[DRAFT] Add bundle init command to initialize templates

cmd/bundle/init.go

@@ -0,0 +1,60 @@
+package bundle
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+
+	"github.com/databricks/cli/libs/git"
+	"github.com/databricks/cli/libs/template"
+	"github.com/spf13/cobra"
+)
+
+var initCmd = &cobra.Command{
+	Use:   "init TEMPLATE_PATH",
+	Short: "Initialize Template",
+	Long:  `Initialize template`,
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		templateURL := args[0]
+		tmpDir := os.TempDir()
+		templateDir := filepath.Join(tmpDir, templateURL)
+		ctx := cmd.Context()
+
+		err := os.MkdirAll(templateDir, 0755)
+		if err != nil {
+			return err
+		}
+
+		// TODO: should we delete this directory once we are done with it?
+		// It's a destructive action that can be risky
+		err = git.Clone(ctx, templateURL, "", templateDir)
+		if err != nil {
+			return err
+		}
+
+		// TODO: substitute to a read config method that respects the schema
+		// and prompts for input variables
+		b, err := os.ReadFile(configFile)
+		if err != nil {
+			return err
+		}
+		config := make(map[string]any)
+		err = json.Unmarshal(b, &config)
+		if err != nil {
+			return err
+		}
+		return template.Materialize(ctx, config, templateDir, projectDir)
+	},
+}
+
+var configFile string
+var projectDir string
+
+func init() {
+	initCmd.Flags().StringVar(&configFile, "config-file", "", "Input parameters for template initialization.")
+	initCmd.Flags().StringVar(&projectDir, "project-dir", "", "The project will be initialized in this directory.")
+	initCmd.MarkFlagRequired("config-file")
+	initCmd.MarkFlagRequired("output-dir")
+	AddCommand(initCmd)
+}

libs/template/materialize.go

@@ -0,0 +1,24 @@
+package template
+
+import (
+	"context"
+	"path/filepath"
+)
+
+const libraryDirName = "library"
+const templateDirName = "template"
+
+func Materialize(ctx context.Context, config map[string]any, templateRoot, instanceRoot string) error {
+	templatePath := filepath.Join(templateRoot, templateDirName)
+	libraryPath := filepath.Join(templateRoot, libraryDirName)
+
+	r, err := newRenderer(ctx, config, templatePath, libraryPath, instanceRoot)
+	if err != nil {
+		return err
+	}
+	err = r.walk()
+	if err != nil {
+		return err
+	}
+	return r.persistToDisk()
+}