set PACKER_HTTP_ADDR env var when available.

If using a builder that has an http server set up for file transfer,
expose the connection info to the shell provisioner through the environment
variable PACKER_HTTP_ADDR.

Closes #2869

builder/hyperv/common/step_type_boot_command.go

@@ -8,6 +8,7 @@ import (
 	"unicode/utf8"
 
 	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/common"
 	"github.com/mitchellh/packer/packer"
 	"github.com/mitchellh/packer/template/interpolate"
 )
@@ -42,6 +43,7 @@ func (s *StepTypeBootCommand) Run(state multistep.StateBag) multistep.StepAction
 
 	ui.Say(fmt.Sprintf("Host IP for the HyperV machine: %s", hostIp))
 
+	common.SetHTTPIP(hostIp)
 	s.Ctx.Data = &bootCommandTemplateData{
 		hostIp,
 		httpPort,

builder/parallels/common/step_type_boot_command.go

@@ -9,6 +9,7 @@ import (
 	"unicode/utf8"
 
 	"github.com/mitchellh/multistep"
+	packer_common "github.com/mitchellh/packer/common"
 	"github.com/mitchellh/packer/packer"
 	"github.com/mitchellh/packer/template/interpolate"
 )
@@ -67,6 +68,7 @@ func (s *StepTypeBootCommand) Run(state multistep.StateBag) multistep.StepAction
 
 	ui.Say(fmt.Sprintf("Host IP for the Parallels machine: %s", hostIP))
 
+	packer_common.SetHTTPIP(hostIP)
 	s.Ctx.Data = &bootCommandTemplateData{
 		hostIP,
 		httpPort,

builder/qemu/step_type_boot_command.go

@@ -72,9 +72,11 @@ func (s *stepTypeBootCommand) Run(state multistep.StateBag) multistep.StepAction
 
 	log.Printf("Connected to VNC desktop: %s", c.DesktopName)
 
+	hostIP := "10.0.2.2"
+	common.SetHTTPIP(hostIP)
 	ctx := config.ctx
 	ctx.Data = &bootCommandTemplateData{
-		"10.0.2.2",
+		hostIP,
 		httpPort,
 		config.VMName,
 	}

builder/virtualbox/common/step_type_boot_command.go

@@ -9,6 +9,7 @@ import (
 	"unicode/utf8"
 
 	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/common"
 	"github.com/mitchellh/packer/packer"
 	"github.com/mitchellh/packer/template/interpolate"
 )
@@ -49,8 +50,10 @@ func (s *StepTypeBootCommand) Run(state multistep.StateBag) multistep.StepAction
 		pauseFn = state.Get("pauseFn").(multistep.DebugPauseFn)
 	}
 
+	hostIP := "10.0.2.2"
+	common.SetHTTPIP(hostIP)
 	s.Ctx.Data = &bootCommandTemplateData{
-		"10.0.2.2",
+		hostIP,
 		httpPort,
 		s.VMName,
 	}

builder/vmware/common/step_type_boot_command.go

@@ -95,7 +95,7 @@ func (s *StepTypeBootCommand) Run(state multistep.StateBag) multistep.StepAction
 		ipFinder = &IfconfigIPFinder{Device: "vmnet8"}
 	}
 
-	hostIp, err := ipFinder.HostIP()
+	hostIP, err := ipFinder.HostIP()
 	if err != nil {
 		err := fmt.Errorf("Error detecting host IP: %s", err)
 		state.Put("error", err)
@@ -103,10 +103,11 @@ func (s *StepTypeBootCommand) Run(state multistep.StateBag) multistep.StepAction
 		return multistep.ActionHalt
 	}
 
-	log.Printf("Host IP for the VMware machine: %s", hostIp)
+	log.Printf("Host IP for the VMware machine: %s", hostIP)
+	common.SetHTTPIP(hostIP)
 
 	s.Ctx.Data = &bootCommandTemplateData{
-		hostIp,
+		hostIP,
 		httpPort,
 		s.VMName,
 	}

common/step_http_server.go

@@ -2,12 +2,16 @@ package common
 
 import (
 	"fmt"
-	"github.com/mitchellh/multistep"
-	"github.com/mitchellh/packer/packer"
+	"io/ioutil"
 	"log"
 	"math/rand"
 	"net"
 	"net/http"
+	"os"
+	"path/filepath"
+
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/packer"
 )
 
 // This step creates and runs the HTTP server that is serving files from the
@@ -66,13 +70,41 @@ func (s *StepHTTPServer) Run(state multistep.StateBag) multistep.StepAction {
 
 	// Save the address into the state so it can be accessed in the future
 	state.Put("http_port", httpPort)
+	SetHTTPPort(fmt.Sprintf("%d", httpPort))
 
 	return multistep.ActionContinue
 }
 
+func httpAddrFilename(suffix string) string {
+	uuid := os.Getenv("PACKER_RUN_UUID")
+	return filepath.Join(os.TempDir(), fmt.Sprintf("packer-%s-%s", uuid, suffix))
+}
+
+func SetHTTPPort(port string) error {
+	return ioutil.WriteFile(httpAddrFilename("port"), []byte(port), 0644)
+}
+
+func SetHTTPIP(ip string) error {
+	return ioutil.WriteFile(httpAddrFilename("ip"), []byte(ip), 0644)
+}
+
+func GetHTTPAddr() string {
+	ip, err := ioutil.ReadFile(httpAddrFilename("ip"))
+	if err != nil {
+		return ""
+	}
+	port, err := ioutil.ReadFile(httpAddrFilename("port"))
+	if err != nil {
+		return ""
+	}
+	return fmt.Sprintf("%s:%s", ip, port)
+}
+
 func (s *StepHTTPServer) Cleanup(multistep.StateBag) {
 	if s.l != nil {
 		// Close the listener so that the HTTP server stops
 		s.l.Close()
 	}
+	os.Remove(httpAddrFilename("port"))
+	os.Remove(httpAddrFilename("ip"))
 }

provisioner/shell/provisioner.go

@@ -229,10 +229,12 @@ func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 	}
 
 	// Build our variables up by adding in the build name and builder type
-	envVars := make([]string, len(p.config.Vars)+2)
+	envVars := make([]string, len(p.config.Vars)+3)
 	envVars[0] = fmt.Sprintf("PACKER_BUILD_NAME='%s'", p.config.PackerBuildName)
 	envVars[1] = fmt.Sprintf("PACKER_BUILDER_TYPE='%s'", p.config.PackerBuilderType)
-	copy(envVars[2:], p.config.Vars)
+	envVars[2] = fmt.Sprintf("PACKER_HTTP_ADDR=%s", common.GetHTTPAddr())
+
+	copy(envVars[3:], p.config.Vars)
 
 	for _, path := range scripts {
 		ui.Say(fmt.Sprintf("Provisioning with shell script: %s", path))