Fix $HOME resolution and webhook namespace

cmd/single/start.go

@@ -3,6 +3,7 @@ package single
 import (
 	"context"
 	"net/http"
+	"os"
 	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
 	ctrlWebhook "sigs.k8s.io/controller-runtime/pkg/webhook"
 
@@ -40,6 +41,7 @@ import (
 )
 
 const defaultNamespace = "all"
+const propellerDefaultNamespace = "flyte"
 
 func startDataCatalog(ctx context.Context, _ DataCatalog) error {
 	if err := datacatalogRepo.Migrate(ctx); err != nil {
@@ -120,7 +122,7 @@ func startPropeller(ctx context.Context, cfg Propeller) error {
 			SyncPeriod:        &propellerCfg.DownstreamEval.Duration,
 			DefaultNamespaces: namespaceConfigs,
 		},
-		NewCache: func (config *rest.Config, options cache.Options) (cache.Cache, error) {
+		NewCache: func(config *rest.Config, options cache.Options) (cache.Cache, error) {
 			k8sCache, err := cache.New(config, options)
 			if err != nil {
 				return k8sCache, err
@@ -141,7 +143,7 @@ func startPropeller(ctx context.Context, cfg Propeller) error {
 			BindAddress: "0",
 		},
 		WebhookServer: ctrlWebhook.NewServer(ctrlWebhook.Options{
-			CertDir: webhookConfig.GetConfig().CertDir,
+			CertDir: webhookConfig.GetConfig().ExpandCertDir(),
 			Port:    webhookConfig.GetConfig().ListenPort,
 		}),
 	}
@@ -162,7 +164,13 @@ func startPropeller(ctx context.Context, cfg Propeller) error {
 				return err
 			}
 			logger.Infof(childCtx, "Starting Webhook server...")
-			return webhookEntrypoint.Run(signals.SetupSignalHandler(childCtx), propellerCfg, webhookConfig.GetConfig(), defaultNamespace, &propellerScope, mgr)
+			// set default namespace for pod template store
+			podNamespace, found := os.LookupEnv(webhookEntrypoint.PodNamespaceEnvVar)
+			if !found {
+				podNamespace = propellerDefaultNamespace
+			}
+
+			return webhookEntrypoint.Run(signals.SetupSignalHandler(childCtx), propellerCfg, webhookConfig.GetConfig(), podNamespace, &propellerScope, mgr)
 		})
 	}
 
@@ -207,7 +215,7 @@ var startCmd = &cobra.Command{
 		for _, serviceName := range []string{otelutils.AdminClientTracer, otelutils.AdminGormTracer, otelutils.AdminServerTracer,
 			otelutils.BlobstoreClientTracer, otelutils.DataCatalogClientTracer, otelutils.DataCatalogGormTracer,
 			otelutils.DataCatalogServerTracer, otelutils.FlytePropellerTracer, otelutils.K8sClientTracer} {
-			if err := otelutils.RegisterTracerProvider(serviceName, otelutils.GetConfig()) ; err != nil {
+			if err := otelutils.RegisterTracerProvider(serviceName, otelutils.GetConfig()); err != nil {
 				logger.Errorf(ctx, "Failed to create otel tracer provider. %v", err)
 				return err
 			}

flyteadmin/pkg/runtime/cluster_resource_provider.go

@@ -1,6 +1,7 @@
 package runtime
 
 import (
+	"os"
 	"time"
 
 	"github.com/flyteorg/flyte/flyteadmin/pkg/runtime/interfaces"
@@ -21,7 +22,7 @@ var clusterResourceConfig = config.MustRegisterSection(clusterResourceKey, &inte
 type ClusterResourceConfigurationProvider struct{}
 
 func (p *ClusterResourceConfigurationProvider) GetTemplatePath() string {
-	return clusterResourceConfig.GetConfig().(*interfaces.ClusterResourceConfig).TemplatePath
+	return os.ExpandEnv(clusterResourceConfig.GetConfig().(*interfaces.ClusterResourceConfig).TemplatePath)
 }
 
 func (p *ClusterResourceConfigurationProvider) GetTemplateData() interfaces.TemplateData {

flytepropeller/cmd/controller/cmd/webhook.go

@@ -118,7 +118,7 @@ func runWebhook(origContext context.Context, propellerCfg *config.Config, cfg *w
 			BindAddress: "0",
 		},
 		WebhookServer: ctrlWebhook.NewServer(ctrlWebhook.Options{
-			CertDir: cfg.CertDir,
+			CertDir: cfg.ExpandCertDir(),
 			Port:    cfg.ListenPort,
 		}),
 	}

flytepropeller/pkg/webhook/config/config.go

@@ -3,6 +3,7 @@
 import (
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
+	"os"
 
 	"github.com/flyteorg/flyte/flytestdlib/config"
 )
@@ -103,6 +104,10 @@
 	VaultSecretManagerConfig VaultSecretManagerConfig `json:"vaultSecretManager" pflag:",Vault Secret Manager config."`
 }
 
+func (c Config) ExpandCertDir() string {
+	return os.ExpandEnv(c.CertDir)
+}
+
 type AWSSecretManagerConfig struct {
 	SidecarImage string                      `json:"sidecarImage" pflag:",Specifies the sidecar docker image to use"`
 	Resources    corev1.ResourceRequirements `json:"resources" pflag:"-,Specifies resource requirements for the init container."`

flytepropeller/pkg/webhook/init_cert.go

@@ -78,21 +78,22 @@
 	}
 
 	if cfg.LocalCert {
-		if _, err := os.Stat(cfg.CertDir); os.IsNotExist(err) {
-			if err := os.Mkdir(cfg.CertDir, folderPerm); err != nil {
+		certPath := cfg.ExpandCertDir()
+		if _, err := os.Stat(certPath); os.IsNotExist(err) {
+			if err := os.Mkdir(certPath, folderPerm); err != nil {
 				return err
 			}
 		}
 
-		if err := os.WriteFile(path.Join(cfg.CertDir, CaCertKey), certs.CaPEM.Bytes(), permission); err != nil {
+		if err := os.WriteFile(path.Join(certPath, CaCertKey), certs.CaPEM.Bytes(), permission); err != nil {
 			return err
 		}
 
-		if err := os.WriteFile(path.Join(cfg.CertDir, ServerCertKey), certs.ServerPEM.Bytes(), permission); err != nil {
+		if err := os.WriteFile(path.Join(certPath, ServerCertKey), certs.ServerPEM.Bytes(), permission); err != nil {
 			return err
 		}
 
-		if err := os.WriteFile(path.Join(cfg.CertDir, ServerCertPrivateKey), certs.PrivateKeyPEM.Bytes(), permission); err != nil {
+		if err := os.WriteFile(path.Join(certPath, ServerCertPrivateKey), certs.PrivateKeyPEM.Bytes(), permission); err != nil {
 			return err
 		}
 	}

flytepropeller/pkg/webhook/pod.go

@@ -1,19 +1,20 @@
-// The PodMutator is a controller-runtime webhook that intercepts Pod Creation events and mutates them. Currently, there
-// is only one registered Mutator, that's the SecretsMutator. It works as follows:
+// Package webhook container PodMutator. It's a controller-runtime webhook that intercepts Pod Creation events and
+// mutates them. Currently, there is only one registered Mutator, that's the SecretsMutator. It works as follows:
 //
-//   - The Webhook only works on Pods. If propeller/plugins launch a resource outside of K8s (or in a separate k8s
+//   - The Webhook only works on Pods. If propeller/plugins launch a resource outside K8s (or in a separate k8s
 //     cluster), it's the responsibility of the plugin to correctly pass secret injection information.
 //   - When a k8s-plugin builds a resource, propeller's PluginManager will automatically inject a label `inject-flyte
 //     -secrets: true` and serialize the secret injection information into the annotations.
 //   - If a plugin does not use the K8sPlugin interface, it's its responsibility to pass secret injection information.
 //   - If a k8s plugin creates a CRD that launches other Pods (e.g. Spark/PyTorch... etc.), it's its responsibility to
 //     make sure the labels/annotations set on the CRD by PluginManager are propagated to those launched Pods. This
 //     ensures secret injection happens no matter how many levels of indirections there are.
-//   - The Webhook expects 'inject-flyte-secrets: true' as a label on the Pod. Otherwise it won't listen/observe that pod.
+//   - The Webhook expects 'inject-flyte-secrets: true' as a label on the Pod. Otherwise, it won't listen/observe that
+//     pod.
 //   - Once it intercepts the admission request, it goes over all registered Mutators and invoke them in the order they
-//     are registered as. If a Mutator fails and it's marked as `required`, the operation will fail and the admission
+//     are registered as. If a Mutator fails, and it's marked as `required`, the operation will fail and the admission
 //     will be rejected.
-//   - The SecretsMutator will attempt to lookup the requested secret from the process environment. If the secret is
+//   - The SecretsMutator will attempt to look up the requested secret from the process environment. If the secret is
 //     already mounted, it'll inject it as plain-text into the Pod Spec (Less secure).
 //   - If it's not found in the environment it'll, instead, fallback to the enabled Secrets Injector (K8s, Confidant,
 //     Vault... etc.).
@@ -30,7 +31,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"k8s.io/apimachinery/pkg/runtime"
 	"net/http"
 	"os"
@@ -148,7 +148,7 @@ func generateMutatePath(gvk schema.GroupVersionKind) string {
 }
 
 func (pm PodMutator) CreateMutationWebhookConfiguration(namespace string) (*admissionregistrationv1.MutatingWebhookConfiguration, error) {
-	caBytes, err := ioutil.ReadFile(filepath.Join(pm.cfg.CertDir, "ca.crt"))
+	caBytes, err := os.ReadFile(filepath.Join(pm.cfg.ExpandCertDir(), "ca.crt"))
 	if err != nil {
 		// ca.crt is optional. If not provided, API Server will assume the webhook is serving SSL using a certificate
 		// issued by a known Cert Authority.

rsts/community/contribute.rst

@@ -389,15 +389,7 @@ that integrates all Flyte components into a single binary.
    go mod tidy
    make compile
 
-   # Step3: Edit the config file: ./flyte-single-binary-local.yaml.
-   # Replace occurrences of $HOME with the actual path of your home directory.
-   sedi=(-i)
-   case "$(uname)" in
-     Darwin*) sedi=(-i "")
-   esac
-   sed "${sedi[@]}" -e "s|\$HOME|${HOME}|g" flyte-single-binary-local.yaml
-
-   # Step 4: Prepare a namespace template for the cluster resource controller.
+   # Step3: Prepare a namespace template for the cluster resource controller.
    # The configuration file "flyte-single-binary-local.yaml" has an entry named cluster_resources.templatePath.
    # This entry needs to direct to a directory containing the templates for the cluster resource controller to use.
    # We will now create a simple template that allows the automatic creation of required namespaces for projects.
@@ -409,7 +401,7 @@ that integrates all Flyte components into a single binary.
    metadata:
      name: '{{ namespace }}'" > $HOME/.flyte/cluster-resource-templates/namespace.yaml
 
-   # Step5: Running the single binary.
+   # Step4: Running the single binary.
    # The POD_NAMESPACE environment variable is necessary for the webhook to function correctly. 
    # You may encounter an error due to `ERROR: duplicate key value violates unique constraint`. Running the command again will solve the problem.
    POD_NAMESPACE=flyte ./flyte start --config flyte-single-binary-local.yaml