cmd/cloner,util/codegen: refactor cloner internals to allow reuse

Also run go generate again for Copyright updates.

Signed-off-by: Maisem Ali <maisem@tailscale.com>

ipn/ipn_clone.go

@@ -0,0 +1,55 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
+
+package ipn
+
+import (
+	"inet.af/netaddr"
+	"tailscale.com/tailcfg"
+	"tailscale.com/types/persist"
+	"tailscale.com/types/preftype"
+)
+
+// Clone makes a deep copy of Prefs.
+// The result aliases no memory with the original.
+func (src *Prefs) Clone() *Prefs {
+	if src == nil {
+		return nil
+	}
+	dst := new(Prefs)
+	*dst = *src
+	dst.AdvertiseTags = append(src.AdvertiseTags[:0:0], src.AdvertiseTags...)
+	dst.AdvertiseRoutes = append(src.AdvertiseRoutes[:0:0], src.AdvertiseRoutes...)
+	if dst.Persist != nil {
+		dst.Persist = new(persist.Persist)
+		*dst.Persist = *src.Persist
+	}
+	return dst
+}
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _PrefsCloneNeedsRegeneration = Prefs(struct {
+	ControlURL             string
+	RouteAll               bool
+	AllowSingleHosts       bool
+	ExitNodeID             tailcfg.StableNodeID
+	ExitNodeIP             netaddr.IP
+	ExitNodeAllowLANAccess bool
+	CorpDNS                bool
+	RunSSH                 bool
+	WantRunning            bool
+	LoggedOut              bool
+	ShieldsUp              bool
+	AdvertiseTags          []string
+	Hostname               string
+	NotepadURLs            bool
+	ForceDaemon            bool
+	AdvertiseRoutes        []netaddr.IPPrefix
+	NoSNAT                 bool
+	NetfilterMode          preftype.NetfilterMode
+	OperatorUser           string
+	Persist                *persist.Persist
+}{})