clientupdate: abort if current version is newer than latest (#9733)

This is only relevant for unstable releases and local builds. When local
version is newer than upstream, abort release.

Also, re-add missing newlines in output that were missed in
https://github.com/tailscale/tailscale/pull/9694.

Updates #cleanup

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>

clientupdate/clientupdate.go

@@ -30,6 +30,7 @@ import (
 	"github.com/google/uuid"
 	"tailscale.com/clientupdate/distsign"
 	"tailscale.com/types/logger"
+	"tailscale.com/util/cmpver"
 	"tailscale.com/util/winutil"
 	"tailscale.com/version"
 	"tailscale.com/version/distro"
@@ -211,9 +212,13 @@ func Update(args Arguments) error {
 }
 
 func (up *Updater) confirm(ver string) bool {
-	if version.Short() == ver {
+	switch cmpver.Compare(version.Short(), ver) {
+	case 0:
 		up.Logf("already running %v; no update needed", ver)
 		return false
+	case 1:
+		up.Logf("installed version %v is newer than the latest available version %v; no update needed", version.Short(), ver)
+		return false
 	}
 	if up.Confirm != nil {
 		return up.Confirm(ver)

cmd/tailscale/cli/update.go

@@ -63,7 +63,7 @@ func runUpdate(ctx context.Context, args []string) error {
 	err := clientupdate.Update(clientupdate.Arguments{
 		Version:  ver,
 		AppStore: updateArgs.appStore,
-		Logf:     printf,
+		Logf:     func(f string, a ...any) { printf(f+"\n", a...) },
 		Stdout:   Stdout,
 		Stderr:   Stderr,
 		Confirm:  confirmUpdate,

cmd/tailscale/depaware.txt

@@ -158,7 +158,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         tailscale.com/types/views                                    from tailscale.com/tailcfg+
         tailscale.com/util/clientmetric                              from tailscale.com/net/netcheck+
         tailscale.com/util/cloudenv                                  from tailscale.com/net/dnscache+
-   W    tailscale.com/util/cmpver                                    from tailscale.com/net/tshttpproxy
+        tailscale.com/util/cmpver                                    from tailscale.com/net/tshttpproxy+
         tailscale.com/util/cmpx                                      from tailscale.com/cmd/tailscale/cli+
    L 💣 tailscale.com/util/dirwalk                                   from tailscale.com/metrics
         tailscale.com/util/dnsname                                   from tailscale.com/cmd/tailscale/cli+

cmd/tailscaled/depaware.txt

@@ -331,7 +331,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/types/views                                    from tailscale.com/ipn/ipnlocal+
         tailscale.com/util/clientmetric                              from tailscale.com/control/controlclient+
         tailscale.com/util/cloudenv                                  from tailscale.com/net/dns/resolver+
-  LW    tailscale.com/util/cmpver                                    from tailscale.com/net/dns+
+        tailscale.com/util/cmpver                                    from tailscale.com/net/dns+
         tailscale.com/util/cmpx                                      from tailscale.com/derp/derphttp+
      💣 tailscale.com/util/deephash                                  from tailscale.com/ipn/ipnlocal+
    L 💣 tailscale.com/util/dirwalk                                   from tailscale.com/metrics+