rootless: disable pod stats

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

cmd/podman/main.go

@@ -71,6 +71,7 @@ var cmdsNotRequiringRootless = map[*cobra.Command]bool{
 	_killCommand:     true,
 	_pauseCommand:    true,
 	_podKillCommand:  true,
+	_podStatsCommand: true,
 	_restartCommand:  true,
 	_runCommand:      true,
 	_unpauseCommand:  true,

cmd/podman/pod_stats.go

@@ -53,6 +53,11 @@ func init() {
 }
 
 func podStatsCmd(c *cliconfig.PodStatsValues) error {
+
+	if os.Geteuid() != 0 {
+		return errors.New("stats is not supported in rootless mode")
+	}
+
 	format := c.Format
 	all := c.All
 	latest := c.Latest