[WIP] add encoding support for powershell

provisioner/powershell/provisioner.go

@@ -29,6 +29,10 @@ import (
 	"github.com/hashicorp/packer-plugin-sdk/template/interpolate"
 	"github.com/hashicorp/packer-plugin-sdk/tmp"
 	"github.com/hashicorp/packer-plugin-sdk/uuid"
+	"golang.org/x/text/encoding"
+	"golang.org/x/text/encoding/charmap"
+	"golang.org/x/text/encoding/unicode"
+	"golang.org/x/text/transform"
 )
 
 var psEscape = strings.NewReplacer(
@@ -95,6 +99,10 @@ type Config struct {
 	// Run pwsh.exe instead of powershell.exe - latest version of powershell.
 	UsePwsh bool `mapstructure:"use_pwsh"`
 
+	// The encoding of the script file. This is used to set the encoding of the powershell file that gets written by
+	//packer. The default is UTF-8.
+	FileEncoding string `mapstructure:"file_encoding"`
+
 	ctx interpolate.Context
 }
 
@@ -126,6 +134,21 @@ func (p *Provisioner) defaultExecuteCommand() string {
 
 }
 
+func (p *Provisioner) getEncoding() encoding.Encoding {
+	encName := p.config.FileEncoding
+
+	switch encName {
+	case "utf-16":
+		return unicode.UTF16(unicode.LittleEndian, unicode.UseBOM)
+	case "iso-8859-1":
+		return charmap.ISO8859_1
+	case "windows-1252":
+		return charmap.Windows1252
+	default:
+		return unicode.UTF8 // Fallback to UTF-8
+	}
+}
+
 func (p *Provisioner) ConfigSpec() hcldec.ObjectSpec { return p.config.FlatMapstructure().HCL2Spec() }
 
 func (p *Provisioner) Prepare(raws ...interface{}) error {
@@ -255,7 +278,9 @@ func extractScript(p *Provisioner) (string, error) {
 		return "", err
 	}
 	defer temp.Close()
-	writer := bufio.NewWriter(temp)
+	enc := p.getEncoding()
+	log.Printf("Using encoding: %s", enc)
+	writer := bufio.NewWriter(transform.NewWriter(temp, enc.NewEncoder()))
 	for _, command := range p.config.Inline {
 		log.Printf("Found command: %s", command)
 		if _, err := writer.WriteString(command + "\n"); err != nil {

provisioner/powershell/provisioner.hcl2spec.go

@@ -39,6 +39,7 @@ type FlatConfig struct {
 	DebugMode              *int              `mapstructure:"debug_mode" cty:"debug_mode" hcl:"debug_mode"`
 	PauseAfter             *string           `mapstructure:"pause_after" cty:"pause_after" hcl:"pause_after"`
 	UsePwsh                *bool             `mapstructure:"use_pwsh" cty:"use_pwsh" hcl:"use_pwsh"`
+	FileEncoding           *string           `mapstructure:"file_encoding" cty:"file_encoding" hcl:"file_encoding"`
 }
 
 // FlatMapstructure returns a new FlatConfig.
@@ -82,6 +83,7 @@ func (*FlatConfig) HCL2Spec() map[string]hcldec.Spec {
 		"debug_mode":                 &hcldec.AttrSpec{Name: "debug_mode", Type: cty.Number, Required: false},
 		"pause_after":                &hcldec.AttrSpec{Name: "pause_after", Type: cty.String, Required: false},
 		"use_pwsh":                   &hcldec.AttrSpec{Name: "use_pwsh", Type: cty.Bool, Required: false},
+		"file_encoding":              &hcldec.AttrSpec{Name: "file_encoding", Type: cty.String, Required: false},
 	}
 	return s
 }