kilo/vendor/sigs.k8s.io/controller-tools/pkg/crd/conv.go

123 lines
4.6 KiB
Go
Raw Normal View History

package crd
import (
"fmt"
apiextinternal "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
apiext "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
apiextv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
"k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
)
var (
conversionScheme = runtime.NewScheme()
)
func init() {
if err := apiextinternal.AddToScheme(conversionScheme); err != nil {
panic("must be able to add internal apiextensions to the CRD conversion Scheme")
}
if err := apiext.AddToScheme(conversionScheme); err != nil {
panic("must be able to add apiextensions/v1 to the CRD conversion Scheme")
}
if err := apiextv1beta1.AddToScheme(conversionScheme); err != nil {
panic("must be able to add apiextensions/v1beta1 to the CRD conversion Scheme")
}
}
// AsVersion converts a CRD from the canonical internal form (currently v1) to some external form.
func AsVersion(original apiext.CustomResourceDefinition, gv schema.GroupVersion) (runtime.Object, error) {
// We can use the internal versions an existing conversions from kubernetes, since they're not in k/k itself.
// This punts the problem of conversion down the road for a future maintainer (or future instance of @directxman12)
// when we have to support older versions that get removed, or when API machinery decides to yell at us for this
// questionable decision.
intVer, err := conversionScheme.ConvertToVersion(&original, apiextinternal.SchemeGroupVersion)
if err != nil {
return nil, fmt.Errorf("unable to convert to internal CRD version: %w", err)
}
return conversionScheme.ConvertToVersion(intVer, gv)
}
// mergeIdenticalSubresources checks to see if subresources are identical across
// all versions, and if so, merges them into a top-level version.
//
// This assumes you're not using trivial versions.
func mergeIdenticalSubresources(crd *apiextv1beta1.CustomResourceDefinition) {
subres := crd.Spec.Versions[0].Subresources
for _, ver := range crd.Spec.Versions {
if ver.Subresources == nil || !equality.Semantic.DeepEqual(subres, ver.Subresources) {
// either all nil, or not identical
return
}
}
// things are identical if we've gotten this far, so move the subresources up
// and discard the identical per-version ones
crd.Spec.Subresources = subres
for i := range crd.Spec.Versions {
crd.Spec.Versions[i].Subresources = nil
}
}
// mergeIdenticalSchemata checks to see if schemata are identical across
// all versions, and if so, merges them into a top-level version.
//
// This assumes you're not using trivial versions.
func mergeIdenticalSchemata(crd *apiextv1beta1.CustomResourceDefinition) {
schema := crd.Spec.Versions[0].Schema
for _, ver := range crd.Spec.Versions {
if ver.Schema == nil || !equality.Semantic.DeepEqual(schema, ver.Schema) {
// either all nil, or not identical
return
}
}
// things are identical if we've gotten this far, so move the schemata up
// to a single schema and discard the identical per-version ones
crd.Spec.Validation = schema
for i := range crd.Spec.Versions {
crd.Spec.Versions[i].Schema = nil
}
}
// mergeIdenticalPrinterColumns checks to see if schemata are identical across
// all versions, and if so, merges them into a top-level version.
//
// This assumes you're not using trivial versions.
func mergeIdenticalPrinterColumns(crd *apiextv1beta1.CustomResourceDefinition) {
cols := crd.Spec.Versions[0].AdditionalPrinterColumns
for _, ver := range crd.Spec.Versions {
if len(ver.AdditionalPrinterColumns) == 0 || !equality.Semantic.DeepEqual(cols, ver.AdditionalPrinterColumns) {
// either all nil, or not identical
return
}
}
// things are identical if we've gotten this far, so move the printer columns up
// and discard the identical per-version ones
crd.Spec.AdditionalPrinterColumns = cols
for i := range crd.Spec.Versions {
crd.Spec.Versions[i].AdditionalPrinterColumns = nil
}
}
// MergeIdenticalVersionInfo makes sure that components of the Versions field that are identical
// across all versions get merged into the top-level fields in v1beta1.
//
// This is required by the Kubernetes API server validation.
//
// The reason is that a v1beta1 -> v1 -> v1beta1 conversion cycle would need to
// round-trip identically, v1 doesn't have top-level subresources, and without
// this restriction it would be ambiguous how a v1-with-identical-subresources
// converts into a v1beta1).
func MergeIdenticalVersionInfo(crd *apiextv1beta1.CustomResourceDefinition) {
if len(crd.Spec.Versions) > 0 {
mergeIdenticalSubresources(crd)
mergeIdenticalSchemata(crd)
mergeIdenticalPrinterColumns(crd)
}
}