Re: [PATCH] Add git-unbundle - unpack objects and references for disconnected transfer

> Mark Levedahl <mdl123@verizon.net> writes:
>
>   
>> +# check that the prerequisites exist before unbundling.
>> +for sha1 in $prereqs ; do
>> +	git-rev-parse --verify $sha1 >& /dev/null || die "Prerequisite commit $sha1 not found."
>> +done
>>     
>
> If you are checking only boundary commits this is too weak a
> check and unsafe (we used to have the same bug in http fetch
> long time ago).  You have to make sure not only the object
> exists, but also it is reachable by one of the refs.
>
> One way to check that would be to ask "describe --all" if it can
> find a ref that can reach that commit.  It would error out if
> the commit object exists but is not reachable from any of the
> refs