bug#8154: du: issue with `--files0-from=DIR'

[Jim Meyering]

Paul Eggert wrote:
> On 03/02/2011 07:09 AM, Jim Meyering wrote:
>> -  struct argv_iterator *ai = malloc (sizeof *ai);
>> +  struct argv_iterator *ai;
>> +  struct stat st;
>> +
>> +  if (fstat (fileno (fp),&st) == 0&&  S_ISDIR (st.st_mode))
>> +    {
>> +      errno = EISDIR;
>> +      return NULL;
>> +    }
>> +
>> +  ai = malloc (sizeof *ai);
>
> My kneejerk reaction is that this part of the patch
> should not be needed (though other fixes obviously are).
> There are lots of reasons that the stream could fail:
> why check for directories specially?  Just let the
> stream fail in the way that it normally would; this
> keeps the code smaller and simpler.  On an ancient
> host where "cat dir/" works, "du --files0-from=dir/"
> should not arbitrarily fail.

I think you're right.  The added complexity (both here
and in each client) is not worth the theoretical gain
in error-handling uniformity.

If new tests induce false-positive failure due
to differences in how reading from a directory works
under the covers, we can deal with it in the tests.

Thanks!