refactor(k8s): podTracker.Start takes a ctx

runtime/kubernetes/build.go

@@ -194,7 +194,7 @@ func (c *client) AssembleBuild(ctx context.Context, b *pipeline.Build) error {
 	}
 
 	// Populate the PodTracker caches before creating the pipeline pod
-	c.PodTracker.Start(ctx.Done())
+	c.PodTracker.Start(ctx)
 
 	if ok := cache.WaitForCacheSync(ctx.Done(), c.PodTracker.PodSynced); !ok {
 		return fmt.Errorf("failed to wait for caches to sync")

runtime/kubernetes/container_test.go

@@ -398,19 +398,19 @@ func TestKubernetes_WaitContainer(t *testing.T) {
 
 	// run tests
 	for _, test := range tests {
-		// anonymous function to allow "defer close(stopCh)" on each iteration
+		// anonymous function to allow "defer done()" on each iteration
 		func() {
 			// set up the fake k8s clientset so that it returns the final/updated state
 			_engine, err := NewMock(test.updated)
 			if err != nil {
 				t.Errorf("unable to create runtime engine: %v", err)
 			}
 
-			stopCh := make(chan struct{})
-			defer close(stopCh)
+			ctx, done := context.WithCancel(context.Background())
+			defer done()
 
 			// enable the add/update/delete funcs for pod changes
-			_engine.PodTracker.Start(stopCh)
+			_engine.PodTracker.Start(ctx)
 
 			go func() {
 				// revert the cached pod to an "older" version

runtime/kubernetes/pod_tracker.go

@@ -5,6 +5,7 @@
 package kubernetes
 
 import (
+	"context"
 	"fmt"
 	"sync"
 	"time"
@@ -133,11 +134,11 @@ func (p podTracker) getTrackedPod(obj interface{}) *v1.Pod {
 
 // Start kicks off the API calls to start populating the cache.
 // There is no need to run this in a separate goroutine (ie go podTracker.Start(stopCh)).
-func (p podTracker) Start(stopCh <-chan struct{}) {
+func (p podTracker) Start(ctx context.Context) {
 	p.Logger.Tracef("starting PodTracker for pod %s", p.TrackedPod)
 
 	// Start method is non-blocking and runs all registered informers in a dedicated goroutine.
-	p.informerFactory.Start(stopCh)
+	p.informerFactory.Start(ctx.Done())
 }
 
 // newPodTracker initializes a podTracker with a given clientset for a given pod.