mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-19 21:22:19 +00:00
141 lines
3.1 KiB
Go
141 lines
3.1 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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"bytes"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"sigs.k8s.io/kustomize/pkg/types"
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"strings"
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"github.com/ghodss/yaml"
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"sigs.k8s.io/kustomize/pkg/ifc"
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"sigs.k8s.io/kustomize/pkg/pgmconfig"
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"sigs.k8s.io/kustomize/pkg/resmap"
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)
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// ExecPlugin record the name and args of an executable
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// It triggers the executable generator and transformer
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type ExecPlugin struct {
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// name of the executable
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name string
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// one line of arguments for the executable
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argOneLiner string
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// relative file path to a file
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// Each line of this file is treated as one argument
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argsFromFile string
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// resmap Factory to make resources
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rf *resmap.Factory
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// loader to load files
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ldr ifc.Loader
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}
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func (p *ExecPlugin) Config(
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ldr ifc.Loader, rf *resmap.Factory, k ifc.Kunstructured) error {
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dir := filepath.Join(pgmconfig.ConfigRoot(), "plugins")
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id := k.GetGvk()
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p.name = filepath.Join(dir, id.Group, id.Version, id.Kind)
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p.rf = rf
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p.ldr = ldr
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var err error
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p.argOneLiner, err = k.GetFieldValue("arg")
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if err != nil && !isNoFieldError(err) {
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return err
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}
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p.argsFromFile, err = k.GetFieldValue("file")
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if err != nil && !isNoFieldError(err) {
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return err
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}
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return nil
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}
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func (p *ExecPlugin) Generate() (resmap.ResMap, error) {
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args, err := p.getArgs()
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if err != nil {
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return nil, err
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}
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cmd := exec.Command(p.name, args...)
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cmd.Env = os.Environ()
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cmd.Stderr = os.Stderr
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output, err := cmd.Output()
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if err != nil {
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return nil, err
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}
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return p.rf.NewResMapFromBytes(output)
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}
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func (p *ExecPlugin) Transform(rm resmap.ResMap) error {
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args, err := p.getArgs()
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if err != nil {
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return err
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}
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for id, r := range rm {
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content, err := yaml.Marshal(r.Kunstructured)
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if err != nil {
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return err
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}
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cmd := exec.Command(p.name, args...)
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cmd.Env = os.Environ()
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cmd.Stdin = bytes.NewReader(content)
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cmd.Stderr = os.Stderr
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output, err := cmd.Output()
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if err != nil {
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return err
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}
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tmpMap, err := p.rf.NewResMapFromBytes(output)
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if err != nil {
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return err
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}
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if len(tmpMap) != 1 {
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return fmt.Errorf("Unable to put two resources into one")
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}
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for _, v := range tmpMap {
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rm[id].Kunstructured = v.Kunstructured
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}
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}
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return nil
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}
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func (p *ExecPlugin) getArgs() ([]string, error) {
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args := strings.Split(p.argOneLiner, " ")
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if p.argsFromFile != "" {
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content, err := p.ldr.Load(p.argsFromFile)
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if err != nil {
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return nil, err
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}
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args = append(args, strings.Split(string(content), "\n")...)
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}
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return args, nil
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}
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func isNoFieldError(e error) bool {
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_, ok := e.(types.NoFieldError)
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if ok {
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return true
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}
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return false
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}
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