[Yum-devel] Plugin interface to add yumvars? [SOLVED]

[Michael E Brown]

On Tue, Mar 20, 2007 at 08:26:20AM +0200, Panu Matilainen wrote:
> On Mon, 19 Mar 2007, Michael E Brown wrote:
> 
> >On Mon, Mar 19, 2007 at 05:44:42PM -0400, seth vidal wrote:
> >>On Mon, 2007-03-19 at 09:48 -0500, Michael E Brown wrote:
> >>>I would like to write a plugin to be able to add vars to the 'yumvars' 
> >>>hash. I
> >>>would like to have a yum repo like this:
> >>>
> >>>    [dell-machinespecific]
> >>>    baseurl=http://linux.dell.com/repo/machine_specific/system-$dellsystemid
> >>>
> >>>But the problem I see is that there is no place where the plugins get 
> >>>called
> >>>between where yumvars is set (readMainConfig()) and where it is used
> >>>(getReposFromConfig()):
> >>>
> >>>    --> yum/__init__.py  doConfigSetup():
> >>>    ======================================
> >>>    self.conf = config.readMainConfig(startupconf)
> >>>    self.yumvar = self.conf.yumvar
> >>>    self.getReposFromConfig()
> >>>
> >>>The only way I can see to do this is really ugly. Any suggestions?

Ok, after much digging, it looks like I dont actually need the hook I
thought I did. :)

The yumvars are not used early, as I had thought. They are not used
until baseurlSetup() in yumRepo.py. This function is called from
repo.enable() and repo.setup() which are called from doRepoSetup(). This
means I can add the conf.yumvar[] I want, then
repo.yumvar.update(conf.yumvar) and everything works out just fine.

This appears to work (prototype only):

=========================================
def init_hook(conduit):
    conf = conduit.getConf()
    conf.yumvar["dellsysid"] = "MAGIC"

    repos = conduit.getRepos()
    for repo in repos.findRepos('*'):
        repo.yumvar.update(conf.yumvar)
=========================================

I have code to get the dell system id which I will plug in. Then the
only thing I have left to do is automatically disable the repo if the
repo doesnt exist (ie. no repo for that sys id).

--
Michael