github.com/koderover/helm@v2.17.0+incompatible/pkg/renderutil/render.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 renderutil
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"github.com/Masterminds/semver"
    23  
    24  	"k8s.io/helm/pkg/chartutil"
    25  	"k8s.io/helm/pkg/engine"
    26  	"k8s.io/helm/pkg/proto/hapi/chart"
    27  	tversion "k8s.io/helm/pkg/version"
    28  )
    29  
    30  // Options are options for this simple local render
    31  type Options struct {
    32  	ReleaseOptions chartutil.ReleaseOptions
    33  	KubeVersion    string
    34  	APIVersions    []string
    35  }
    36  
    37  // Render chart templates locally and display the output.
    38  // This does not require the Tiller. 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  // Note: a `nil` config passed here means "ignore the chart's default values";
    44  // if you want the normal behavior of merging the defaults with the new config,
    45  // you should pass `&chart.Config{Raw: "{}"},
    46  func Render(c *chart.Chart, config *chart.Config, opts Options) (map[string]string, error) {
    47  	if req, err := chartutil.LoadRequirements(c); err == nil {
    48  		if err := CheckDependencies(c, req); err != nil {
    49  			return nil, err
    50  		}
    51  	} else if err != chartutil.ErrRequirementsNotFound {
    52  		return nil, fmt.Errorf("cannot load requirements: %v", err)
    53  	}
    54  
    55  	err := chartutil.ProcessRequirementsEnabled(c, config)
    56  	if err != nil {
    57  		return nil, err
    58  	}
    59  	err = chartutil.ProcessRequirementsImportValues(c)
    60  	if err != nil {
    61  		return nil, err
    62  	}
    63  
    64  	// Set up engine.
    65  	renderer := engine.New()
    66  
    67  	caps := &chartutil.Capabilities{
    68  		APIVersions:   chartutil.DefaultVersionSet,
    69  		KubeVersion:   chartutil.DefaultKubeVersion,
    70  		TillerVersion: tversion.GetVersionProto(),
    71  	}
    72  
    73  	if opts.KubeVersion != "" {
    74  		kv, verErr := semver.NewVersion(opts.KubeVersion)
    75  		if verErr != nil {
    76  			return nil, fmt.Errorf("could not parse a kubernetes version: %v", verErr)
    77  		}
    78  		caps.KubeVersion.Major = fmt.Sprint(kv.Major())
    79  		caps.KubeVersion.Minor = fmt.Sprint(kv.Minor())
    80  		caps.KubeVersion.GitVersion = fmt.Sprintf("v%d.%d.0", kv.Major(), kv.Minor())
    81  	}
    82  
    83  	if len(opts.APIVersions) > 0 {
    84  		caps.APIVersions = chartutil.NewVersionSet(append(opts.APIVersions, "v1")...)
    85  	}
    86  
    87  	vals, err := chartutil.ToRenderValuesCaps(c, config, opts.ReleaseOptions, caps)
    88  	if err != nil {
    89  		return nil, err
    90  	}
    91  
    92  	return renderer.Render(c, vals)
    93  }