Re: Need help with writing a yum plugin

On 03/25/2012 08:23 PM, Ankur Sinha wrote:
> Hello,
>
> I'm trying to write a yum plug-in: wait-for-kmod
>
> For quite a few users, the kmods from RPMFusion are a must. (Take
> broadcom wireless for example). Now, the kmods generally lag the kernel
> updates by a few hours: people who do update their systems in this
> interval are left without wireless/display etc. on reboot.
>
> We see this issue regularly in #fedora, each time a kernel update is
> pushed. The plug-in will make yum skip updating the kernel if it sees
> that the corresponding kmods are not yet available for update.
>
> I think this needs to be added in the postresolve slot, but I'm not
> adept enough at the yum API yet. I have looked at the API: I spent most
> of Saturday doing it. I think tsInfo is the way to go:
>
> - Get the currently running kernel
> - Get a list of installed kmods
> - In postresolve hook
> 	- check if the transaction set has kernel marked for update
> 	- if yes, check if all installed kmods have updates too
> 	- if all kmods aren't being updated, remove kernel from transaction
> set.
>
> Could someone please confirm if this is the way to go? I'd be grateful
> if any implementation specifics could also be given. (I was referring to
> the fedorakmod plug-in in the yum-utils, but it seems to be grossly
> outdated API wise)

Are you talking about kmod or kmdl?

Kmdl are kernel specific,
but kmods are built with weak-updates and placed in folder of the lowest 
available kernel, and then symlinked for every newly installed kernel.
I have only experience with CentOS/RHEL kernels, where there is no need 
to touch kmod packages when new kernel is installed.

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Ljubomir Ljubojevic
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PL Computers
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