DragonFly kernel List (threaded) for 2003-10
Re: variant symlinks (was Re: Anybody working on removing sendmail from base?)
Matthew Dillon wrote:
The critical scenario for which 47 different versions of something might
be needed is if you install 200 different ports which happen to depend
on 47 different versions of, say, a patricular library.
Basically the trade-off is:
(1) Either you upgrade a port and break half the other ports that depend on
that port, which is how FreeBSD works now.
(2) You upgrade a port, making a new version available, without breaking
half the other ports that depend on the port you upgraded because those
other ports can still be allowed to depend on an older version of the
port.... which means that multiple versions of the dependant port
have to remain in the system.
Now, reasonably and obviously, one would want to also upgrade all the
dependant ports. Realistically however the process of upgrading dependant
ports to use the new version of some dependancy can take weeks or months
depending on the complexity of the ports involved.
Consider, for example, what happens when one tries to upgrade libpng.
Seems simple enough, right? But there are hundreds of ports which depend
on libpng, including openoffice. Suddenly upgrading libpng is not so
So we have a classic convenience/space tradeoff here, and I personally
far prefer the convenience of being able to upgrade my system without
breaking half my ports.
Hmm, OK, I guess it makes sense then.