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chart.go
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chart.go
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package helm
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/arttor/helmify/pkg/cluster"
"github.com/arttor/helmify/pkg/helmify"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"sigs.k8s.io/yaml"
)
// NewOutput creates interface to dump processed input to filesystem in Helm chart format.
func NewOutput() helmify.Output {
return &output{}
}
type output struct{}
// Create a helm chart in the current directory:
// chartName/
// ├── .helmignore # Contains patterns to ignore when packaging Helm charts.
// ├── Chart.yaml # Information about your chart
// ├── values.yaml # The default values for your templates
// └── templates/ # The template files
// └── _helpers.tp # Helm default template partials
// Overwrites existing values.yaml and templates in templates dir on every run.
func (o output) Create(chartDir, chartName string, crd bool, templates []helmify.Template) error {
err := initChartDir(chartDir, chartName, crd)
if err != nil {
return err
}
// group templates into files
files := map[string][]helmify.Template{}
values := helmify.Values{}
values[cluster.DomainKey] = cluster.DefaultDomain
for _, template := range templates {
file := files[template.Filename()]
file = append(file, template)
files[template.Filename()] = file
err = values.Merge(template.Values())
if err != nil {
return err
}
}
cDir := filepath.Join(chartDir, chartName)
for filename, tpls := range files {
err = overwriteTemplateFile(filename, cDir, crd, tpls)
if err != nil {
return err
}
}
err = overwriteValuesFile(cDir, values)
if err != nil {
return err
}
return nil
}
func overwriteTemplateFile(filename, chartDir string, crd bool, templates []helmify.Template) error {
// pull in crd-dir setting and siphon crds into folder
var subdir string
if strings.Contains(filename, "crd") && crd {
subdir = "crds"
// create "crds" if not exists
if _, err := os.Stat(filepath.Join(chartDir, "crds")); os.IsNotExist(err) {
err = os.MkdirAll(filepath.Join(chartDir, "crds"), 0750)
if err != nil {
return errors.Wrap(err, "unable create crds dir")
}
}
} else {
subdir = "templates"
}
file := filepath.Join(chartDir, subdir, filename)
f, err := os.OpenFile(file, os.O_APPEND|os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return errors.Wrap(err, "unable to open "+file)
}
defer f.Close()
for i, t := range templates {
logrus.WithField("file", file).Debug("writing a template into")
err = t.Write(f)
if err != nil {
return errors.Wrap(err, "unable to write into "+file)
}
if i != len(templates)-1 {
_, err = f.Write([]byte("\n---\n"))
if err != nil {
return errors.Wrap(err, "unable to write into "+file)
}
}
}
logrus.WithField("file", file).Info("overwritten")
return nil
}
func overwriteValuesFile(chartDir string, values helmify.Values) error {
res, err := yaml.Marshal(values)
if err != nil {
return errors.Wrap(err, "unable to write marshal values.yaml")
}
file := filepath.Join(chartDir, "values.yaml")
err = ioutil.WriteFile(file, res, 0600)
if err != nil {
return errors.Wrap(err, "unable to write values.yaml")
}
logrus.WithField("file", file).Info("overwritten")
return nil
}