mirror of
https://github.com/kubernetes-sigs/descheduler.git
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65 lines
2.2 KiB
Go
Vendored
65 lines
2.2 KiB
Go
Vendored
/*
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Copyright 2025 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package validate
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import (
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"context"
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"k8s.io/apimachinery/pkg/api/equality"
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"k8s.io/apimachinery/pkg/api/operation"
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"k8s.io/apimachinery/pkg/util/validation/field"
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)
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// ImmutableByCompare verifies that the specified value has not changed in the
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// course of an update operation. It does nothing if the old value is not
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// provided. If the caller needs to compare types that are not trivially
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// comparable, they should use ImmutableByReflect instead.
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//
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// Caution: structs with pointer fields satisfy comparable, but this function
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// will only compare pointer values. It does not compare the pointed-to
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// values.
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func ImmutableByCompare[T comparable](_ context.Context, op operation.Operation, fldPath *field.Path, value, oldValue *T) field.ErrorList {
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if op.Type != operation.Update {
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return nil
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}
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if value == nil && oldValue == nil {
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return nil
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}
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if value == nil || oldValue == nil || *value != *oldValue {
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return field.ErrorList{
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field.Forbidden(fldPath, "field is immutable"),
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}
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}
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return nil
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}
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// ImmutableByReflect verifies that the specified value has not changed in
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// the course of an update operation. It does nothing if the old value is not
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// provided. Unlike ImmutableByCompare, this function can be used with types that are
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// not directly comparable, at the cost of performance.
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func ImmutableByReflect[T any](_ context.Context, op operation.Operation, fldPath *field.Path, value, oldValue T) field.ErrorList {
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if op.Type != operation.Update {
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return nil
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}
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if !equality.Semantic.DeepEqual(value, oldValue) {
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return field.ErrorList{
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field.Forbidden(fldPath, "field is immutable"),
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}
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}
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return nil
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}
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