root: data loss disclaimer and prompt for explicit agreement

Author: MichaelMure

root.go

@@ -13,8 +13,13 @@ import (
 
 const rootCommandName = "git-bug-migration"
 
+type rootOpts struct {
+	forReal bool
+}
+
 func NewRootCommand() *cobra.Command {
 	env := newEnv()
+	opts := rootOpts{}
 
 	migrations := []Migration{
 		&migration1.Migration1{},
@@ -36,19 +41,30 @@ To migrate a repository, go to the corresponding repository and run "git-bug-mig
 
 		PreRunE: findRepo(env),
 		RunE: func(_ *cobra.Command, _ []string) error {
-			return runRootCmd(env, migrations)
+			return runRootCmd(env, opts, migrations)
 		},
 
 		SilenceUsage:      true,
 		DisableAutoGenTag: true,
 	}
 
+	flags := cmd.Flags()
+	flags.BoolVar(&opts.forReal, "for-real", false, "Indicate that your really want to run this tool and possibly ruin your data.")
+
 	cmd.AddCommand(newVersionCommand())
 
 	return cmd
 }
 
-func runRootCmd(env *Env, migrations []Migration) error {
+func runRootCmd(env *Env, opts rootOpts, migrations []Migration) error {
+	if !opts.forReal {
+		env.err.Println("DISCLAIMER: This tool exist for your convenience to migrate your data and allow git-bug's authors" +
+			" to break things and make it better. However, this migration tool is quite crude and experimental. DO NOT TRUST IT BLINDLY.\n\n" +
+			"Please make a backup of your .git folder before running it.\n\n" +
+			"When done, run this tool again with the --for-real flag.")
+		os.Exit(1)
+	}
+
 	for i, migration := range migrations {
 		if i > 0 {
 			env.out.Println()