2010/2/5 P.J. Eby email@example.com:
At 01:55 AM 2/5/2010 +0100, Tarek Ziadé wrote:
I think it's still useful, because it points the root packages that can be removed safely without breaking the system -- even if leaving orphaned packages behind.
Any opinion ?
I think it's a good idea to have a way to tell what packages were *not* installed to satisfy dependencies.
Merely plotting the dependency graph doesn't tell you this, because you could have a non-root orphan - i.e., something that was installed to fill a dependency, but the depender(s) have now vanished.
I guess what I'm saying is, a thing that is not needed by anything else could either be an orphan (due to other uninstalls) *or* a root (manually chosen for install), and there is no way to tell them apart just by following the graph.
I am wondering *when* the depender(s) may vanish like that, leaving behind them orphaned dependencies.
I guess this can happen when:
1/ a package (*looks like we can't help it calling a distribution a package after all...*) is removed by another tool that it was installed with.
2/ something goes wrong during uninstallation
So I wonder : will 1/ really happen that often ? and shouldn't 2/ be taken care by the high-level uninstaller ?