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128 lines
3.2 KiB
128 lines
3.2 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 values
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import (
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"io/ioutil"
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"net/url"
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"os"
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"strings"
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"github.com/pkg/errors"
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"sigs.k8s.io/yaml"
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"helm.sh/helm/v3/pkg/getter"
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"helm.sh/helm/v3/pkg/strvals"
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)
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type Options struct {
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ValueFiles []string
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StringValues []string
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Values []string
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FileValues []string
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}
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// MergeValues merges values from files specified via -f/--values and directly
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// via --set, --set-string, or --set-file, marshaling them to YAML
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func (opts *Options) MergeValues(p getter.Providers) (map[string]interface{}, error) {
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base := map[string]interface{}{}
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// User specified a values files via -f/--values
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for _, filePath := range opts.ValueFiles {
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currentMap := map[string]interface{}{}
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bytes, err := readFile(filePath, p)
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if err != nil {
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return nil, err
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}
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if err := yaml.Unmarshal(bytes, ¤tMap); err != nil {
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return nil, errors.Wrapf(err, "failed to parse %s", filePath)
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}
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// Merge with the previous map
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base = mergeMaps(base, currentMap)
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}
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// User specified a value via --set
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for _, value := range opts.Values {
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if err := strvals.ParseInto(value, base); err != nil {
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return nil, errors.Wrap(err, "failed parsing --set data")
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}
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}
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// User specified a value via --set-string
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for _, value := range opts.StringValues {
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if err := strvals.ParseIntoString(value, base); err != nil {
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return nil, errors.Wrap(err, "failed parsing --set-string data")
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}
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}
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// User specified a value via --set-file
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for _, value := range opts.FileValues {
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reader := func(rs []rune) (interface{}, error) {
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bytes, err := readFile(string(rs), p)
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if err != nil {
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return nil, err
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}
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return string(bytes), err
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}
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if err := strvals.ParseIntoFile(value, base, reader); err != nil {
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return nil, errors.Wrap(err, "failed parsing --set-file data")
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}
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}
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return base, nil
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}
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func mergeMaps(a, b map[string]interface{}) map[string]interface{} {
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out := make(map[string]interface{}, len(a))
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for k, v := range a {
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out[k] = v
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}
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for k, v := range b {
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if v, ok := v.(map[string]interface{}); ok {
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if bv, ok := out[k]; ok {
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if bv, ok := bv.(map[string]interface{}); ok {
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out[k] = mergeMaps(bv, v)
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continue
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}
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}
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}
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out[k] = v
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}
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return out
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}
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// readFile load a file from stdin, the local directory, or a remote file with a url.
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func readFile(filePath string, p getter.Providers) ([]byte, error) {
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if strings.TrimSpace(filePath) == "-" {
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return ioutil.ReadAll(os.Stdin)
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}
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u, _ := url.Parse(filePath)
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// FIXME: maybe someone handle other protocols like ftp.
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g, err := p.ByScheme(u.Scheme)
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if err != nil {
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return ioutil.ReadFile(filePath)
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}
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data, err := g.Get(filePath, getter.WithURL(filePath))
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if err != nil {
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return nil, err
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}
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return data.Bytes(), err
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}
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