Ansible: don't use deprecated ssh options when ver above 2.0

Ansible 2.0 deprecated ansible_ssh_user, ansible_ssh_port, ansible_ssh_host
instead use ansible_user, ansible_port, and ansible_host in the
inventory file.

Closes #3275

provisioner/ansible/provisioner.go

@@ -16,6 +16,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"strconv"
 	"strings"
 	"sync"
@@ -53,9 +54,11 @@ type Config struct {
 }
 
 type Provisioner struct {
-	config  Config
-	adapter *adapter
-	done    chan struct{}
+	config            Config
+	adapter           *adapter
+	done              chan struct{}
+	ansibleVersion    string
+	ansibleMajVersion uint
 }
 
 func (p *Provisioner) Prepare(raws ...interface{}) error {
@@ -111,12 +114,43 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 		p.config.LocalPort = "0"
 	}
 
+	err = p.getVersion()
+	if err != nil {
+		errs = packer.MultiErrorAppend(errs, err)
+	}
+
 	if errs != nil && len(errs.Errors) > 0 {
 		return errs
 	}
 	return nil
 }
 
+func (p *Provisioner) getVersion() error {
+	out, err := exec.Command(p.config.Command, "--version").Output()
+	if err != nil {
+		return err
+	}
+
+	versionRe := regexp.MustCompile(`\w (\d+\.\d+[.\d+]*)`)
+	matches := versionRe.FindStringSubmatch(string(out))
+	if matches == nil {
+		return fmt.Errorf(
+			"Could not find %s version in output:\n%s", p.config.Command, string(out))
+	}
+
+	version := matches[1]
+	log.Printf("%s version: %s", p.config.Command, version)
+	p.ansibleVersion = version
+
+	majVer, err := strconv.ParseUint(strings.Split(version, ".")[0], 10, 0)
+	if err != nil {
+		return fmt.Errorf("Could not parse major version from \"%s\".", version)
+	}
+	p.ansibleMajVersion = uint(majVer)
+
+	return nil
+}
+
 func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 	ui.Say("Provisioning with Ansible...")
 
@@ -206,7 +240,10 @@ func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 		}
 		defer os.Remove(tf.Name())
 
-		host := fmt.Sprintf("%s ansible_ssh_host=127.0.0.1 ansible_ssh_user=packer-ansible ansible_ssh_port=%s\n", p.config.HostAlias, p.config.LocalPort)
+		host := fmt.Sprintf("%s ansible_host=127.0.0.1 ansible_user=packer-ansible ansible_port=%s\n", p.config.HostAlias, p.config.LocalPort)
+		if p.ansibleMajVersion < 2 {
+			host = fmt.Sprintf("%s ansible_ssh_host=127.0.0.1 ansible_ssh_user=packer-ansible ansible_ssh_port=%s\n", p.config.HostAlias, p.config.LocalPort)
+		}
 
 		w := bufio.NewWriter(tf)
 		w.WriteString(host)

provisioner/ansible/provisioner_test.go

@@ -6,13 +6,28 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"path"
 	"testing"
 
 	"github.com/mitchellh/packer/packer"
 )
 
-func testConfig() map[string]interface{} {
+// Be sure to remove the Ansible stub file in each test with:
+//   defer os.Remove(config["command"].(string))
+func testConfig(t *testing.T) map[string]interface{} {
 	m := make(map[string]interface{})
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	ansible_stub := path.Join(wd, "packer-ansible-stub.sh")
+
+	err = ioutil.WriteFile(ansible_stub, []byte("#!/usr/bin/env bash\necho ansible 1.6.0"), 0777)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	m["command"] = ansible_stub
+
 	return m
 }
 
@@ -26,7 +41,8 @@ func TestProvisioner_Impl(t *testing.T) {
 
 func TestProvisionerPrepare_Defaults(t *testing.T) {
 	var p Provisioner
-	config := testConfig()
+	config := testConfig(t)
+	defer os.Remove(config["command"].(string))
 
 	err := p.Prepare(config)
 	if err == nil {
@@ -62,7 +78,8 @@ func TestProvisionerPrepare_Defaults(t *testing.T) {
 
 func TestProvisionerPrepare_PlaybookFile(t *testing.T) {
 	var p Provisioner
-	config := testConfig()
+	config := testConfig(t)
+	defer os.Remove(config["command"].(string))
 
 	hostkey_file, err := ioutil.TempFile("", "hostkey")
 	if err != nil {
@@ -99,7 +116,8 @@ func TestProvisionerPrepare_PlaybookFile(t *testing.T) {
 
 func TestProvisionerPrepare_HostKeyFile(t *testing.T) {
 	var p Provisioner
-	config := testConfig()
+	config := testConfig(t)
+	defer os.Remove(config["command"].(string))
 
 	publickey_file, err := ioutil.TempFile("", "publickey")
 	if err != nil {
@@ -143,7 +161,8 @@ func TestProvisionerPrepare_HostKeyFile(t *testing.T) {
 
 func TestProvisionerPrepare_AuthorizedKeyFile(t *testing.T) {
 	var p Provisioner
-	config := testConfig()
+	config := testConfig(t)
+	defer os.Remove(config["command"].(string))
 
 	hostkey_file, err := ioutil.TempFile("", "hostkey")
 	if err != nil {
@@ -187,7 +206,8 @@ func TestProvisionerPrepare_AuthorizedKeyFile(t *testing.T) {
 
 func TestProvisionerPrepare_LocalPort(t *testing.T) {
 	var p Provisioner
-	config := testConfig()
+	config := testConfig(t)
+	defer os.Remove(config["command"].(string))
 
 	hostkey_file, err := ioutil.TempFile("", "hostkey")
 	if err != nil {