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helm/pkg/action/package.go

185 lines
4.3 KiB

/*
Copyright The Helm Authors.
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 action
import (
"bufio"
"fmt"
"io/ioutil"
"os"
"syscall"
"github.com/Masterminds/semver/v3"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh/terminal"
"helm.sh/helm/v3/pkg/chart"
"helm.sh/helm/v3/pkg/chart/loader"
"helm.sh/helm/v3/pkg/chartutil"
"helm.sh/helm/v3/pkg/provenance"
)
// Package is the action for packaging a chart.
//
// It provides the implementation of 'helm package'.
type Package struct {
Sign bool
Key string
Keyring string
PassphraseFile string
Version string
AppVersion string
Destination string
DependencyUpdate bool
RepositoryConfig string
RepositoryCache string
}
// NewPackage creates a new Package object with the given configuration.
func NewPackage() *Package {
return &Package{}
}
// Run executes 'helm package' against the given chart and returns the path to the packaged chart.
func (p *Package) Run(path string, vals map[string]interface{}) (string, error) {
ch, err := loader.LoadDir(path)
if err != nil {
return "", err
}
// If version is set, modify the version.
if p.Version != "" {
if err := setVersion(ch, p.Version); err != nil {
return "", err
}
}
if p.AppVersion != "" {
ch.Metadata.AppVersion = p.AppVersion
}
if reqs := ch.Metadata.Dependencies; reqs != nil {
if err := CheckDependencies(ch, reqs); err != nil {
return "", err
}
}
var dest string
if p.Destination == "." {
// Save to the current working directory.
dest, err = os.Getwd()
if err != nil {
return "", err
}
} else {
// Otherwise save to set destination
dest = p.Destination
}
name, err := chartutil.Save(ch, dest)
if err != nil {
return "", errors.Wrap(err, "failed to save")
}
if p.Sign {
err = p.Clearsign(name)
}
return name, err
}
func setVersion(ch *chart.Chart, ver string) error {
// Verify that version is a Version, and error out if it is not.
if _, err := semver.NewVersion(ver); err != nil {
return err
}
// Set the version field on the chart.
ch.Metadata.Version = ver
return nil
}
// Clearsign signs a chart
func (p *Package) Clearsign(filename string) error {
// Load keyring
signer, err := provenance.NewFromKeyring(p.Keyring, p.Key)
if err != nil {
return err
}
passphraseFetcher := promptUser
if p.PassphraseFile != "" {
passphraseFetcher, err = passphraseFileFetcher(p.PassphraseFile, os.Stdin)
if err != nil {
return err
}
}
if err := signer.DecryptKey(passphraseFetcher); err != nil {
return err
}
sig, err := signer.ClearSign(filename)
if err != nil {
return err
}
return ioutil.WriteFile(filename+".prov", []byte(sig), 0644)
}
// promptUser implements provenance.PassphraseFetcher
func promptUser(name string) ([]byte, error) {
fmt.Printf("Password for key %q > ", name)
// syscall.Stdin is not an int in all environments and needs to be coerced
// into one there (e.g., Windows)
pw, err := terminal.ReadPassword(int(syscall.Stdin))
fmt.Println()
return pw, err
}
func passphraseFileFetcher(passphraseFile string, stdin *os.File) (provenance.PassphraseFetcher, error) {
file, err := openPassphraseFile(passphraseFile, stdin)
if err != nil {
return nil, err
}
defer file.Close()
reader := bufio.NewReader(file)
passphrase, _, err := reader.ReadLine()
if err != nil {
return nil, err
}
return func(name string) ([]byte, error) {
return passphrase, nil
}, nil
}
func openPassphraseFile(passphraseFile string, stdin *os.File) (*os.File, error) {
if passphraseFile == "-" {
stat, err := stdin.Stat()
if err != nil {
return nil, err
}
if (stat.Mode() & os.ModeNamedPipe) == 0 {
return nil, errors.New("specified reading passphrase from stdin, without input on stdin")
}
return stdin, nil
}
return os.Open(passphraseFile)
}