Lennart Poettering
d219a2b07c
The slice a unit is assigned to is currently a UnitRef reference. Let's turn it into a proper dependency, to simplify and clean up code a bit. Now that new dep types are cheaper, deps should generally be preferable over everything else, if the concept applies. This brings one major benefit: we often have to iterate through all unit a slice contains. So far we iterated through all Before= dependencies of the slice unit to achieve that, filtering out unrelated units, and taking benefit of the fact that slice units are implicitly ordered Before= the units they contain. By making Slice= a proper dependency, and having an accompanying SliceOf= dependency type, this is much simpler and nicer as we can directly enumerate the units a slice contains. The forward dependency is actually called InSlice internally, since we already used the UNIT_SLICE name as UnitType field. However, since we don't intend to expose the dependency to users as dep anyway (we already have the regular Slice D-Bus property for this) this shouldn't matter. The SliceOf= implicit dependency type (the erverse of Slice=/InSlice=) is exported over the bus, to make things a bit nicer to debug and discoverable.
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