Re: [PATCH] entry.c: use dir-iterator to avoid explicit dir traversal

[Junio C Hamano <gitster@pobox.com>]

Matheus Tavares Bernardino <matheus.bernardino@usp.br> writes:

>> The changes pass the test suite t/ and Travis CI.
>> Please point out any mistakes.
>> ...
>> -               strbuf_addch(path, '/');
>> -               strbuf_addstr(path, de->d_name);
>> -               if (lstat(path->buf, &st))
>> -                       die_errno("cannot lstat '%s'", path->buf);
>> -               if (S_ISDIR(st.st_mode))
>> -                       remove_subtree(path);
>> -               else if (unlink(path->buf))
>> -                       die_errno("cannot unlink '%s'", path->buf);
>> -               strbuf_setlen(path, origlen);
>> +               if (unlink(iter->path.buf)) {
>
> unlink()-ing a directory in Linux will return a EISDIR error. So I
> think you still need to use S_ISDIR() to check if iter->path.buf is a
> directory and call rmdir(), in this case.
>
> However, note that the dir-iterator API gives entries in pre-order.
> I.e. a directory appears before its subentries. In the use case of
> remove_subtree(), though, we need to traverse in post-order, since we
> have to remove the subentries before removing the directory where they
> reside. My suggestion is that you add a preliminary patch,
> implementing a new DIR_ITERATOR_POST_ORDER flag to dir-iterator.h, and
> then use it in this patch.

Thanks for a review and a few hints to nudge a new contributor in
the right direction.  Very much appreciated.

I wonder why the bugs in this patch weren't caught by self test we
already have, by the way.  We need a bit better test coverage,
perhaps?