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.

Additionally this commit brings about refactoring (and sometimes
renaming) of functions deemed related to taskrun status updates
from pkg/reconciler/taskrun/taskrun.go to pkg/pod/status/status.go.
This is accompanied with moving test cases for unexported
functions in taskrun.go to test cases for exported functions
in status.go that now rely on these unexported functions.

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) {