Re: [PATCH] add: do not rely on dtype being NULL behavior

> Nguyễn Thái Ngọc Duy  <pclouds@gmail.com> writes:
>
>> Commit c84de70 (excluded_1(): support exclude files in index -
>> 2009-08-20) added support for excluded() where dtype can be NULL. It
>> was designed specifically for index matching because there was no
>> other way to extract dtype information from index. It did not support
>> wildcard matching (for example, "a*/" pattern would fail to match).
>>
>> The code was probably misread when commit 108da0d (git add: Add the
>> "--ignore-missing" option for the dry run - 2010-07-10) was made
>> because DT_UNKNOWN happens to be zero (NULL) too.
>>
>> Do not pass DT_UNKNOWN/NULL to excluded(), instead pass a pointer to a
>> variable that contains DT_UNKNOWN. The real dtype will be extracted
>> from worktree by excluded(), as expected.
>>
>> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
>> ---
>>  I do not add tests for the "a*/" failure above because I plan
>>  to fix it. Expect c84de70 will be reverted "soon" (in my timescale)
>>  when sparse checkout can pass real dtype.
>>
>>  builtin/add.c |    3 ++-
>>  dir.c         |    2 +-
>>  2 files changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/builtin/add.c b/builtin/add.c
>> index 56a4e0a..1a4672d 100644
>> --- a/builtin/add.c
>> +++ b/builtin/add.c
>> @@ -446,7 +446,8 @@ int cmd_add(int argc, const char **argv, const char *prefix)
>>                       if (!seen[i] && pathspec[i][0]
>>                           && !file_exists(pathspec[i])) {
>>                               if (ignore_missing) {
>> -                                     if (excluded(&dir, pathspec[i], DT_UNKNOWN))
>> +                                     int dtype = DT_UNKNOWN;
>> +                                     if (excluded(&dir, pathspec[i], &dtype))
>>                                               dir_add_ignored(&dir, pathspec[i], strlen(pathspec[i]));
>>                               } else
>>                                       die("pathspec '%s' did not match any files",
>> diff --git a/dir.c b/dir.c
>> index b2dfb69..c4bed66 100644
>> --- a/dir.c
>> +++ b/dir.c
>> @@ -359,7 +359,7 @@ int excluded_from_list(const char *pathname,
>>                       int to_exclude = x->to_exclude;
>>
>>                       if (x->flags & EXC_FLAG_MUSTBEDIR) {
>> -                             if (!dtype) {
>> +                             if (dtype != NULL) {
>
> Hmm, are you sure about this part?