Introduce InternalTektonResultType as a ResultType

In light of tektoncd#3087 the need for a ResultType that is not exposed
as a TaskRunResult or PipelineResourceResult arises.
In tektoncd#3087, a Step can emit a result indicating a Step timeout
has occurred.
This is a result that should not be exposed hence  the need for a
new ResultType called InternalTektonResultType.
This commit ensures results of this type are filtered out.

Introducing an InternalTektonResultType ensures a future proof
solution to internal results that should not be exposed.
Aside from the example in tektoncd#3087, a present candidate is the
result written out by a Step containing a "StartedAt" key.
Currently this result is filtered out with a specific function.
Marking it as an InternalTektonResultTypes now allows for
this result to automatically be filtered out.

pkg/apis/pipeline/v1beta1/task_types.go

@@ -26,6 +26,8 @@ const (
 	TaskRunResultType ResultType = "TaskRunResult"
 	// PipelineResourceResultType default pipeline result value
 	PipelineResourceResultType ResultType = "PipelineResourceResult"
+	// InternalTektonResultType default internal tekton result value
+	InternalTektonResultType ResultType = "InternalTektonResult"
 	// UnknownResultType default unknown result type value
 	UnknownResultType ResultType = ""
 )

pkg/entrypoint/entrypointer.go

@@ -102,8 +102,9 @@ func (e Entrypointer) Go() error {
 			// *but* we write postfile to make next steps bail too.
 			e.WritePostFile(e.PostFile, err)
 			output = append(output, v1beta1.PipelineResourceResult{
-				Key:   "StartedAt",
-				Value: time.Now().Format(timeFormat),
+				Key:        "StartedAt",
+				Value:      time.Now().Format(timeFormat),
+				ResultType: v1beta1.InternalTektonResultType,
 			})
 
 			return err
@@ -114,8 +115,9 @@ func (e Entrypointer) Go() error {
 		e.Args = append([]string{e.Entrypoint}, e.Args...)
 	}
 	output = append(output, v1beta1.PipelineResourceResult{
-		Key:   "StartedAt",
-		Value: time.Now().Format(timeFormat),
+		Key:        "StartedAt",
+		Value:      time.Now().Format(timeFormat),
+		ResultType: v1beta1.InternalTektonResultType,
 	})
 
 	err := e.Runner.Run(e.Args...)

pkg/pod/status.go

@@ -17,7 +17,6 @@ limitations under the License.
 package pod
 
 import (
-	"encoding/json"
 	"fmt"
 	"sort"
 	"strings"
@@ -97,27 +96,51 @@ func SidecarsReady(podStatus corev1.PodStatus) bool {
 }
 
 // MakeTaskRunStatus returns a TaskRunStatus based on the Pod's status.
-func MakeTaskRunStatus(logger *zap.SugaredLogger, tr v1beta1.TaskRun, pod *corev1.Pod, taskSpec v1beta1.TaskSpec) v1beta1.TaskRunStatus {
+func MakeTaskRunStatus(logger *zap.SugaredLogger, tr v1beta1.TaskRun, pod *corev1.Pod, taskSpec v1beta1.TaskSpec) (v1beta1.TaskRunStatus, error) {
 	trs := &tr.Status
 	if trs.GetCondition(apis.ConditionSucceeded) == nil || trs.GetCondition(apis.ConditionSucceeded).Status == corev1.ConditionUnknown {
 		// If the taskRunStatus doesn't exist yet, it's because we just started running
 		MarkStatusRunning(trs, v1beta1.TaskRunReasonRunning.String(), "Not all Steps in the Task have finished executing")
 	}
 
+	// Complete if we did not find a step that is not complete, or the pod is in a definitely complete phase
+	complete := areStepsComplete(pod) || pod.Status.Phase == corev1.PodSucceeded || pod.Status.Phase == corev1.PodFailed
+
+	if complete {
+		updateCompletedTaskRun(trs, pod)
+	} else {
+		updateIncompleteTaskRun(trs, pod)
+	}
+
 	trs.PodName = pod.Name
 	trs.Steps = []v1beta1.StepState{}
 	trs.Sidecars = []v1beta1.SidecarState{}
 
+	var err error
+
 	for _, s := range pod.Status.ContainerStatuses {
 		if IsContainerStep(s.Name) {
 			if s.State.Terminated != nil && len(s.State.Terminated.Message) != 0 {
-				message, time, err := removeStartInfoFromTerminationMessage(s)
+
+				var results []v1beta1.PipelineResourceResult
+				results, err = termination.ParseMessage(s.State.Terminated.Message)
 				if err != nil {
-					logger.Errorf("error setting the start time of step %q in taskrun %q: %w", s.Name, tr.Name, err)
-				}
-				if time != nil {
-					s.State.Terminated.StartedAt = *time
-					s.State.Terminated.Message = message
+					logger.Errorf("termination message could not be parsed as JSON: %v", err)
+				} else {
+					//Further processing if the termination message is JSON formatted
+					var time *metav1.Time
+					time, err = extractStartedAtTimeFromResults(results)
+					if err != nil {
+						logger.Errorf("error setting the start time of step %q in taskrun %q: %v", s.Name, tr.Name, err)
+					}
+					if time != nil {
+						s.State.Terminated.StartedAt = *time
+					}
+					if tr.IsSuccessful() {
+						taskResults, pipelineResourceResults := filterResultsAndResources(results)
+						trs.TaskRunResults = append(trs.TaskRunResults, taskResults...)
+						trs.ResourcesResult = append(trs.ResourcesResult, pipelineResourceResults...)
+					}
 				}
 			}
 			trs.Steps = append(trs.Steps, v1beta1.StepState{
@@ -135,51 +158,70 @@ func MakeTaskRunStatus(logger *zap.SugaredLogger, tr v1beta1.TaskRun, pod *corev
 			})
 		}
 	}
-
-	// Complete if we did not find a step that is not complete, or the pod is in a definitely complete phase
-	complete := areStepsComplete(pod) || pod.Status.Phase == corev1.PodSucceeded || pod.Status.Phase == corev1.PodFailed
-
-	if complete {
-		updateCompletedTaskRun(trs, pod)
-	} else {
-		updateIncompleteTaskRun(trs, pod)
-	}
+	trs.TaskRunResults = removeDuplicateResults(trs.TaskRunResults)
 
 	// Sort step states according to the order specified in the TaskRun spec's steps.
 	trs.Steps = sortTaskRunStepOrder(trs.Steps, taskSpec.Steps)
 
-	return *trs
+	return *trs, err
+}
+
+func filterResultsAndResources(results []v1beta1.PipelineResourceResult) ([]v1beta1.TaskRunResult, []v1beta1.PipelineResourceResult) {
+	var taskResults []v1beta1.TaskRunResult
+	var pipelineResourceResults []v1beta1.PipelineResourceResult
+	for _, r := range results {
+		switch r.ResultType {
+		case v1beta1.TaskRunResultType:
+			taskRunResult := v1beta1.TaskRunResult{
+				Name:  r.Key,
+				Value: r.Value,
+			}
+			taskResults = append(taskResults, taskRunResult)
+		case v1beta1.InternalTektonResultType:
+			// Internal messages are ignored because they're not used as external result
+			continue
+		case v1beta1.PipelineResourceResultType:
+			fallthrough
+		default:
+			pipelineResourceResults = append(pipelineResourceResults, r)
+		}
+	}
+
+	return taskResults, pipelineResourceResults
 }
 
-// removeStartInfoFromTerminationMessage searches for a result called "StartedAt" in the JSON-formatted
-// termination message of a step and returns the values to use for sets State.Terminated if it's
-// found. The "StartedAt" result is also removed from the list of results in the container status.
-func removeStartInfoFromTerminationMessage(s corev1.ContainerStatus) (string, *metav1.Time, error) {
-	r, err := termination.ParseMessage(s.State.Terminated.Message)
-	if err != nil {
-		return "", nil, fmt.Errorf("termination message could not be parsed as JSON: %w", err)
+func removeDuplicateResults(taskRunResult []v1beta1.TaskRunResult) []v1beta1.TaskRunResult {
+	if len(taskRunResult) == 0 {
+		return nil
+	}
+
+	uniq := make([]v1beta1.TaskRunResult, 0)
+	latest := make(map[string]v1beta1.TaskRunResult, 0)
+	for _, res := range taskRunResult {
+		if _, seen := latest[res.Name]; !seen {
+			uniq = append(uniq, res)
+		}
+		latest[res.Name] = res
+	}
+	for i, res := range uniq {
+		uniq[i] = latest[res.Name]
 	}
-	for index, result := range r {
+	return uniq
+}
+
+func extractStartedAtTimeFromResults(results []v1beta1.PipelineResourceResult) (*metav1.Time, error) {
+
+	for _, result := range results {
 		if result.Key == "StartedAt" {
 			t, err := time.Parse(timeFormat, result.Value)
 			if err != nil {
-				return "", nil, fmt.Errorf("could not parse time value %q in StartedAt field: %w", result.Value, err)
+				return nil, fmt.Errorf("could not parse time value %q in StartedAt field: %w", result.Value, err)
 			}
-			message := ""
 			startedAt := metav1.NewTime(t)
-			// remove the entry for the starting time
-			r = append(r[:index], r[index+1:]...)
-			if len(r) == 0 {
-				message = ""
-			} else if bytes, err := json.Marshal(r); err != nil {
-				return "", nil, fmt.Errorf("error marshalling remaining results back into termination message: %w", err)
-			} else {
-				message = string(bytes)
-			}
-			return message, &startedAt, nil
+			return &startedAt, nil
 		}
 	}
-	return "", nil, nil
+	return nil, nil
 }
 
 func updateCompletedTaskRun(trs *v1beta1.TaskRunStatus, pod *corev1.Pod) {