From: Derrick Stolee <stolee@gmail.com>
Date: Sat, 20 Apr 2019 21:01:23 GMT
Subject: Re: [PATCH] t5304: add a test for pruning with bitmaps
Message-ID: <78a60be8-414e-cd32-8eb2-36b47702c10d@gmail.com>
In-Reply-To: <20190420032435.GA3559@sigill.intra.peff.net>

On 4/19/2019 11:24 PM, Jeff King wrote:
> Try running t5304 with this:
> 
> diff --git a/reachable.c b/reachable.c
> index eba6f64e01..7ec73ef43f 100644
> --- a/reachable.c
> +++ b/reachable.c
> @@ -191,6 +191,8 @@ static int mark_object_seen(const struct object_id *oid,
>  	if (!obj)
>  		die("unable to create object '%s'", oid_to_hex(oid));
>  
> +	if (!(obj->flags & SEEN))
> +		die("seen flag not already there");
>  	obj->flags |= SEEN;
>  	return 0;
>  }
> 
> which shows that we are indeed freshly setting SEEN on some objects.

Good point! Thanks for clearing that up for me.
 
> Interestingly, I don't _think_ you can cause an object to get pruned
> accidentally here, because:

[snip]

I appreciate the additional context that you gave (and I snipped). This
makes me comfortable accepting this test as an exercise of the code (to
guard against future changes that create failures like null-refs) and we
will need to rely on the performance suite to catch issues like removing
the SEEN markers that I had tested.

Thanks,
-Stolee