From: Thomas Harning <harningt@gmail.com>
Date: Mon, 18 Aug 2008 13:37:25 GMT
Subject: Re: Best method of detecting if list of commit refs is a parent
Message-ID: <17B524E9-FDF9-4585-AFBD-A5304E3A4AA6@gmail.com>
In-Reply-To: <7vfxp3ndec.fsf@gitster.siamese.dyndns.org>

On Aug 18, 2008, at 12:41 AM, Junio C Hamano wrote:
>
> If you have bunch of commits A B C D E F and if you would want to know
> which one of them is reachable from X, you could of course run merge- 
> base
> once for each of A..F.  Another way to do this would be to run:
>
> 	git rev-list A B C D E F ^X
>
> and look at the output.  The ones among A..F that appear in the  
> output are
> not reachable from X.  The ones that are reachable from X do not  
> appear in
> the output.
>
> This is because "rev-list" outputs everything reachable from the given
> commits without ^ prefix, excluding the ones that are reacahble from  
> the
> ones prefixed with ^.
Perfect!  Now... is there built-in way to invert this to list those  
that 'are' reachable..... Or would the inverse really end up  
calculating the difference between input list and output list?