fix: data injection to return errors (#2720)

Signed-off-by: Philip Laine <philip.laine@gmail.com>
Signed-off-by: Austin Abro <AustinAbro321@gmail.com>

src/pkg/cluster/data.go

@@ -13,7 +13,6 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"sync"
 	"time"
 
 	corev1 "k8s.io/api/core/v1"
@@ -32,12 +31,10 @@ import (
 
 // HandleDataInjection waits for the target pod(s) to come up and inject the data into them
 // todo:  this currently requires kubectl but we should have enough k8s work to make this native now.
-func (c *Cluster) HandleDataInjection(ctx context.Context, wg *sync.WaitGroup, data types.ZarfDataInjection, componentPath *layout.ComponentPaths, dataIdx int) {
-	defer wg.Done()
+func (c *Cluster) HandleDataInjection(ctx context.Context, data types.ZarfDataInjection, componentPath *layout.ComponentPaths, dataIdx int) error {
 	injectionCompletionMarker := filepath.Join(componentPath.DataInjections, config.GetDataInjectionMarker())
 	if err := os.WriteFile(injectionCompletionMarker, []byte("🦄"), helpers.ReadWriteUser); err != nil {
-		message.WarnErrf(err, "Unable to create the data injection completion marker")
-		return
+		return fmt.Errorf("unable to create the data injection completion marker: %w", err)
 	}
 
 	tarCompressFlag := ""
@@ -59,103 +56,110 @@ func (c *Cluster) HandleDataInjection(ctx context.Context, wg *sync.WaitGroup, d
 	shell, shellArgs := exec.GetOSShell(exec.Shell{Windows: "cmd"})
 
 	if _, _, err := exec.Cmd(shell, append(shellArgs, "tar --version")...); err != nil {
-		message.WarnErr(err, "Unable to execute tar on this system.  Please ensure it is installed and on your $PATH.")
-		return
+		return fmt.Errorf("unable to execute tar, ensure it is installed in the $PATH: %w", err)
 	}
 
-iterator:
-	// The eternal loop because some data injections can take a very long time
 	for {
-		message.Debugf("Attempting to inject data into %s", data.Target)
-		source := filepath.Join(componentPath.DataInjections, filepath.Base(data.Target.Path))
-		if helpers.InvalidPath(source) {
-			// The path is likely invalid because of how we compose OCI components, add an index suffix to the filename
-			source = filepath.Join(componentPath.DataInjections, strconv.Itoa(dataIdx), filepath.Base(data.Target.Path))
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			message.Debugf("Attempting to inject data into %s", data.Target)
+			source := filepath.Join(componentPath.DataInjections, filepath.Base(data.Target.Path))
 			if helpers.InvalidPath(source) {
-				message.Warnf("Unable to find the data injection source path %s", source)
-				return
+				// The path is likely invalid because of how we compose OCI components, add an index suffix to the filename
+				source = filepath.Join(componentPath.DataInjections, strconv.Itoa(dataIdx), filepath.Base(data.Target.Path))
+				if helpers.InvalidPath(source) {
+					return fmt.Errorf("could not find the data injection source path %s", source)
+				}
 			}
-		}
 
-		target := podLookup{
-			Namespace: data.Target.Namespace,
-			Selector:  data.Target.Selector,
-			Container: data.Target.Container,
-		}
-
-		// Wait until the pod we are injecting data into becomes available
-		pods := waitForPodsAndContainers(ctx, c.Clientset, target, podFilterByInitContainer)
-		if len(pods) < 1 {
-			continue
-		}
+			target := podLookup{
+				Namespace: data.Target.Namespace,
+				Selector:  data.Target.Selector,
+				Container: data.Target.Container,
+			}
 
-		// Inject into all the pods
-		for _, pod := range pods {
-			// Try to use the embedded kubectl if we can
-			zarfCommand, err := utils.GetFinalExecutableCommand()
-			kubectlBinPath := "kubectl"
+			// Wait until the pod we are injecting data into becomes available
+			pods, err := waitForPodsAndContainers(ctx, c.Clientset, target, podFilterByInitContainer)
 			if err != nil {
-				message.Warnf("Unable to get the zarf executable path, falling back to host kubectl: %s", err)
-			} else {
-				kubectlBinPath = fmt.Sprintf("%s tools kubectl", zarfCommand)
+				return err
+			}
+			if len(pods) < 1 {
+				continue
 			}
-			kubectlCmd := fmt.Sprintf("%s exec -i -n %s %s -c %s ", kubectlBinPath, data.Target.Namespace, pod.Name, data.Target.Container)
 
-			// Note that each command flag is separated to provide the widest cross-platform tar support
-			tarCmd := fmt.Sprintf("tar -c %s -f -", tarCompressFlag)
-			untarCmd := fmt.Sprintf("tar -x %s -v -f - -C %s", tarCompressFlag, data.Target.Path)
+			// Inject into all the pods
+			for _, pod := range pods {
+				// Try to use the embedded kubectl if we can
+				zarfCommand, err := utils.GetFinalExecutableCommand()
+				kubectlBinPath := "kubectl"
+				if err != nil {
+					message.Warnf("Unable to get the zarf executable path, falling back to host kubectl: %s", err)
+				} else {
+					kubectlBinPath = fmt.Sprintf("%s tools kubectl", zarfCommand)
+				}
+				kubectlCmd := fmt.Sprintf("%s exec -i -n %s %s -c %s ", kubectlBinPath, data.Target.Namespace, pod.Name, data.Target.Container)
 
-			// Must create the target directory before trying to change to it for untar
-			mkdirCmd := fmt.Sprintf("%s -- mkdir -p %s", kubectlCmd, data.Target.Path)
-			if err := exec.CmdWithPrint(shell, append(shellArgs, mkdirCmd)...); err != nil {
-				message.Warnf("Unable to create the data injection target directory %s in pod %s", data.Target.Path, pod.Name)
-				continue iterator
-			}
+				// Note that each command flag is separated to provide the widest cross-platform tar support
+				tarCmd := fmt.Sprintf("tar -c %s -f -", tarCompressFlag)
+				untarCmd := fmt.Sprintf("tar -x %s -v -f - -C %s", tarCompressFlag, data.Target.Path)
 
-			cpPodCmd := fmt.Sprintf("%s -C %s . | %s -- %s",
-				tarCmd,
-				source,
-				kubectlCmd,
-				untarCmd,
-			)
-
-			// Do the actual data injection
-			if err := exec.CmdWithPrint(shell, append(shellArgs, cpPodCmd)...); err != nil {
-				message.Warnf("Error copying data into the pod %#v: %#v\n", pod.Name, err)
-				continue iterator
-			}
+				// Must create the target directory before trying to change to it for untar
+				mkdirCmd := fmt.Sprintf("%s -- mkdir -p %s", kubectlCmd, data.Target.Path)
+				if err := exec.CmdWithPrint(shell, append(shellArgs, mkdirCmd)...); err != nil {
+					return fmt.Errorf("unable to create the data injection target directory %s in pod %s: %w", data.Target.Path, pod.Name, err)
+				}
+
+				cpPodCmd := fmt.Sprintf("%s -C %s . | %s -- %s",
+					tarCmd,
+					source,
+					kubectlCmd,
+					untarCmd,
+				)
 
-			// Leave a marker in the target container for pods to track the sync action
-			cpPodCmd = fmt.Sprintf("%s -C %s %s | %s -- %s",
-				tarCmd,
-				componentPath.DataInjections,
-				config.GetDataInjectionMarker(),
-				kubectlCmd,
-				untarCmd,
-			)
-
-			if err := exec.CmdWithPrint(shell, append(shellArgs, cpPodCmd)...); err != nil {
-				message.Warnf("Error saving the zarf sync completion file after injection into pod %#v\n", pod.Name)
-				continue iterator
+				// Do the actual data injection
+				if err := exec.CmdWithPrint(shell, append(shellArgs, cpPodCmd)...); err != nil {
+					return fmt.Errorf("could not copy data into the pod %s: %w", pod.Name, err)
+				}
+
+				// Leave a marker in the target container for pods to track the sync action
+				cpPodCmd = fmt.Sprintf("%s -C %s %s | %s -- %s",
+					tarCmd,
+					componentPath.DataInjections,
+					config.GetDataInjectionMarker(),
+					kubectlCmd,
+					untarCmd,
+				)
+
+				if err := exec.CmdWithPrint(shell, append(shellArgs, cpPodCmd)...); err != nil {
+					return fmt.Errorf("could not save the Zarf sync completion file after injection into pod %s: %w", pod.Name, err)
+				}
 			}
-		}
 
-		// Do not look for a specific container after injection in case they are running an init container
-		podOnlyTarget := podLookup{
-			Namespace: data.Target.Namespace,
-			Selector:  data.Target.Selector,
-		}
+			// Do not look for a specific container after injection in case they are running an init container
+			podOnlyTarget := podLookup{
+				Namespace: data.Target.Namespace,
+				Selector:  data.Target.Selector,
+			}
 
-		// Block one final time to make sure at least one pod has come up and injected the data
-		// Using only the pod as the final selector because we don't know what the container name will be
-		// Still using the init container filter to make sure we have the right running pod
-		_ = waitForPodsAndContainers(ctx, c.Clientset, podOnlyTarget, podFilterByInitContainer)
+			// Block one final time to make sure at least one pod has come up and injected the data
+			// Using only the pod as the final selector because we don't know what the container name will be
+			// Still using the init container filter to make sure we have the right running pod
+			_, err = waitForPodsAndContainers(ctx, c.Clientset, podOnlyTarget, podFilterByInitContainer)
+			if err != nil {
+				return err
+			}
 
-		// Cleanup now to reduce disk pressure
-		_ = os.RemoveAll(source)
+			// Cleanup now to reduce disk pressure
+			err = os.RemoveAll(source)
+			if err != nil {
+				return err
+			}
 
-		// Return to stop the loop
-		return
+			// Return to stop the loop
+			return nil
+		}
 	}
 }
 
@@ -173,7 +177,7 @@ type podFilter func(pod corev1.Pod) bool
 // It will wait up to 90 seconds for the pods to be found and will return a list of matching pod names
 // If the timeout is reached, an empty list will be returned.
 // TODO: Test, refactor and/or remove.
-func waitForPodsAndContainers(ctx context.Context, clientset kubernetes.Interface, target podLookup, include podFilter) []corev1.Pod {
+func waitForPodsAndContainers(ctx context.Context, clientset kubernetes.Interface, target podLookup, include podFilter) ([]corev1.Pod, error) {
 	waitCtx, cancel := context.WithTimeout(ctx, 90*time.Second)
 	defer cancel()
 
@@ -183,16 +187,14 @@ func waitForPodsAndContainers(ctx context.Context, clientset kubernetes.Interfac
 	for {
 		select {
 		case <-waitCtx.Done():
-			message.Debug("Pod lookup failed: %v", ctx.Err())
-			return nil
+			return nil, ctx.Err()
 		case <-timer.C:
 			listOpts := metav1.ListOptions{
 				LabelSelector: target.Selector,
 			}
 			podList, err := clientset.CoreV1().Pods(target.Namespace).List(ctx, listOpts)
 			if err != nil {
-				message.Debug("Unable to find matching pods: %w", err)
-				return nil
+				return nil, err
 			}
 
 			message.Debug("Found %d pods for target %#v", len(podList.Items), target)
@@ -245,7 +247,7 @@ func waitForPodsAndContainers(ctx context.Context, clientset kubernetes.Interfac
 				}
 			}
 			if len(readyPods) > 0 {
-				return readyPods
+				return readyPods, nil
 			}
 			timer.Reset(3 * time.Second)
 		}

src/pkg/packager/deploy.go

@@ -14,9 +14,10 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
-	"sync"
 	"time"
 
+	"golang.org/x/sync/errgroup"
+
 	corev1 "k8s.io/api/core/v1"
 	kerrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -293,7 +294,6 @@ func (p *Packager) deployComponent(ctx context.Context, component types.ZarfComp
 	hasCharts := len(component.Charts) > 0
 	hasManifests := len(component.Manifests) > 0
 	hasRepos := len(component.Repos) > 0
-	hasDataInjections := len(component.DataInjections) > 0
 	hasFiles := len(component.Files) > 0
 
 	onDeploy := component.Actions.OnDeploy
@@ -344,14 +344,11 @@ func (p *Packager) deployComponent(ctx context.Context, component types.ZarfComp
 		}
 	}
 
-	if hasDataInjections {
-		waitGroup := sync.WaitGroup{}
-		defer waitGroup.Wait()
-
-		for idx, data := range component.DataInjections {
-			waitGroup.Add(1)
-			go p.cluster.HandleDataInjection(ctx, &waitGroup, data, componentPath, idx)
-		}
+	g, gCtx := errgroup.WithContext(ctx)
+	for idx, data := range component.DataInjections {
+		g.Go(func() error {
+			return p.cluster.HandleDataInjection(gCtx, data, componentPath, idx)
+		})
 	}
 
 	if hasCharts || hasManifests {
@@ -364,6 +361,10 @@ func (p *Packager) deployComponent(ctx context.Context, component types.ZarfComp
 		return charts, fmt.Errorf("unable to run component after action: %w", err)
 	}
 
+	err = g.Wait()
+	if err != nil {
+		return nil, err
+	}
 	return charts, nil
 }