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100 lines
2.7 KiB
100 lines
2.7 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 getter
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import (
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"bytes"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"k8s.io/helm/pkg/helm/environment"
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"k8s.io/helm/pkg/plugin"
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)
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// collectPlugins scans for getter plugins.
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// This will load plugins according to the environment.
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func collectPlugins(settings environment.EnvSettings) (Providers, error) {
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plugins, err := plugin.FindPlugins(settings.PluginDirs())
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if err != nil {
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return nil, err
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}
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var result Providers
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for _, plugin := range plugins {
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for _, downloader := range plugin.Metadata.Downloaders {
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result = append(result, Provider{
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Schemes: downloader.Protocols,
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New: newPluginGetter(
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downloader.Command,
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settings,
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plugin.Metadata.Name,
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plugin.Dir,
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),
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})
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}
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}
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return result, nil
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}
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// pluginGetter is a generic type to invoke custom downloaders,
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// implemented in plugins.
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type pluginGetter struct {
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command string
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certFile, keyFile, cAFile string
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settings environment.EnvSettings
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name string
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base string
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}
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// Get runs downloader plugin command
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func (p *pluginGetter) Get(href string) (*bytes.Buffer, error) {
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commands := strings.Split(p.command, " ")
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argv := append(commands[1:], p.certFile, p.keyFile, p.cAFile, href)
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prog := exec.Command(filepath.Join(p.base, commands[0]), argv...)
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plugin.SetupPluginEnv(p.settings, p.name, p.base)
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prog.Env = os.Environ()
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buf := bytes.NewBuffer(nil)
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prog.Stdout = buf
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prog.Stderr = os.Stderr
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prog.Stdin = os.Stdin
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if err := prog.Run(); err != nil {
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if eerr, ok := err.(*exec.ExitError); ok {
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os.Stderr.Write(eerr.Stderr)
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return nil, fmt.Errorf("plugin %q exited with error", p.command)
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}
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return nil, err
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}
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return buf, nil
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}
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// newPluginGetter constructs a valid plugin getter
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func newPluginGetter(command string, settings environment.EnvSettings, name, base string) Constructor {
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return func(URL, CertFile, KeyFile, CAFile string) (Getter, error) {
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result := &pluginGetter{
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command: command,
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certFile: CertFile,
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keyFile: KeyFile,
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cAFile: CAFile,
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settings: settings,
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name: name,
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base: base,
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}
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return result, nil
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}
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}
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