[Duplicity-talk] using pax header for file checksums

[edgar . soldin]

just stumbled over the pax header possibility in tarfile.py and started 
wondering if it would be a valid option to save a file's checksum into while 
keeping backward compatibility with older backup chains.

rationale would be to save these into the signature files thus enabling 
checksum based comparison between archived and current files, saving bandwidth 
as opposed to doing bitwise comparison to restored instances.

can anybody more familiar with the tar format shed some light on that? 
..ede/duply.net