github.com/doitroot/helm@v3.0.0-beta.3+incompatible/pkg/cli/values/options.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 values
    18  
    19  import (
    20  	"io/ioutil"
    21  	"net/url"
    22  	"os"
    23  	"strings"
    24  
    25  	"github.com/pkg/errors"
    26  	"sigs.k8s.io/yaml"
    27  
    28  	"helm.sh/helm/pkg/getter"
    29  	"helm.sh/helm/pkg/strvals"
    30  )
    31  
    32  type Options struct {
    33  	ValueFiles   []string
    34  	StringValues []string
    35  	Values       []string
    36  }
    37  
    38  // MergeValues merges values from files specified via -f/--values and
    39  // directly via --set or --set-string, marshaling them to YAML
    40  func (opts *Options) MergeValues(p getter.Providers) (map[string]interface{}, error) {
    41  	base := map[string]interface{}{}
    42  
    43  	// User specified a values files via -f/--values
    44  	for _, filePath := range opts.ValueFiles {
    45  		currentMap := map[string]interface{}{}
    46  
    47  		bytes, err := readFile(filePath, p)
    48  		if err != nil {
    49  			return nil, err
    50  		}
    51  
    52  		if err := yaml.Unmarshal(bytes, &currentMap); err != nil {
    53  			return nil, errors.Wrapf(err, "failed to parse %s", filePath)
    54  		}
    55  		// Merge with the previous map
    56  		base = mergeMaps(base, currentMap)
    57  	}
    58  
    59  	// User specified a value via --set
    60  	for _, value := range opts.Values {
    61  		if err := strvals.ParseInto(value, base); err != nil {
    62  			return nil, errors.Wrap(err, "failed parsing --set data")
    63  		}
    64  	}
    65  
    66  	// User specified a value via --set-string
    67  	for _, value := range opts.StringValues {
    68  		if err := strvals.ParseIntoString(value, base); err != nil {
    69  			return nil, errors.Wrap(err, "failed parsing --set-string data")
    70  		}
    71  	}
    72  
    73  	return base, nil
    74  }
    75  
    76  func mergeMaps(a, b map[string]interface{}) map[string]interface{} {
    77  	out := make(map[string]interface{}, len(a))
    78  	for k, v := range a {
    79  		out[k] = v
    80  	}
    81  	for k, v := range b {
    82  		if v, ok := v.(map[string]interface{}); ok {
    83  			if bv, ok := out[k]; ok {
    84  				if bv, ok := bv.(map[string]interface{}); ok {
    85  					out[k] = mergeMaps(bv, v)
    86  					continue
    87  				}
    88  			}
    89  		}
    90  		out[k] = v
    91  	}
    92  	return out
    93  }
    94  
    95  // readFile load a file from stdin, the local directory, or a remote file with a url.
    96  func readFile(filePath string, p getter.Providers) ([]byte, error) {
    97  	if strings.TrimSpace(filePath) == "-" {
    98  		return ioutil.ReadAll(os.Stdin)
    99  	}
   100  	u, _ := url.Parse(filePath)
   101  
   102  	// FIXME: maybe someone handle other protocols like ftp.
   103  	g, err := p.ByScheme(u.Scheme)
   104  	if err != nil {
   105  		return ioutil.ReadFile(filePath)
   106  	}
   107  	data, err := g.Get(filePath, getter.WithURL(filePath))
   108  	return data.Bytes(), err
   109  }