[HOLD 3/4] check_packed_git_idx: attempt to handle ENOMEM from mmap

[Eric Wong <e@xxxxxxxxx>]

Eric Wong <e@xxxxxxxxx> wrote:
> --- a/packfile.c
> +++ b/packfile.c
> @@ -97,7 +97,11 @@ static int check_packed_git_idx(const char *path, struct packed_git *p)
>  		close(fd);
>  		return error("index file %s is too small", path);
>  	}
> -	idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
> +	do {
> +		idx_map = xmmap_gently(NULL, idx_size, PROT_READ, MAP_PRIVATE,
> +					fd, 0);
> +	} while (idx_map == MAP_FAILED && errno == ENOMEM
> +		&& unuse_one_window(p));

Oops, I dropped extra error handling here :x

>  	close(fd);
>  
>  	ret = load_idx(path, hashsz, idx_map, idx_size, p);