[Yum] Yum Dependency Resolution algorithm

[Pauwel Coppieters]

Hello,

I have some trouble understanding how dependency resolution works in
yum (2.6.1).

There is on my system an old version of transcode I would like to
update. A newer version from RPMForge has a dependency on
libpostproc.so.0.0.1

>
> $ yum deplist transcode
> Finding dependencies: 
> Setting up repositories
> rpmforge                                                             
> updates-released                                                     
> base                                                                 
> extras                                                               
> Reading repository metadata in from local files
> package: transcode.i386 1.0.2-7.fc4.rf
>   dependency: libpostproc.so.0.0.1
>    Unsatisfied dependency
> 

There is no package that provides libpostproc.so.0.0.1. However a
local package is installed that provides libpostproc.so.0.0.1

> 
> $ yum whatprovides libpostproc.so.0.0.1
> Searching Packages: 
> Setting up repositories
> rpmforge                                                             
> updates-released                                                     
> base                                                                 
> extras                                                               
> Reading repository metadata in from local files
> Importing additional filelist information
> 
> 
> libpostproc.i386               1.0-0.14.pre6a.1.fc3.f
installed             
> Matched from:
> /usr/lib/libpostproc.so.0.0.1
> 

Eventually, yum fails to update transcode (see below). Is this
intended behaviour, or should this work. If so, any directions as
where to change in the source ?

Greetings

Pauwel Coppieters


> 
> # yum  update transcode
> Setting up Update Process
> Setting up repositories
> rpmforge                                                           
> updates-released                                                    
> base                                                                 
> extras                                                               
> Reading repository metadata in from local files
> Resolving Dependencies
> --> Populating transaction set with selected packages. Please wait.
> ---> Package transcode.i386 0:1.0.2-7.fc4.rf set to be updated
> --> Running transaction check
> --> Processing Dependency: libmpeg2convert.so.0 for package: transcode
> --> Processing Dependency: libpostproc.so.0.0.1 for package: transcode
> --> Processing Dependency: libmpeg2.so.0 for package: transcode
> --> Restarting Dependency Resolution with new changes.
> --> Populating transaction set with selected packages. Please wait.
> ---> Package mpeg2dec.i386 0:0.4.0-8b.fc4.rf set to be updated
> --> Running transaction check
> --> Processing Dependency: libpostproc.so.0.0.1 for package: transcode
> --> Finished Dependency Resolution
> Error: Missing Dependency: libpostproc.so.0.0.1 is needed by package
transcode
>