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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package krusty
import (
"fmt"
"log"
"sigs.k8s.io/kustomize/api/internal/builtins"
fLdr "sigs.k8s.io/kustomize/api/internal/loader"
pLdr "sigs.k8s.io/kustomize/api/internal/plugins/loader"
"sigs.k8s.io/kustomize/api/internal/target"
"sigs.k8s.io/kustomize/api/internal/utils"
"sigs.k8s.io/kustomize/api/konfig"
"sigs.k8s.io/kustomize/api/provenance"
"sigs.k8s.io/kustomize/api/provider"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/kustomize/api/types"
"sigs.k8s.io/kustomize/kyaml/errors"
"sigs.k8s.io/kustomize/kyaml/filesys"
"sigs.k8s.io/kustomize/kyaml/openapi"
)
// Kustomizer performs kustomizations.
//
// It's meant to behave similarly to the kustomize CLI, and can be
// used instead of performing an exec to a kustomize CLI subprocess.
// To use, load a filesystem with kustomization files (any
// number of overlays and bases), then make a Kustomizer
// injected with the given filesystem, then call Run.
type Kustomizer struct {
options *Options
depProvider *provider.DepProvider
}
// MakeKustomizer returns an instance of Kustomizer.
func MakeKustomizer(o *Options) *Kustomizer {
return &Kustomizer{
options: o,
depProvider: provider.NewDepProvider(),
}
}
// Run performs a kustomization.
//
// It reads given path from the given file system, interprets it as
// a kustomization.yaml file, perform the kustomization it represents,
// and return the resulting resources.
//
// Any files referenced by the kustomization must be present on the
// filesystem. One may call Run any number of times, on any number
// of internal paths (e.g. the filesystem may contain multiple overlays,
// and Run can be called on each of them).
func (b *Kustomizer) Run(
fSys filesys.FileSystem, path string) (resmap.ResMap, error) {
resmapFactory := resmap.NewFactory(b.depProvider.GetResourceFactory())
lr := fLdr.RestrictionNone
if b.options.LoadRestrictions == types.LoadRestrictionsRootOnly {
lr = fLdr.RestrictionRootOnly
}
ldr, err := fLdr.NewLoader(lr, path, fSys)
if err != nil {
return nil, err
}
defer ldr.Cleanup()
kt := target.NewKustTarget(
ldr,
b.depProvider.GetFieldValidator(),
resmapFactory,
// The plugin configs are always located on disk, regardless of the fSys passed in
pLdr.NewLoader(b.options.PluginConfig, resmapFactory, filesys.MakeFsOnDisk()),
)
err = kt.Load()
if err != nil {
return nil, err
}
var bytes []byte
if openApiPath, exists := kt.Kustomization().OpenAPI["path"]; exists {
bytes, err = ldr.Load(openApiPath)
if err != nil {
return nil, err
}
}
err = openapi.SetSchema(kt.Kustomization().OpenAPI, bytes, true)
if err != nil {
return nil, err
}
var m resmap.ResMap
m, err = kt.MakeCustomizedResMap()
if err != nil {
return nil, err
}
err = b.applySortOrder(m, kt)
if err != nil {
return nil, err
}
if b.options.AddManagedbyLabel || utils.StringSliceContains(kt.Kustomization().BuildMetadata, types.ManagedByLabelOption) {
t := builtins.LabelTransformerPlugin{
Labels: map[string]string{
konfig.ManagedbyLabelKey: fmt.Sprintf("kustomize-%s", provenance.GetProvenance().Semver()),
},
FieldSpecs: []types.FieldSpec{{
Path: "metadata/labels",
CreateIfNotPresent: true,
}},
}
err = t.Transform(m)
if err != nil {
return nil, err
}
}
m.RemoveBuildAnnotations()
if !utils.StringSliceContains(kt.Kustomization().BuildMetadata, types.OriginAnnotations) {
err = m.RemoveOriginAnnotations()
if err != nil {
return nil, errors.WrapPrefixf(err, "failed to clean up origin tracking annotations")
}
}
if !utils.StringSliceContains(kt.Kustomization().BuildMetadata, types.TransformerAnnotations) {
err = m.RemoveTransformerAnnotations()
if err != nil {
return nil, errors.WrapPrefixf(err, "failed to clean up transformer annotations")
}
}
return m, nil
}
func (b *Kustomizer) applySortOrder(m resmap.ResMap, kt *target.KustTarget) error {
// Sort order can be defined in two places:
// - (new) kustomization file
// - (old) CLI flag
//
// We want the kustomization file to take precedence over the CLI flag.
// Eventually, we may want to move away from having a CLI flag altogether:
// https://github.com/kubernetes-sigs/kustomize/issues/3947
// Case 1: Sort order set in kustomization file.
if kt.Kustomization().SortOptions != nil {
// If set in CLI flag too, warn the user.
if b.options.Reorder != ReorderOptionUnspecified {
log.Println("Warning: Sorting order is set both in 'kustomization.yaml'" +
" ('sortOptions') and in a CLI flag ('--reorder'). Using the" +
" kustomization file over the CLI flag.")
}
pl := &builtins.SortOrderTransformerPlugin{
SortOptions: kt.Kustomization().SortOptions,
}
err := pl.Transform(m)
if err != nil {
return errors.Wrap(err)
}
} else if b.options.Reorder == ReorderOptionLegacy || b.options.Reorder == ReorderOptionUnspecified {
// Case 2: Sort order set in CLI flag only or not at all.
pl := &builtins.SortOrderTransformerPlugin{
SortOptions: &types.SortOptions{
Order: types.LegacySortOrder,
},
}
return errors.Wrap(pl.Transform(m))
}
return nil
}
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