Added options for the cpu count, memory, audio, and usb to the virtualbox builder.

builder/virtualbox/common/hw_config.go

@@ -0,0 +1,46 @@
+package common
+
+import (
+	"fmt"
+
+	"github.com/hashicorp/packer/template/interpolate"
+)
+
+type HWConfig struct {
+
+	// cpu information
+	CpuCount   int `mapstructure:"cpu_count"`
+	MemorySize int `mapstructure:"memory_size"`
+
+	// device presence
+	Sound string `mapstructure:"sound"`
+	USB   bool   `mapstructure:"usb"`
+}
+
+func (c *HWConfig) Prepare(ctx *interpolate.Context) []error {
+	var errs []error
+
+	// Hardware and cpu options
+	if c.CpuCount < 0 {
+		errs = append(errs, fmt.Errorf("An invalid cpu_count was specified (cpu_count < 0): %d", c.CpuCount))
+		c.CpuCount = 0
+	}
+	if c.CpuCount == 0 {
+		c.CpuCount = 1
+	}
+
+	if c.MemorySize < 0 {
+		errs = append(errs, fmt.Errorf("An invalid memory_size was specified (memory_size < 0): %d", c.MemorySize))
+		c.MemorySize = 0
+	}
+	if c.MemorySize == 0 {
+		c.MemorySize = 512
+	}
+
+	// devices
+	if c.Sound == "" {
+		c.Sound = "none"
+	}
+
+	return nil
+}

builder/virtualbox/common/hw_config_test.go

@@ -0,0 +1,20 @@
+package common
+
+import (
+	"testing"
+)
+
+func TestHWConfigPrepare(t *testing.T) {
+	c := new(HWConfig)
+	if errs := c.Prepare(testConfigTemplate(t)); len(errs) > 0 {
+		t.Fatalf("err: %#v", errs)
+	}
+
+	if c.CpuCount < 1 {
+		t.Errorf("bad cpu count: %d", c.CpuCount)
+	}
+
+	if c.MemorySize < 64 {
+		t.Errorf("bad memory size: %d", c.MemorySize)
+	}
+}

builder/virtualbox/iso/builder.go

@@ -35,6 +35,7 @@ type Config struct {
 	vboxcommon.RunConfig            `mapstructure:",squash"`
 	vboxcommon.ShutdownConfig       `mapstructure:",squash"`
 	vboxcommon.SSHConfig            `mapstructure:",squash"`
+	vboxcommon.HWConfig             `mapstructure:",squash"`
 	vboxcommon.VBoxManageConfig     `mapstructure:",squash"`
 	vboxcommon.VBoxManagePostConfig `mapstructure:",squash"`
 	vboxcommon.VBoxVersionConfig    `mapstructure:",squash"`
@@ -92,6 +93,7 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 	errs = packer.MultiErrorAppend(errs, b.config.RunConfig.Prepare(&b.config.ctx)...)
 	errs = packer.MultiErrorAppend(errs, b.config.ShutdownConfig.Prepare(&b.config.ctx)...)
 	errs = packer.MultiErrorAppend(errs, b.config.SSHConfig.Prepare(&b.config.ctx)...)
+	errs = packer.MultiErrorAppend(errs, b.config.HWConfig.Prepare(&b.config.ctx)...)
 	errs = packer.MultiErrorAppend(errs, b.config.VBoxManageConfig.Prepare(&b.config.ctx)...)
 	errs = packer.MultiErrorAppend(errs, b.config.VBoxManagePostConfig.Prepare(&b.config.ctx)...)
 	errs = packer.MultiErrorAppend(errs, b.config.VBoxVersionConfig.Prepare(&b.config.ctx)...)

builder/virtualbox/iso/step_create_vm.go

@@ -3,6 +3,8 @@ package iso
 import (
 	"context"
 	"fmt"
+	"strconv"
+	"strings"
 
 	vboxcommon "github.com/hashicorp/packer/builder/virtualbox/common"
 	"github.com/hashicorp/packer/helper/multistep"
@@ -24,7 +26,7 @@ func (s *stepCreateVM) Run(_ context.Context, state multistep.StateBag) multiste
 
 	name := config.VMName
 
-	commands := make([][]string, 4)
+	commands := make([][]string, 6)
 	commands[0] = []string{
 		"createvm", "--name", name,
 		"--ostype", config.GuestOSType, "--register",
@@ -33,8 +35,15 @@ func (s *stepCreateVM) Run(_ context.Context, state multistep.StateBag) multiste
 		"modifyvm", name,
 		"--boot1", "disk", "--boot2", "dvd", "--boot3", "none", "--boot4", "none",
 	}
-	commands[2] = []string{"modifyvm", name, "--cpus", "1"}
-	commands[3] = []string{"modifyvm", name, "--memory", "512"}
+	commands[2] = []string{"modifyvm", name, "--cpus", strconv.Itoa(config.HWConfig.CpuCount)}
+	commands[3] = []string{"modifyvm", name, "--memory", strconv.Itoa(config.HWConfig.MemorySize)}
+	commands[4] = []string{"modifyvm", name, "--usb", map[bool]string{true: "on", false: "off"}[config.HWConfig.USB]}
+
+	if strings.ToLower(config.HWConfig.Sound) == "none" {
+		commands[5] = []string{"modifyvm", name, "--audio", config.HWConfig.Sound}
+	} else {
+		commands[5] = []string{"modifyvm", name, "--audio", config.HWConfig.Sound, "--audioin", "on", "--audioout", "on"}
+	}
 
 	ui.Say("Creating virtual machine...")
 	for _, command := range commands {