cli/cmd: cleanups part 1

cli/cmd/cluster-apply.go

@@ -51,59 +51,65 @@ func init() {
 	pf.BoolVarP(&upgradeKubelets, "upgrade-kubelets", "", false, "Experimentally upgrade self-hosted kubelets")
 }
 
-//nolint:funlen
 func runClusterApply(cmd *cobra.Command, args []string) {
 	contextLogger := log.WithFields(log.Fields{
 		"command": "lokoctl cluster apply",
 		"args":    args,
 	})
 
-	ex, p, lokoConfig, assetDir := initialize(contextLogger)
+	if err := clusterApply(contextLogger); err != nil {
+		contextLogger.Fatalf("Applying cluster failed: %v", err)
+	}
+}
 
-	exists := clusterExists(contextLogger, ex)
+//nolint:funlen
+func clusterApply(contextLogger *log.Entry) error {
+	c := initialize(contextLogger)
+
+	exists := clusterExists(contextLogger, &c.terraformExecutor)
 	if exists && !confirm {
 		// TODO: We could plan to a file and use it when installing.
-		if err := ex.Plan(); err != nil {
-			contextLogger.Fatalf("Failed to reconcile cluster state: %v", err)
+		if err := c.terraformExecutor.Plan(); err != nil {
+			return fmt.Errorf("reconciling cluster state: %v", err)
 		}
 
 		if !askForConfirmation("Do you want to proceed with cluster apply?") {
 			contextLogger.Println("Cluster apply cancelled")
 
-			return
+			return nil
 		}
 	}
 
-	if err := p.Apply(ex); err != nil {
-		contextLogger.Fatalf("Error applying cluster: %v", err)
+	if err := c.platform.Apply(&c.terraformExecutor); err != nil {
+		return fmt.Errorf("applying platform: %v", err)
 	}
 
-	fmt.Printf("\nYour configurations are stored in %s\n", assetDir)
+	fmt.Printf("\nYour configurations are stored in %s\n", c.assetDir)
 
-	kubeconfig, err := getKubeconfig(contextLogger, lokoConfig, true)
+	kubeconfig, err := getKubeconfig(contextLogger, c.lokomotiveConfig, true)
 	if err != nil {
-		contextLogger.Fatalf("Failed to get kubeconfig: %v", err)
+		return fmt.Errorf("getting kubeconfig: %v", err)
 	}
 
-	if err := verifyCluster(kubeconfig, p.Meta().ExpectedNodes); err != nil {
-		contextLogger.Fatalf("Verify cluster: %v", err)
+	if err := verifyCluster(kubeconfig, c.platform.Meta().ExpectedNodes); err != nil {
+		return fmt.Errorf("verifying cluster: %v", err)
 	}
 
 	// Update all the pre installed namespaces with lokomotive specific label.
 	// `lokomotive.kinvolk.io/name: <namespace_name>`.
 	if err := updateInstalledNamespaces(kubeconfig); err != nil {
-		contextLogger.Fatalf("Updating installed namespace: %v", err)
+		return fmt.Errorf("updating installed namespace: %v", err)
 	}
 
 	// Do controlplane upgrades only if cluster already exists and it is not a managed platform.
-	if exists && !p.Meta().Managed {
+	if exists && !c.platform.Meta().Managed {
 		fmt.Printf("\nEnsuring that cluster controlplane is up to date.\n")
 
 		cu := controlplaneUpdater{
 			kubeconfig:    kubeconfig,
-			assetDir:      assetDir,
+			assetDir:      c.assetDir,
 			contextLogger: *contextLogger,
-			ex:            *ex,
+			ex:            c.terraformExecutor,
 		}
 
 		charts := platform.CommonControlPlaneCharts()
@@ -120,28 +126,30 @@ func runClusterApply(cmd *cobra.Command, args []string) {
 		}
 	}
 
-	if ph, ok := p.(platform.PlatformWithPostApplyHook); ok {
+	if ph, ok := c.platform.(platform.PlatformWithPostApplyHook); ok {
 		if err := ph.PostApplyHook(kubeconfig); err != nil {
-			contextLogger.Fatalf("Running platform post install hook failed: %v", err)
+			return fmt.Errorf("running platform post install hook: %v", err)
 		}
 	}
 
 	if skipComponents {
-		return
+		return nil
 	}
 
 	componentsToApply := []string{}
-	for _, component := range lokoConfig.RootConfig.Components {
+	for _, component := range c.lokomotiveConfig.RootConfig.Components {
 		componentsToApply = append(componentsToApply, component.Name)
 	}
 
 	contextLogger.Println("Applying component configuration")
 
 	if len(componentsToApply) > 0 {
-		if err := applyComponents(lokoConfig, kubeconfig, componentsToApply...); err != nil {
-			contextLogger.Fatalf("Applying component configuration failed: %v", err)
+		if err := applyComponents(c.lokomotiveConfig, kubeconfig, componentsToApply...); err != nil {
+			return fmt.Errorf("applying component configuration: %v", err)
 		}
 	}
+
+	return nil
 }
 
 func verifyCluster(kubeconfig []byte, expectedNodes int) error {

cli/cmd/cluster-destroy.go

@@ -15,6 +15,8 @@
 package cmd
 
 import (
+	"fmt"
+
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
@@ -40,26 +42,35 @@ func runClusterDestroy(cmd *cobra.Command, args []string) {
 		"args":    args,
 	})
 
-	ex, p, _, _ := initialize(contextLogger)
+	if err := clusterDestroy(contextLogger); err != nil {
+		contextLogger.Fatalf("Destroying cluster: %v", err)
+	}
+}
+
+func clusterDestroy(contextLogger *log.Entry) error {
+	c := initialize(contextLogger)
 
-	if !clusterExists(contextLogger, ex) {
+	if !clusterExists(contextLogger, &c.terraformExecutor) {
 		contextLogger.Println("Cluster already destroyed, nothing to do")
 
-		return
+		return nil
 	}
 
 	if !confirm {
 		confirmation := askForConfirmation("WARNING: This action cannot be undone. Do you really want to destroy the cluster?")
 		if !confirmation {
 			contextLogger.Println("Cluster destroy canceled")
-			return
+
+			return nil
 		}
 	}
 
-	if err := p.Destroy(ex); err != nil {
-		contextLogger.Fatalf("Error destroying cluster: %v", err)
+	if err := c.platform.Destroy(&c.terraformExecutor); err != nil {
+		return fmt.Errorf("destroying cluster: %v", err)
 	}
 
 	contextLogger.Println("Cluster destroyed successfully")
 	contextLogger.Println("You can safely remove the assets directory now")
+
+	return nil
 }

cli/cmd/cluster.go

@@ -18,7 +18,7 @@ import (
 	"fmt"
 
 	"github.com/mitchellh/go-homedir"
-	"github.com/sirupsen/logrus"
+	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"helm.sh/helm/v3/pkg/action"
 	"helm.sh/helm/v3/pkg/chart"
@@ -41,11 +41,20 @@ func init() {
 	RootCmd.AddCommand(clusterCmd)
 }
 
+// cluster is a temporary helper struct to aggregate objects which are used
+// for managing the cluster and components.
+type cluster struct {
+	terraformExecutor terraform.Executor
+	platform          platform.Platform
+	lokomotiveConfig  *config.Config
+	assetDir          string
+}
+
 // initialize does common initialization actions between cluster operations
 // and returns created objects to the caller for further use.
-func initialize(contextLogger *logrus.Entry) (*terraform.Executor, platform.Platform, *config.Config, string) {
+func initialize(contextLogger *log.Entry) *cluster {
 	lokoConfig, diags := getLokoConfig()
-	if len(diags) > 0 {
+	if diags.HasErrors() {
 		contextLogger.Fatal(diags)
 	}
 
@@ -85,12 +94,17 @@ func initialize(contextLogger *logrus.Entry) (*terraform.Executor, platform.Plat
 
 	ex := initializeTerraform(contextLogger, p, b)
 
-	return ex, p, lokoConfig, assetDir
+	return &cluster{
+		terraformExecutor: *ex,
+		platform:          p,
+		lokomotiveConfig:  lokoConfig,
+		assetDir:          assetDir,
+	}
 }
 
 // initializeTerraform initialized Terraform directory using given backend and platform
 // and returns configured executor.
-func initializeTerraform(contextLogger *logrus.Entry, p platform.Platform, b backend.Backend) *terraform.Executor {
+func initializeTerraform(contextLogger *log.Entry, p platform.Platform, b backend.Backend) *terraform.Executor {
 	assetDir, err := homedir.Expand(p.Meta().AssetDir)
 	if err != nil {
 		contextLogger.Fatalf("Error expanding path: %v", err)
@@ -131,7 +145,7 @@ func initializeTerraform(contextLogger *logrus.Entry, p platform.Platform, b bac
 // clusterExists determines if cluster has already been created by getting all
 // outputs from the Terraform. If there is any output defined, it means 'terraform apply'
 // run at least once.
-func clusterExists(contextLogger *logrus.Entry, ex *terraform.Executor) bool {
+func clusterExists(contextLogger *log.Entry, ex *terraform.Executor) bool {
 	o := map[string]interface{}{}
 
 	if err := ex.Output("", &o); err != nil {
@@ -144,7 +158,7 @@ func clusterExists(contextLogger *logrus.Entry, ex *terraform.Executor) bool {
 type controlplaneUpdater struct {
 	kubeconfig    []byte
 	assetDir      string
-	contextLogger logrus.Entry
+	contextLogger log.Entry
 	ex            terraform.Executor
 }
 
@@ -176,7 +190,7 @@ func (c controlplaneUpdater) getControlplaneValues(name string) (map[string]inte
 }
 
 func (c controlplaneUpdater) upgradeComponent(component, namespace string) {
-	contextLogger := c.contextLogger.WithFields(logrus.Fields{
+	contextLogger := c.contextLogger.WithFields(log.Fields{
 		"action":    "controlplane-upgrade",
 		"component": component,
 	})

cli/cmd/component-apply.go

@@ -62,14 +62,12 @@ func runApply(cmd *cobra.Command, args []string) {
 	}
 
 	lokoConfig, diags := getLokoConfig()
-	if len(diags) > 0 {
+	if diags.HasErrors() {
 		contextLogger.Fatal(diags)
 	}
 
-	var componentsToApply []string
-	if len(args) > 0 {
-		componentsToApply = append(componentsToApply, args...)
-	} else {
+	componentsToApply := args
+	if len(componentsToApply) == 0 {
 		for _, component := range lokoConfig.RootConfig.Components {
 			componentsToApply = append(componentsToApply, component.Name)
 		}
@@ -97,7 +95,7 @@ func applyComponents(lokoConfig *config.Config, kubeconfig []byte, componentName
 
 		componentConfigBody := lokoConfig.LoadComponentConfigBody(componentName)
 
-		if diags := component.LoadConfig(componentConfigBody, lokoConfig.EvalContext); len(diags) > 0 {
+		if diags := component.LoadConfig(componentConfigBody, lokoConfig.EvalContext); diags.HasErrors() {
 			fmt.Printf("%v\n", diags)
 			return diags
 		}

cli/cmd/component-delete.go

@@ -63,7 +63,7 @@ func runDelete(cmd *cobra.Command, args []string) {
 	}
 
 	lokoConfig, diags := getLokoConfig()
-	if len(diags) > 0 {
+	if diags.HasErrors() {
 		contextLogger.Fatal(diags)
 	}
 

cli/cmd/utils.go

@@ -22,7 +22,7 @@ import (
 
 	"github.com/hashicorp/hcl/v2"
 	"github.com/mitchellh/go-homedir"
-	"github.com/sirupsen/logrus"
+	log "github.com/sirupsen/logrus"
 	"github.com/spf13/viper"
 
 	"github.com/kinvolk/lokomotive/pkg/backend"
@@ -86,7 +86,7 @@ func getConfiguredPlatform(lokoConfig *config.Config, require bool) (platform.Pl
 // getKubeconfig finds the right kubeconfig file to use for an action and returns it's content.
 //
 // If platform is required and user do not have it configured, an error is returned.
-func getKubeconfig(contextLogger *logrus.Entry, lokoConfig *config.Config, platformRequired bool) ([]byte, error) {
+func getKubeconfig(contextLogger *log.Entry, lokoConfig *config.Config, platformRequired bool) ([]byte, error) {
 	sources, err := getKubeconfigSource(contextLogger, lokoConfig, platformRequired)
 	if err != nil {
 		return nil, fmt.Errorf("selecting kubeconfig source: %w", err)
@@ -126,7 +126,7 @@ func getKubeconfig(contextLogger *logrus.Entry, lokoConfig *config.Config, platf
 //
 // - kubeconfig from ~/.kube/config file.
 //
-func getKubeconfigSource(contextLogger *logrus.Entry, lokoConfig *config.Config, platformRequired bool) ([]string, error) { //nolint:lll
+func getKubeconfigSource(contextLogger *log.Entry, lokoConfig *config.Config, platformRequired bool) ([]string, error) { //nolint:lll
 	// Always try reading platform configuration.
 	p, diags := getConfiguredPlatform(lokoConfig, platformRequired)
 	if diags.HasErrors() {
@@ -183,15 +183,15 @@ func getLokoConfig() (*config.Config, hcl.Diagnostics) {
 
 // readKubeconfigFromTerraformState initializes Terraform and
 // reads content of cluster kubeconfig file from the Terraform.
-func readKubeconfigFromTerraformState(contextLogger *logrus.Entry) ([]byte, error) {
+func readKubeconfigFromTerraformState(contextLogger *log.Entry) ([]byte, error) {
 	contextLogger.Warn("Kubeconfig file not found in assets directory, pulling kubeconfig from " +
 		"Terraform state, this might be slow. Run 'lokoctl cluster apply' to fix it.")
 
-	ex, _, _, _ := initialize(contextLogger) //nolint:dogsled
+	c := initialize(contextLogger)
 
 	kubeconfig := ""
 
-	if err := ex.Output(kubeconfigTerraformOutputKey, &kubeconfig); err != nil {
+	if err := c.terraformExecutor.Output(kubeconfigTerraformOutputKey, &kubeconfig); err != nil {
 		return nil, fmt.Errorf("reading kubeconfig file content from Terraform state: %w", err)
 	}