81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
/*
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Copyright 2020 The Flux CD contributors.
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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 helm
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import (
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"fmt"
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"io/ioutil"
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"github.com/blang/semver"
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"helm.sh/helm/v3/pkg/repo"
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"sigs.k8s.io/yaml"
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)
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func GetDownloadableChartVersionFromIndex(path, chart, version string) (*repo.ChartVersion, error) {
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b, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, fmt.Errorf("failed to read Helm repository index file: %w", err)
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}
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index := &repo.IndexFile{}
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if err := yaml.Unmarshal(b, index); err != nil {
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return nil, fmt.Errorf("failed to unmarshal Helm repository index file: %w", err)
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}
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var cv *repo.ChartVersion
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if version == "" || version == "*" {
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cv, err = index.Get(chart, version)
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if err != nil {
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if err == repo.ErrNoChartName {
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err = fmt.Errorf("chart '%s' could not be found in Helm repository index", chart)
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}
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return nil, err
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}
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} else {
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entries, ok := index.Entries[chart]
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if !ok {
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return nil, fmt.Errorf("chart '%s' could not be found in Helm repository index", chart)
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}
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rng, err := semver.ParseRange(version)
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if err != nil {
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return nil, fmt.Errorf("semver range parse error: %w", err)
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}
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versionEntryLookup := make(map[string]*repo.ChartVersion)
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var versionsInRange []semver.Version
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for _, e := range entries {
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v, _ := semver.ParseTolerant(e.Version)
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if rng(v) {
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versionsInRange = append(versionsInRange, v)
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versionEntryLookup[v.String()] = e
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}
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}
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if len(versionsInRange) == 0 {
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return nil, fmt.Errorf("no match found for semver: %s", version)
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}
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semver.Sort(versionsInRange)
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latest := versionsInRange[len(versionsInRange)-1]
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cv = versionEntryLookup[latest.String()]
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}
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if len(cv.URLs) == 0 {
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return nil, fmt.Errorf("no downloadable URLs for chart '%s' with version '%s'", cv.Name, cv.Version)
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}
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return cv, nil
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}
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