On Thu, Feb 12, 2015 at 4:23 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx> writes:
>
>> -int add_excludes_from_file_to_list(const char *fname,
>> - const char *base,
>> - int baselen,
>> - struct exclude_list *el,
>> - int check_index)
>> +/*
>> + * Given a file with name "fname", read it (either from disk, or from
>> + * the index if "check_index" is non-zero), parse it and store the
>> + * exclude rules in "el".
>> + *
>> + * If "ss" is not NULL, compute SHA-1 of the exclude file and fill
>> + * stat data from disk (only valid if add_excludes returns zero). If
>> + * ss_valid is non-zero, "ss" must contain good value as input.
>> + */
>> +static int add_excludes(const char *fname, const char *base, int baselen,
>> + struct exclude_list *el, int check_index,
>> + struct sha1_stat *sha1_stat)
>> ...
>> @@ -571,6 +588,21 @@ int add_excludes_from_file_to_list(const char *fname,
>> }
>> buf[size++] = '\n';
>> close(fd);
>> + if (sha1_stat) {
>> + int pos;
>> + if (sha1_stat->valid &&
>> + !match_stat_data(&sha1_stat->stat, &st))
>> + ; /* no content change, ss->sha1 still good */
>> + else if (check_index &&
>> + (pos = cache_name_pos(fname, strlen(fname))) >= 0 &&
>> + !ce_stage(active_cache[pos]) &&
>> + ce_uptodate(active_cache[pos]))
>> + hashcpy(sha1_stat->sha1, active_cache[pos]->sha1);
>> + else
>> + hash_sha1_file(buf, size, "blob", sha1_stat->sha1);
>
> I do not think this would work well on DOS.
>
> This helper function originally is meant to work *only* on the
> checked out representation of the file and that is what is read by
> read_in_full(), and that is the reason why it handles the case where
> the contents of buf[] happens to be CRLF terminated in the function.
>
> If you want to detect the content changes across working tree, index
> and the tree objects by reusing hash_sha1_file(), however, you must
> not feed the checked out (aka "smudged") representation to it.
> You'd need to turn it into "cleaned" representation by doing the
> equivalent of calling index_path(). Some helpers in the callchain
> that originates from index_path() might directly be reusable for
> your purpose.
Urgh.. you're right this test would fail when some filters are
involved. I'm not sure if we want to check the cleaned version though.
What matters to exclude machinery is the checkout version. I think for
now we fall back to hashing .gitignore content. Perhaps later we could
make an exception for cr/lf conversion (and just that, not generic
filters, doing content conversion here sounds like a bad idea).
--
Duy
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