Re: [PATCH 01/24] dir.c: optionally compute sha-1 of a .gitignore file

> -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);