feat: create kube config backup before overwriting

internal/connection/orchestrator.go

@@ -8,6 +8,7 @@ import (
  "github.com/mitchellh/go-homedir"
  "github.com/spf13/viper"
  "gopkg.in/yaml.v2"
+ "io"
  "io/ioutil"
  "os"
  "path/filepath"
@@ -51,9 +52,10 @@ func Connect() {
  fmt.Println(configYaml)
  } else {
  if !viper.GetBool(flags.AutoApprove) {
- confirmOperation("Proceeding will overwrite your local $HOME/.kube/config file. Impact of this is that you will lose " +
- "existing connections to other clusters. Type 'yes' to proceed. You can also consider using the " + flags.PrintToStdout + " " +
- "flag to see instructions on merging the kube config files")
+ confirmOperation("Proceeding will overwrite your local $HOME/.kube/config file. Your old config will be backed up, but the impact of " +
+ "this is that you will lose existing connections to other clusters. You can manually restore your connections by renaming the config " +
+ "backup (in .kube directory) back to 'config' file name. Type 'yes' to proceed. You can also consider using the " +
+ flags.PrintToStdout + "flag to see instructions on merging the kube config files")
  }
 
  saveKubeConfigToFile(configYaml)
@@ -93,10 +95,42 @@ func saveKubeConfigToFile(configYaml string) {
  panicOnError(err)
 
  configFilePath := filepath.Join(home, ".kube", "config")
+
+ // check if file already there, make a backup
+ if _, err := os.Stat(configFilePath); err == nil {
+ copyFile(configFilePath, filepath.Join(home, ".kube", "copsctl_backup_config"))
+ }
+
  err = ioutil.WriteFile(configFilePath, []byte(configYaml), 0600)
  panicOnError(err)
 }
 
+func copyFile(sourceFile, destinationFile string) error {
+ in, err := os.Open(sourceFile)
+
+ if err != nil {
+ return fmt.Errorf("could not open file which was expected to exist: %v, error: %w", sourceFile, err)
+ }
+
+ defer in.Close()
+
+ out, err := os.Create(destinationFile)
+
+ if err != nil {
+ return fmt.Errorf("could not create the destination file: %v, error: %w", destinationFile, err)
+ }
+
+ defer out.Close()
+
+ _, err = io.Copy(out, in)
+
+ if err != nil {
+ return fmt.Errorf("problem copying the file from %v to %v, error: %w", sourceFile, destinationFile, err)
+ }
+
+ return out.Close()
+}
+
 type KubeConfigsContainerV1 struct {
  Version string `yaml:"version"`
  ModifiedAt string `yaml:"modifiedAt"`