Mailinglist Archive: zypp-devel (75 mails)

[Josef Reidinger <jreidinger@xxxxxxx>]

Gerard Farràs i Ballabriga wrote:
> Hello, good afternoon :-)
>
> There are some new ideas and changes about implementation details of
> the concept of failover [1].
>
> Before, our idea was to modify MediaCurl class [2] to parse a list of
> mirrors like this [3].
>
> But now, new idea is to use only metalink files ([4] [5]) and don't
> use anymore this type of mirror lists.
>
> Libzypp could download files using an external program (ej. aria2c
> [6]) to avoid having to implement all the logic from zero.
>
> Why this change?
>
>  - Because we think than we are reinventing the wheel in things like:
>
>                 * Parse HTTP codes and act according to these.
>                 * To choose the fastest mirror.
>
> How to implement?
>
>  I think we can do the implementation with some changes:
>
>         - Modify media/MediaAccess.cc [7] and check if there are available
> tools like aria2c in the target system.
>         - If we get a negative response we must use MediaCurl (like now).
>         - If we get a positive response we can use a "new" class called
> MediaArise (or something like this) which uses aria2c to download
> files using Medialink from network.
>
> What do you think about this idea? Any comments for this
> implementation? Dr. Poeml, please, feel free to correct me if there
> are any error.

I look at aria2 and you need find way how report progress from aria to 
libzypp.
Libcurl takes function from libzypp and silent its own progress 
(MediaCurl 633-642). But external program need some parsing output, 
which can have problem if aria change its output.
Look to RpmDb.cc when libzypp parse output of rpm external program.
Josef

> Obviously, any suggestion or comment will be more than welcome :-).
>
> Thanks :-)
>
> Gerard
>
> [1] http://en.opensuse.org/Libzypp/Failover
> [2] http://svn.opensuse.org/svn/zypp/trunk/libzypp/zypp/media/MediaCurl.h
> [3] 
> http://download.opensuse.org/distribution/10.3/repo/oss/suse/repodata/primary.xml.gz?mirrorlist
> [4] http://www.metalinker.org/
> [5] 
> http://download.opensuse.org/distribution/10.3/repo/oss/suse/repodata/primary.xml.gz.metalink
> [6] http://aria2.sourceforge.net/
> [7] http://svn.opensuse.org/svn/zypp/trunk/libzypp/zypp/media/MediaAccess.cc

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