Mailinglist Archive: zypp-devel (225 mails)

[Duncan Mac-Vicar Prett <dmacvicar@xxxxxxx>]

Gerard Farràs i Ballabriga wrote:
> 2008/4/28, Duncan Mac-Vicar Prett <dmacvicar@xxxxxxx>:
>
>   
> > May be compiling/installing libzypp from svn trunk in a prefix, then
> > compiling zypper against this libzypp.
> >     
>
> This step is "already" done  ;-) .   What next ?
>
> Thanks,
>
> Gerard
>   
http://en.opensuse.org/Libzypp/Design (needs some update but most is 
still valid)

http://en.opensuse.org/Libzypp/Programmers_Guide

then I would start looking how the different layers interact:

in the lowest level you have plain curl. This is wrapped by MediaManager 
(in media directory), which has different backends, curl is just one of 
them. Then there is MediaSetAccess on top which adds the ability to 
manage multiple media sets (CDs) and set checkers when the wrong media 
is inserted. Then there is Fetcher which allows to queue jobs, and can 
look if the requested files are already present in some local cache. 
Then there are the repo/Downloaders which are Fetcher themselves, and 
they have the specific logic on how to download one type of repository. 
Then you have RepoMediaAccess that knows more specific information about 
the repository itself, and sets the correct media verifier with the 
repository metadata media information.

The idea is that the upper layers provide most of the functionality 
using the lower ones. But the design always allow you to use low level 
pieces directly (most of the time)

Duncan
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