fix to work with hcl2; update tests

builder/vsphere/clone/builder.go

@@ -19,12 +19,12 @@ type Builder struct {
 func (b *Builder) ConfigSpec() hcldec.ObjectSpec { return b.config.FlatMapstructure().HCL2Spec() }
 
 func (b *Builder) Prepare(raws ...interface{}) ([]string, []string, error) {
-	warnings, errs := b.config.Prepare()
+	warnings, errs := b.config.Prepare(raws...)
 	if errs != nil {
-		return warnings, nil, errs
+		return nil, warnings, errs
 	}
 
-	return warnings, nil, nil
+	return nil, warnings, nil
 }
 
 func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (packer.Artifact, error) {

builder/vsphere/clone/config_test.go

@@ -6,7 +6,8 @@ import (
 )
 
 func TestCloneConfig_MinimalConfig(t *testing.T) {
-	_, warns, errs := NewConfig(minimalConfig())
+	c := new(Config)
+	warns, errs := c.Prepare(minimalConfig())
 	testConfigOk(t, warns, errs)
 }
 
@@ -15,7 +16,8 @@ func TestCloneConfig_MandatoryParameters(t *testing.T) {
 	for _, param := range params {
 		raw := minimalConfig()
 		raw[param] = ""
-		_, warns, err := NewConfig(raw)
+		c := new(Config)
+		warns, err := c.Prepare(raw)
 		testConfigErr(t, param, warns, err)
 	}
 }
@@ -23,7 +25,8 @@ func TestCloneConfig_MandatoryParameters(t *testing.T) {
 func TestCloneConfig_Timeout(t *testing.T) {
 	raw := minimalConfig()
 	raw["shutdown_timeout"] = "3m"
-	conf, warns, err := NewConfig(raw)
+	conf := new(Config)
+	warns, err := conf.Prepare(raw)
 	testConfigOk(t, warns, err)
 	if conf.ShutdownConfig.Timeout != 3*time.Minute {
 		t.Fatalf("shutdown_timeout sould be equal 3 minutes, got %v", conf.ShutdownConfig.Timeout)
@@ -34,7 +37,8 @@ func TestCloneConfig_RAMReservation(t *testing.T) {
 	raw := minimalConfig()
 	raw["RAM_reservation"] = 1000
 	raw["RAM_reserve_all"] = true
-	_, warns, err := NewConfig(raw)
+	c := new(Config)
+	warns, err := c.Prepare(raw)
 	testConfigErr(t, "RAM_reservation", warns, err)
 }
 

builder/vsphere/iso/builder.go

@@ -2,6 +2,7 @@ package iso
 
 import (
 	"context"
+
 	"github.com/hashicorp/hcl/v2/hcldec"
 	"github.com/hashicorp/packer/builder/vsphere/common"
 	"github.com/hashicorp/packer/builder/vsphere/driver"
@@ -19,12 +20,12 @@ type Builder struct {
 func (b *Builder) ConfigSpec() hcldec.ObjectSpec { return b.config.FlatMapstructure().HCL2Spec() }
 
 func (b *Builder) Prepare(raws ...interface{}) ([]string, []string, error) {
-	warnings, errs := b.config.Prepare()
+	warnings, errs := b.config.Prepare(raws...)
 	if errs != nil {
-		return warnings, nil, errs
+		return nil, warnings, errs
 	}
 
-	return warnings, nil, nil
+	return nil, warnings, nil
 }
 
 func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (packer.Artifact, error) {

builder/vsphere/iso/config.go

@@ -74,8 +74,8 @@ func (c *Config) Prepare(raws ...interface{}) ([]string, error) {
 	errs = packer.MultiErrorAppend(errs, c.ShutdownConfig.Prepare()...)
 
 	if len(errs.Errors) > 0 {
-		return nil, errs
+		return warnings, errs
 	}
 
-	return nil, nil
+	return warnings, nil
 }

helper/config/decode.go

@@ -3,6 +3,7 @@ package config
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"reflect"
 	"sort"
 	"strings"
@@ -158,6 +159,9 @@ func DetectContextData(raws ...interface{}) (map[interface{}]interface{}, []inte
 	// In provisioners, the last value pulled from raws is the placeholder data
 	// for build-specific variables. Pull these out to add to interpolation
 	// context.
+	if len(raws) == 0 {
+		return nil, raws
+	}
 
 	// Internally, our tests may cause this to be read as a map[string]string
 	placeholderData := raws[len(raws)-1]
@@ -201,6 +205,7 @@ func DetectContext(raws ...interface{}) (*interpolate.Context, error) {
 
 	for _, r := range raws {
 		if err := mapstructure.Decode(r, &s); err != nil {
+			log.Printf("Error detecting context: %s", err)
 			return nil, err
 		}
 	}