Re: Showing changes between archives

[Edward Speyer <edward@tropic.org.uk>]

On 21 January 2015 at 23:25, Colin Percival <cperciva@tarsnap.com> wrote:

Huh, I'd expect more "new data" in that case.  Or is the 8.8 MB after
compression?  Tar headers compress very well...

Yup, it was 8.8MB after compression.

 

Interesting.  The 'link count' isn't included in the default tar header, but
is included if tarsnap decides that it needs to add a pax header.  Something
else must have changed to make tarsnap change its mind about that; if you're
curious, run `tarsnap -r -f archivename | hexdump -C | head -64` and compare
the headers.

Yup, one has a pax header and one doesn't.

I made the archives on two different machines in two different versions of Mac OS X.  The archive with the pax header was created with OS X 10.9 and the non-pax header archives created with OS X 10.10.  Not sure if this is relevant or interesting but thought I'd mention it out of completeness.

Thanks again!

Ed