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helm-v1beta1.go
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helm-v1beta1.go
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package apparchive
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"github.com/pkg/errors"
"github.com/replicatedhq/kots/pkg/k8sutil"
"github.com/replicatedhq/kots/pkg/util"
kustomizetypes "sigs.k8s.io/kustomize/api/types"
)
var (
goTemplateRegex *regexp.Regexp
)
func init() {
goTemplateRegex = regexp.MustCompile(`({{)|(}})`)
}
func GetRenderedV1Beta1ChartsArchive(versionArchive string, downstreamName, kustomizeBinPath string) ([]byte, map[string][]byte, error) {
renderedChartsDir := filepath.Join(versionArchive, "rendered", downstreamName, "charts")
if _, err := os.Stat(renderedChartsDir); err == nil {
// charts are already rendered, so we can just tar.gz them up
filesMap, err := util.GetFilesMap(renderedChartsDir)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to get files map")
}
archive, err := util.TGZArchive(renderedChartsDir)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to create tar.gz")
}
return archive, filesMap, nil
}
// older kots versions did not include the rendered charts in the app archive, so we have to render them
baseDir := filepath.Join(versionArchive, "base")
overlaysDir := filepath.Join(versionArchive, "overlays")
chartsDir := filepath.Join(baseDir, "charts")
if err := cleanBaseApp(chartsDir, nil); err != nil {
return nil, nil, errors.Wrap(err, "failed to clean base app")
}
archive, filesMap, err := RenderChartsArchive(baseDir, overlaysDir, downstreamName, kustomizeBinPath)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to render charts archive")
}
return archive, filesMap, nil
}
func RenderChartsArchive(baseDir string, overlaysDir string, downstreamName string, kustomizeBinPath string) ([]byte, map[string][]byte, error) {
archiveChartsDir := filepath.Join(overlaysDir, "downstreams", downstreamName, "charts")
_, err := os.Stat(archiveChartsDir)
if err != nil {
if os.IsNotExist(err) {
return nil, nil, nil
}
return nil, nil, errors.Wrap(err, "failed to stat charts directory")
}
exportChartPath, err := ioutil.TempDir("", "kotsadm")
if err != nil {
return nil, nil, errors.Wrap(err, "failed to create temp dir")
}
defer os.RemoveAll(exportChartPath)
destChartsDir := filepath.Join(exportChartPath, "charts")
if _, err := os.Stat(destChartsDir); os.IsNotExist(err) {
if err := os.MkdirAll(destChartsDir, 0755); err != nil {
return nil, nil, errors.Wrap(err, "failed to mkdir for archive chart")
}
}
renderedFilesMap := map[string][]byte{}
sourceChartsDir := filepath.Join(baseDir, "charts")
metadataFiles := []string{"Chart.yaml", "Chart.lock"}
err = filepath.Walk(archiveChartsDir,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
relPath, err := filepath.Rel(archiveChartsDir, filepath.Dir(path))
if err != nil {
return errors.Wrapf(err, "failed to get %s relative path to %s", path, archiveChartsDir)
}
for _, filename := range metadataFiles {
content, err := os.ReadFile(filepath.Join(sourceChartsDir, relPath, filename))
if err != nil {
if os.IsNotExist(err) {
continue
}
return errors.Wrapf(err, "failed to read file %s", filename)
}
if err := writeHelmFile(destChartsDir, relPath, filename, content, renderedFilesMap); err != nil {
return errors.Wrapf(err, "failed to export file %s", filename)
}
}
if info.Name() != "kustomization.yaml" {
return nil
}
srcPath := filepath.Join(sourceChartsDir, relPath)
_, err = os.Stat(srcPath)
if err != nil && !os.IsNotExist(err) {
return errors.Wrapf(err, "failed to os stat file %s", srcPath)
}
if os.IsNotExist(err) {
return nil // source chart does not exist in base
}
baseKustomization, err := k8sutil.ReadKustomizationFromFile(filepath.Join(srcPath, "kustomization.yaml"))
if err != nil {
return errors.Wrap(err, "failed to read base kustomization")
}
if err := baseKustomization.CheckEmpty(); err != nil {
baseKustomization.MetaData = &kustomizetypes.ObjectMeta{
Annotations: map[string]string{
"kots.io/kustomization": "base",
},
}
if err := k8sutil.WriteKustomizationToFile(*baseKustomization, filepath.Join(srcPath, "kustomization.yaml")); err != nil {
return errors.Wrap(err, "failed to write base kustomization")
}
}
archiveChartOutput, err := exec.Command(kustomizeBinPath, "build", filepath.Dir(path)).Output()
if err != nil {
if ee, ok := err.(*exec.ExitError); ok {
err = fmt.Errorf("kustomize %s: %q", path, string(ee.Stderr))
}
return errors.Wrapf(err, "failed to kustomize %s", path)
}
archiveFiles, err := util.SplitYAML(archiveChartOutput)
if err != nil {
return errors.Wrapf(err, "failed to split yaml result for %s", path)
}
for filename, content := range archiveFiles {
destRelPath := relPath
if filepath.Base(destRelPath) != "crds" {
destRelPath = filepath.Join(destRelPath, "templates")
content = escapeGoTemplates(content)
}
if err := writeHelmFile(destChartsDir, destRelPath, filename, content, renderedFilesMap); err != nil {
return errors.Wrapf(err, "failed to write file %s", filename)
}
}
return nil
})
if err != nil {
return nil, nil, errors.Wrap(err, "failed to walk charts directory")
}
archive, err := util.TGZArchive(destChartsDir)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to create tar.gz")
}
return archive, renderedFilesMap, nil
}
func writeHelmFile(dstRootDir string, relPath string, filename string, content []byte, renderedFilesMap map[string][]byte) error {
dstDir := filepath.Join(dstRootDir, relPath)
if err := os.MkdirAll(dstDir, 0755); err != nil {
return errors.Wrap(err, "failed to create destination dir")
}
destFilePath := filepath.Join(dstDir, filename)
if err := ioutil.WriteFile(destFilePath, content, 0644); err != nil {
return errors.Wrap(err, "failed to write file")
}
renderedFilesMap[filepath.Join(relPath, filename)] = content
return nil
}
// When saving templated file back into a chart, we need to escape Go templates so second Helm pass would ignore them.
// These are application templates that maybe used in application config files and Helm should ignore them.
// For example, original chart has this:
//
// "legendFormat": "{{`{{`}} value {{`}}`}}",
//
// Rendered chart becomes:
//
// "legendFormat": "{{ value }}",
//
// Repackaged chart should have this:
//
// "legendFormat": "{{`{{`}} value {{`}}`}}",
func escapeGoTemplates(content []byte) []byte {
replace := func(in []byte) []byte {
if string(in) == "{{" {
return []byte("{{`{{`}}")
}
if string(in) == "}}" {
return []byte("{{`}}`}}")
}
return in
}
return goTemplateRegex.ReplaceAllFunc(content, replace)
}