Re: [PATCH 1/2] symlinks: remove PATH_MAX limitation

[Junio C Hamano <gitster@pobox.com>]

Karsten Blees <karsten.blees@gmail.com> writes:

> 'git checkout' fails if a directory is longer than PATH_MAX, because the
> lstat_cache in symlinks.c checks if the leading directory exists using
> PATH_MAX-bounded string operations.
>
> Remove the limitation by using strbuf instead.

Good.

> diff --git a/cache.h b/cache.h
> index df65231..44aa439 100644
> --- a/cache.h
> +++ b/cache.h
> @@ -1090,12 +1090,16 @@ struct checkout {
>  extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
>  
>  struct cache_def {
> -	char path[PATH_MAX + 1];
> -	int len;
> +	struct strbuf path;
>  	int flags;
>  	int track_flags;
>  	int prefix_len_stat_func;
>  };
> +#define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }
> +static inline void cache_def_free(struct cache_def *cache)
> +{
> +	strbuf_release(&cache->path);
> +}

The above cache_def_free(cache) does not free the cache itself, but
only its associated data, so the name cache_def_free() is somewhat
misleading.

It seems that we use the name that consists solely of "something"
and "free" if the pointer to "something" itself is also freed.  For
example "diff_free_filespec_data(struct diff_filespec *)" frees data
associated with the filespec but not the filespec itself, which is
done with "diff_free_filespec()".

Another name that may not be misleading would be cache_def_clear();
I think I'd prefer it over cache_def_free_data().

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