On Sunday 03 December 2006 20:23, Landon Fuller wrote:
> 
> On Dec 3, 2006, at 7:26 AM, Kern Sibbald wrote:
> 
> > Volume data format, and it has known bugs (digest problems), which  
> > means that
> > if any fixes involve changing the data format (as one does that I  
> > found this
> > morning)
> 
> If you're referring to digesting/signing sparse blocks (the change  
> you committed this morning), 

Yes.

> that is absolutely not a bug. All file   
> data must be hashed for the signature, or it will be possible to  
> insert data undetected. Even blocks of 0s can have a serious impact  
> on the meaning of a file.

In a true sparse file it is not file data but holes.  

It will not be possible to insert data undetected because if anyone inserts 
any new data, the digest/signature will be different.   I cannot imagine that 
it would ever be a good idea to digest data that is not written to the tape.

> 
> -landonf
> 

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