✨ (kustomize/v1) add validation to let users know when the architectu…

…re used to run the plugin is not supported (#2698)

Co-authored-by: Bryce Palmer <everettraven@gmail.com>

Co-authored-by: Bryce Palmer <everettraven@gmail.com>

docs/book/src/plugins/kustomize-v1.md

@@ -4,6 +4,19 @@ The kustomize plugin allows you to scaffold all kustomize manifests used to work
 By using the kustomize plugin, you can create your own language plugins and ensure that you will have the same configurations 
 and features provided by it. 
 
+<aside class="note">
+<h1>Supportability</h1>
+
+This plugin uses [kubernetes-sigs/kustomize](https://github.com/kubernetes-sigs/kustomize) v3 and the architectures supported are: 
+- linux/amd64
+- linux/arm64
+- darwin/amd64
+
+You might want to consider using [kustomize/v2-alpha](./kustomize-v2-alpha.md) if you are looking to scaffold projects in
+other architecture environments. (i.e. if you are looking to scaffold projects with Apple Silicon/M1 (`darwin/arm64`) this plugin 
+will not work, more info: [kubernetes-sigs/kustomize#4612](https://github.com/kubernetes-sigs/kustomize/issues/4612)).
+</aside> 
+
 Note that projects such as [Operator-sdk][sdk] consume the Kubebuilder project as a lib and provide options to work with other languages
 like Ansible and Helm. The kustomize plugin allows them to easily keep a maintained configuration and ensure that all languages have
 the same configuration. It is also helpful if you are looking to provide nice plugins which will perform changes on top of

pkg/plugins/common/kustomize/v1/init.go

@@ -20,8 +20,10 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 
+	log "github.com/sirupsen/logrus"
 	"github.com/spf13/pflag"
 
 	"sigs.k8s.io/kubebuilder/v3/pkg/config"
@@ -33,6 +35,11 @@ import (
 
 var _ plugin.InitSubcommand = &initSubcommand{}
 
+// Verify if the local environment is supported by this plugin
+var supportedArchs = []string{"linux/amd64",
+	"linux/arm64",
+	"darwin/amd64"}
+
 type initSubcommand struct {
 	config config.Config
 
@@ -43,10 +50,17 @@ type initSubcommand struct {
 }
 
 func (p *initSubcommand) UpdateMetadata(cliMeta plugin.CLIMetadata, subcmdMeta *plugin.SubcommandMetadata) {
-	subcmdMeta.Description = `Initialize a common project including the following files:
+	subcmdMeta.Description = fmt.Sprintf(`Initialize a common project including the following files:
   - a "PROJECT" file that stores project configuration
   - several YAML files for project deployment under the "config" directory
-`
+
+  NOTE: The kustomize/v1 plugin used to do this scaffold uses the v3 release (%s).
+Therefore, darwin/arm64 is not supported since Kustomize does not provide v3
+binaries for this architecture. The currently supported architectures are %q. 
+More info: https://github.com/kubernetes-sigs/kustomize/issues/4612.
+
+`, KustomizeVersion, supportedArchs)
+
 	subcmdMeta.Examples = fmt.Sprintf(`  # Initialize a common project with your domain and name in copyright
   %[1]s init --plugins common/v3 --domain example.org
 
@@ -94,6 +108,37 @@ func (p *initSubcommand) InjectConfig(c config.Config) error {
 	return nil
 }
 
+func (p *initSubcommand) PreScaffold(machinery.Filesystem) error {
+	arch := runtime.GOARCH
+	// It probably will never return x86_64. However, we are here checking the support for the binaries
+	// So that, x86_64 means getting the Linux/amd64 binary. Then, we just keep this line to ensure
+	// that it complies with the same code implementation that we have in the targets. In case someone
+	// call the command inform the GOARCH=x86_64 then, we will properly handle the scenario
+	// since it will work successfully and will instal the Linux/amd64 binary via the Makefile target.
+	arch = strings.Replace(arch, "x86_64", "amd64", -1)
+	localPlatform := fmt.Sprintf("%s/%s", strings.TrimSpace(runtime.GOOS), strings.TrimSpace(arch))
+
+	if !hasSupportFor(localPlatform) {
+		log.Warnf("the platform of this environment (%s) is not suppported by kustomize v3 (%s) which is "+
+			"used in this scaffold. You will be unable to download a binary for the kustomize version supported "+
+			"and used by this plugin. The currently supported platforms are: %q",
+			localPlatform,
+			KustomizeVersion,
+			supportedArchs)
+	}
+
+	return nil
+}
+
+func hasSupportFor(localPlatform string) bool {
+	for _, value := range supportedArchs {
+		if value == localPlatform {
+			return true
+		}
+	}
+	return false
+}
+
 func (p *initSubcommand) Scaffold(fs machinery.Filesystem) error {
 	scaffolder := scaffolds.NewInitScaffolder(p.config)
 	scaffolder.InjectFS(fs)