Previously we refused to emit 'autoConvert_*' functions if any field was not
convertible. The way around this was to write manual Conversion functions, but
to do so safely you must handle every fields. Huge opportunity for errors.
This PR cleans up the filtering such that it only operates on types that should
be converted (remove a lot of code) and tracks when fields are skipped. In
that case, it emits an 'autoConvert' function but not a public 'Convert'
function. If there is no manual function, the compile will fail.
This also means that manual conversion functions can call autoConvert functions
and then "patch up" what they need.
This fixes PodSpec to generate cleanly. No other types only half-generate (so
now we Fatalf), though several fail to generate at all (only Errorf for now).
There are ample opportunities to optimize and streamline here. For example,
there's no reason to have a function to convert IntStr to IntStr. Removing the
function does generate the right assignment, but it is unclear whether the
registered function is needed or not. I opted to leave it alone for now.
Another example is Convert_Slice_byte_To_Slice_byte, which just seems silly.
This drives conversion generation from file tags like:
// +conversion-gen=k8s.io/my/internal/version
.. rather than hardcoded lists of packages.
The only net change in generated code can be explained as correct. Previously
it didn't know that conversion was available.
This means that tags like:
// +foo=bar
// +foo=bat
..will produce []string{"bar", "bat"}. This is needed for later commits which
will want to use this to make code generation more self contained.
In bringing back Clayton's PR piece-by-piece this was almost as easy to
implement as his version, and is much more like what I think we should be
doing.
Specifically, any time which defines a .DeepCopy() method will have that method
called preferentially. Otherwise we generate our own functions for
deep-copying. This affected exactly one type - resource.Quantity. In applying
this heuristic, several places in the generated code were simplified.
To achieve this I had to convert types.Type.Methods from a slice to a map,
which seems correct anyway (to do by-name lookups).
Downstream generators that want to reuse the upstream generated types
need to be able to define a different ignore tag (so that they can see
the already generated types).
Automatic merge from submit-queue
Conversions have kube-isms and are not portable for downstream
Some minor fixes to enable generators for OpenShift and others who need
to generate conversions on Kube API groups outside the core.
@deads2k
