Added template processing for QemuArgs, floppy_files for auto-building floppies which attach to the VM at startup, and run_once flag to trigger just one powerup/powerdown.

builder/qemu/builder.go

@@ -58,6 +58,7 @@ type config struct {
 	BootCommand     []string   `mapstructure:"boot_command"`
 	DiskInterface   string     `mapstructure:"disk_interface"`
 	DiskSize        uint       `mapstructure:"disk_size"`
+	FloppyFiles     []string   `mapstructure:"floppy_files"`
 	Format          string     `mapstructure:"format"`
 	Headless        bool       `mapstructure:"headless"`
 	HTTPDir         string     `mapstructure:"http_directory"`
@@ -79,6 +80,7 @@ type config struct {
 	VNCPortMin      uint       `mapstructure:"vnc_port_min"`
 	VNCPortMax      uint       `mapstructure:"vnc_port_max"`
 	VMName          string     `mapstructure:"vm_name"`
+	RunOnce         bool       `mapstructure:"run_once"`
 
 	RawBootWait        string `mapstructure:"boot_wait"`
 	RawSingleISOUrl    string `mapstructure:"iso_url"`
@@ -150,8 +152,13 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		b.config.VNCPortMax = 6000
 	}
 
-	if b.config.QemuArgs == nil {
+	for i, args := range b.config.QemuArgs {
-		b.config.QemuArgs = make([][]string, 0)
+		for j, arg := range args {
+			if err := b.config.tpl.Validate(arg); err != nil {
+				errs = packer.MultiErrorAppend(errs,
+					fmt.Errorf("Error processing qemu-system_x86-64[%d][%d]: %s", i, j, err))
+			}
+		}
 	}
 
 	if b.config.VMName == "" {
@@ -162,6 +169,10 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		b.config.Format = "qcow2"
 	}
 
+	if b.config.FloppyFiles == nil {
+		b.config.FloppyFiles = make([]string, 0)
+	}
+
 	if b.config.NetDevice == "" {
 		b.config.NetDevice = "virtio-net"
 	}
@@ -215,6 +226,16 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		}
 	}
 
+	for i, file := range b.config.FloppyFiles {
+		var err error
+		b.config.FloppyFiles[i], err = b.config.tpl.Process(file, nil)
+		if err != nil {
+			errs = packer.MultiErrorAppend(errs,
+				fmt.Errorf("Error processing floppy_files[%d]: %s",
+					i, err))
+		}
+	}
+
 	if !(b.config.Format == "qcow2" || b.config.Format == "raw") {
 		errs = packer.MultiErrorAppend(
 			errs, errors.New("invalid format, only 'qcow2' or 'img' are allowed"))
@@ -336,13 +357,8 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 			errs, fmt.Errorf("vnc_port_min must be less than vnc_port_max"))
 	}
 
-	for i, args := range b.config.QemuArgs {
+	if b.config.QemuArgs == nil {
-		for j, arg := range args {
+		b.config.QemuArgs = make([][]string, 0)
-			if err := b.config.tpl.Validate(arg); err != nil {
-				errs = packer.MultiErrorAppend(errs,
-					fmt.Errorf("Error processing qemu-system_x86-64[%d][%d]: %s", i, j, err))
-			}
-		}
 	}
 
 	if errs != nil && len(errs.Errors) > 0 {
@@ -368,6 +384,9 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			Url:          b.config.ISOUrls,
 		},
 		new(stepPrepareOutputDir),
+		&common.StepCreateFloppy{
+			Files: b.config.FloppyFiles,
+		},
 		new(stepCreateDisk),
 		new(stepHTTPServer),
 		new(stepForwardSSH),
@@ -376,6 +395,10 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			BootDrive: "d",
 			Message:   "Starting VM, booting from CD-ROM",
 		},
+	}
+
+	if !b.config.RunOnce {
+		steps = append(steps,
 			&stepBootWait{},
 			&stepTypeBootCommand{},
 			&stepWaitForShutdown{
@@ -385,6 +408,10 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 				BootDrive: "c",
 				Message:   "Starting VM, booting from hard disk",
 			},
+		)
+	}
+
+	steps = append(steps,
 		&common.StepConnectSSH{
 			SSHAddress:     sshAddress,
 			SSHConfig:      sshConfig,
@@ -392,7 +419,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		},
 		new(common.StepProvision),
 		new(stepShutdown),
-	}
+	)
 
 	// Setup the state bag
 	state := new(multistep.BasicStateBag)

builder/qemu/step_run.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/mitchellh/multistep"
 	"github.com/mitchellh/packer/packer"
+	"log"
 	"path/filepath"
 	"strings"
 )
@@ -14,13 +15,27 @@ type stepRun struct {
 	Message   string
 }
 
+type qemuArgsTemplateData struct {
+	HTTPIP    string
+	HTTPPort  uint
+	HTTPDir   string
+	OutputDir string
+	Name      string
+}
+
 func (s *stepRun) Run(state multistep.StateBag) multistep.StepAction {
 	driver := state.Get("driver").(Driver)
 	ui := state.Get("ui").(packer.Ui)
 
 	ui.Say(s.Message)
 
-	command := getCommandArgs(s.BootDrive, state)
+	command, err := getCommandArgs(s.BootDrive, state)
+	if err != nil {
+		err := fmt.Errorf("Error processing QemuArggs: %s", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
 	if err := driver.Qemu(command...); err != nil {
 		err := fmt.Errorf("Error launching VM: %s", err)
 		ui.Error(err.Error())
@@ -39,7 +54,7 @@ func (s *stepRun) Cleanup(state multistep.StateBag) {
 	}
 }
 
-func getCommandArgs(bootDrive string, state multistep.StateBag) []string {
+func getCommandArgs(bootDrive string, state multistep.StateBag) ([]string, error) {
 	config := state.Get("config").(*config)
 	isoPath := state.Get("iso_path").(string)
 	vncPort := state.Get("vnc_port").(uint)
@@ -72,14 +87,34 @@ func getCommandArgs(bootDrive string, state multistep.StateBag) []string {
 	defaultArgs["-redir"] = fmt.Sprintf("tcp:%v::22", sshHostPort)
 	defaultArgs["-vnc"] = vnc
 
+	// Determine if we have a floppy disk to attach
+	if floppyPathRaw, ok := state.GetOk("floppy_path"); ok {
+		defaultArgs["-fda"] = floppyPathRaw.(string)
+	} else {
+		log.Println("Qemu Builder has no floppy files, not attaching a floppy.")
+	}
+
 	inArgs := make(map[string][]string)
 	if len(config.QemuArgs) > 0 {
 		ui.Say("Overriding defaults Qemu arguments with QemuArgs...")
 
-		// becuase qemu supports multiple appearances of the same
+		httpPort := state.Get("http_port").(uint)
+		tplData := qemuArgsTemplateData{
+			"10.0.2.2",
+			httpPort,
+			config.HTTPDir,
+			config.OutputDir,
+			config.VMName,
+		}
+		newQemuArgs, err := processArgs(config.QemuArgs, config.tpl, &tplData)
+		if err != nil {
+			return nil, err
+		}
+
+		// because qemu supports multiple appearances of the same
 		// switch, just different values, each key in the args hash
 		// will have an array of string values
-		for _, qemuArgs := range config.QemuArgs {
+		for _, qemuArgs := range newQemuArgs {
 			key := qemuArgs[0]
 			val := strings.Join(qemuArgs[1:], "")
 			if _, ok := inArgs[key]; !ok {
@@ -112,5 +147,27 @@ func getCommandArgs(bootDrive string, state multistep.StateBag) []string {
 		}
 	}
 
-	return outArgs
+	return outArgs, nil
+}
+
+func processArgs(args [][]string, tpl *packer.ConfigTemplate, tplData *qemuArgsTemplateData) ([][]string, error) {
+	var err error
+
+	if args == nil {
+		return make([][]string, 0), err
+	}
+
+	newArgs := make([][]string, len(args))
+	for argsIdx, rowArgs := range args {
+		parms := make([]string, len(rowArgs))
+		newArgs[argsIdx] = parms
+		for i, parm := range rowArgs {
+			parms[i], err = tpl.Process(parm, &tplData)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return newArgs, err
 }

website/source/docs/builders/qemu.html.markdown

@@ -118,6 +118,14 @@ Optional:
 * `format` (string) - Either "qcow2" or "img", this specifies the output
   format of the virtual machine image. This defaults to "qcow2".
 
+* `floppy_files` (array of strings) - A list of files to place onto a floppy
+  disk that gets attached when Packer powers up the VM. This is most useful
+  for unattended Windows installs, which look for an `Autounattend.xml` file
+  on removable media. By default no floppy will be attached. All files
+  listed in this setting get placed into the root directory of the floppy
+  and teh floppy is attached as the first floppy device. Currently, no
+  support exists for sub-directories.
+
 * `headless` (bool) - Packer defaults to building 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.
@@ -191,6 +199,16 @@ Optional:
   By default this is "output-BUILDNAME" where "BUILDNAME" is the name
   of the build.
 
+* `run_once` (boolean) - When set to true, run_once causes the builder to run
+  Qemu only once, rather than twice. Normally (default false) the builder
+  will run Qemu once for an initial OS install, then switch the CDROM device
+  and boot device for a second run. In that case, Packer does not wait for
+  SSH connections until the second power up of the VM. This approach is often
+  necessary in Linux distribution installs. However, in many Windows unattended
+  installs, the setup handles reboots and dealing with the CDROM as the boot
+  device. With care, a power-down/power-up setting (run_once is set to false)
+  could work if the unattended install is set to restart into audit mode.
+
 * `shutdown_command` (string) - The command to use to gracefully shut down
   the machine once all the provisioning is done. By default this is an empty
   string, which tells Packer to just forcefully shut down the machine.