provisioner/chef-solo: properly escape user vars for JSON

/cc @mwhooker - I moved the processing up into Prepare so that any
errors will be shown during a validate pass. Also, I escape some stuff
in keys. Tests moved as well.

packer/config_template_test.go

 package packer
 
 import (
+	"encoding/json"
 	"math"
 	"strconv"
 	"testing"
 	"time"
-	"encoding/json"
 )
 
 func TestConfigTemplateProcess_timestamp(t *testing.T) {
@@ -48,39 +48,6 @@ func TestConfigTemplateProcess_user(t *testing.T) {
 	}
 }
 
-func TestJsonTemplateProcess_user(t *testing.T) {
-	tpl, err := NewConfigTemplate()
-	if err != nil {
-		t.Fatalf("err: %s", err)
-	}
-
-	tpl.UserVars["foo"] = "bar"
-	jsonData := make(map[string]interface{})
-	jsonData["key"] = map[string]string{
-	    "key1": "{{user `foo`}}",
-	}
-	jsonBytes, err := json.MarshalIndent(jsonData, "", "  ")
-	if err != nil {
-	    t.Fatalf("err: %s", err)
-	}
-	var jsonString = string(jsonBytes)
-
-	jsonString, err = tpl.Process(jsonString, nil)
-	if err != nil {
-		t.Fatalf("err: %s", err)
-	}
-	var dat map[string]map[string]interface{}
-	if err := json.Unmarshal([]byte(jsonString), &dat); err != nil {
-		t.Fatalf("err: %s", err)
-	}
-
-	if dat["key"]["key1"] != "bar" {
-	    t.Fatalf("found %s instead", dat["key"]["key1"])
-	}
-
-}
-
-
 func TestConfigTemplateValidate(t *testing.T) {
 	tpl, err := NewConfigTemplate()
 	if err != nil {

provisioner/chef-solo/provisioner.go

@@ -95,6 +95,7 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 	sliceTemplates := map[string][]string{
 		"cookbook_paths":        p.config.CookbookPaths,
 		"remote_cookbook_paths": p.config.RemoteCookbookPaths,
+		"run_list":              p.config.RunList,
 	}
 
 	for n, slice := range sliceTemplates {
@@ -129,6 +130,14 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 		}
 	}
 
+	// Process the user variables within the JSON and set the JSON.
+	// Do this early so that we can validate and show errors.
+	p.config.Json, err = p.processJsonUserVars()
+	if err != nil {
+		errs = packer.MultiErrorAppend(
+			errs, fmt.Errorf("Error processing user variables in JSON: %s", err))
+	}
+
 	if errs != nil && len(errs.Errors) > 0 {
 		return errs
 	}
@@ -136,6 +145,46 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 	return nil
 }
 
+func (p *Provisioner) processJsonUserVars() (map[string]interface{}, error) {
+	jsonBytes, err := json.Marshal(p.config.Json)
+	if err != nil {
+		// This really shouldn't happen since we literally just unmarshalled
+		panic(err)
+	}
+
+	// Copy the user variables so that we can restore them later, and
+	// make sure we make the quotes JSON-friendly in the user variables.
+	originalUserVars := make(map[string]string)
+	for k, v := range p.config.tpl.UserVars {
+		originalUserVars[k] = v
+	}
+
+	// Make sure we reset them no matter what
+	defer func() {
+		p.config.tpl.UserVars = originalUserVars
+	}()
+
+	// Make the current user variables JSON string safe.
+	for k, v := range p.config.tpl.UserVars {
+		v = strings.Replace(v, `\`, `\\`, -1)
+		v = strings.Replace(v, `"`, `\"`, -1)
+		p.config.tpl.UserVars[k] = v
+	}
+
+	// Process the bytes with the template processor
+	jsonBytesProcessed, err := p.config.tpl.Process(string(jsonBytes), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var result map[string]interface{}
+	if err := json.Unmarshal([]byte(jsonBytesProcessed), &result); err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}
+
 func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 	if !p.config.SkipInstall {
 		if err := p.installChef(ui, comm); err != nil {
@@ -236,14 +285,9 @@ func (p *Provisioner) createJson(ui packer.Ui, comm packer.Communicator) (string
 		return "", err
 	}
 
-	jsonBytesProcessed, err := p.config.tpl.Process(string(jsonBytes), nil)
-	if err != nil {
-		return "", err
-	}
-
 	// Upload the bytes
 	remotePath := filepath.Join(p.config.StagingDir, "node.json")
-	if err := comm.Upload(remotePath, bytes.NewReader([]byte(jsonBytesProcessed))); err != nil {
+	if err := comm.Upload(remotePath, bytes.NewReader(jsonBytes)); err != nil {
 		return "", err
 	}
 

provisioner/chef-solo/provisioner_test.go

@@ -51,3 +51,24 @@ func TestProvisionerPrepare_cookbookPaths(t *testing.T) {
 		t.Fatalf("unexpected: %#v", p.config.CookbookPaths)
 	}
 }
+
+func TestProvisionerPrepare_json(t *testing.T) {
+	config := testConfig()
+	config["json"] = map[string]interface{}{
+		"foo": "{{ user `foo` }}",
+	}
+
+	config[packer.UserVariablesConfigKey] = map[string]string{
+		"foo": `"bar\baz"`,
+	}
+
+	var p Provisioner
+	err := p.Prepare(config)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if p.config.Json["foo"] != `"bar\baz"` {
+		t.Fatalf("bad: %#v", p.config.Json)
+	}
+}