[Pacemaker] Re: [Cluster-devel] [RFC] Splitting cluster.git into separate projects/trees

[Steven Whitehouse]

Hi,

I'm not so keen on option #2, but aside from that I have no strong
opinions,

Steve.

On Fri, 2008-11-14 at 10:18 +0100, Fabio M. Di Nitto wrote:
> Hi everybody,
> 
> as discussed and agreed at the Cluster Summit we need to split our tree
> to make life easier in the long run (etc. etc.).
> 
> We need to decide how we want to do it and there are different
> approaches to that. I was able to think of 3. There might be more and I
> might not have taken everything into consideration so comments and ideas
> are welcome.
> 
> At this point we haven't really settled how many (sub) project will be
> created out of this split. This will come once we agree how to split.
> 
> = first approach =
> 
> We maintain cluster.git as single entity with all source code in one
> place. We change the build system in such a way each single component
> can be released standalone (similar to how it was done in the RHEL*
> branches).
> 
> Pro:
>  - preserve current development model.
>  - allow release of separate tarball for each (sub) project.
>  - external users don't need to build the whole tree for one (sub)
> project.
> 
> Cons:
>  - move all the burden to the build system (by duplicating tons of
> stuff, maybe solvable but needs investigation) and release manager.
>  - tagging for releases will require changes as it's not possible to tag
> only one (sub) project.
> 
> = second approach =
> 
> We maintain cluster.git as single entity. Each (sub) project would
> become a separate branch.
> 
> So for example all the gnbd code will be branched into master-gnbd (and
> so on for all the others).
> 
> Checking out one specific HEAD will only show the code for that project.
> 
> Pro:
>  - cleaner look at the tree.
>  - partially preserve current development model (still easy to cherry
> pick changes between branches)
>  - external users don't need to build the whole tree.
> 
> Cons:
>  - more expensive branch management.
>  - tagging for releases will require small changes.
> 
> = third approach =
> 
> We copy cluster.git N times for each (sub) project, clean the master
> branch to match only that (sub)project.
> 
> Pro:
>  - very clean tree from checkout
>  - each (sub) project is really separated and will have its own
> identity.
>  - external users don't need to build the whole tree.
>  - easier to fine tune access to each single component (for example we
> can allow user foo to access dlm but not gfs... or whatever combination)
> 
> Cons:
>  - more complex process to perform cherry-pick between branches.
>  - higher risk to commit fixes in one branch and forget in another.
>  - requires a lot more developer attention.
> 
> Fabio
>