mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-18 12:42:19 +00:00
126 lines
3.2 KiB
Go
126 lines
3.2 KiB
Go
/*
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Copyright 2019 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 plugins
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import (
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"fmt"
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"os"
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"path/filepath"
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"plugin"
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"runtime"
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"github.com/pkg/errors"
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kplugin "sigs.k8s.io/kustomize/k8sdeps/kv/plugin"
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"sigs.k8s.io/kustomize/pkg/ifc"
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"sigs.k8s.io/kustomize/pkg/resid"
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"sigs.k8s.io/kustomize/pkg/resmap"
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"sigs.k8s.io/kustomize/pkg/resource"
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"sigs.k8s.io/kustomize/pkg/transformers"
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"sigs.k8s.io/kustomize/pkg/types"
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)
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type Configurable interface {
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Config(ldr ifc.Loader, rf *resmap.Factory, k ifc.Kunstructured) error
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}
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type transformerLoader struct {
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pc *types.PluginConfig
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ldr ifc.Loader
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rf *resmap.Factory
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}
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func NewTransformerLoader(
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pc *types.PluginConfig,
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ldr ifc.Loader, rf *resmap.Factory) transformerLoader {
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return transformerLoader{pc: pc, ldr: ldr, rf: rf}
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}
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func (l transformerLoader) Load(
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rm resmap.ResMap) ([]transformers.Transformer, error) {
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if len(rm) == 0 {
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return nil, nil
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}
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if !l.pc.GoEnabled {
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return nil, fmt.Errorf("plugins not enabled")
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}
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var result []transformers.Transformer
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for id, res := range rm {
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c, err := loadAndConfigurePlugin(l.pc.DirectoryPath, id, l.ldr, l.rf, res)
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if err != nil {
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return nil, err
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}
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t, ok := c.(transformers.Transformer)
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if !ok {
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return nil, fmt.Errorf("plugin %s not a transformer", id.String())
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}
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result = append(result, t)
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}
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return result, nil
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}
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func goPluginFileName(dir string, id resid.ResId) string {
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return execPluginFileName(dir, id) + ".so"
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}
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func execPluginFileName(dir string, id resid.ResId) string {
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return filepath.Join(
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dir,
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id.Gvk().Group, id.Gvk().Version, id.Gvk().Kind)
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}
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// isExecAvailable checks if an executable is available
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func isExecAvailable(name string) bool {
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f, err := os.Stat(name)
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if os.IsNotExist(err) {
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return false
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}
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return f.Mode()&0111 != 0000
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}
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func loadAndConfigurePlugin(
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dir string, id resid.ResId,
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ldr ifc.Loader,
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rf *resmap.Factory, res *resource.Resource) (Configurable, error) {
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var fileName string
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exec := execPluginFileName(dir, id)
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if isExecAvailable(exec) {
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_, f, _, _ := runtime.Caller(1)
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fileName = filepath.Join(filepath.Dir(f), "builtin", "executable.so")
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} else {
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fileName = goPluginFileName(dir, id)
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}
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goPlugin, err := plugin.Open(fileName)
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if err != nil {
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return nil, errors.Wrapf(err, "plugin %s fails to load", fileName)
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}
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symbol, err := goPlugin.Lookup(kplugin.PluginSymbol)
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if err != nil {
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return nil, errors.Wrapf(
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err, "plugin %s doesn't have symbol %s",
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fileName, kplugin.PluginSymbol)
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}
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c, ok := symbol.(Configurable)
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if !ok {
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return nil, fmt.Errorf("plugin %s not configurable", fileName)
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}
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err = c.Config(ldr, rf, res)
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if err != nil {
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return nil, errors.Wrapf(err, "plugin %s fails configuration", fileName)
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}
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return c, nil
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}
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