Fixed update verification

Previously version before update was not stored, so it was hard to verify
if update happened or not. This change stores the version and compares it with
updated version to report approiate logs.

updater/aws.go

@@ -19,6 +19,7 @@ const (
 type instance struct {
 	instanceID          string
 	containerInstanceID string
+	bottlerocketVersion string
 }
 
 type checkOutput struct {
@@ -112,6 +113,7 @@ func (u *updater) filterAvailableUpdates(bottlerocketInstances []instance) ([]in
 			continue
 		}
 		if output.UpdateState == "Available" {
+			inst.bottlerocketVersion = output.ActivePartition.Image.Version
 			candidates = append(candidates, inst)
 		}
 	}
@@ -265,14 +267,15 @@ func (u *updater) verifyUpdate(inst instance) error {
 	if err != nil {
 		return fmt.Errorf("failed to parse check command output %s, manual verification required: %w", string(updateResult), err)
 	}
-	if output.UpdateState == "Available" {
-		return fmt.Errorf(" instance did not update, manual update advised")
-	}
-	log.Printf("Instance %#q updated successfully", inst)
-	if output.ActivePartition.Image.Version != "" {
-		log.Printf("Instance %#q running Bottlerocket: %s", inst, output.ActivePartition.Image.Version)
+	updatedVersion := output.ActivePartition.Image.Version
+	if updatedVersion == inst.bottlerocketVersion {
+		log.Printf("Container instance %q did not update, its current "+
+			"version %s and updated version %s are same", inst.containerInstanceID, inst.bottlerocketVersion, updatedVersion)
+	} else if output.UpdateState == "Available" {
+		log.Printf("Update for container instance %q was successful, however another newer version %s was released recently."+
+			" Instance will be updated to newer version in next iteration.", inst.containerInstanceID, updatedVersion)
 	} else {
-		log.Printf("Unable to verify active version. Manual verification of %#q required.", inst)
+		log.Printf("Instance %#q successfully updated to version %s", inst, updatedVersion)
 	}
 	return nil
 }