optionally use existing ssh key for amazon builders

builder/amazon/common/run_config.go

@@ -19,6 +19,7 @@ type RunConfig struct {
 	SourceAmi                string            `mapstructure:"source_ami"`
 	RawSSHTimeout            string            `mapstructure:"ssh_timeout"`
 	SSHUsername              string            `mapstructure:"ssh_username"`
+	SSHPrivateKeyFile        string            `mapstructure:"ssh_private_key_file"`
 	SSHPort                  int               `mapstructure:"ssh_port"`
 	SecurityGroupId          string            `mapstructure:"security_group_id"`
 	SecurityGroupIds         []string          `mapstructure:"security_group_ids"`
@@ -91,6 +92,7 @@ func (c *RunConfig) Prepare(t *packer.ConfigTemplate) []error {
 		"instance_type":           &c.InstanceType,
 		"ssh_timeout":             &c.RawSSHTimeout,
 		"ssh_username":            &c.SSHUsername,
+		"ssh_private_key_file":    &c.SSHPrivateKeyFile,
 		"source_ami":              &c.SourceAmi,
 		"subnet_id":               &c.SubnetId,
 		"temporary_key_pair_name": &c.TemporaryKeyPairName,

builder/amazon/common/step_key_pair.go

@@ -5,19 +5,36 @@ import (
 	"github.com/mitchellh/goamz/ec2"
 	"github.com/mitchellh/multistep"
 	"github.com/mitchellh/packer/packer"
+	"io/ioutil"
 	"os"
 	"runtime"
 )
 
 type StepKeyPair struct {
-	Debug        bool
-	DebugKeyPath string
-	KeyPairName  string
+	Debug          bool
+	DebugKeyPath   string
+	KeyPairName    string
+	PrivateKeyFile string
 
 	keyName string
 }
 
 func (s *StepKeyPair) Run(state multistep.StateBag) multistep.StepAction {
+	if s.PrivateKeyFile != "" {
+		s.keyName = ""
+
+		privateKeyBytes, err := ioutil.ReadFile(s.PrivateKeyFile)
+		if err != nil {
+			state.Put("error", fmt.Errorf("Error loading configured private key file: %s", err))
+			return multistep.ActionHalt
+		}
+
+		state.Put("keyPair", "")
+		state.Put("privateKey", string(privateKeyBytes))
+
+		return multistep.ActionContinue
+	}
+
 	ec2conn := state.Get("ec2").(*ec2.EC2)
 	ui := state.Get("ui").(packer.Ui)
 

builder/amazon/ebs/builder.go

@@ -83,9 +83,10 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 	// Build the steps
 	steps := []multistep.Step{
 		&awscommon.StepKeyPair{
-			Debug:        b.config.PackerDebug,
-			DebugKeyPath: fmt.Sprintf("ec2_%s.pem", b.config.PackerBuildName),
-			KeyPairName:  b.config.TemporaryKeyPairName,
+			Debug:          b.config.PackerDebug,
+			DebugKeyPath:   fmt.Sprintf("ec2_%s.pem", b.config.PackerBuildName),
+			KeyPairName:    b.config.TemporaryKeyPairName,
+			PrivateKeyFile: b.config.SSHPrivateKeyFile,
 		},
 		&awscommon.StepSecurityGroup{
 			SecurityGroupIds: b.config.SecurityGroupIds,

builder/amazon/instance/builder.go

@@ -187,9 +187,10 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 	// Build the steps
 	steps := []multistep.Step{
 		&awscommon.StepKeyPair{
-			Debug:        b.config.PackerDebug,
-			DebugKeyPath: fmt.Sprintf("ec2_%s.pem", b.config.PackerBuildName),
-			KeyPairName:  b.config.TemporaryKeyPairName,
+			Debug:          b.config.PackerDebug,
+			DebugKeyPath:   fmt.Sprintf("ec2_%s.pem", b.config.PackerBuildName),
+			KeyPairName:    b.config.TemporaryKeyPairName,
+			PrivateKeyFile: b.config.SSHPrivateKeyFile,
 		},
 		&awscommon.StepSecurityGroup{
 			SecurityGroupIds: b.config.SecurityGroupIds,

website/source/docs/builders/amazon-ebs.html.markdown

@@ -108,6 +108,9 @@ Optional:
 * `ssh_port` (int) - The port that SSH will be available on. This defaults
   to port 22.
 
+* `ssh_private_key_file` - Use this ssh private key file instead of a generated
+  ssh key pair for connecting to the instance.
+
 * `ssh_timeout` (string) - The time to wait for SSH to become available
   before timing out. The format of this value is a duration such as "5s"
   or "5m". The default SSH timeout is "5m", or five minutes.

website/source/docs/builders/amazon-instance.html.markdown

@@ -147,6 +147,9 @@ Optional:
 * `ssh_port` (int) - The port that SSH will be available on. This defaults
   to port 22.
 
+* `ssh_private_key_file` - Use this ssh private key file instead of a generated
+  ssh key pair for connecting to the instance.
+
 * `ssh_timeout` (string) - The time to wait for SSH to become available
   before timing out. The format of this value is a duration such as "5s"
   or "5m". The default SSH timeout is "5m", or five minutes.