
+			nilOrCall(maybeWebCmd),
 			nilOrCall(fileCmd),
 			bugReportCmd,
 			certCmd,

cmd/tailscale/cli/set.go

@@ -15,13 +15,13 @@ import (
 	"strings"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/web"
 	"tailscale.com/clientupdate"
 	"tailscale.com/cmd/tailscale/cli/ffcomplete"
 	"tailscale.com/ipn"
 	"tailscale.com/net/netutil"
 	"tailscale.com/net/tsaddr"
 	"tailscale.com/safesocket"
+	"tailscale.com/tsconst"
 	"tailscale.com/types/opt"
 	"tailscale.com/types/ptr"
 	"tailscale.com/types/views"
@@ -264,7 +264,7 @@ func runSet(ctx context.Context, args []string) (retErr error) {
 	}
 
 	if setArgs.runWebClient && len(st.TailscaleIPs) > 0 {
-		printf("\nWeb interface now running at %s:%d\n", st.TailscaleIPs[0], web.ListenPort)
+		printf("\nWeb interface now running at %s:%d\n", st.TailscaleIPs[0], tsconst.WebListenPort)
 	}
 
 	return nil

cmd/tailscale/cli/web.go

@@ -1,6 +1,8 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
+//go:build !ts_omit_webclient
+
 package cli
 
 import (
@@ -22,14 +24,20 @@ import (
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"tailscale.com/client/web"
 	"tailscale.com/ipn"
+	"tailscale.com/tsconst"
 )
 
-var webCmd = &ffcli.Command{
-	Name:       "web",
-	ShortUsage: "tailscale web [flags]",
-	ShortHelp:  "Run a web server for controlling Tailscale",
+func init() {
+	maybeWebCmd = webCmd
+}
 
-	LongHelp: strings.TrimSpace(`
+func webCmd() *ffcli.Command {
+	return &ffcli.Command{
+		Name:       "web",
+		ShortUsage: "tailscale web [flags]",
+		ShortHelp:  "Run a web server for controlling Tailscale",
+
+		LongHelp: strings.TrimSpace(`
 "tailscale web" runs a webserver for controlling the Tailscale daemon.
 
 It's primarily intended for use on Synology, QNAP, and other
@@ -37,16 +45,17 @@ NAS devices where a web interface is the natural place to control
 Tailscale, as opposed to a CLI or a native app.
 `),
 
-	FlagSet: (func() *flag.FlagSet {
-		webf := newFlagSet("web")
-		webf.StringVar(&webArgs.listen, "listen", "localhost:8088", "listen address; use port 0 for automatic")
-		webf.BoolVar(&webArgs.cgi, "cgi", false, "run as CGI script")
-		webf.StringVar(&webArgs.prefix, "prefix", "", "URL prefix added to requests (for cgi or reverse proxies)")
-		webf.BoolVar(&webArgs.readonly, "readonly", false, "run web UI in read-only mode")
-		webf.StringVar(&webArgs.origin, "origin", "", "origin at which the web UI is served (if behind a reverse proxy or used with cgi)")
-		return webf
-	})(),
-	Exec: runWeb,
+		FlagSet: (func() *flag.FlagSet {
+			webf := newFlagSet("web")
+			webf.StringVar(&webArgs.listen, "listen", "localhost:8088", "listen address; use port 0 for automatic")
+			webf.BoolVar(&webArgs.cgi, "cgi", false, "run as CGI script")
+			webf.StringVar(&webArgs.prefix, "prefix", "", "URL prefix added to requests (for cgi or reverse proxies)")
+			webf.BoolVar(&webArgs.readonly, "readonly", false, "run web UI in read-only mode")
+			webf.StringVar(&webArgs.origin, "origin", "", "origin at which the web UI is served (if behind a reverse proxy or used with cgi)")
+			return webf
+		})(),
+		Exec: runWeb,
+	}
 }
 
 var webArgs struct {
@@ -101,7 +110,7 @@ func runWeb(ctx context.Context, args []string) error {
 	var startedManagementClient bool // we started the management client
 	if !existingWebClient && !webArgs.readonly {
 		// Also start full client in tailscaled.
-		log.Printf("starting tailscaled web client at http://%s\n", netip.AddrPortFrom(selfIP, web.ListenPort))
+		log.Printf("starting tailscaled web client at http://%s\n", netip.AddrPortFrom(selfIP, tsconst.WebListenPort))
 		if err := setRunWebClient(ctx, true); err != nil {
 			return fmt.Errorf("starting web client in tailscaled: %w", err)
 		}

cmd/tailscaled/deps_test.go

@@ -4,6 +4,7 @@
 package main
 
 import (
+	"strings"
 	"testing"
 
 	"tailscale.com/tstest/deptest"
@@ -41,3 +42,22 @@ func TestOmitSyspolicy(t *testing.T) {
 		},
 	}.Check(t)
 }
+
+// Test that we can build a binary without reflect.MethodByName.
+// See https://github.com/tailscale/tailscale/issues/17063
+func TestOmitReflectThings(t *testing.T) {
+	deptest.DepChecker{
+		GOOS:   "linux",
+		GOARCH: "amd64",
+		Tags:   "ts_include_cli,ts_omit_systray,ts_omit_debugeventbus,ts_omit_webclient",
+		BadDeps: map[string]string{
+			"text/template": "unexpected text/template usage",
+			"html/template": "unexpected text/template usage",
+		},
+		OnDep: func(dep string) {
+			if strings.Contains(dep, "systray") {
+				t.Errorf("unexpected systray dep %q", dep)
+			}
+		},
+	}.Check(t)
+}