feat: add create config command (#2527)

Signed-off-by: joyceliu <joyceliu@yunify.com>
Co-authored-by: joyceliu <joyceliu@yunify.com>

cmd/kk/app/builtin/create.go

@@ -33,6 +33,7 @@ func NewCreateCommand() *cobra.Command {
 		Short: "Create a cluster or a cluster configuration file",
 	}
 	cmd.AddCommand(newCreateClusterCommand())
+	cmd.AddCommand(newCreateConfigCommand())
 
 	return cmd
 }
@@ -59,3 +60,21 @@ func newCreateClusterCommand() *cobra.Command {
 
 	return cmd
 }
+
+func newCreateConfigCommand() *cobra.Command {
+	o := builtin.NewCreateConfigOptions()
+
+	cmd := &cobra.Command{
+		Use:   "config",
+		Short: "Create a Kubernetes or KubeSphere cluster",
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			return o.Run()
+		},
+	}
+	flags := cmd.Flags()
+	for _, f := range o.Flags().FlagSets {
+		flags.AddFlagSet(f)
+	}
+
+	return cmd
+}

cmd/kk/app/options/builtin/create.go

@@ -21,6 +21,8 @@ package builtin
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 
 	"github.com/cockroachdb/errors"
 	kkcorev1 "github.com/kubesphere/kubekey/api/core/v1"
@@ -29,6 +31,7 @@ import (
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	cliflag "k8s.io/component-base/cli/flag"
 
+	"github.com/kubesphere/kubekey/v4/builtin/core"
 	"github.com/kubesphere/kubekey/v4/cmd/kk/app/options"
 )
 
@@ -37,6 +40,10 @@ const (
 	defaultContainerManager = "docker"
 )
 
+// ======================================================================================
+//                                  create cluster
+// ======================================================================================
+
 // NewCreateClusterOptions for newCreateClusterCommand
 func NewCreateClusterOptions() *CreateClusterOptions {
 	// set default value
@@ -116,3 +123,58 @@ func (o *CreateClusterOptions) completeConfig() error {
 
 	return nil
 }
+
+// ======================================================================================
+//                                  create config
+// ======================================================================================
+
+// NewCreateConfigOptions for newCreateConfigCommand
+func NewCreateConfigOptions() *CreateConfigOptions {
+	// set default value
+	return &CreateConfigOptions{
+		Kubernetes: defaultKubeVersion,
+	}
+}
+
+// CreateConfigOptions for NewCreateConfigOptions
+type CreateConfigOptions struct {
+	// kubernetes version which the config will install.
+	Kubernetes string
+	// OutputDir for config file. if set will generate file in this dir
+	OutputDir string
+}
+
+// Flags add to newCreateConfigCommand
+func (o *CreateConfigOptions) Flags() cliflag.NamedFlagSets {
+	fss := cliflag.NamedFlagSets{}
+	kfs := fss.FlagSet("config")
+	kfs.StringVar(&o.Kubernetes, "with-kubernetes", o.Kubernetes, fmt.Sprintf("Specify a supported version of kubernetes. default is %s", o.Kubernetes))
+	kfs.StringVarP(&o.OutputDir, "output", "o", o.OutputDir, "Output dir for config. if not set will output to stdout")
+
+	return fss
+}
+
+// Run executes the create config operation. It reads the default config file for the specified
+// Kubernetes version and either writes it to the specified output directory or prints it to stdout.
+// If an output directory is specified, it creates a config file named "config-<kubernetes-version>.yaml".
+func (o *CreateConfigOptions) Run() error {
+	// Read the default config file for the specified Kubernetes version
+	data, err := core.Defaults.ReadFile(fmt.Sprintf("defaults/config/%s.yaml", o.Kubernetes))
+	if err != nil {
+		return errors.Wrapf(err, "failed to get local configFile for kube_version: %q.")
+	}
+
+	if o.OutputDir != "" {
+		// Write config to file if output directory is specified
+		filename := filepath.Join(o.OutputDir, fmt.Sprintf("config-%s.yaml", o.Kubernetes))
+		if err := os.WriteFile(filename, data, os.ModePerm); err != nil {
+			return errors.Wrapf(err, "failed to write config file to %s", filename)
+		}
+		fmt.Printf("write config file to %s success.\n", filename)
+	} else {
+		// Print config to stdout if no output directory specified
+		fmt.Println(string(data))
+	}
+
+	return nil
+}