builder/*: extract key path to ssh.Signer

builder/parallels/common/ssh.go

 package common
 
 import (
-	"code.google.com/p/go.crypto/ssh"
 	"fmt"
+
+	"code.google.com/p/go.crypto/ssh"
 	"github.com/mitchellh/multistep"
+	commonssh "github.com/mitchellh/packer/common/ssh"
 	packerssh "github.com/mitchellh/packer/communicator/ssh"
-	"io/ioutil"
-	"os"
 )
 
 func SSHAddress(state multistep.StateBag) (string, error) {
@@ -35,7 +35,7 @@ func SSHConfigFunc(config SSHConfig) func(multistep.StateBag) (*ssh.ClientConfig
 		}
 
 		if config.SSHKeyPath != "" {
-			signer, err := sshKeyToSigner(config.SSHKeyPath)
+			signer, err := commonssh.FileSigner(config.SSHKeyPath)
 			if err != nil {
 				return nil, err
 			}
@@ -49,23 +49,3 @@ func SSHConfigFunc(config SSHConfig) func(multistep.StateBag) (*ssh.ClientConfig
 		}, nil
 	}
 }
-
-func sshKeyToSigner(path string) (ssh.Signer, error) {
-	f, err := os.Open(path)
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	keyBytes, err := ioutil.ReadAll(f)
-	if err != nil {
-		return nil, err
-	}
-
-	signer, err := ssh.ParsePrivateKey(keyBytes)
-	if err != nil {
-		return nil, fmt.Errorf("Error setting up SSH config: %s", err)
-	}
-
-	return signer, nil
-}

builder/parallels/common/ssh_config.go

@@ -3,9 +3,11 @@ package common
 import (
 	"errors"
 	"fmt"
-	"github.com/mitchellh/packer/packer"
 	"os"
 	"time"
+
+	commonssh "github.com/mitchellh/packer/common/ssh"
+	"github.com/mitchellh/packer/packer"
 )
 
 type SSHConfig struct {
@@ -46,7 +48,7 @@ func (c *SSHConfig) Prepare(t *packer.ConfigTemplate) []error {
 	if c.SSHKeyPath != "" {
 		if _, err := os.Stat(c.SSHKeyPath); err != nil {
 			errs = append(errs, fmt.Errorf("ssh_key_path is invalid: %s", err))
-		} else if _, err := sshKeyToSigner(c.SSHKeyPath); err != nil {
+		} else if _, err := commonssh.FileSigner(c.SSHKeyPath); err != nil {
 			errs = append(errs, fmt.Errorf("ssh_key_path is invalid: %s", err))
 		}
 	}

builder/qemu/builder.go

@@ -3,15 +3,17 @@ package qemu
 import (
 	"errors"
 	"fmt"
-	"github.com/mitchellh/multistep"
-	"github.com/mitchellh/packer/common"
-	"github.com/mitchellh/packer/packer"
 	"log"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
 	"time"
+
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/common"
+	commonssh "github.com/mitchellh/packer/common/ssh"
+	"github.com/mitchellh/packer/packer"
 )
 
 const BuilderId = "transcend.qemu"
@@ -352,7 +354,7 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		if _, err := os.Stat(b.config.SSHKeyPath); err != nil {
 			errs = packer.MultiErrorAppend(
 				errs, fmt.Errorf("ssh_key_path is invalid: %s", err))
-		} else if _, err := sshKeyToSigner(b.config.SSHKeyPath); err != nil {
+		} else if _, err := commonssh.FileSigner(b.config.SSHKeyPath); err != nil {
 			errs = packer.MultiErrorAppend(
 				errs, fmt.Errorf("ssh_key_path is invalid: %s", err))
 		}

builder/qemu/ssh.go

 package qemu
 
 import (
-	gossh "code.google.com/p/go.crypto/ssh"
 	"fmt"
+
+	gossh "code.google.com/p/go.crypto/ssh"
 	"github.com/mitchellh/multistep"
+	commonssh "github.com/mitchellh/packer/common/ssh"
 	"github.com/mitchellh/packer/communicator/ssh"
-	"io/ioutil"
-	"os"
 )
 
 func sshAddress(state multistep.StateBag) (string, error) {
@@ -24,7 +24,7 @@ func sshConfig(state multistep.StateBag) (*gossh.ClientConfig, error) {
 	}
 
 	if config.SSHKeyPath != "" {
-		signer, err := sshKeyToSigner(config.SSHKeyPath)
+		signer, err := commonssh.FileSigner(config.SSHKeyPath)
 		if err != nil {
 			return nil, err
 		}
@@ -37,23 +37,3 @@ func sshConfig(state multistep.StateBag) (*gossh.ClientConfig, error) {
 		Auth: auth,
 	}, nil
 }
-
-func sshKeyToSigner(path string) (gossh.Signer, error) {
-	f, err := os.Open(path)
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	keyBytes, err := ioutil.ReadAll(f)
-	if err != nil {
-		return nil, err
-	}
-
-	signer, err := gossh.ParsePrivateKey(keyBytes)
-	if err != nil {
-		return nil, fmt.Errorf("Error setting up SSH config: %s", err)
-	}
-
-	return signer, nil
-}

builder/virtualbox/common/ssh.go

 package common
 
 import (
-	gossh "code.google.com/p/go.crypto/ssh"
 	"fmt"
+
+	gossh "code.google.com/p/go.crypto/ssh"
 	"github.com/mitchellh/multistep"
+	commonssh "github.com/mitchellh/packer/common/ssh"
 	"github.com/mitchellh/packer/communicator/ssh"
-	"io/ioutil"
-	"os"
 )
 
 func SSHAddress(state multistep.StateBag) (string, error) {
@@ -23,7 +23,7 @@ func SSHConfigFunc(config SSHConfig) func(multistep.StateBag) (*gossh.ClientConf
 		}
 
 		if config.SSHKeyPath != "" {
-			signer, err := sshKeyToSigner(config.SSHKeyPath)
+			signer, err := commonssh.FileSigner(config.SSHKeyPath)
 			if err != nil {
 				return nil, err
 			}
@@ -37,23 +37,3 @@ func SSHConfigFunc(config SSHConfig) func(multistep.StateBag) (*gossh.ClientConf
 		}, nil
 	}
 }
-
-func sshKeyToSigner(path string) (gossh.Signer, error) {
-	f, err := os.Open(path)
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	keyBytes, err := ioutil.ReadAll(f)
-	if err != nil {
-		return nil, err
-	}
-
-	signer, err := gossh.ParsePrivateKey(keyBytes)
-	if err != nil {
-		return nil, fmt.Errorf("Error setting up SSH config: %s", err)
-	}
-
-	return signer, nil
-}

builder/virtualbox/common/ssh_config.go

@@ -3,9 +3,11 @@ package common
 import (
 	"errors"
 	"fmt"
-	"github.com/mitchellh/packer/packer"
 	"os"
 	"time"
+
+	commonssh "github.com/mitchellh/packer/common/ssh"
+	"github.com/mitchellh/packer/packer"
 )
 
 type SSHConfig struct {
@@ -56,7 +58,7 @@ func (c *SSHConfig) Prepare(t *packer.ConfigTemplate) []error {
 	if c.SSHKeyPath != "" {
 		if _, err := os.Stat(c.SSHKeyPath); err != nil {
 			errs = append(errs, fmt.Errorf("ssh_key_path is invalid: %s", err))
-		} else if _, err := sshKeyToSigner(c.SSHKeyPath); err != nil {
+		} else if _, err := commonssh.FileSigner(c.SSHKeyPath); err != nil {
 			errs = append(errs, fmt.Errorf("ssh_key_path is invalid: %s", err))
 		}
 	}

builder/vmware/common/ssh.go

 package common
 
 import (
-	gossh "code.google.com/p/go.crypto/ssh"
 	"errors"
 	"fmt"
 	"io/ioutil"
 	"log"
 	"os"
 
+	gossh "code.google.com/p/go.crypto/ssh"
 	"github.com/mitchellh/multistep"
+	commonssh "github.com/mitchellh/packer/common/ssh"
 	"github.com/mitchellh/packer/communicator/ssh"
 )
 
@@ -74,7 +75,7 @@ func SSHConfigFunc(config *SSHConfig) func(multistep.StateBag) (*gossh.ClientCon
 		}
 
 		if config.SSHKeyPath != "" {
-			signer, err := sshKeyToSigner(config.SSHKeyPath)
+			signer, err := commonssh.FileSigner(config.SSHKeyPath)
 			if err != nil {
 				return nil, err
 			}
@@ -88,23 +89,3 @@ func SSHConfigFunc(config *SSHConfig) func(multistep.StateBag) (*gossh.ClientCon
 		}, nil
 	}
 }
-
-func sshKeyToSigner(path string) (gossh.Signer, error) {
-	f, err := os.Open(path)
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	keyBytes, err := ioutil.ReadAll(f)
-	if err != nil {
-		return nil, err
-	}
-
-	signer, err := gossh.ParsePrivateKey(keyBytes)
-	if err != nil {
-		return nil, fmt.Errorf("Error setting up SSH config: %s", err)
-	}
-
-	return signer, nil
-}

builder/vmware/common/ssh_config.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"time"
 
+	commonssh "github.com/mitchellh/packer/common/ssh"
 	"github.com/mitchellh/packer/packer"
 )
 
@@ -51,7 +52,7 @@ func (c *SSHConfig) Prepare(t *packer.ConfigTemplate) []error {
 	if c.SSHKeyPath != "" {
 		if _, err := os.Stat(c.SSHKeyPath); err != nil {
 			errs = append(errs, fmt.Errorf("ssh_key_path is invalid: %s", err))
-		} else if _, err := sshKeyToSigner(c.SSHKeyPath); err != nil {
+		} else if _, err := commonssh.FileSigner(c.SSHKeyPath); err != nil {
 			errs = append(errs, fmt.Errorf("ssh_key_path is invalid: %s", err))
 		}
 	}

common/ssh/key.go

+package ssh
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"code.google.com/p/go.crypto/ssh"
+)
+
+// FileSigner returns an ssh.Signer for a key file.
+func FileSigner(path string) (ssh.Signer, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	keyBytes, err := ioutil.ReadAll(f)
+	if err != nil {
+		return nil, err
+	}
+
+	signer, err := ssh.ParsePrivateKey(keyBytes)
+	if err != nil {
+		return nil, fmt.Errorf("Error setting up SSH config: %s", err)
+	}
+
+	return signer, nil
+}