scaleway: fix builder problems with ssh keys

The builder is currently failing with the last packer version.

This commit is fixing:
- the ssh keys and configuration management (the config is passed through a pointer and the ssh keys through the config instead of the runner states)
- the key size for generated ssh key
- the public key added as a tag to the instance<Paste>

fix #6757

builder/scaleway/builder.go

@@ -19,7 +19,7 @@ import (
 const BuilderId = "hashicorp.scaleway"
 
 type Builder struct {
-	config Config
+	config *Config
 	runner multistep.Runner
 }
 
@@ -28,7 +28,7 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 	if errs != nil {
 		return warnings, errs
 	}
-	b.config = *c
+	b.config = c
 
 	return nil, nil
 }
@@ -50,7 +50,6 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 	steps := []multistep.Step{
 		&stepCreateSSHKey{
 			Debug:        b.config.PackerDebug,
-			Comm:         &b.config.Comm,
 			DebugKeyPath: fmt.Sprintf("scw_%s.pem", b.config.PackerBuildName),
 		},
 		new(stepCreateServer),

builder/scaleway/step_create_image.go

@@ -15,7 +15,7 @@ type stepImage struct{}
 func (s *stepImage) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
 	client := state.Get("client").(*api.ScalewayAPI)
 	ui := state.Get("ui").(packer.Ui)
-	c := state.Get("config").(Config)
+	c := state.Get("config").(*Config)
 	snapshotID := state.Get("snapshot_id").(string)
 	bootscriptID := ""
 

builder/scaleway/step_create_server.go

@@ -17,8 +17,7 @@ type stepCreateServer struct {
 func (s *stepCreateServer) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
 	client := state.Get("client").(*api.ScalewayAPI)
 	ui := state.Get("ui").(packer.Ui)
-	c := state.Get("config").(Config)
-	sshPubKey := state.Get("ssh_pubkey").(string)
+	c := state.Get("config").(*Config)
 	tags := []string{}
 	var bootscript *string
 
@@ -28,8 +27,8 @@ func (s *stepCreateServer) Run(_ context.Context, state multistep.StateBag) mult
 		bootscript = &c.Bootscript
 	}
 
-	if sshPubKey != "" {
-		tags = []string{fmt.Sprintf("AUTHORIZED_KEY=%s", strings.TrimSpace(sshPubKey))}
+	if c.Comm.SSHPublicKey != nil {
+		tags = []string{fmt.Sprintf("AUTHORIZED_KEY=%s", strings.Replace(strings.TrimSpace(string(c.Comm.SSHPublicKey)), " ", "_", -1))}
 	}
 
 	server, err := client.PostServer(api.ScalewayServerDefinition{

builder/scaleway/step_create_ssh_key.go

@@ -1,7 +1,6 @@
 package scaleway
 
 import (
-	"bytes"
 	"context"
 	"crypto/rand"
 	"crypto/rsa"
@@ -13,7 +12,6 @@ import (
 	"os"
 	"runtime"
 
-	"github.com/hashicorp/packer/helper/communicator"
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
 	"golang.org/x/crypto/ssh"
@@ -21,31 +19,31 @@ import (
 
 type stepCreateSSHKey struct {
 	Debug        bool
-	Comm         *communicator.Config
 	DebugKeyPath string
 }
 
 func (s *stepCreateSSHKey) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
 	ui := state.Get("ui").(packer.Ui)
+	config := state.Get("config").(*Config)
 
-	if s.Comm.SSHPrivateKeyFile != "" {
+	if config.Comm.SSHPrivateKeyFile != "" {
 		ui.Say("Using existing SSH private key")
-		privateKeyBytes, err := ioutil.ReadFile(s.Comm.SSHPrivateKeyFile)
+		privateKeyBytes, err := ioutil.ReadFile(config.Comm.SSHPrivateKeyFile)
 		if err != nil {
 			state.Put("error", fmt.Errorf(
 				"Error loading configured private key file: %s", err))
 			return multistep.ActionHalt
 		}
 
-		s.Comm.SSHPrivateKey = privateKeyBytes
-		s.Comm.SSHPublicKey = nil
+		config.Comm.SSHPrivateKey = privateKeyBytes
+		config.Comm.SSHPublicKey = nil
 
 		return multistep.ActionContinue
 	}
 
 	ui.Say("Creating temporary ssh key for server...")
 
-	priv, err := rsa.GenerateKey(rand.Reader, 2014)
+	priv, err := rsa.GenerateKey(rand.Reader, 4096)
 	if err != nil {
 		err := fmt.Errorf("Error creating temporary SSH key: %s", err)
 		state.Put("error", err)
@@ -61,17 +59,19 @@ func (s *stepCreateSSHKey) Run(_ context.Context, state multistep.StateBag) mult
 		Bytes:   priv_der,
 	}
 
-	// Set the private key in the config for later
-	s.Comm.SSHPrivateKey = pem.EncodeToMemory(&priv_blk)
-
-	pub, _ := ssh.NewPublicKey(&priv.PublicKey)
-	pub_sshformat := ssh.MarshalAuthorizedKey(pub)
-	pub_sshformat = bytes.Replace(pub_sshformat, []byte(" "), []byte("_"), -1)
+	pub, err := ssh.NewPublicKey(&priv.PublicKey)
+	if err != nil {
+		err := fmt.Errorf("Error creating temporary SSH key: %s", err)
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
 
 	log.Printf("temporary ssh key created")
 
 	// Remember some state for the future
-	s.Comm.SSHPublicKey = pub_sshformat
+	config.Comm.SSHPrivateKey = pem.EncodeToMemory(&priv_blk)
+	config.Comm.SSHPublicKey = ssh.MarshalAuthorizedKey(pub)
 
 	// If we're in debug mode, output the private key to the working directory.
 	if s.Debug {

builder/scaleway/step_snapshot.go

@@ -15,7 +15,7 @@ type stepSnapshot struct{}
 func (s *stepSnapshot) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
 	client := state.Get("client").(*api.ScalewayAPI)
 	ui := state.Get("ui").(packer.Ui)
-	c := state.Get("config").(Config)
+	c := state.Get("config").(*Config)
 	volumeID := state.Get("root_volume_id").(string)
 
 	ui.Say(fmt.Sprintf("Creating snapshot: %v", c.SnapshotName))