builder/virtualbox: support http server for ovf [GH-1169]

builder/virtualbox/common/run_config.go

 package common
 
 import (
+	"errors"
 	"fmt"
-	"github.com/mitchellh/packer/packer"
 	"time"
+
+	"github.com/mitchellh/packer/packer"
 )
 
 type RunConfig struct {
 	Headless    bool   `mapstructure:"headless"`
 	RawBootWait string `mapstructure:"boot_wait"`
 
+	HTTPDir     string `mapstructure:"http_directory"`
+	HTTPPortMin uint   `mapstructure:"http_port_min"`
+	HTTPPortMax uint   `mapstructure:"http_port_max"`
+
 	BootWait time.Duration ``
 }
 
@@ -18,8 +24,17 @@ func (c *RunConfig) Prepare(t *packer.ConfigTemplate) []error {
 		c.RawBootWait = "10s"
 	}
 
+	if c.HTTPPortMin == 0 {
+		c.HTTPPortMin = 8000
+	}
+
+	if c.HTTPPortMax == 0 {
+		c.HTTPPortMax = 9000
+	}
+
 	templates := map[string]*string{
 		"boot_wait":      &c.RawBootWait,
+		"http_directory": &c.HTTPDir,
 	}
 
 	errs := make([]error, 0)
@@ -37,5 +52,10 @@ func (c *RunConfig) Prepare(t *packer.ConfigTemplate) []error {
 		errs = append(errs, fmt.Errorf("Failed parsing boot_wait: %s", err))
 	}
 
+	if c.HTTPPortMin > c.HTTPPortMax {
+		errs = append(errs,
+			errors.New("http_port_min must be less than http_port_max"))
+	}
+
 	return errs
 }

builder/virtualbox/common/step_http_server.go

+package common
+
+import (
+	"fmt"
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/packer"
+	"log"
+	"math/rand"
+	"net"
+	"net/http"
+)
+
+// This step creates and runs the HTTP server that is serving files from the
+// directory specified by the 'http_directory` configuration parameter in the
+// template.
+//
+// Uses:
+//   ui     packer.Ui
+//
+// Produces:
+//   http_port int - The port the HTTP server started on.
+type StepHTTPServer struct {
+	HTTPDir     string
+	HTTPPortMin uint
+	HTTPPortMax uint
+
+	l net.Listener
+}
+
+func (s *StepHTTPServer) Run(state multistep.StateBag) multistep.StepAction {
+	ui := state.Get("ui").(packer.Ui)
+
+	var httpPort uint = 0
+	if s.HTTPDir == "" {
+		state.Put("http_port", httpPort)
+		return multistep.ActionContinue
+	}
+
+	// Find an available TCP port for our HTTP server
+	var httpAddr string
+	portRange := int(s.HTTPPortMax - s.HTTPPortMin)
+	for {
+		var err error
+		var offset uint = 0
+
+		if portRange > 0 {
+			// Intn will panic if portRange == 0, so we do a check.
+			offset = uint(rand.Intn(portRange))
+		}
+
+		httpPort = offset + s.HTTPPortMin
+		httpAddr = fmt.Sprintf(":%d", httpPort)
+		log.Printf("Trying port: %d", httpPort)
+		s.l, err = net.Listen("tcp", httpAddr)
+		if err == nil {
+			break
+		}
+	}
+
+	ui.Say(fmt.Sprintf("Starting HTTP server on port %d", httpPort))
+
+	// Start the HTTP server and run it in the background
+	fileServer := http.FileServer(http.Dir(s.HTTPDir))
+	server := &http.Server{Addr: httpAddr, Handler: fileServer}
+	go server.Serve(s.l)
+
+	// Save the address into the state so it can be accessed in the future
+	state.Put("http_port", httpPort)
+
+	return multistep.ActionContinue
+}
+
+func (s *StepHTTPServer) Cleanup(multistep.StateBag) {
+	if s.l != nil {
+		// Close the listener so that the HTTP server stops
+		s.l.Close()
+	}
+}

builder/virtualbox/iso/builder.go

@@ -42,9 +42,6 @@ type config struct {
 	GuestAdditionsSHA256 string   `mapstructure:"guest_additions_sha256"`
 	GuestOSType          string   `mapstructure:"guest_os_type"`
 	HardDriveInterface   string   `mapstructure:"hard_drive_interface"`
-	HTTPDir              string   `mapstructure:"http_directory"`
-	HTTPPortMin          uint     `mapstructure:"http_port_min"`
-	HTTPPortMax          uint     `mapstructure:"http_port_max"`
 	ISOChecksum          string   `mapstructure:"iso_checksum"`
 	ISOChecksumType      string   `mapstructure:"iso_checksum_type"`
 	ISOInterface         string   `mapstructure:"iso_interface"`
@@ -103,14 +100,6 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		b.config.GuestOSType = "Other"
 	}
 
-	if b.config.HTTPPortMin == 0 {
-		b.config.HTTPPortMin = 8000
-	}
-
-	if b.config.HTTPPortMax == 0 {
-		b.config.HTTPPortMax = 9000
-	}
-
 	if b.config.ISOInterface == "" {
 		b.config.ISOInterface = "ide"
 	}
@@ -125,7 +114,6 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		"guest_additions_sha256": &b.config.GuestAdditionsSHA256,
 		"guest_os_type":          &b.config.GuestOSType,
 		"hard_drive_interface":   &b.config.HardDriveInterface,
-		"http_directory":         &b.config.HTTPDir,
 		"iso_checksum":           &b.config.ISOChecksum,
 		"iso_checksum_type":      &b.config.ISOChecksumType,
 		"iso_interface":          &b.config.ISOInterface,
@@ -175,11 +163,6 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 			errs, errors.New("hard_drive_interface can only be ide or sata"))
 	}
 
-	if b.config.HTTPPortMin > b.config.HTTPPortMax {
-		errs = packer.MultiErrorAppend(
-			errs, errors.New("http_port_min must be less than http_port_max"))
-	}
-
 	if b.config.ISOChecksumType == "" {
 		errs = packer.MultiErrorAppend(
 			errs, errors.New("The iso_checksum_type must be specified."))
@@ -298,7 +281,11 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		&common.StepCreateFloppy{
 			Files: b.config.FloppyFiles,
 		},
-		new(stepHTTPServer),
+		&vboxcommon.StepHTTPServer{
+			HTTPDir:     b.config.HTTPDir,
+			HTTPPortMin: b.config.HTTPPortMin,
+			HTTPPortMax: b.config.HTTPPortMax,
+		},
 		new(vboxcommon.StepSuppressMessages),
 		new(stepCreateVM),
 		new(stepCreateDisk),

builder/virtualbox/ovf/builder.go

@@ -61,6 +61,11 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		&common.StepCreateFloppy{
 			Files: b.config.FloppyFiles,
 		},
+		&vboxcommon.StepHTTPServer{
+			HTTPDir:     b.config.HTTPDir,
+			HTTPPortMin: b.config.HTTPPortMin,
+			HTTPPortMax: b.config.HTTPPortMax,
+		},
 		&vboxcommon.StepDownloadGuestAdditions{
 			GuestAdditionsMode:   b.config.GuestAdditionsMode,
 			GuestAdditionsURL:    b.config.GuestAdditionsURL,

website/source/docs/builders/virtualbox-ovf.html.markdown

@@ -109,6 +109,21 @@ each category, the available options are alphabetized and described.
   machine being built. When this value is set to true, the machine will
   start without a console.
 
+* `http_directory` (string) - Path to a directory to serve using an HTTP
+  server. The files in this directory will be available over HTTP that will
+  be requestable from the virtual machine. This is useful for hosting
+  kickstart files and so on. By default this is "", which means no HTTP
+  server will be started. The address and port of the HTTP server will be
+  available as variables in `boot_command`. This is covered in more detail
+  below.
+
+* `http_port_min` and `http_port_max` (integer) - These are the minimum and
+  maximum port to use for the HTTP server started to serve the `http_directory`.
+  Because Packer often runs in parallel, Packer will choose a randomly available
+  port in this range to run the HTTP server. If you want to force the HTTP
+  server to be on one port, make this minimum and maximum port the same.
+  By default the values are 8000 and 9000, respectively.
+
 * `import_flags` (array of strings) - Additional flags to pass to
     `VBoxManage import`. This can be used to add additional command-line flags
     such as `--eula-accept` to accept a EULA in the OVF.