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kustomizer.go
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kustomizer.go
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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package krusty
import (
"fmt"
"sigs.k8s.io/kustomize/api/builtins"
"sigs.k8s.io/kustomize/api/filesys"
"sigs.k8s.io/kustomize/api/internal/k8sdeps/transformer"
pLdr "sigs.k8s.io/kustomize/api/internal/plugins/loader"
"sigs.k8s.io/kustomize/api/internal/target"
"sigs.k8s.io/kustomize/api/k8sdeps/kunstruct"
"sigs.k8s.io/kustomize/api/k8sdeps/validator"
"sigs.k8s.io/kustomize/api/konfig"
fLdr "sigs.k8s.io/kustomize/api/loader"
"sigs.k8s.io/kustomize/api/provenance"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/kustomize/api/resource"
"sigs.k8s.io/kustomize/api/types"
)
// 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 fileystem, then call Run.
type Kustomizer struct {
fSys filesys.FileSystem
options *Options
}
// MakeKustomizer returns an instance of Kustomizer.
func MakeKustomizer(fSys filesys.FileSystem, o *Options) *Kustomizer {
return &Kustomizer{fSys: fSys, options: o}
}
// Run performs a kustomization.
//
// It uses its internal filesystem reference to read the file at
// the given path argument, interpret 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 in the
// internal 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(path string) (resmap.ResMap, error) {
pf := transformer.NewFactoryImpl()
rf := resmap.NewFactory(
resource.NewFactory(
kunstruct.NewKunstructuredFactoryImpl()),
pf)
lr := fLdr.RestrictionNone
if b.options.LoadRestrictions == types.LoadRestrictionsRootOnly {
lr = fLdr.RestrictionRootOnly
}
ldr, err := fLdr.NewLoader(lr, path, b.fSys)
if err != nil {
return nil, err
}
defer ldr.Cleanup()
kt := target.NewKustTarget(
ldr,
validator.NewKustValidator(),
rf,
pf,
pLdr.NewLoader(b.options.PluginConfig, rf),
)
err = kt.Load()
if err != nil {
return nil, err
}
var m resmap.ResMap
m, err = kt.MakeCustomizedResMap()
if err != nil {
return nil, err
}
if b.options.DoLegacyResourceSort {
builtins.NewLegacyOrderTransformerPlugin().Transform(m)
}
if b.options.AddManagedbyLabel {
t := builtins.LabelTransformerPlugin{
Labels: map[string]string{konfig.ManagedbyLabelKey: fmt.Sprintf("kustomize-%s", provenance.GetProvenance().Version)},
FieldSpecs: []types.FieldSpec{{
Path: "metadata/labels",
CreateIfNotPresent: true,
}},
}
t.Transform(m)
}
return m, nil
}