cmd/tailscale/cli: move systray configuration to tailscale configure (#16817)

Updates #1708

Signed-off-by: Claus Lensbøl <claus@tailscale.com>

cmd/tailscale/cli/configure.go

@@ -32,6 +32,7 @@ services on the host to use Tailscale in more ways.
 			ccall(maybeSysExtCmd),
 			ccall(maybeVPNConfigCmd),
 			ccall(maybeJetKVMConfigureCmd),
+			ccall(maybeSystrayCmd),
 		),
 	}
 }

cmd/tailscale/cli/configure_linux-all.go

@@ -0,0 +1,8 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+package cli
+
+import "github.com/peterbourgon/ff/v3/ffcli"
+
+var maybeSystrayCmd func() *ffcli.Command // non-nil only on Linux, see configure_linux.go

cmd/tailscale/cli/configure_linux.go

@@ -0,0 +1,51 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build linux && !ts_omit_systray
+
+package cli
+
+import (
+	"context"
+	"flag"
+	"fmt"
+
+	"github.com/peterbourgon/ff/v3/ffcli"
+	"tailscale.com/client/systray"
+)
+
+func init() {
+	maybeSystrayCmd = systrayConfigCmd
+}
+
+var systrayArgs struct {
+	initSystem     string
+	installStartup bool
+}
+
+func systrayConfigCmd() *ffcli.Command {
+	return &ffcli.Command{
+		Name:       "systray",
+		ShortUsage: "tailscale configure systray [options]",
+		ShortHelp:  "[ALPHA] Manage the systray client for Linux",
+		LongHelp:   "[ALPHA] The systray set of commands provides a way to configure the systray application on Linux.",
+		Exec:       configureSystray,
+		FlagSet: (func() *flag.FlagSet {
+			fs := newFlagSet("systray")
+			fs.StringVar(&systrayArgs.initSystem, "enable-startup", "",
+				"Install startup script for init system. Currently supported systems are [systemd].")
+			return fs
+		})(),
+	}
+}
+
+func configureSystray(_ context.Context, _ []string) error {
+	if systrayArgs.initSystem != "" {
+		if err := systray.InstallStartupScript(systrayArgs.initSystem); err != nil {
+			fmt.Printf("%s\n\n", err.Error())
+			return flag.ErrHelp
+		}
+		return nil
+	}
+	return flag.ErrHelp
+}

cmd/tailscale/cli/systray.go

@@ -7,41 +7,20 @@ package cli
 
 import (
 	"context"
-	"flag"
-	"fmt"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"tailscale.com/client/systray"
 )
 
-var systrayArgs struct {
-	initSystem     string
-	installStartup bool
-}
-
 var systrayCmd = &ffcli.Command{
 	Name:       "systray",
 	ShortUsage: "tailscale systray",
 	ShortHelp:  "Run a systray application to manage Tailscale",
-	LongHelp: `Run a systray application to manage Tailscale.
-To have the application run on startup, use the --enable-startup flag.`,
-	Exec: runSystray,
-	FlagSet: (func() *flag.FlagSet {
-		fs := newFlagSet("systray")
-		fs.StringVar(&systrayArgs.initSystem, "enable-startup", "",
-			"Install startup script for init system. Currently supported systems are [systemd].")
-		return fs
-	})(),
+	LongHelp:   "Run a systray application to manage Tailscale.",
+	Exec:       runSystray,
 }
 
 func runSystray(ctx context.Context, _ []string) error {
-	if systrayArgs.initSystem != "" {
-		if err := systray.InstallStartupScript(systrayArgs.initSystem); err != nil {
-			fmt.Printf("%s\n\n", err.Error())
-			return flag.ErrHelp
-		}
-		return nil
-	}
 	new(systray.Menu).Run(&localClient)
 	return nil
 }