github.com/umeshredd/helm@v3.0.0-alpha.1+incompatible/cmd/helm/template.go (about)

     1  /*
     2  Copyright The Helm Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"fmt"
    21  	"io"
    22  	"io/ioutil"
    23  	"strings"
    24  
    25  	"github.com/spf13/cobra"
    26  
    27  	"helm.sh/helm/cmd/helm/require"
    28  	"helm.sh/helm/pkg/action"
    29  	"helm.sh/helm/pkg/chartutil"
    30  	"helm.sh/helm/pkg/kube"
    31  	"helm.sh/helm/pkg/storage"
    32  	"helm.sh/helm/pkg/storage/driver"
    33  )
    34  
    35  const templateDesc = `
    36  Render chart templates locally and display the output.
    37  
    38  This does not require Helm. However, any values that would normally be
    39  looked up or retrieved in-cluster will be faked locally. Additionally, none
    40  of the server-side testing of chart validity (e.g. whether an API is supported)
    41  is done.
    42  
    43  To render just one template in a chart, use '-x':
    44  
    45  	$ helm template foo mychart -x templates/deployment.yaml
    46  `
    47  
    48  func newTemplateCmd(out io.Writer) *cobra.Command {
    49  	customConfig := &action.Configuration{
    50  		// Add mock objects in here so it doesn't use Kube API server
    51  		Releases:     storage.Init(driver.NewMemory()),
    52  		KubeClient:   &kube.PrintingKubeClient{Out: ioutil.Discard},
    53  		Capabilities: chartutil.DefaultCapabilities,
    54  		Log: func(format string, v ...interface{}) {
    55  			fmt.Fprintf(out, format, v...)
    56  		},
    57  	}
    58  
    59  	client := action.NewInstall(customConfig)
    60  
    61  	cmd := &cobra.Command{
    62  		Use:   "template [NAME] [CHART]",
    63  		Short: fmt.Sprintf("locally render templates"),
    64  		Long:  templateDesc,
    65  		Args:  require.MinimumNArgs(1),
    66  		RunE: func(_ *cobra.Command, args []string) error {
    67  			client.DryRun = true
    68  			client.ReleaseName = "RELEASE-NAME"
    69  			client.Replace = true // Skip the name check
    70  			rel, err := runInstall(args, client, out)
    71  			if err != nil {
    72  				return err
    73  			}
    74  			fmt.Fprintln(out, strings.TrimSpace(rel.Manifest))
    75  			return nil
    76  		},
    77  	}
    78  
    79  	addInstallFlags(cmd.Flags(), client)
    80  
    81  	return cmd
    82  }