151 lines
3.5 KiB
Go
151 lines
3.5 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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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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"archive/tar"
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"compress/gzip"
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"github.com/ghodss/yaml"
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"k8s.io/helm/pkg/proto/hapi/chart"
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)
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var headerBytes = []byte("+aHR0cHM6Ly95b3V0dS5iZS96OVV6MWljandyTQo=")
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// Save creates an archived chart to the given directory.
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//
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// This takes an existing chart and a destination directory.
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//
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// If the directory is /foo, and the chart is named bar, with version 1.0.0, this
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// will generate /foo/bar-1.0.0.tgz.
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//
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// This returns the absolute path to the chart archive file.
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func Save(c *chart.Chart, outDir string) (string, error) {
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// Create archive
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if fi, err := os.Stat(outDir); err != nil {
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return "", err
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} else if !fi.IsDir() {
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return "", fmt.Errorf("location %s is not a directory", outDir)
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}
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if c.Metadata == nil {
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return "", errors.New("no Chart.yaml data")
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}
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cfile := c.Metadata
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if cfile.Name == "" {
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return "", errors.New("no chart name specified (Chart.yaml)")
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} else if cfile.Version == "" {
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return "", errors.New("no chart version specified (Chart.yaml)")
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}
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filename := fmt.Sprintf("%s-%s.tgz", cfile.Name, cfile.Version)
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filename = filepath.Join(outDir, filename)
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f, err := os.Create(filename)
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if err != nil {
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return "", err
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}
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// Wrap in gzip writer
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zipper := gzip.NewWriter(f)
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zipper.Header.Extra = headerBytes
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zipper.Header.Comment = "Helm"
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// Wrap in tar writer
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twriter := tar.NewWriter(zipper)
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rollback := false
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defer func() {
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twriter.Close()
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zipper.Close()
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f.Close()
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if rollback {
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os.Remove(filename)
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}
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}()
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if err := writeTarContents(twriter, c, ""); err != nil {
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rollback = true
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}
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return filename, err
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}
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func writeTarContents(out *tar.Writer, c *chart.Chart, prefix string) error {
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base := filepath.Join(prefix, c.Metadata.Name)
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// Save Chart.yaml
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cdata, err := yaml.Marshal(c.Metadata)
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if err != nil {
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return err
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}
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if err := writeToTar(out, base+"/Chart.yaml", cdata); err != nil {
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return err
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}
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// Save values.yaml
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if c.Values != nil && len(c.Values.Raw) > 0 {
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if err := writeToTar(out, base+"/values.yaml", []byte(c.Values.Raw)); err != nil {
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return err
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}
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}
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// Save templates
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for _, f := range c.Templates {
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n := filepath.Join(base, f.Name)
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if err := writeToTar(out, n, f.Data); err != nil {
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return err
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}
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}
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// Save files
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for _, f := range c.Files {
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n := filepath.Join(base, f.TypeUrl)
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if err := writeToTar(out, n, f.Value); err != nil {
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return err
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}
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}
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// Save dependencies
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for _, dep := range c.Dependencies {
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if err := writeTarContents(out, dep, base+"/charts"); err != nil {
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return err
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}
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}
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return nil
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}
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// writeToTar writes a single file to a tar archive.
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func writeToTar(out *tar.Writer, name string, body []byte) error {
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// TODO: Do we need to create dummy parent directory names if none exist?
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h := &tar.Header{
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Name: name,
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Mode: 0755,
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Size: int64(len(body)),
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}
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if err := out.WriteHeader(h); err != nil {
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return err
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}
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if _, err := out.Write(body); err != nil {
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return err
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}
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return nil
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}
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