Re: [PATCH] attr: don't confuse prefixes with leading directories

> Sorry for sending a half-baked response.  The initial draft of my response
> had just "that makes sense" and nothing else in the first paragraph.
> 
> If the original meant to be defensive, it should have had your "extra
> defensive" die(), but it didn't.
> [...]
> diff --git a/attr.c b/attr.c
> index ad7eb9c..4d3b61a 100644
> --- a/attr.c
> +++ b/attr.c
> @@ -566,7 +567,9 @@ static void prepare_attr_stack(const char *path, int dirlen)
>  
>  	/*
>  	 * Pop the ones from directories that are not the prefix of
> -	 * the path we are checking.
> +	 * the path we are checking. Break out of the loop when we see
> +	 * the root one (whose origin is an empty string "") or the builtin
> +	 * one (whose origin is NULL) without popping it.
>  	 */
>  	while (attr_stack->origin) {
>  		int namelen = strlen(attr_stack->origin);
> @@ -586,6 +589,13 @@ static void prepare_attr_stack(const char *path, int dirlen)
>  	 * Read from parent directories and push them down
>  	 */
>  	if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
> +		/*
> +		 * bootstrap_attr_stack() should have added, and the
> +		 * above loop should have stopped before popping, the
> +		 * root element whose attr_stack->origin is set to an
> +		 * empty string.
> +		 */ 
> +		assert(attr_stack->origin);
>  		while (1) {
>  			char *cp;