packer-cn/builder/qemu/builder.go

//go:generate struct-markdown
//go:generate mapstructure-to-hcl2 -type Config

package qemu

import (
	"context"
	"errors"
	"fmt"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"runtime"
	"strings"
	"time"

	"github.com/hashicorp/hcl/v2/hcldec"
	"github.com/hashicorp/packer/common"
	"github.com/hashicorp/packer/common/bootcommand"
	"github.com/hashicorp/packer/common/shutdowncommand"
	"github.com/hashicorp/packer/helper/communicator"
	"github.com/hashicorp/packer/helper/config"
	"github.com/hashicorp/packer/helper/multistep"
	"github.com/hashicorp/packer/packer"
	"github.com/hashicorp/packer/template/interpolate"
)

const BuilderId = "transcend.qemu"

var accels = map[string]struct{}{
	"none": {},
	"kvm":  {},
	"tcg":  {},
	"xen":  {},
	"hax":  {},
	"hvf":  {},
	"whpx": {},
}

var netDevice = map[string]bool{
	"ne2k_pci":       true,
	"i82551":         true,
	"i82557b":        true,
	"i82559er":       true,
	"rtl8139":        true,
	"e1000":          true,
	"pcnet":          true,
	"virtio":         true,
	"virtio-net":     true,
	"virtio-net-pci": true,
	"usb-net":        true,
	"i82559a":        true,
	"i82559b":        true,
	"i82559c":        true,
	"i82550":         true,
	"i82562":         true,
	"i82557a":        true,
	"i82557c":        true,
	"i82801":         true,
	"vmxnet3":        true,
	"i82558a":        true,
	"i82558b":        true,
}

var diskInterface = map[string]bool{
	"ide":         true,
	"scsi":        true,
	"virtio":      true,
	"virtio-scsi": true,
}

var diskCache = map[string]bool{
	"writethrough": true,
	"writeback":    true,
	"none":         true,
	"unsafe":       true,
	"directsync":   true,
}

var diskDiscard = map[string]bool{
	"unmap":  true,
	"ignore": true,
}

var diskDZeroes = map[string]bool{
	"unmap": true,
	"on":    true,
	"off":   true,
}

type Builder struct {
	config Config
	runner multistep.Runner
}

type Config struct {
	common.PackerConfig            `mapstructure:",squash"`
	common.HTTPConfig              `mapstructure:",squash"`
	common.ISOConfig               `mapstructure:",squash"`
	bootcommand.VNCConfig          `mapstructure:",squash"`
	shutdowncommand.ShutdownConfig `mapstructure:",squash"`
	Comm                           communicator.Config `mapstructure:",squash"`
	common.FloppyConfig            `mapstructure:",squash"`
	// Use iso from provided url. Qemu must support
	// curl block device. This defaults to `false`.
	ISOSkipCache bool `mapstructure:"iso_skip_cache" required:"false"`
	// The accelerator type to use when running the VM.
	// This may be `none`, `kvm`, `tcg`, `hax`, `hvf`, `whpx`, or `xen`. The appropriate
	// software must have already been installed on your build machine to use the
	// accelerator you specified. When no accelerator is specified, Packer will try
	// to use `kvm` if it is available but will default to `tcg` otherwise.
	//
	// -> The `hax` accelerator has issues attaching CDROM ISOs. This is an
	// upstream issue which can be tracked
	// [here](https://github.com/intel/haxm/issues/20).
	//
	// -> The `hvf` and `whpx` accelerator are new and experimental as of
	// [QEMU 2.12.0](https://wiki.qemu.org/ChangeLog/2.12#Host_support).
	// You may encounter issues unrelated to Packer when using these.  You may need to
	// add [ "-global", "virtio-pci.disable-modern=on" ] to `qemuargs` depending on the
	// guest operating system.
	//
	// -> For `whpx`, note that [Stefan Weil's QEMU for Windows distribution](https://qemu.weilnetz.de/w64/)
	// does not include WHPX support and users may need to compile or source a
	// build of QEMU for Windows themselves with WHPX support.
	Accelerator string `mapstructure:"accelerator" required:"false"`
	// Additional disks to create. Uses `vm_name` as the disk name template and
	// appends `-#` where `#` is the position in the array. `#` starts at 1 since 0
	// is the default disk. Each string represents the disk image size in bytes.
	// Optional suffixes 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G'
	// (gigabyte, 1024M), 'T' (terabyte, 1024G), 'P' (petabyte, 1024T) and 'E'
	// (exabyte, 1024P)  are supported. 'b' is ignored. Per qemu-img documentation.
	// Each additional disk uses the same disk parameters as the default disk.
	// Unset by default.
	AdditionalDiskSize []string `mapstructure:"disk_additional_size" required:"false"`
	// The number of cpus to use when building the VM.
	//  The default is `1` CPU.
	CpuCount int `mapstructure:"cpus" required:"false"`
	// The interface to use for the disk. Allowed values include any of `ide`,
	// `scsi`, `virtio` or `virtio-scsi`^\*. Note also that any boot commands
	// or kickstart type scripts must have proper adjustments for resulting
	// device names. The Qemu builder uses `virtio` by default.
	//
	// ^\* Please be aware that use of the `scsi` disk interface has been
	// disabled by Red Hat due to a bug described
	// [here](https://bugzilla.redhat.com/show_bug.cgi?id=1019220). If you are
	// running Qemu on RHEL or a RHEL variant such as CentOS, you *must* choose
	// one of the other listed interfaces. Using the `scsi` interface under
	// these circumstances will cause the build to fail.
	DiskInterface string `mapstructure:"disk_interface" required:"false"`
	// The size in bytes of the hard disk of the VM. Suffix with the first
	// letter of common byte types. Use "k" or "K" for kilobytes, "M" for
	// megabytes, G for gigabytes, and T for terabytes. If no value is provided
	// for disk_size, Packer uses a default of `40960M` (40 GB). If a disk_size
	// number is provided with no units, Packer will default to Megabytes.
	DiskSize string `mapstructure:"disk_size" required:"false"`
	// The cache mode to use for disk. Allowed values include any of
	// `writethrough`, `writeback`, `none`, `unsafe` or `directsync`. By
	// default, this is set to `writeback`.
	DiskCache string `mapstructure:"disk_cache" required:"false"`
	// The discard mode to use for disk. Allowed values
	// include any of unmap or ignore. By default, this is set to ignore.
	DiskDiscard string `mapstructure:"disk_discard" required:"false"`
	// The detect-zeroes mode to use for disk.
	// Allowed values include any of unmap, on or off. Defaults to off.
	// When the value is "off" we don't set the flag in the qemu command, so that
	// Packer still works with old versions of QEMU that don't have this option.
	DetectZeroes string `mapstructure:"disk_detect_zeroes" required:"false"`
	// Packer compacts the QCOW2 image using
	// qemu-img convert.  Set this option to true to disable compacting.
	// Defaults to false.
	SkipCompaction bool `mapstructure:"skip_compaction" required:"false"`
	// Apply compression to the QCOW2 disk file
	// using qemu-img convert. Defaults to false.
	DiskCompression bool `mapstructure:"disk_compression" required:"false"`
	// Either `qcow2` or `raw`, this specifies the output format of the virtual
	// machine image. This defaults to `qcow2`.
	Format string `mapstructure:"format" required:"false"`
	// Packer defaults to building QEMU virtual machines by
	// launching a GUI that shows the console of the machine being built. When this
	// value is set to `true`, the machine will start without a console.
	//
	// You can still see the console if you make a note of the VNC display
	// number chosen, and then connect using `vncviewer -Shared <host>:<display>`
	Headless bool `mapstructure:"headless" required:"false"`
	// Packer defaults to building from an ISO file, this parameter controls
	// whether the ISO URL supplied is actually a bootable QEMU image. When
	// this value is set to `true`, the machine will either clone the source or
	// use it as a backing file (if `use_backing_file` is `true`); then, it
	// will resize the image according to `disk_size` and boot it.
	DiskImage bool `mapstructure:"disk_image" required:"false"`
	// Only applicable when disk_image is true
	// and format is qcow2, set this option to true to create a new QCOW2
	// file that uses the file located at iso_url as a backing file. The new file
	// will only contain blocks that have changed compared to the backing file, so
	// enabling this option can significantly reduce disk usage.
	UseBackingFile bool `mapstructure:"use_backing_file" required:"false"`
	// The type of machine emulation to use. Run your qemu binary with the
	// flags `-machine help` to list available types for your system. This
	// defaults to `pc`.
	MachineType string `mapstructure:"machine_type" required:"false"`
	// The amount of memory to use when building the VM
	// in megabytes. This defaults to 512 megabytes.
	MemorySize int `mapstructure:"memory" required:"false"`
	// The driver to use for the network interface. Allowed values `ne2k_pci`,
	// `i82551`, `i82557b`, `i82559er`, `rtl8139`, `e1000`, `pcnet`, `virtio`,
	// `virtio-net`, `virtio-net-pci`, `usb-net`, `i82559a`, `i82559b`,
	// `i82559c`, `i82550`, `i82562`, `i82557a`, `i82557c`, `i82801`,
	// `vmxnet3`, `i82558a` or `i82558b`. The Qemu builder uses `virtio-net` by
	// default.
	NetDevice string `mapstructure:"net_device" required:"false"`
	// This is the path to the directory where the
	// resulting virtual machine will be created. This may be relative or absolute.
	// If relative, the path is relative to the working directory when packer
	// is executed. This directory must not exist or be empty prior to running
	// the builder. By default this is output-BUILDNAME where "BUILDNAME" is the
	// name of the build.
	OutputDir string `mapstructure:"output_directory" required:"false"`
	// Allows complete control over the qemu command line (though not, at this
	// time, qemu-img). Each array of strings makes up a command line switch
	// that overrides matching default switch/value pairs. Any value specified
	// as an empty string is ignored. All values after the switch are
	// concatenated with no separator.
	//
	// ~&gt; **Warning:** The qemu command line allows extreme flexibility, so
	// beware of conflicting arguments causing failures of your run. For
	// instance, using --no-acpi could break the ability to send power signal
	// type commands (e.g., shutdown -P now) to the virtual machine, thus
	// preventing proper shutdown. To see the defaults, look in the packer.log
	// file and search for the qemu-system-x86 command. The arguments are all
	// printed for review.
	//
	// The following shows a sample usage:
	//
	// ``` json {
	//   "qemuargs": [
	//     [ "-m", "1024M" ],
	//     [ "--no-acpi", "" ],
	//     [
	//       "-netdev",
	//       "user,id=mynet0,",
	//       "hostfwd=hostip:hostport-guestip:guestport",
	//       ""
	//     ],
	//     [ "-device", "virtio-net,netdev=mynet0" ]
	//   ]
	// }
	// ```
	//
	// would produce the following (not including other defaults supplied by
	// the builder and not otherwise conflicting with the qemuargs):
	//
	// ``` text qemu-system-x86 -m 1024m --no-acpi -netdev
	// user,id=mynet0,hostfwd=hostip:hostport-guestip:guestport -device
	// virtio-net,netdev=mynet0" ```
	//
	// ~&gt; **Windows Users:** [QEMU for Windows](https://qemu.weilnetz.de/)
	// builds are available though an environmental variable does need to be
	// set for QEMU for Windows to redirect stdout to the console instead of
	// stdout.txt.
	//
	// The following shows the environment variable that needs to be set for
	// Windows QEMU support:
	//
	// ``` text setx SDL_STDIO_REDIRECT=0 ```
	//
	// You can also use the `SSHHostPort` template variable to produce a packer
	// template that can be invoked by `make` in parallel:
	//
	// ``` json {
	//   "qemuargs": [
	//     [ "-netdev", "user,hostfwd=tcp::{{ .SSHHostPort }}-:22,id=forward"],
	//     [ "-device", "virtio-net,netdev=forward,id=net0"]
	//   ]
	// } ```
	//
	// `make -j 3 my-awesome-packer-templates` spawns 3 packer processes, each
	// of which will bind to their own SSH port as determined by each process.
	// This will also work with WinRM, just change the port forward in
	// `qemuargs` to map to WinRM's default port of `5985` or whatever value
	// you have the service set to listen on.
	QemuArgs [][]string `mapstructure:"qemuargs" required:"false"`
	// The name of the Qemu binary to look for. This
	// defaults to qemu-system-x86_64, but may need to be changed for
	// some platforms. For example qemu-kvm, or qemu-system-i386 may be a
	// better choice for some systems.
	QemuBinary string `mapstructure:"qemu_binary" required:"false"`
	// Enable QMP socket. Location is specified by `qmp_socket_path`. Defaults
	// to false.
	QMPEnable bool `mapstructure:"qmp_enable" required:"false"`
	// QMP Socket Path when `qmp_enable` is true. Defaults to
	// `output_directory`/`vm_name`.monitor.
	QMPSocketPath string `mapstructure:"qmp_socket_path" required:"false"`
	// The minimum and maximum port to use for the SSH port on the host machine
	// which is forwarded to the SSH port on the guest machine. Because Packer
	// often runs in parallel, Packer will choose a randomly available port in
	// this range to use as the host port. By default this is 2222 to 4444.
	SSHHostPortMin int `mapstructure:"ssh_host_port_min" required:"false"`
	SSHHostPortMax int `mapstructure:"ssh_host_port_max" required:"false"`
	// If true, do not pass a -display option
	// to qemu, allowing it to choose the default. This may be needed when running
	// under macOS, and getting errors about sdl not being available.
	UseDefaultDisplay bool `mapstructure:"use_default_display" required:"false"`
	// What QEMU -display option to use. Defaults to gtk, use none to not pass the
	// -display option allowing QEMU to choose the default. This may be needed when
	// running under macOS, and getting errors about sdl not being available.
	Display string `mapstructure:"display" required:"false"`
	// The IP address that should be
	// binded to for VNC. By default packer will use 127.0.0.1 for this. If you
	// wish to bind to all interfaces use 0.0.0.0.
	VNCBindAddress string `mapstructure:"vnc_bind_address" required:"false"`
	// Whether or not to set a password on the VNC server. This option
	// automatically enables the QMP socket. See `qmp_socket_path`. Defaults to
	// `false`.
	VNCUsePassword bool `mapstructure:"vnc_use_password" required:"false"`
	// The minimum and maximum port
	// to use for VNC access to the virtual machine. The builder uses VNC to type
	// the initial boot_command. Because Packer generally runs in parallel,
	// Packer uses a randomly chosen port in this range that appears available. By
	// default this is 5900 to 6000. The minimum and maximum ports are inclusive.
	VNCPortMin int `mapstructure:"vnc_port_min" required:"false"`
	VNCPortMax int `mapstructure:"vnc_port_max"`
	// This is the name of the image (QCOW2 or IMG) file for
	// the new virtual machine. By default this is packer-BUILDNAME, where
	// "BUILDNAME" is the name of the build. Currently, no file extension will be
	// used unless it is specified in this option.
	VMName string `mapstructure:"vm_name" required:"false"`
	// These are deprecated, but we keep them around for BC
	// TODO(@mitchellh): remove
	SSHWaitTimeout time.Duration `mapstructure:"ssh_wait_timeout" required:"false"`

	// TODO(mitchellh): deprecate
	RunOnce bool `mapstructure:"run_once"`

	ctx interpolate.Context
}

func (b *Builder) ConfigSpec() hcldec.ObjectSpec { return b.config.FlatMapstructure().HCL2Spec() }

func (b *Builder) Prepare(raws ...interface{}) ([]string, []string, error) {
	err := config.Decode(&b.config, &config.DecodeOpts{
		Interpolate:        true,
		InterpolateContext: &b.config.ctx,
		InterpolateFilter: &interpolate.RenderFilter{
			Exclude: []string{
				"boot_command",
				"qemuargs",
			},
		},
	}, raws...)
	if err != nil {
		return nil, nil, err
	}

	var errs *packer.MultiError
	warnings := make([]string, 0)
	errs = packer.MultiErrorAppend(errs, b.config.ShutdownConfig.Prepare(&b.config.ctx)...)

	if b.config.DiskSize == "" || b.config.DiskSize == "0" {
		b.config.DiskSize = "40960M"
	} else {
		// Make sure supplied disk size is valid
		// (digits, plus an optional valid unit character). e.g. 5000, 40G, 1t
		re := regexp.MustCompile(`^[\d]+(b|k|m|g|t){0,1}$`)
		matched := re.MatchString(strings.ToLower(b.config.DiskSize))
		if !matched {
			errs = packer.MultiErrorAppend(errs, fmt.Errorf("Invalid disk size."))
		} else {
			// Okay, it's valid -- if it doesn't alreay have a suffix, then
			// append "M" as the default unit.
			re = regexp.MustCompile(`^[\d]+$`)
			matched = re.MatchString(strings.ToLower(b.config.DiskSize))
			if matched {
				// Needs M added.
				b.config.DiskSize = fmt.Sprintf("%sM", b.config.DiskSize)
			}
		}
	}

	if b.config.DiskCache == "" {
		b.config.DiskCache = "writeback"
	}

	if b.config.DiskDiscard == "" {
		b.config.DiskDiscard = "ignore"
	}

	if b.config.DetectZeroes == "" {
		b.config.DetectZeroes = "off"
	}

	if b.config.Accelerator == "" {
		if runtime.GOOS == "windows" {
			b.config.Accelerator = "tcg"
		} else {
			// /dev/kvm is a kernel module that may be loaded if kvm is
			// installed and the host supports VT-x extensions. To make sure
			// this will actually work we need to os.Open() it. If os.Open fails
			// the kernel module was not installed or loaded correctly.
			if fp, err := os.Open("/dev/kvm"); err != nil {
				b.config.Accelerator = "tcg"
			} else {
				fp.Close()
				b.config.Accelerator = "kvm"
			}
		}
		log.Printf("use detected accelerator: %s", b.config.Accelerator)
	} else {
		log.Printf("use specified accelerator: %s", b.config.Accelerator)
	}

	if b.config.MachineType == "" {
		b.config.MachineType = "pc"
	}

	if b.config.OutputDir == "" {
		b.config.OutputDir = fmt.Sprintf("output-%s", b.config.PackerBuildName)
	}

	if b.config.QemuBinary == "" {
		b.config.QemuBinary = "qemu-system-x86_64"
	}

	if b.config.MemorySize < 10 {
		log.Printf("MemorySize %d is too small, using default: 512", b.config.MemorySize)
		b.config.MemorySize = 512
	}

	if b.config.CpuCount < 1 {
		log.Printf("CpuCount %d too small, using default: 1", b.config.CpuCount)
		b.config.CpuCount = 1
	}

	if b.config.SSHHostPortMin == 0 {
		b.config.SSHHostPortMin = 2222
	}

	if b.config.SSHHostPortMax == 0 {
		b.config.SSHHostPortMax = 4444
	}

	if b.config.VNCBindAddress == "" {
		b.config.VNCBindAddress = "127.0.0.1"
	}

	if b.config.VNCPortMin == 0 {
		b.config.VNCPortMin = 5900
	}

	if b.config.VNCPortMax == 0 {
		b.config.VNCPortMax = 6000
	}

	if b.config.VMName == "" {
		b.config.VMName = fmt.Sprintf("packer-%s", b.config.PackerBuildName)
	}

	if b.config.Format == "" {
		b.config.Format = "qcow2"
	}

	errs = packer.MultiErrorAppend(errs, b.config.FloppyConfig.Prepare(&b.config.ctx)...)
	errs = packer.MultiErrorAppend(errs, b.config.VNCConfig.Prepare(&b.config.ctx)...)

	if b.config.NetDevice == "" {
		b.config.NetDevice = "virtio-net"
	}

	if b.config.DiskInterface == "" {
		b.config.DiskInterface = "virtio"
	}

	// TODO: backwards compatibility, write fixer instead
	if b.config.SSHWaitTimeout != 0 {
		b.config.Comm.SSHTimeout = b.config.SSHWaitTimeout
	}

	if b.config.ISOSkipCache {
		b.config.ISOChecksumType = "none"
	}
	isoWarnings, isoErrs := b.config.ISOConfig.Prepare(&b.config.ctx)
	warnings = append(warnings, isoWarnings...)
	errs = packer.MultiErrorAppend(errs, isoErrs...)

	errs = packer.MultiErrorAppend(errs, b.config.HTTPConfig.Prepare(&b.config.ctx)...)
	if es := b.config.Comm.Prepare(&b.config.ctx); len(es) > 0 {
		errs = packer.MultiErrorAppend(errs, es...)
	}

	if !(b.config.Format == "qcow2" || b.config.Format == "raw") {
		errs = packer.MultiErrorAppend(
			errs, errors.New("invalid format, only 'qcow2' or 'raw' are allowed"))
	}

	if b.config.Format != "qcow2" {
		b.config.SkipCompaction = true
		b.config.DiskCompression = false
	}

	if b.config.UseBackingFile && !(b.config.DiskImage && b.config.Format == "qcow2") {
		errs = packer.MultiErrorAppend(
			errs, errors.New("use_backing_file can only be enabled for QCOW2 images and when disk_image is true"))
	}

	if b.config.DiskImage && len(b.config.AdditionalDiskSize) > 0 {
		errs = packer.MultiErrorAppend(
			errs, errors.New("disk_additional_size can only be used when disk_image is false"))
	}

	if _, ok := accels[b.config.Accelerator]; !ok {
		errs = packer.MultiErrorAppend(
			errs, errors.New("invalid accelerator, only 'kvm', 'tcg', 'xen', 'hax', 'hvf', 'whpx', or 'none' are allowed"))
	}

	if _, ok := netDevice[b.config.NetDevice]; !ok {
		errs = packer.MultiErrorAppend(
			errs, errors.New("unrecognized network device type"))
	}

	if _, ok := diskInterface[b.config.DiskInterface]; !ok {
		errs = packer.MultiErrorAppend(
			errs, errors.New("unrecognized disk interface type"))
	}

	if _, ok := diskCache[b.config.DiskCache]; !ok {
		errs = packer.MultiErrorAppend(
			errs, errors.New("unrecognized disk cache type"))
	}

	if _, ok := diskDiscard[b.config.DiskDiscard]; !ok {
		errs = packer.MultiErrorAppend(
			errs, errors.New("unrecognized disk discard type"))
	}

	if _, ok := diskDZeroes[b.config.DetectZeroes]; !ok {
		errs = packer.MultiErrorAppend(
			errs, errors.New("unrecognized disk detect zeroes setting"))
	}

	if !b.config.PackerForce {
		if _, err := os.Stat(b.config.OutputDir); err == nil {
			errs = packer.MultiErrorAppend(
				errs,
				fmt.Errorf("Output directory '%s' already exists. It must not exist.", b.config.OutputDir))
		}
	}

	if b.config.SSHHostPortMin > b.config.SSHHostPortMax {
		errs = packer.MultiErrorAppend(
			errs, errors.New("ssh_host_port_min must be less than ssh_host_port_max"))
	}

	if b.config.SSHHostPortMin < 0 {
		errs = packer.MultiErrorAppend(
			errs, errors.New("ssh_host_port_min must be positive"))
	}

	if b.config.VNCPortMin > b.config.VNCPortMax {
		errs = packer.MultiErrorAppend(
			errs, fmt.Errorf("vnc_port_min must be less than vnc_port_max"))
	}

	if b.config.VNCUsePassword && b.config.QMPSocketPath == "" {
		socketName := fmt.Sprintf("%s.monitor", b.config.VMName)
		b.config.QMPSocketPath = filepath.Join(b.config.OutputDir, socketName)
	}

	if b.config.QemuArgs == nil {
		b.config.QemuArgs = make([][]string, 0)
	}

	if errs != nil && len(errs.Errors) > 0 {
		return nil, warnings, errs
	}

	return nil, warnings, nil
}

func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (packer.Artifact, error) {
	// Create the driver that we'll use to communicate with Qemu
	driver, err := b.newDriver(b.config.QemuBinary)
	if err != nil {
		return nil, fmt.Errorf("Failed creating Qemu driver: %s", err)
	}

	steprun := &stepRun{}
	if !b.config.DiskImage {
		steprun.BootDrive = "once=d"
		steprun.Message = "Starting VM, booting from CD-ROM"
	} else {
		steprun.BootDrive = "c"
		steprun.Message = "Starting VM, booting disk image"
	}

	steps := []multistep.Step{}
	if !b.config.ISOSkipCache {
		steps = append(steps, &common.StepDownload{
			Checksum:     b.config.ISOChecksum,
			ChecksumType: b.config.ISOChecksumType,
			Description:  "ISO",
			Extension:    b.config.TargetExtension,
			ResultKey:    "iso_path",
			TargetPath:   b.config.TargetPath,
			Url:          b.config.ISOUrls,
		},
		)
	} else {
		steps = append(steps, &stepSetISO{
			ResultKey: "iso_path",
			Url:       b.config.ISOUrls,
		},
		)
	}

	steps = append(steps, new(stepPrepareOutputDir),
		&common.StepCreateFloppy{
			Files:       b.config.FloppyConfig.FloppyFiles,
			Directories: b.config.FloppyConfig.FloppyDirectories,
			Label:       b.config.FloppyConfig.FloppyLabel,
		},
		new(stepCreateDisk),
		new(stepCopyDisk),
		new(stepResizeDisk),
		&common.StepHTTPServer{
			HTTPDir:     b.config.HTTPDir,
			HTTPPortMin: b.config.HTTPPortMin,
			HTTPPortMax: b.config.HTTPPortMax,
		},
	)

	if b.config.Comm.Type != "none" {
		steps = append(steps,
			new(stepForwardSSH),
		)
	}

	steps = append(steps,
		new(stepConfigureVNC),
		steprun,
		new(stepConfigureQMP),
		&stepTypeBootCommand{},
	)

	if b.config.Comm.Type != "none" {
		steps = append(steps,
			&communicator.StepConnect{
				Config:    &b.config.Comm,
				Host:      commHost(b.config.Comm.SSHHost),
				SSHConfig: b.config.Comm.SSHConfigFunc(),
				SSHPort:   commPort,
				WinRMPort: commPort,
			},
		)
	}

	steps = append(steps,
		new(common.StepProvision),
	)

	steps = append(steps,
		&common.StepCleanupTempKeys{
			Comm: &b.config.Comm,
		},
	)
	steps = append(steps,
		new(stepShutdown),
	)

	steps = append(steps,
		new(stepConvertDisk),
	)

	// Setup the state bag
	state := new(multistep.BasicStateBag)
	state.Put("config", &b.config)
	state.Put("debug", b.config.PackerDebug)
	state.Put("driver", driver)
	state.Put("hook", hook)
	state.Put("ui", ui)

	// Run
	b.runner = common.NewRunnerWithPauseFn(steps, b.config.PackerConfig, ui, state)
	b.runner.Run(ctx, state)

	// If there was an error, return that
	if rawErr, ok := state.GetOk("error"); ok {
		return nil, rawErr.(error)
	}

	// If we were interrupted or cancelled, then just exit.
	if _, ok := state.GetOk(multistep.StateCancelled); ok {
		return nil, errors.New("Build was cancelled.")
	}

	if _, ok := state.GetOk(multistep.StateHalted); ok {
		return nil, errors.New("Build was halted.")
	}

	// Compile the artifact list
	files := make([]string, 0, 5)
	visit := func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		if !info.IsDir() {
			files = append(files, path)
		}

		return nil
	}

	if err := filepath.Walk(b.config.OutputDir, visit); err != nil {
		return nil, err
	}

	artifact := &Artifact{
		dir:   b.config.OutputDir,
		f:     files,
		state: make(map[string]interface{}),
	}

	artifact.state["diskName"] = b.config.VMName
	diskpaths, ok := state.Get("qemu_disk_paths").([]string)
	if ok {
		artifact.state["diskPaths"] = diskpaths
	}
	artifact.state["diskType"] = b.config.Format
	artifact.state["diskSize"] = b.config.DiskSize
	artifact.state["domainType"] = b.config.Accelerator

	return artifact, nil
}

func (b *Builder) newDriver(qemuBinary string) (Driver, error) {
	qemuPath, err := exec.LookPath(qemuBinary)
	if err != nil {
		return nil, err
	}

	qemuImgPath, err := exec.LookPath("qemu-img")
	if err != nil {
		return nil, err
	}

	log.Printf("Qemu path: %s, Qemu Image page: %s", qemuPath, qemuImgPath)
	driver := &QemuDriver{
		QemuPath:    qemuPath,
		QemuImgPath: qemuImgPath,
	}

	if err := driver.Verify(); err != nil {
		return nil, err
	}

	return driver, nil
}