Re: [PATCH v3 3/5] refs: teach for_each_ref a flag to avoid recursion

> On Tue, Jan 07, 2014 at 06:58:50PM -0500, Jeff King wrote:
> 
>> +			if (flags & DO_FOR_EACH_NO_RECURSE) {
>> +				struct ref_dir *subdir = get_ref_dir(entry);
>> +				sort_ref_dir(subdir);
>> +				retval = do_for_each_entry_in_dir(subdir, 0,
> 
> Obviously this is totally wrong and inverts the point of the flag. And
> causes something like half of the test suite to fail.
> 
> Michael was nice enough to point it out to me off-list, but well, I have
> to face the brown paper bag at some point. :) In my defense, it was a
> last minute refactor before going to dinner. That is what I get for
> rushing out the series.
> 
> Here's a fixed version of patch 3/5.

> subdirectories, returning each ref it finds. However, in
> some cases we may want to just iterate over the top-level of
> a certain part of the tree.
> 
> The introduction of the "flags" option is a little
> mysterious. We already have a "flags" option that gets stuck
> in a callback struct and ends up interpreted in do_one_ref.
> But the traversal itself does not currently have any flags,
> and it needs to know about this new flag.
> 
> We _could_ introduce this as a completely separate flag
> parameter. But instead, we simply put both flag types into a
> single namespace, and make it available at both sites. This
> is simple, and given that we do not have a proliferation of
> flags (we have had exactly one until now), it is probably
> sufficient.
> 
> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  refs.c | 61 ++++++++++++++++++++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 23 deletions(-)
> 
> diff --git a/refs.c b/refs.c
> index 3926136..b70b018 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -589,6 +589,8 @@ static void sort_ref_dir(struct ref_dir *dir)
>  
>  /* Include broken references in a do_for_each_ref*() iteration: */
>  #define DO_FOR_EACH_INCLUDE_BROKEN 0x01
> +/* Do not recurse into subdirs, just iterate at a single level. */
> +#define DO_FOR_EACH_NO_RECURSE     0x02
>  
>  /*
>   * Return true iff the reference described by entry can be resolved to
> @@ -661,7 +663,8 @@ static int do_one_ref(struct ref_entry *entry, void *cb_data)
>   * called for all references, including broken ones.
>   */
>  static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset,
> -				    each_ref_entry_fn fn, void *cb_data)
> +				    each_ref_entry_fn fn, void *cb_data,
> +				    int flags)
>  {
>  	int i;
>  	assert(dir->sorted == dir->nr);

> [...]
> @@ -817,7 +830,7 @@ static int is_refname_available(const char *refname, const char *oldrefname,
>  	data.conflicting_refname = NULL;
>  
>  	sort_ref_dir(dir);
> -	if (do_for_each_entry_in_dir(dir, 0, name_conflict_fn, &data)) {
> +	if (do_for_each_entry_in_dir(dir, 0, name_conflict_fn, &data, 0)) {
>  		error("'%s' exists; cannot create '%s'",
>  		      data.conflicting_refname, refname);
>  		return 0;
> @@ -1651,7 +1664,8 @@ void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
>   * 0.
>   */
>  static int do_for_each_entry(struct ref_cache *refs, const char *base,
> -			     each_ref_entry_fn fn, void *cb_data)
> +			     each_ref_entry_fn fn, void *cb_data,
> +			     int flags)
>  {
>  	struct packed_ref_cache *packed_ref_cache;
>  	struct ref_dir *loose_dir;