Comments all lines from files in ansible-imported-configs after import from ansible

components/cluster/command/import.go

@@ -136,6 +136,11 @@ func newImportCmd() *cobra.Command {
 				return err
 			}
 
+			// comment config to avoid duplicated copy
+			if err = ansible.CommentConfig(clsName); err != nil {
+				return err
+			}
+
 			// backup ansible files
 			if noBackup {
 				// rename original TiDB-Ansible inventory file

pkg/cluster/ansible/import.go

@@ -16,10 +16,12 @@ package ansible
 import (
 	"fmt"
 	"io"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"reflect"
 	"strconv"
+	"strings"
 
 	"github.com/BurntSushi/toml"
 	"github.com/pingcap/errors"
@@ -179,6 +181,31 @@ func diffConfigs(configs []map[string]interface{}) (global map[string]interface{
 	return
 }
 
+// CommentConfig add `#` to the head of each lines for imported configs
+func CommentConfig(clsName string) error {
+	dir := spec.ClusterPath(clsName, spec.AnsibleImportedConfigPath)
+	err := filepath.Walk(dir, func(path string, info fs.FileInfo, err error) error {
+		if err != nil || info.IsDir() || !strings.HasSuffix(info.Name(), ".toml") {
+			return nil
+		}
+
+		content, err := os.ReadFile(path)
+		if err != nil {
+			return errors.Annotatef(err, "read config file %s", path)
+		}
+		lines := strings.Split(string(content), "\n")
+		for idx := range lines {
+			lines[idx] = "# " + lines[idx]
+		}
+		if err := os.WriteFile(path, []byte(strings.Join(lines, "\n")), 0644); err != nil {
+			return errors.Annotatef(err, "write config file %s", path)
+		}
+
+		return nil
+	})
+	return errors.Annotate(err, "comment imported config")
+}
+
 // LoadConfig files to clusterMeta, include tidbservers, tikvservers, pdservers pumpservers and drainerservers
 func LoadConfig(clsName string, cls *spec.ClusterMeta) error {
 	// deal with tidb config