github.com/stefanmcshane/helm@v0.0.0-20221213002717-88a4a2c6e77d/pkg/lint/rules/values.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 rules
    18  
    19  import (
    20  	"io/ioutil"
    21  	"os"
    22  	"path/filepath"
    23  
    24  	"github.com/pkg/errors"
    25  
    26  	"github.com/stefanmcshane/helm/pkg/chartutil"
    27  	"github.com/stefanmcshane/helm/pkg/lint/support"
    28  )
    29  
    30  // Values lints a chart's values.yaml file.
    31  //
    32  // This function is deprecated and will be removed in Helm 4.
    33  func Values(linter *support.Linter) {
    34  	ValuesWithOverrides(linter, map[string]interface{}{})
    35  }
    36  
    37  // ValuesWithOverrides tests the values.yaml file.
    38  //
    39  // If a schema is present in the chart, values are tested against that. Otherwise,
    40  // they are only tested for well-formedness.
    41  //
    42  // If additional values are supplied, they are coalesced into the values in values.yaml.
    43  func ValuesWithOverrides(linter *support.Linter, values map[string]interface{}) {
    44  	file := "values.yaml"
    45  	vf := filepath.Join(linter.ChartDir, file)
    46  	fileExists := linter.RunLinterRule(support.InfoSev, file, validateValuesFileExistence(vf))
    47  
    48  	if !fileExists {
    49  		return
    50  	}
    51  
    52  	linter.RunLinterRule(support.ErrorSev, file, validateValuesFile(vf, values))
    53  }
    54  
    55  func validateValuesFileExistence(valuesPath string) error {
    56  	_, err := os.Stat(valuesPath)
    57  	if err != nil {
    58  		return errors.Errorf("file does not exist")
    59  	}
    60  	return nil
    61  }
    62  
    63  func validateValuesFile(valuesPath string, overrides map[string]interface{}) error {
    64  	values, err := chartutil.ReadValuesFile(valuesPath)
    65  	if err != nil {
    66  		return errors.Wrap(err, "unable to parse YAML")
    67  	}
    68  
    69  	// Helm 3.0.0 carried over the values linting from Helm 2.x, which only tests the top
    70  	// level values against the top-level expectations. Subchart values are not linted.
    71  	// We could change that. For now, though, we retain that strategy, and thus can
    72  	// coalesce tables (like reuse-values does) instead of doing the full chart
    73  	// CoalesceValues
    74  	coalescedValues := chartutil.CoalesceTables(make(map[string]interface{}, len(overrides)), overrides)
    75  	coalescedValues = chartutil.CoalesceTables(coalescedValues, values)
    76  
    77  	ext := filepath.Ext(valuesPath)
    78  	schemaPath := valuesPath[:len(valuesPath)-len(ext)] + ".schema.json"
    79  	schema, err := ioutil.ReadFile(schemaPath)
    80  	if len(schema) == 0 {
    81  		return nil
    82  	}
    83  	if err != nil {
    84  		return err
    85  	}
    86  	return chartutil.ValidateAgainstSingleSchema(coalescedValues, schema)
    87  }