Subject: Re: [PATCH 1/2] connected: verify promisor-ness of partial clone

From: Jonathan Nieder <[email-masked]>
Date: Wed, 29 Jan 2020 12:41:52 -0800

Jonathan Tan wrote:

> Commit dfa33a298d ("clone: do faster object check for partial clones",
> 2019-04-21) optimized the connectivity check done when cloning with
> --filter to check only the existence of objects directly pointed to by
> refs. But this is not sufficient: they also need to be promisor objects.
> Make this check more robust by instead checking that these objects are
> promisor objects, that is, they appear in a promisor pack.
>
> Signed-off-by: Jonathan Tan <[email-masked]>
> ---
>  builtin/clone.c |  5 +++--
>  connected.c     | 19 ++++++++++++++-----
>  connected.h     | 11 ++++++-----
>  3 files changed, 23 insertions(+), 12 deletions(-)

Good call.  Sorry for the slow review.

[...]
> --- a/connected.c
> +++ b/connected.c
> @@ -52,19 +52,28 @@ int check_connected(oid_iterate_fn fn, void *cb_data,
>  		strbuf_release(&idx_file);
>  	}
>  
> -	if (opt->check_refs_only) {
> +	if (opt->check_refs_are_promisor_objects_only) {
>  		/*
>  		 * For partial clones, we don't want to have to do a regular
>  		 * connectivity check because we have to enumerate and exclude
>  		 * all promisor objects (slow), and then the connectivity check
>  		 * itself becomes a no-op because in a partial clone every
>  		 * object is a promisor object. Instead, just make sure we
> -		 * received the objects pointed to by each wanted ref.
> +		 * received, in a promisor packfile, the objects pointed to by
> +		 * each wanted ref.
>  		 */
>  		do {
> -			if (!repo_has_object_file_with_flags(the_repository, &oid,
> -							     OBJECT_INFO_SKIP_FETCH_OBJECT))
> -				return 1;
> +			struct packed_git *p;
> +
> +			for (p = get_all_packs(the_repository); p; p = p->next) {
> +				if (!p->pack_promisor)
> +					continue;
> +				if (find_pack_entry_one(oid.hash, p))
> +					goto promisor_pack_found;
> +			}
> +			return 1;
> +promisor_pack_found:
> +			;
>  		} while (!fn(cb_data, &oid));
>  		return 0;

Yep, does what it says on the tin.

Reviewed-by: Jonathan Nieder <[email-masked]>