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113 lines
3.1 KiB
113 lines
3.1 KiB
/*
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Copyright The Helm Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package chartutil
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/ghodss/yaml"
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"github.com/pkg/errors"
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"helm.sh/helm/pkg/chart"
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)
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// LoadChartfile loads a Chart.yaml file into a *chart.Metadata.
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func LoadChartfile(filename string) (*chart.Metadata, error) {
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b, err := ioutil.ReadFile(filename)
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if err != nil {
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return nil, err
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}
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y := new(chart.Metadata)
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err = yaml.Unmarshal(b, y)
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return y, err
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}
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// SaveChartfile saves the given metadata as a Chart.yaml file at the given path.
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//
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// 'filename' should be the complete path and filename ('foo/Chart.yaml')
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func SaveChartfile(filename string, cf *chart.Metadata) error {
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out, err := yaml.Marshal(cf)
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if err != nil {
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return err
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}
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return ioutil.WriteFile(filename, out, 0644)
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}
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// IsChartDir validate a chart directory.
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//
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// Checks for a valid Chart.yaml.
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func IsChartDir(dirName string) (bool, error) {
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if fi, err := os.Stat(dirName); err != nil {
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return false, err
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} else if !fi.IsDir() {
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return false, errors.Errorf("%q is not a directory", dirName)
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}
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chartYaml := filepath.Join(dirName, "Chart.yaml")
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if _, err := os.Stat(chartYaml); os.IsNotExist(err) {
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return false, errors.Errorf("no Chart.yaml exists in directory %q", dirName)
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}
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chartYamlContent, err := ioutil.ReadFile(chartYaml)
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if err != nil {
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return false, errors.Errorf("cannot read Chart.Yaml in directory %q", dirName)
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}
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chartContent := new(chart.Metadata)
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if err := yaml.Unmarshal(chartYamlContent, &chartContent); err != nil {
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return false, err
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}
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if chartContent == nil {
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return false, errors.New("chart metadata (Chart.yaml) missing")
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}
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if chartContent.Name == "" {
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return false, errors.New("invalid chart (Chart.yaml): name must not be empty")
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}
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return true, nil
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}
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// IsChartInstallable validates if a chart can be installed
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//
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// Application chart type is only installable
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func IsChartInstallable(chart *chart.Chart) (bool, error) {
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chartType := chart.Metadata.Type
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if strings.EqualFold(chartType, "library") {
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return false, errors.New("Library charts are not installable")
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}
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validChartType, _ := IsValidChartType(chart)
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if !validChartType {
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return false, errors.New("Invalid chart types are not installable")
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}
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return true, nil
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}
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// IsValidChartType validates the chart type
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//
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// Valid types are: application or library
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func IsValidChartType(chart *chart.Chart) (bool, error) {
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chartType := chart.Metadata.Type
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if chartType != "" && !strings.EqualFold(chartType, "library") &&
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!strings.EqualFold(chartType, "application") {
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return false, errors.New("Invalid chart type. Valid types are: application or library")
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}
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return true, nil
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}
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