Re-add sonobuoy gen plugin.

Super helpful for debugging plugin generation.

Signed-off-by: liz <liz@heptio.com>

cmd/sonobuoy/app/gen_plugin.go

@@ -0,0 +1,120 @@
+/*
+Copyright 2018 Heptio Inc.
+
+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 app
+
+import (
+ "crypto/ecdsa"
+ "crypto/elliptic"
+ "crypto/rand"
+ "crypto/tls"
+ "crypto/x509"
+ "fmt"
+ "math/big"
+ "os"
+
+ "github.com/heptio/sonobuoy/pkg/config"
+ "github.com/heptio/sonobuoy/pkg/errlog"
+ "github.com/heptio/sonobuoy/pkg/plugin"
+ "github.com/heptio/sonobuoy/pkg/plugin/loader"
+ "github.com/pkg/errors"
+ "github.com/spf13/cobra"
+)
+
+const (
+ placeholderHostname = "<hostname>"
+)
+
+// GenPluginConfig are the input options for running
+type GenPluginConfig struct {
+ Paths []string
+ PluginName string
+}
+
+var genPluginOpts GenPluginConfig
+
+func init() {
+ cmd := &cobra.Command{
+ Use: "plugin",
+ Short: "Generates the manifest Sonobuoy uses to run a worker for the given plugin",
+ Run: genPluginManifest,
+ Hidden: true,
+ Args: cobra.ExactArgs(1),
+ }
+
+ GenCommand.PersistentFlags().StringArrayVarP(
+ &genPluginOpts.Paths, "paths", "p", []string{".", "./examples/plugins.d/"},
+ "the paths to search for the plugins in. Defaults to . and ./plugins.d/",
+ )
+ // TODO: Other options?
+ GenCommand.AddCommand(cmd)
+}
+
+func genPluginManifest(cmd *cobra.Command, args []string) {
+ genPluginOpts.PluginName = args[0]
+ code := 0
+ manifest, err := generatePluginManifest(genPluginOpts)
+ if err == nil {
+ fmt.Printf("%s\n", manifest)
+ } else {
+ errlog.LogError(errors.Wrap(err, "error attempting to generate sonobuoy manifest"))
+ code = 1
+ }
+ os.Exit(code)
+}
+
+func generatePluginManifest(cfg GenPluginConfig) ([]byte, error) {
+ plugins, err := loader.LoadAllPlugins(
+ config.DefaultNamespace,
+ config.DefaultImage,
+ "Always",
+ cfg.Paths,
+ []plugin.Selection{{Name: cfg.PluginName}},
+ )
+ if err != nil {
+ return nil, err
+ }
+
+ if len(plugins) != 1 {
+ return nil, fmt.Errorf("expected 1 plugin, got %v", len(plugins))
+ }
+
+ cert, err := genCert()
+ if err != nil {
+ return nil, err
+ }
+
+ return plugins[0].FillTemplate(placeholderHostname, cert)
+}
+
+func genCert() (*tls.Certificate, error) {
+ privKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+ if err != nil {
+ return nil, errors.Wrap(err, "couldn't generate private key")
+ }
+ tmpl := &x509.Certificate{
+ SerialNumber: big.NewInt(0),
+ }
+ certDER, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, &privKey.PublicKey, privKey)
+ if err != nil {
+ return nil, errors.Wrap(err, "couldn't create certificate")
+ }
+
+ return &tls.Certificate{
+ Certificate: [][]byte{certDER},
+ PrivateKey: privKey,
+ }, nil
+}