I couldn't have explained better than Karsten - so just ACK.
On Mon, Mar 02, 2015 at 02:30:50PM +0100, Karsten Hilbert wrote:
> On Mon, Mar 02, 2015 at 02:11:05PM +0100, Sébastien Jodogne wrote:
> > > Again, Debian strictly recommends against modifying files of
> > > other packages. However, this might be solved by a (really
> > > small) package orthanc-sqlite which CONFLICTS: with
> > > orthanc-postgresql, both of which providing orthanc-backend
> > > and both providing /etc/init.d/orthanc.init as appropriate.
> > >
> > > Orthanc itself would then depend on orthanc-backend (which is
> > > satisfied by both -sqlite and -postgresql).
> > OK, got it!
> > Andreas, if you don't mind, I will therefore modify the "orthanc" package in the following way:
> > - All the content of the current "orthanc" package (notably the main binary "/usr/sbin/Orthanc") will be moved to some new package "orthanc-backend",
> > - "orthanc" will only provide "/etc/init.d/orthanc",
> > - "orthanc" will depend on "orthanc-backend".
> > The newly added "orthanc-postgresql" package will:
> > - depend on "orthanc-backend",
> > - conflict on "orthanc", and
> > - provide an alternate version of "/etc/init.d/orthanc" with postgresql in Required-Start and Required-Stop.
> While, technically, this should work it does sound a bit
> backwards to me.
> I would provide the following packages:
> main binary and general infrastructure
> all the non-backend stuff
> nearly empty package (?)
> only providing orthanc.init without postgresql
> perhaps providing backup/restore scripts for sqlite DB ?
> Conflicts: orthanc-postgresql
> providing orthanc.init with postgresql
> providing PG backend plugin
> Conflicts: orthanc-sqlite
> Package orthanc could either Depends: on "orthanc-sqlite |
> orthanc-postgresql" in which case either of which would
> satisfy the dependency. If either is pre-installed or
> co-installed in this invocation of apt-get the other wouldn't
> get installed. Both cannot be co-installed at the same time
> due to the conflict. One _must_ be installed due to the
> Alternatively, both -sqlite and -postgresql could Provides: a
> (virtual) package "orthanc-backend" which does not contain
> anything and doesn't really exist either. Orthanc itself
> would then only depend on orthanc-backend (and not both of
> -sqlite and -postgresql explicitely). That way, it is a lot
> easier to add another backend: Just upload orthanc-oracle
> which also Provides: orthanc-backend ... The drawback is
> that you cannot "force" a "preference" (which is possible by
> the order of ORed alternatives in "orthanc-sqlite |
> Pick your poison ...
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