mirror of https://github.com/k3s-io/k3s
140 lines
4.0 KiB
Go
140 lines
4.0 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package config
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"sigs.k8s.io/kustomize/pkg/gvk"
|
|
)
|
|
|
|
// FieldSpec completely specifies a kustomizable field in
|
|
// an unstructured representation of a k8s API object.
|
|
// It helps define the operands of transformations.
|
|
//
|
|
// For example, a directive to add a common label to objects
|
|
// will need to know that a 'Deployment' object (in API group
|
|
// 'apps', any version) can have labels at field path
|
|
// 'spec/template/metadata/labels', and further that it is OK
|
|
// (or not OK) to add that field path to the object if the
|
|
// field path doesn't exist already.
|
|
//
|
|
// This would look like
|
|
// {
|
|
// group: apps
|
|
// kind: Deployment
|
|
// path: spec/template/metadata/labels
|
|
// create: true
|
|
// }
|
|
type FieldSpec struct {
|
|
gvk.Gvk `json:",inline,omitempty" yaml:",inline,omitempty"`
|
|
Path string `json:"path,omitempty" yaml:"path,omitempty"`
|
|
CreateIfNotPresent bool `json:"create,omitempty" yaml:"create,omitempty"`
|
|
}
|
|
|
|
const (
|
|
escapedForwardSlash = "\\/"
|
|
tempSlashReplacement = "???"
|
|
)
|
|
|
|
func (fs FieldSpec) String() string {
|
|
return fmt.Sprintf(
|
|
"%s:%v:%s", fs.Gvk.String(), fs.CreateIfNotPresent, fs.Path)
|
|
}
|
|
|
|
// If true, the primary key is the same, but other fields might not be.
|
|
func (fs FieldSpec) effectivelyEquals(other FieldSpec) bool {
|
|
return fs.IsSelected(&other.Gvk) && fs.Path == other.Path
|
|
}
|
|
|
|
// PathSlice converts the path string to a slice of strings,
|
|
// separated by a '/'. Forward slash can be contained in a
|
|
// fieldname. such as ingress.kubernetes.io/auth-secret in
|
|
// Ingress annotations. To deal with this special case, the
|
|
// path to this field should be formatted as
|
|
//
|
|
// metadata/annotations/ingress.kubernetes.io\/auth-secret
|
|
//
|
|
// Then PathSlice will return
|
|
//
|
|
// []string{
|
|
// "metadata",
|
|
// "annotations",
|
|
// "ingress.auth-secretkubernetes.io/auth-secret"
|
|
// }
|
|
func (fs FieldSpec) PathSlice() []string {
|
|
if !strings.Contains(fs.Path, escapedForwardSlash) {
|
|
return strings.Split(fs.Path, "/")
|
|
}
|
|
s := strings.Replace(fs.Path, escapedForwardSlash, tempSlashReplacement, -1)
|
|
paths := strings.Split(s, "/")
|
|
var result []string
|
|
for _, path := range paths {
|
|
result = append(result, strings.Replace(path, tempSlashReplacement, "/", -1))
|
|
}
|
|
return result
|
|
}
|
|
|
|
type fsSlice []FieldSpec
|
|
|
|
func (s fsSlice) Len() int { return len(s) }
|
|
func (s fsSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
|
func (s fsSlice) Less(i, j int) bool {
|
|
return s[i].Gvk.IsLessThan(s[j].Gvk)
|
|
}
|
|
|
|
// mergeAll merges the argument into this, returning the result.
|
|
// Items already present are ignored.
|
|
// Items that conflict (primary key matches, but remain data differs)
|
|
// result in an error.
|
|
func (s fsSlice) mergeAll(incoming fsSlice) (result fsSlice, err error) {
|
|
result = s
|
|
for _, x := range incoming {
|
|
result, err = result.mergeOne(x)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return result, nil
|
|
}
|
|
|
|
// mergeOne merges the argument into this, returning the result.
|
|
// If the item's primary key is already present, and there are no
|
|
// conflicts, it is ignored (we don't want duplicates).
|
|
// If there is a conflict, the merge fails.
|
|
func (s fsSlice) mergeOne(x FieldSpec) (fsSlice, error) {
|
|
i := s.index(x)
|
|
if i > -1 {
|
|
// It's already there.
|
|
if s[i].CreateIfNotPresent != x.CreateIfNotPresent {
|
|
return nil, fmt.Errorf("conflicting fieldspecs")
|
|
}
|
|
return s, nil
|
|
}
|
|
return append(s, x), nil
|
|
}
|
|
|
|
func (s fsSlice) index(fs FieldSpec) int {
|
|
for i, x := range s {
|
|
if x.effectivelyEquals(fs) {
|
|
return i
|
|
}
|
|
}
|
|
return -1
|
|
}
|