types/ptr: move all the ptrTo funcs to one new package's ptr.To

Change-Id: Ia0b820ffe7aa72897515f19bd415204b6fe743c7
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

cmd/derper/depaware.txt

@@ -69,6 +69,7 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         tailscale.com/types/opt                                      from tailscale.com/client/tailscale+
         tailscale.com/types/persist                                  from tailscale.com/ipn
         tailscale.com/types/preftype                                 from tailscale.com/ipn
+        tailscale.com/types/ptr                                      from tailscale.com/hostinfo
         tailscale.com/types/structs                                  from tailscale.com/ipn+
         tailscale.com/types/tkatype                                  from tailscale.com/types/key+
         tailscale.com/types/views                                    from tailscale.com/ipn/ipnstate+

cmd/tailscale/cli/set_test.go

@@ -11,10 +11,9 @@
 
 	"tailscale.com/ipn"
 	"tailscale.com/net/tsaddr"
+	"tailscale.com/types/ptr"
 )
 
-func ptrTo[T any](v T) *T { return &v }
-
 func TestCalcAdvertiseRoutesForSet(t *testing.T) {
 	pfx := netip.MustParsePrefix
 	tests := []struct {
@@ -29,80 +28,80 @@ func TestCalcAdvertiseRoutesForSet(t *testing.T) {
 		},
 		{
 			name:    "advertise-exit",
-			setExit: ptrTo(true),
+			setExit: ptr.To(true),
 			want:    tsaddr.ExitRoutes(),
 		},
 		{
 			name:    "advertise-exit/already-routes",
 			was:     []netip.Prefix{pfx("34.0.0.0/16")},
-			setExit: ptrTo(true),
+			setExit: ptr.To(true),
 			want:    []netip.Prefix{pfx("34.0.0.0/16"), tsaddr.AllIPv4(), tsaddr.AllIPv6()},
 		},
 		{
 			name:    "advertise-exit/already-exit",
 			was:     tsaddr.ExitRoutes(),
-			setExit: ptrTo(true),
+			setExit: ptr.To(true),
 			want:    tsaddr.ExitRoutes(),
 		},
 		{
 			name:    "stop-advertise-exit",
 			was:     tsaddr.ExitRoutes(),
-			setExit: ptrTo(false),
+			setExit: ptr.To(false),
 			want:    nil,
 		},
 		{
 			name:    "stop-advertise-exit/with-routes",
 			was:     []netip.Prefix{pfx("34.0.0.0/16"), tsaddr.AllIPv4(), tsaddr.AllIPv6()},
-			setExit: ptrTo(false),
+			setExit: ptr.To(false),
 			want:    []netip.Prefix{pfx("34.0.0.0/16")},
 		},
 		{
 			name:      "advertise-routes",
-			setRoutes: ptrTo("10.0.0.0/24,192.168.0.0/16"),
+			setRoutes: ptr.To("10.0.0.0/24,192.168.0.0/16"),
 			want:      []netip.Prefix{pfx("10.0.0.0/24"), pfx("192.168.0.0/16")},
 		},
 		{
 			name:      "advertise-routes/already-exit",
 			was:       tsaddr.ExitRoutes(),
-			setRoutes: ptrTo("10.0.0.0/24,192.168.0.0/16"),
+			setRoutes: ptr.To("10.0.0.0/24,192.168.0.0/16"),
 			want:      []netip.Prefix{pfx("10.0.0.0/24"), pfx("192.168.0.0/16"), tsaddr.AllIPv4(), tsaddr.AllIPv6()},
 		},
 		{
 			name:      "advertise-routes/already-diff-routes",
 			was:       []netip.Prefix{pfx("34.0.0.0/16")},
-			setRoutes: ptrTo("10.0.0.0/24,192.168.0.0/16"),
+			setRoutes: ptr.To("10.0.0.0/24,192.168.0.0/16"),
 			want:      []netip.Prefix{pfx("10.0.0.0/24"), pfx("192.168.0.0/16")},
 		},
 		{
 			name:      "stop-advertise-routes",
 			was:       []netip.Prefix{pfx("34.0.0.0/16")},
-			setRoutes: ptrTo(""),
+			setRoutes: ptr.To(""),
 			want:      nil,
 		},
 		{
 			name:      "stop-advertise-routes/already-exit",
 			was:       []netip.Prefix{pfx("34.0.0.0/16"), tsaddr.AllIPv4(), tsaddr.AllIPv6()},
-			setRoutes: ptrTo(""),
+			setRoutes: ptr.To(""),
 			want:      tsaddr.ExitRoutes(),
 		},
 		{
 			name:      "advertise-routes-and-exit",
-			setExit:   ptrTo(true),
+			setExit:   ptr.To(true),
-			setRoutes: ptrTo("10.0.0.0/24,192.168.0.0/16"),
+			setRoutes: ptr.To("10.0.0.0/24,192.168.0.0/16"),
 			want:      []netip.Prefix{pfx("10.0.0.0/24"), pfx("192.168.0.0/16"), tsaddr.AllIPv4(), tsaddr.AllIPv6()},
 		},
 		{
 			name:      "advertise-routes-and-exit/already-exit",
 			was:       tsaddr.ExitRoutes(),
-			setExit:   ptrTo(true),
+			setExit:   ptr.To(true),
-			setRoutes: ptrTo("10.0.0.0/24,192.168.0.0/16"),
+			setRoutes: ptr.To("10.0.0.0/24,192.168.0.0/16"),
 			want:      []netip.Prefix{pfx("10.0.0.0/24"), pfx("192.168.0.0/16"), tsaddr.AllIPv4(), tsaddr.AllIPv6()},
 		},
 		{
 			name:      "advertise-routes-and-exit/already-routes",
 			was:       []netip.Prefix{pfx("10.0.0.0/24"), pfx("192.168.0.0/16")},
-			setExit:   ptrTo(true),
+			setExit:   ptr.To(true),
-			setRoutes: ptrTo("10.0.0.0/24,192.168.0.0/16"),
+			setRoutes: ptr.To("10.0.0.0/24,192.168.0.0/16"),
 			want:      []netip.Prefix{pfx("10.0.0.0/24"), pfx("192.168.0.0/16"), tsaddr.AllIPv4(), tsaddr.AllIPv6()},
 		},
 	}

cmd/tailscale/depaware.txt

@@ -98,6 +98,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         tailscale.com/types/opt                                      from tailscale.com/net/netcheck+
         tailscale.com/types/persist                                  from tailscale.com/ipn
         tailscale.com/types/preftype                                 from tailscale.com/cmd/tailscale/cli+
+        tailscale.com/types/ptr                                      from tailscale.com/hostinfo
         tailscale.com/types/structs                                  from tailscale.com/ipn+
         tailscale.com/types/tkatype                                  from tailscale.com/types/key+
         tailscale.com/types/views                                    from tailscale.com/tailcfg+

cmd/tailscaled/depaware.txt

@@ -277,6 +277,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/types/opt                                      from tailscale.com/control/controlclient+
         tailscale.com/types/persist                                  from tailscale.com/control/controlclient+
         tailscale.com/types/preftype                                 from tailscale.com/ipn+
+        tailscale.com/types/ptr                                      from tailscale.com/hostinfo+
         tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
         tailscale.com/types/tkatype                                  from tailscale.com/tka+
         tailscale.com/types/views                                    from tailscale.com/ipn/ipnlocal+

control/controlclient/map_test.go

@@ -17,6 +17,7 @@
 	"tailscale.com/types/key"
 	"tailscale.com/types/netmap"
 	"tailscale.com/types/opt"
+	"tailscale.com/types/ptr"
 	"tailscale.com/util/must"
 )
 
@@ -201,7 +202,7 @@ func TestUndeltaPeers(t *testing.T) {
 			mapRes: &tailcfg.MapResponse{
 				PeersChangedPatch: []*tailcfg.PeerChange{{
 					NodeID: 1,
-					Key:    ptrTo(key.NodePublicFromRaw32(mem.B(append(make([]byte, 31), 'A')))),
+					Key:    ptr.To(key.NodePublicFromRaw32(mem.B(append(make([]byte, 31), 'A')))),
 				}},
 			}, want: peers(&tailcfg.Node{
 				ID:   1,
@@ -229,7 +230,7 @@ func TestUndeltaPeers(t *testing.T) {
 			mapRes: &tailcfg.MapResponse{
 				PeersChangedPatch: []*tailcfg.PeerChange{{
 					NodeID:   1,
-					DiscoKey: ptrTo(key.DiscoPublicFromRaw32(mem.B(append(make([]byte, 31), 'A')))),
+					DiscoKey: ptr.To(key.DiscoPublicFromRaw32(mem.B(append(make([]byte, 31), 'A')))),
 				}},
 			}, want: peers(&tailcfg.Node{
 				ID:       1,
@@ -243,12 +244,12 @@ func TestUndeltaPeers(t *testing.T) {
 			mapRes: &tailcfg.MapResponse{
 				PeersChangedPatch: []*tailcfg.PeerChange{{
 					NodeID: 1,
-					Online: ptrTo(true),
+					Online: ptr.To(true),
 				}},
 			}, want: peers(&tailcfg.Node{
 				ID:     1,
 				Name:   "foo",
-				Online: ptrTo(true),
+				Online: ptr.To(true),
 			}),
 		},
 		{
@@ -257,12 +258,12 @@ func TestUndeltaPeers(t *testing.T) {
 			mapRes: &tailcfg.MapResponse{
 				PeersChangedPatch: []*tailcfg.PeerChange{{
 					NodeID:   1,
-					LastSeen: ptrTo(time.Unix(123, 0).UTC()),
+					LastSeen: ptr.To(time.Unix(123, 0).UTC()),
 				}},
 			}, want: peers(&tailcfg.Node{
 				ID:       1,
 				Name:     "foo",
-				LastSeen: ptrTo(time.Unix(123, 0).UTC()),
+				LastSeen: ptr.To(time.Unix(123, 0).UTC()),
 			}),
 		},
 		{
@@ -271,7 +272,7 @@ func TestUndeltaPeers(t *testing.T) {
 			mapRes: &tailcfg.MapResponse{
 				PeersChangedPatch: []*tailcfg.PeerChange{{
 					NodeID:    1,
-					KeyExpiry: ptrTo(time.Unix(123, 0).UTC()),
+					KeyExpiry: ptr.To(time.Unix(123, 0).UTC()),
 				}},
 			}, want: peers(&tailcfg.Node{
 				ID:        1,
@@ -285,7 +286,7 @@ func TestUndeltaPeers(t *testing.T) {
 			mapRes: &tailcfg.MapResponse{
 				PeersChangedPatch: []*tailcfg.PeerChange{{
 					NodeID:       1,
-					Capabilities: ptrTo([]string{"foo"}),
+					Capabilities: ptr.To([]string{"foo"}),
 				}},
 			}, want: peers(&tailcfg.Node{
 				ID:           1,
@@ -307,10 +308,6 @@ func TestUndeltaPeers(t *testing.T) {
 	}
 }
 
-func ptrTo[T any](v T) *T {
-	return &v
-}
-
 func formatNodes(nodes []*tailcfg.Node) string {
 	var sb strings.Builder
 	for i, n := range nodes {

hostinfo/hostinfo.go

@@ -20,6 +20,7 @@
 	"tailscale.com/envknob"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/opt"
+	"tailscale.com/types/ptr"
 	"tailscale.com/util/cloudenv"
 	"tailscale.com/util/dnsname"
 	"tailscale.com/util/lineread"
@@ -70,11 +71,9 @@ func condCall[T any](fn func() T) T {
 }
 
 var (
-	lazyInContainer = &lazyAtomicValue[opt.Bool]{f: ptrTo(inContainer)}
+	lazyInContainer = &lazyAtomicValue[opt.Bool]{f: ptr.To(inContainer)}
 )
 
-func ptrTo[T any](v T) *T { return &v }
-
 type lazyAtomicValue[T any] struct {
 	// f is a pointer to a fill function. If it's nil or points
 	// to nil, then Get returns the zero value for T.

hostinfo/hostinfo_freebsd.go

@@ -12,6 +12,7 @@
 	"os/exec"
 
 	"golang.org/x/sys/unix"
+	"tailscale.com/types/ptr"
 	"tailscale.com/version/distro"
 )
 
@@ -22,8 +23,8 @@ func init() {
 }
 
 var (
-	lazyVersionMeta = &lazyAtomicValue[versionMeta]{f: ptrTo(freebsdVersionMeta)}
+	lazyVersionMeta = &lazyAtomicValue[versionMeta]{f: ptr.To(freebsdVersionMeta)}
-	lazyOSVersion   = &lazyAtomicValue[string]{f: ptrTo(osVersionFreeBSD)}
+	lazyOSVersion   = &lazyAtomicValue[string]{f: ptr.To(osVersionFreeBSD)}
 )
 
 func distroNameFreeBSD() string {

hostinfo/hostinfo_linux.go

@@ -12,6 +12,7 @@
 	"strings"
 
 	"golang.org/x/sys/unix"
+	"tailscale.com/types/ptr"
 	"tailscale.com/util/lineread"
 	"tailscale.com/util/strs"
 	"tailscale.com/version/distro"
@@ -29,8 +30,8 @@ func init() {
 }
 
 var (
-	lazyVersionMeta = &lazyAtomicValue[versionMeta]{f: ptrTo(linuxVersionMeta)}
+	lazyVersionMeta = &lazyAtomicValue[versionMeta]{f: ptr.To(linuxVersionMeta)}
-	lazyOSVersion   = &lazyAtomicValue[string]{f: ptrTo(osVersionLinux)}
+	lazyOSVersion   = &lazyAtomicValue[string]{f: ptr.To(osVersionLinux)}
 )
 
 type versionMeta struct {

hostinfo/hostinfo_windows.go

@@ -11,6 +11,7 @@
 
 	"golang.org/x/sys/windows"
 	"golang.org/x/sys/windows/registry"
+	"tailscale.com/types/ptr"
 	"tailscale.com/util/winutil"
 )
 
@@ -20,8 +21,8 @@ func init() {
 }
 
 var (
-	lazyOSVersion   = &lazyAtomicValue[string]{f: ptrTo(osVersionWindows)}
+	lazyOSVersion   = &lazyAtomicValue[string]{f: ptr.To(osVersionWindows)}
-	lazyPackageType = &lazyAtomicValue[string]{f: ptrTo(packageTypeWindows)}
+	lazyPackageType = &lazyAtomicValue[string]{f: ptr.To(packageTypeWindows)}
 )
 
 func osVersionWindows() string {

types/ptr/ptr.go

@@ -0,0 +1,11 @@
+// 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.
+
+// Package ptr contains the ptr.To function.
+package ptr
+
+// To returns a pointer to a shallow copy of v.
+func To[T any](v T) *T {
+	return &v
+}

util/deephash/deephash_test.go

@@ -27,6 +27,7 @@
 	"tailscale.com/types/dnstype"
 	"tailscale.com/types/ipproto"
 	"tailscale.com/types/key"
+	"tailscale.com/types/ptr"
 	"tailscale.com/util/deephash/testtype"
 	"tailscale.com/util/dnsname"
 	"tailscale.com/version"
@@ -485,7 +486,7 @@ func TestGetTypeHasher(t *testing.T) {
 		},
 		{
 			name: "time_ptr", // addressable, as opposed to "time" test above
-			val:  ptrTo(time.Unix(1234, 5678).In(time.UTC)),
+			val:  ptr.To(time.Unix(1234, 5678).In(time.UTC)),
 			out:  u8(1) + u64(1234) + u32(5678) + u32(0),
 		},
 		{
@@ -515,7 +516,7 @@ func TestGetTypeHasher(t *testing.T) {
 		},
 		{
 			name: "array_ptr_memhash",
-			val:  ptrTo([4]byte{1, 2, 3, 4}),
+			val:  ptr.To([4]byte{1, 2, 3, 4}),
 			out:  "\x01\x01\x02\x03\x04",
 		},
 		{
@@ -742,8 +743,6 @@ func BenchmarkHash(b *testing.B) {
 	}
 }
 
-func ptrTo[T any](v T) *T { return &v }
-
 // filterRules is a packet filter that has both everything populated (in its
 // first element) and also a few entries that are the typical shape for regular
 // packet filters as sent to clients.
@@ -753,7 +752,7 @@ func ptrTo[T any](v T) *T { return &v }
 		SrcBits: []int{1, 2, 3},
 		DstPorts: []tailcfg.NetPortRange{{
 			IP:    "1.2.3.4/32",
-			Bits:  ptrTo(32),
+			Bits:  ptr.To(32),
 			Ports: tailcfg.PortRange{First: 1, Last: 2},
 		}},
 		IPProto: []int{1, 2, 3, 4},
@@ -936,7 +935,7 @@ type mapResponseOut struct {
 		SSHPolicy: &sshPolicyOut{
 			Rules: []tailcfg.SSHRuleView{
 				(&tailcfg.SSHRule{
-					RuleExpires: ptrTo(time.Unix(123, 0)),
+					RuleExpires: ptr.To(time.Unix(123, 0)),
 				}).View(),
 			},
 		},