[NFS-Ganesha-Devel] Re: should we make nfs-ganesha an optional part of a ceph build?

On 17-6-2020 16:09, Jeff Layton wrote: > (I sent this to a smaller list of folks yesterday, but I think it > probably warrants wider discussion). > > Recently Varsha added the necessary infrastructure to bring up > nfs-ganesha via vstart.sh. The current implementation requires that > ganesha already be installed on the box (usually via distro packaging), > but that poses a bit of a problem. > > A distro ganesha package will have likely been built vs. a completely > different version of libcephfs and librados. Even if you build right off > of ceph master branch, you won't get the benefit of any recent client > bugfixes when you want to test ganesha. You'd have to build new ganesha > packages, install them, etc. > > I think we ought to consider making a nfs-ganesha build an optional part > of a ceph build (maybe enable it with cmake -DNFS_GANESHA=ON or > something). > > It doesn't take very long to build it (typically only a minute or two on > my box), and we could disable the parts that ceph doesn't care about > (other FSALs primarily). We could also have vstart just error out when > you run it with NFS=X on a build that didn't have ganesha enabled. > > OTOH, the potential downside here is that it'll likely add other build- > time dependencies, and would require some extra cmake or scripting > wizardry. Nothing insurmountable, but it might represent a maintenance > burden going forward, particularly for something that's basically only > going to be used for vstart. > > I'm also not sure how we'd do this in practice. I don't think you can do > optional submodules, so we might have to look at other methods of > pulling in the ganesha tree, or just live with it as a submodule that > only gets used when ganesha is enabled. To my (big)  surprise is there a FreeBSD package for nfs-ganesha so it would be perhaps a nice addon there as well. Have never looked at it, so I don't know if it plays nice with the native NFS implementation that FreeBSD brings with its kernel. And it surely will require some specific tinkering but that is a nice challenge. CMake wizardry is just a one-time obstacle, usually a not too big hurdle. I would be certainly helped by a CMake switch that turns this off, including all tests that are added to test the nfs-ganesha implementation.