On Friday, August 02, 2019 06:13:53 AM Otto Kekäläinen wrote:
> With the adoption of librsync2 the old MD4 hash is no longer supported
> and thus a non-backwards compatible change is introduced. All backups
> must therefore start from "scratch".
> See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776246

I read a little bit of that reference, but maybe not enough to fully 
understand.

Some questions:

   * has rdiff already switched to libsync2 or is this something you are 
planning?

   * the main one: if the change is made, does that mean that some old backups 
will no longer work and have to be redone?

   * related to above (maybe): that link says that (iiuc) libsync2 can read 
the old md4 hash but (on rewriting) it will write the new hash (whatever it is 
called) -- does that mean that old backups will remain readable?

> 
> Also, the Python 3 rewrite is a major thing. Therefore I suggest the
> next release of rdiff-backup would bump the major version number and
> become 2.0.0 (or even 3.0.0 to tribute Python 3).
> 
> What do you think?
> 
> - Otto
> 
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