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template.go
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template.go
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/*
Copyright 2016 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"errors"
"fmt"
"io"
"os"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/Masterminds/semver"
"github.com/spf13/cobra"
"k8s.io/helm/pkg/chartutil"
"k8s.io/helm/pkg/engine"
"k8s.io/helm/pkg/helm"
"k8s.io/helm/pkg/proto/hapi/chart"
"k8s.io/helm/pkg/proto/hapi/release"
util "k8s.io/helm/pkg/releaseutil"
"k8s.io/helm/pkg/tiller"
"k8s.io/helm/pkg/timeconv"
tversion "k8s.io/helm/pkg/version"
)
const templateDesc = `
Render chart templates locally and display the output.
This does not require Tiller. However, any values that would normally be
looked up or retrieved in-cluster will be faked locally. Additionally, none
of the server-side testing of chart validity (e.g. whether an API is supported)
is done.
To render just one template in a chart, use '-x':
$ helm template mychart -x templates/deployment.yaml
`
type templateCmd struct {
namespace string
valueFiles valueFiles
chartPath string
out io.Writer
client helm.Interface
values []string
nameTemplate string
showNotes bool
releaseName string
renderFiles []string
kubeVersion string
}
func newTemplateCmd(out io.Writer) *cobra.Command {
t := &templateCmd{
out: out,
}
cmd := &cobra.Command{
Use: "template [flags] CHART",
Short: fmt.Sprintf("locally render templates"),
Long: templateDesc,
RunE: t.run,
}
f := cmd.Flags()
f.BoolVar(&t.showNotes, "notes", false, "show the computed NOTES.txt file as well")
f.StringVarP(&t.releaseName, "name", "n", "RELEASE-NAME", "release name")
f.StringArrayVarP(&t.renderFiles, "execute", "x", []string{}, "only execute the given templates")
f.VarP(&t.valueFiles, "values", "f", "specify values in a YAML file (can specify multiple)")
f.StringVar(&t.namespace, "namespace", "", "namespace to install the release into")
f.StringArrayVar(&t.values, "set", []string{}, "set values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)")
f.StringVar(&t.nameTemplate, "name-template", "", "specify template used to name the release")
f.StringVar(&t.kubeVersion, "kube-version", "", "override the Kubernetes version used as Capabilities.KubeVersion.Major/Minor (e.g. 1.7)")
return cmd
}
func (t *templateCmd) run(cmd *cobra.Command, args []string) error {
if len(args) < 1 {
return errors.New("chart is required")
}
// verify chart path exists
if _, err := os.Stat(args[0]); err == nil {
if t.chartPath, err = filepath.Abs(args[0]); err != nil {
return err
}
} else {
return err
}
// verify specified templates exist relative to chart
rf := []string{}
var af string
var err error
if len(t.renderFiles) > 0 {
for _, f := range t.renderFiles {
if !filepath.IsAbs(f) {
af, err = filepath.Abs(t.chartPath + "/" + f)
if err != nil {
return fmt.Errorf("could not resolve template path: %s", err)
}
} else {
af = f
}
rf = append(rf, af)
if _, err := os.Stat(af); err != nil {
return fmt.Errorf("could not resolve template path: %s", err)
}
}
}
if t.namespace == "" {
t.namespace = defaultNamespace()
}
// get combined values and create config
rawVals, err := vals(t.valueFiles, t.values)
if err != nil {
return err
}
config := &chart.Config{Raw: string(rawVals), Values: map[string]*chart.Value{}}
// If template is specified, try to run the template.
if t.nameTemplate != "" {
t.releaseName, err = generateName(t.nameTemplate)
if err != nil {
return err
}
}
// Check chart requirements to make sure all dependencies are present in /charts
c, err := chartutil.Load(t.chartPath)
if err != nil {
return prettyError(err)
}
if req, err := chartutil.LoadRequirements(c); err == nil {
if err := checkDependencies(c, req); err != nil {
return prettyError(err)
}
} else if err != chartutil.ErrRequirementsNotFound {
return fmt.Errorf("cannot load requirements: %v", err)
}
options := chartutil.ReleaseOptions{
Name: t.releaseName,
Time: timeconv.Now(),
Namespace: t.namespace,
}
err = chartutil.ProcessRequirementsEnabled(c, config)
if err != nil {
return err
}
err = chartutil.ProcessRequirementsImportValues(c)
if err != nil {
return err
}
// Set up engine.
renderer := engine.New()
caps := &chartutil.Capabilities{
APIVersions: chartutil.DefaultVersionSet,
KubeVersion: chartutil.DefaultKubeVersion,
TillerVersion: tversion.GetVersionProto(),
}
// If --kube-versionis set, try to parse it as SemVer, and override the
// kubernetes version
if t.kubeVersion != "" {
kv, err := semver.NewVersion(t.kubeVersion)
if err != nil {
return fmt.Errorf("could not parse a kubernetes version: %v", err)
}
caps.KubeVersion.Major = fmt.Sprint(kv.Major())
caps.KubeVersion.Minor = fmt.Sprint(kv.Minor())
}
vals, err := chartutil.ToRenderValuesCaps(c, config, options, caps)
if err != nil {
return err
}
out, err := renderer.Render(c, vals)
listManifests := []tiller.Manifest{}
if err != nil {
return err
}
// extract kind and name
re := regexp.MustCompile("kind:(.*)\n")
for k, v := range out {
match := re.FindStringSubmatch(v)
h := "Unknown"
if len(match) == 2 {
h = strings.TrimSpace(match[1])
}
m := tiller.Manifest{Name: k, Content: v, Head: &util.SimpleHead{Kind: h}}
listManifests = append(listManifests, m)
}
in := func(needle string, haystack []string) bool {
// make needle path absolute
d := strings.Split(needle, "/")
dd := d[1:]
an := t.chartPath + "/" + strings.Join(dd, "/")
for _, h := range haystack {
if h == an {
return true
}
}
return false
}
if settings.Debug {
rel := &release.Release{
Name: t.releaseName,
Chart: c,
Config: config,
Version: 1,
Namespace: t.namespace,
Info: &release.Info{LastDeployed: timeconv.Timestamp(time.Now())},
}
printRelease(os.Stdout, rel)
}
for _, m := range tiller.SortByKind(listManifests) {
if len(t.renderFiles) > 0 && in(m.Name, rf) == false {
continue
}
data := m.Content
b := filepath.Base(m.Name)
if !t.showNotes && b == "NOTES.txt" {
continue
}
if strings.HasPrefix(b, "_") {
continue
}
fmt.Printf("---\n# Source: %s\n", m.Name)
fmt.Println(data)
}
return nil
}