Re: [PATCH v4 1/4] t6006 (rev-list-format): don't hardcode SHA-1 in expected outputs

>> Why do we want "whatever_7" variables and use "cut -c1-7" to produce
>> them?  Is "7" something we care deeply about?
>> 
>> I think what we care a lot more than "7" that happens to be the
>> current default value is to make sure that, if we ever update the
>> default abbreviation length to a larger value, the abbreviation
>> shown with --format=%h is consistent with the abbreviation that is
>> given by rev-parse --short.
>> 
>>     head1_short=$(git rev-parse --short $head1)
>> 
>> perhaps?
>> ...
>> Likewise.
>> 
>> > +	tree2_7=$(echo $tree2 | cut -c1-7)
>> 
>> Likewise.
> but is there "git something" to return abbreviated tree hash except
> "pretty formats" that is implicitly tested here?