Re: [PATCH v7 23/31] checkout: clean up half-prepared directories in --to mode

> On Sun, Jul 13, 2014 at 12:51 AM, Nguyễn Thái Ngọc Duy
> <pclouds@gmail.com> wrote:
>> +
>> +       junk_pid = getpid();
>> +       atexit(remove_junk);
>> +       sigchain_push_common(remove_junk_on_signal);
>> +
>>         if (mkdir(sb_repo.buf, 0777))
>>                 die_errno(_("could not create directory of '%s'"), sb_repo.buf);
>> +       junk_git_dir = sb_repo.buf;
>
> I've managed to convince myself that, although junk_git_dir becomes a
> dangling pointer by the end of prepare_linked_checkout(), it should
> never afterward be accessed. Perhaps it would make sense to make this
> easier to follow by clearing junk_git_dir when is_junk is cleared?
>
>> +       is_junk = 1;
>>
>>         strbuf_addf(&sb_git, "%s/.git", path);
>>         if (safe_create_leading_directories_const(sb_git.buf))
>>                 die_errno(_("could not create leading directories of '%s'"),
>>                           sb_git.buf);
>> +       junk_work_tree = path;
>>
>>         write_file(sb_git.buf, 1, "gitdir: %s/repos/%s\n",
>>                    real_path(get_git_common_dir()), name);
>> @@ -879,7 +917,14 @@ static int prepare_linked_checkout(const struct checkout_opts *opts,
>>         memset(&cp, 0, sizeof(cp));
>>         cp.git_cmd = 1;
>>         cp.argv = opts->saved_argv;
>> -       return run_command(&cp);
>> +       ret = run_command(&cp);
>> +       if (!ret)
>> +               is_junk = 0;
>
> Here: perhaps also set is_junk_dir to NULL since it otherwise is about
> to become a dangling pointer.