[Rpm-metadata] createrepo: external locking?

[Oliver Hookins]

On Wed, Aug 25, 2010 at 05:06:49PM +0200, ext seth vidal wrote:
> > That's pretty much it. We did all of the builds initially dropping their RPMs
> > into a single repository and had frequent collisions between createrepo runs.
> 
> Then it sounds to me like you need a proper build system with dependent
> build relationships. Something like koji.

Thanks for the suggestion, I wasn't aware of koji so I'll take a look at it.

> 
> A few of other options:
> 
> 1. have each process generate their repodata in another outputdir and
> then copy the repodata over top of the path you want atomically.
> 
>  you still run the risk of there being races  there, however.
> 
> 2. have a repo per-builder and use yum to merge the repos at
> install/build time. Then each builder has their own repo they are
> controlling uniquely.
> 
> Then when the builds are finished one process can merge all of those.
> 
> 3. put a wrapper with a simple lockfile around createrepo so the other
> processes wait until it is complete before they start.
> 
> I don't see putting this code into createrepo - if only b/c it is a bit
> out of scope for createrepo, I think.

It may be a problem not worth solving, or maybe even a non-problem. Thank you
very much for your suggestions.