You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
helm/pkg/getter/plugingetter.go

111 lines
3.0 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 getter
import (
"bytes"
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/pkg/errors"
"helm.sh/helm/v3/pkg/cli"
"helm.sh/helm/v3/pkg/plugin"
)
// collectPlugins scans for getter plugins.
// This will load plugins according to the cli.
func collectPlugins(settings *cli.EnvSettings) (Providers, error) {
plugins, err := plugin.FindPlugins(settings.PluginsDirectory)
if err != nil {
return nil, err
}
var result Providers
for _, plugin := range plugins {
for _, downloader := range plugin.Metadata.Downloaders {
result = append(result, Provider{
Schemes: downloader.Protocols,
New: NewPluginGetter(
downloader.Command,
settings,
plugin.Metadata.Name,
plugin.Dir,
),
})
}
}
return result, nil
}
// pluginGetter is a generic type to invoke custom downloaders,
// implemented in plugins.
type pluginGetter struct {
command string
settings *cli.EnvSettings
name string
base string
opts options
}
func (p *pluginGetter) setupOptionsEnv(env []string) []string {
env = append(env, fmt.Sprintf("HELM_PLUGIN_USERNAME=%s", p.opts.username))
env = append(env, fmt.Sprintf("HELM_PLUGIN_PASSWORD=%s", p.opts.password))
env = append(env, fmt.Sprintf("HELM_PLUGIN_PASS_CREDENTIALS_ALL=%t", p.opts.passCredentialsAll))
return env
}
// Get runs downloader plugin command
func (p *pluginGetter) Get(href string, options ...Option) (*bytes.Buffer, error) {
for _, opt := range options {
opt(&p.opts)
}
commands := strings.Split(p.command, " ")
argv := append(commands[1:], p.opts.certFile, p.opts.keyFile, p.opts.caFile, href)
prog := exec.Command(filepath.Join(p.base, commands[0]), argv...)
plugin.SetupPluginEnv(p.settings, p.name, p.base)
prog.Env = p.setupOptionsEnv(os.Environ())
buf := bytes.NewBuffer(nil)
prog.Stdout = buf
prog.Stderr = os.Stderr
if err := prog.Run(); err != nil {
if eerr, ok := err.(*exec.ExitError); ok {
os.Stderr.Write(eerr.Stderr)
return nil, errors.Errorf("plugin %q exited with error", p.command)
}
return nil, err
}
return buf, nil
}
// NewPluginGetter constructs a valid plugin getter
func NewPluginGetter(command string, settings *cli.EnvSettings, name, base string) Constructor {
return func(options ...Option) (Getter, error) {
result := &pluginGetter{
command: command,
settings: settings,
name: name,
base: base,
}
for _, opt := range options {
opt(&result.opts)
}
return result, nil
}
}