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loader.go
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loader.go
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// Copyright © 2023 Cisco Systems, Inc. and its affiliates.
// All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package helm
import (
"errors"
"fmt"
"io/fs"
"path/filepath"
"strings"
"helm.sh/helm/v3/pkg/chart"
"helm.sh/helm/v3/pkg/chart/loader"
"github.com/openclarity/vmclarity/installation"
)
func LoadPathOrEmbedded(path string) (*chart.Chart, error) {
if path != "" {
return LoadPath(path)
}
return LoadFS(installation.HelmManifestBundle)
}
func LoadPath(path string) (*chart.Chart, error) {
chartLoader, err := loader.Loader(path)
if err != nil {
return nil, fmt.Errorf("failed to create Chart loader: %w", err)
}
loadedChart, err := chartLoader.Load()
if err != nil {
return nil, fmt.Errorf("failed to load Chart: %w", err)
}
return loadedChart, nil
}
func LoadFS(fsys fs.FS) (*chart.Chart, error) {
if fsys == nil {
return nil, errors.New("failed to load chart: invalid filesystem")
}
bufferedFiles := make([]*loader.BufferedFile, 0)
fsLoader := func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d != nil && d.IsDir() {
return nil
}
// Helm expects unix / separator, but on windows this will be \
name := strings.ReplaceAll(path, string(filepath.Separator), "/")
data, err := fs.ReadFile(fsys, path)
if err != nil {
return fmt.Errorf("failed to read file: %w", err)
}
bufferedFiles = append(bufferedFiles, &loader.BufferedFile{
Name: name,
Data: data,
})
return nil
}
err := fs.WalkDir(fsys, ".", fsLoader)
if err != nil {
return nil, fmt.Errorf("failed to load files from bundle: %w", err)
}
loadedChart, err := loader.LoadFiles(bufferedFiles)
if err != nil {
return nil, fmt.Errorf("failed to load Chart: %w", err)
}
return loadedChart, nil
}