Implement 0 as no timeout for TaskRun

If the timeout is set to 0, there is no timeout for the TaskRun.
If the timeout is empty, the default timeout 60 mins will be applied.
If the timeout is set to -1, the taskrun is created in pipelinerun after
it timed out.

docs/taskruns.md

@@ -48,8 +48,10 @@ following fields:
   - [`inputs`] - Specifies [input parameters](#input-parameters) and
     [input resources](#providing-resources)
   - [`outputs`] - Specifies [output resources](#providing-resources)
-  - `timeout` - Specifies timeout after which the `TaskRun` will fail. Defaults
-    to 60 minutes.
+  - `timeout` - Specifies timeout after which the `TaskRun` will fail. If the value of
+    `timeout` is empty, the default timeout will be applied. If the value is set to 0,
+    there is no timeout. You can also follow the instruction [here](#Configuring-default-timeout)
+    to configure the default timeout.
   - [`nodeSelector`] - a selector which must be true for the pod to fit on a
     node. The selector which must match a node's labels for the pod to be
     scheduled on that node. More info:
@@ -145,6 +147,13 @@ spec:
               value: https://github.com/pivotal-nader-ziada/gohelloworld
 ```
 
+### Configuring Default Timeout
+
+You can configure the default timeout by changing the value of `default-timeout-minutes`
+in [`config/config-defaults.yaml`](./../config/config-defaults.yaml). The default timeout
+is 60 minutes, if `default-timeout-minutes` is not available. There is no timeout by
+default, if `default-timeout-minutes` is set to 0.
+
 ### Service Account
 
 Specifies the `name` of a `ServiceAccount` resource object. Use the

pkg/reconciler/timeout_handler_test.go

@@ -291,15 +291,44 @@ func TestGetTimeout(t *testing.T) {
 			inputDuration:    &metav1.Duration{Duration: 2 * time.Second},
 			expectedDuration: 2 * time.Second,
 		},
+		{
+			description:      "returns 0 if the timeout duration is set to 0 second/minute/hour",
+			inputDuration:    &metav1.Duration{Duration: 0 * time.Second},
+			expectedDuration: 0 * time.Minute,
+		},
+		{
+			description:      "returns -1 if it has timed out",
+			inputDuration:    &metav1.Duration{Duration: -1 * time.Second},
+			expectedDuration: -1 * time.Second,
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+			receivedDuration := GetTimeout(tc.inputDuration, 60)
+			if receivedDuration != tc.expectedDuration {
+				t.Errorf("expected %q received %q", tc.expectedDuration.String(), receivedDuration.String())
+			}
+		})
+	}
+	verifyTimeout(0, t)
+	verifyTimeout(60, t)
+}
+
+func verifyTimeout(defaultTimeout int, t *testing.T) {
+	testCases := []struct {
+		description      string
+		inputDuration    *metav1.Duration
+		expectedDuration time.Duration
+	}{
 		{
 			description:      "returns an end time using the default timeout if a TaskRun's timeout is nil",
 			inputDuration:    nil,
-			expectedDuration: 60 * time.Minute,
+			expectedDuration: time.Duration(defaultTimeout) * time.Minute,
 		},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.description, func(t *testing.T) {
-			receivedDuration := GetTimeout(tc.inputDuration, 60)
+			receivedDuration := GetTimeout(tc.inputDuration, defaultTimeout)
 			if receivedDuration != tc.expectedDuration {
 				t.Errorf("expected %q received %q", tc.expectedDuration.String(), receivedDuration.String())
 			}

pkg/reconciler/v1alpha1/pipelinerun/pipelinerun.go

@@ -445,10 +445,10 @@ func (c *Reconciler) createTaskRun(logger *zap.SugaredLogger, rprt *resources.Re
 		pTimeoutTime := pr.Status.StartTime.Add(pr.Spec.Timeout.Duration)
 		if time.Now().After(pTimeoutTime) {
 			// Just in case something goes awry and we're creating the TaskRun after it should have already timed out,
-			// set a timeout of 0.
+			// set a timeout of -1.
 			taskRunTimeout = &metav1.Duration{Duration: time.Until(pTimeoutTime)}
 			if taskRunTimeout.Duration < 0 {
-				taskRunTimeout = &metav1.Duration{Duration: 0 * time.Second}
+				taskRunTimeout = &metav1.Duration{Duration: -1 * time.Second}
 			}
 		} else {
 			taskRunTimeout = pr.Spec.Timeout

pkg/reconciler/v1alpha1/taskrun/taskrun.go

@@ -542,6 +542,10 @@ func (c *Reconciler) checkTimeout(tr *v1alpha1.TaskRun, ts *v1alpha1.TaskSpec, d
 
 	cfg := c.store.Load()
 	timeout := reconciler.GetTimeout(tr.Spec.Timeout, cfg.ConfigDefault.DefaultTimeoutMinutes)
+	// If timeout is set to 0 or defaulted to 0, there is no timeout.
+	if timeout == 0 * time.Minute {
+		return false, nil
+	}
 	runtime := time.Since(tr.Status.StartTime.Time)
 	c.Logger.Infof("Checking timeout for TaskRun %q (startTime %s, timeout %s, runtime %s)", tr.Name, tr.Status.StartTime, timeout, runtime)