Move the version-check for pruners to the pruner, which can
return a [ErrNotImplemented] error to indicate they won't
be run with the API version that's used.
This helps separating concerns, and doesn't enforce knowledge
about what's supported by each content-type onto the system
prune command.
[ErrNotImplemented]: https://pkg.go.dev/github.com/docker/docker@v28.3.3+incompatible/errdefs#ErrNotImplemented
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This adds a "dry-run" / "pre-check" option for prune-functions,
which delegates constructing the confirmation message (what is
about to be pruned) and validation of the given options to the
prune-functions.
This helps separating concerns, and doesn't enforce knowledge
about what's supported by each content-type onto the system
prune command.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Introduce a "prune" package in which we maintain a list of prune
functions that are registered. Known prune "content-types" are
included in a pre-defined order, after which additional content
can be registered.
Using this approach no longer requires the "RunPrune" functions
to be exported, and allows additional content-types to be
introduced without having to import those packages into the
system package, so keeping things more decoupled.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
