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admissionplugins.go
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/
admissionplugins.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package kubernetes
import (
"fmt"
"github.com/Masterminds/semver/v3"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
)
var (
defaultPlugins = []gardencorev1beta1.AdmissionPlugin{
{Name: "Priority"},
{Name: "NamespaceLifecycle"},
{Name: "LimitRanger"},
{Name: "PodSecurity"},
{Name: "ServiceAccount"},
{Name: "NodeRestriction"},
{Name: "DefaultStorageClass"},
{Name: "DefaultTolerationSeconds"},
{Name: "ResourceQuota"},
{Name: "StorageObjectInUseProtection"},
{Name: "MutatingAdmissionWebhook"},
{Name: "ValidatingAdmissionWebhook"},
}
lowestSupportedKubernetesVersionMajorMinor = "1.25"
lowestSupportedKubernetesVersion, _ = semver.NewVersion(lowestSupportedKubernetesVersionMajorMinor)
admissionPlugins = map[string][]gardencorev1beta1.AdmissionPlugin{
"1.25": defaultPlugins,
}
)
// GetAdmissionPluginsForVersion returns the set of default admission plugins for the given Kubernetes version.
// If the given Kubernetes version does not explicitly define admission plugins the set of names for the next
// available version will be returned (e.g., for version X not defined the set of version X-1 will be returned).
func GetAdmissionPluginsForVersion(v string) []gardencorev1beta1.AdmissionPlugin {
return copyPlugins(getAdmissionPluginsForVersionInternal(v))
}
func getAdmissionPluginsForVersionInternal(v string) []gardencorev1beta1.AdmissionPlugin {
version, err := semver.NewVersion(v)
if err != nil {
return admissionPlugins[lowestSupportedKubernetesVersionMajorMinor]
}
if version.LessThan(lowestSupportedKubernetesVersion) {
return admissionPlugins[lowestSupportedKubernetesVersionMajorMinor]
}
majorMinor := formatMajorMinor(version.Major(), version.Minor())
if pluginsForVersion, ok := admissionPlugins[majorMinor]; ok {
return pluginsForVersion
}
// We do not handle decrementing the major part of the version. The reason for this is that we would have to set
// the minor part to some higher value which we don't know (assume we go from 2.2->2.1->2.0->1.?). We decided not
// to handle decrementing the major part at all, as if Gardener supports Kubernetes 2.X (independent of the fact
// that it's anyway unclear when/whether that will come) many parts have to be adapted anyway.
return GetAdmissionPluginsForVersion(formatMajorMinor(version.Major(), version.Minor()-1))
}
func formatMajorMinor(major, minor uint64) string {
return fmt.Sprintf("%d.%d", major, minor)
}
func copyPlugins(admissionPlugins []gardencorev1beta1.AdmissionPlugin) []gardencorev1beta1.AdmissionPlugin {
dst := make([]gardencorev1beta1.AdmissionPlugin, 0)
for _, plugin := range admissionPlugins {
pluginPointer := &plugin
dst = append(dst, *pluginPointer.DeepCopy())
}
return dst
}