mirror of
https://github.com/kubernetes-sigs/kustomize.git
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93 lines
2.6 KiB
Go
93 lines
2.6 KiB
Go
// Copyright 2019 The Kubernetes Authors.
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// SPDX-License-Identifier: Apache-2.0
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package types
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import (
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"fmt"
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"sigs.k8s.io/kustomize/api/resid"
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)
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// FieldSpec completely specifies a kustomizable field in
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// an unstructured representation of a k8s API object.
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// It helps define the operands of transformations.
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//
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// For example, a directive to add a common label to objects
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// will need to know that a 'Deployment' object (in API group
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// 'apps', any version) can have labels at field path
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// 'spec/template/metadata/labels', and further that it is OK
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// (or not OK) to add that field path to the object if the
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// field path doesn't exist already.
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//
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// This would look like
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// {
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// group: apps
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// kind: Deployment
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// path: spec/template/metadata/labels
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// create: true
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// }
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type FieldSpec struct {
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resid.Gvk `json:",inline,omitempty" yaml:",inline,omitempty"`
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Path string `json:"path,omitempty" yaml:"path,omitempty"`
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CreateIfNotPresent bool `json:"create,omitempty" yaml:"create,omitempty"`
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}
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func (fs FieldSpec) String() string {
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return fmt.Sprintf(
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"%s:%v:%s", fs.Gvk.String(), fs.CreateIfNotPresent, fs.Path)
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}
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// If true, the primary key is the same, but other fields might not be.
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func (fs FieldSpec) effectivelyEquals(other FieldSpec) bool {
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return fs.IsSelected(&other.Gvk) && fs.Path == other.Path
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}
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type FsSlice []FieldSpec
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func (s FsSlice) Len() int { return len(s) }
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func (s FsSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func (s FsSlice) Less(i, j int) bool {
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return s[i].Gvk.IsLessThan(s[j].Gvk)
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}
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// MergeAll merges the argument into this, returning the result.
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// Items already present are ignored.
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// Items that conflict (primary key matches, but remain data differs)
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// result in an error.
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func (s FsSlice) MergeAll(incoming FsSlice) (result FsSlice, err error) {
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result = s
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for _, x := range incoming {
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result, err = result.MergeOne(x)
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if err != nil {
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return nil, err
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}
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}
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return result, nil
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}
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// MergeOne merges the argument into this, returning the result.
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// If the item's primary key is already present, and there are no
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// conflicts, it is ignored (we don't want duplicates).
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// If there is a conflict, the merge fails.
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func (s FsSlice) MergeOne(x FieldSpec) (FsSlice, error) {
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i := s.index(x)
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if i > -1 {
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// It's already there.
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if s[i].CreateIfNotPresent != x.CreateIfNotPresent {
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return nil, fmt.Errorf("conflicting fieldspecs")
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}
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return s, nil
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}
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return append(s, x), nil
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}
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func (s FsSlice) index(fs FieldSpec) int {
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for i, x := range s {
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if x.effectivelyEquals(fs) {
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return i
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}
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}
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return -1
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}
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