tetragon: Plug in the config object

Signed-off-by: Jiri Olsa <jolsa@kernel.org>

cmd/tetragon/main.go

@@ -28,6 +28,7 @@ import (
 	"github.com/cilium/tetragon/pkg/bugtool"
 	"github.com/cilium/tetragon/pkg/checkprocfs"
 	"github.com/cilium/tetragon/pkg/cilium"
+	"github.com/cilium/tetragon/pkg/config"
 	"github.com/cilium/tetragon/pkg/defaults"
 	"github.com/cilium/tetragon/pkg/encoder"
 	"github.com/cilium/tetragon/pkg/exporter"
@@ -436,6 +437,13 @@ func tetragonExecute() error {
 		base.Unload()
 	}()
 
+	onReconfig := func(data *config.Data) {
+		option.Config.DisableKprobeMulti = data.DisableKprobeMulti
+	}
+
+	cfg := config.NewConfig(option.Config.ConfigFile, 5*time.Second, onReconfig)
+	defer cfg.Stop()
+
 	// now that the base sensor was loaded, we can start the sensor manager
 	close(sensorMgWait)
 	sensorMgWait = nil

pkg/option/config.go

@@ -86,6 +86,8 @@ type config struct {
 	EnableTracingPolicyCRD bool
 
 	ExposeKernelAddresses bool
+
+	ConfigFile string
 }
 
 var (

pkg/option/flags.go

@@ -92,6 +92,8 @@ const (
 	KeyExposeKernelAddresses = "expose-kernel-addresses"
 
 	KeyGenerateDocs = "generate-docs"
+
+	KeyConfigFile = "config-file"
 )
 
 func ReadAndSetFlags() error {
@@ -172,6 +174,7 @@ func ReadAndSetFlags() error {
 
 	Config.ExposeKernelAddresses = viper.GetBool(KeyExposeKernelAddresses)
 
+	Config.ConfigFile = viper.GetString(KeyConfigFile)
 	return nil
 }
 
@@ -278,4 +281,6 @@ func AddFlags(flags *pflag.FlagSet) {
 	flags.Bool(KeyExposeKernelAddresses, false, "Expose real kernel addresses in events stack traces")
 
 	flags.Bool(KeyGenerateDocs, false, "Generate documentation in YAML format to stdout")
+
+	flags.String(KeyConfigFile, "", "configuration file")
 }