[PATCH 4 of 8] blackbox: log working directory version

[timeless]

I'm convinced, please rewrite clowncopter (which means we can drop the
hexfn entirely -- yay).

On Fri, Feb 26, 2016 at 8:42 AM, Yuya Nishihara <yuya at tcha.org> wrote:
>
>> +                        rev = hexfn(ctx.node())
>> +                    else:
>> +                        parents = ctx.parents()
>> +                        rev = ('+'.join([hexfn(p.node()) for p in parents]))
>
> It seems ctx.rev() is always None, and p.node() never be None.