tetragon-oci-hook: container name from annotations

We cannot use arg.Watcher.FindContainer() because it uses k8s API where
the container is still not available.
Therefore, we extract the name of the container from request annotations
based on the container runtime.

Fixes: cilium#1879

Signed-off-by: Oleh Neichev <[email protected]>

pkg/policyfilter/rthooks/rthooks.go

@@ -5,6 +5,7 @@ package rthooks
 
 import (
 	"context"
+	"fmt"
 	"path/filepath"
 	"time"
 
@@ -92,15 +93,24 @@ func createContainerHook(_ context.Context, arg *rthooks.CreateContainerArg) err
 		return err
 	}
 
-	var containerFound bool
-	var container *corev1.ContainerStatus
 	namespace := pod.ObjectMeta.Namespace
-	pod, container, containerFound = arg.Watcher.FindContainer(containerID)
-	if !containerFound {
-		log.WithError(err).Warnf("failed to find container information %s, aborting hook.", containerID)
+
+	// we cannot use arg.Watcher.FindContainer() because it uses k8s API
+	// where the container is still not available
+	containerName := ""
+	// containerd
+	if val, ok := arg.Req.Annotations["io.kubernetes.cri.container-name"]; ok {
+		containerName = val
+	} else if val, ok := arg.Req.Annotations["io.kubernetes.container.name"]; ok {
+		// crio
+		containerName = val
 	}
 
-	containerName := container.Name
+	if containerName == "" {
+		err := fmt.Errorf("failed to find container information %s, aborting hook", containerID)
+		log.Warn(err)
+		return err
+	}
 
 	log.WithFields(logrus.Fields{
 		"pod-id":         podID,