Re: [Duplicity-talk] support xz compression

[Radim Tobolka]

Ok, after studying code in more detail, given short options are 
deprecated, it doesn't make much sense implementing them for new 
features like xz.

Could you people advice on some more points please?

- Should the compression settings apply to local cache too? Right now, 
sigtars are always gzipped, even with --no-compression option.
- Why are local manifests stored uncompressed?
- What is the purpose of top_off function in gpg.GpGWriteFile and why it 
is not implemented in GzipWriteFile as well? Seems to me, that when 
performing backup over network, it is more desirable not to top off the 
volumes.
- Why aren't remote manifests compressed when using --no-encryption option?
- Does anybody have experience with lz4 or lzo Python packages? I think 
it would be useful to have one of those super fast so-so compression 
schemes available, but I'm reluctant to introducing additional 
dependency from source I don't know...

Cheers,

Radim