fixup! Add boot steps configuration option

builder/qemu/config.go

@@ -520,6 +520,45 @@ type Config struct {
 	//  * ARM: tpm-tis-device
 	//  * PPC (p-series): tpm-spapr
 	TPMType string `mapstructure:"tpm_device_type" required:"false"`
+	// This is an array of tuples of boot commands, to type when the virtual
+	// machine is booted. The first element of the tuple is the actual boot
+	// command. The second element of the tuple, which is optional, is a
+	// description of what the boot command does. This is intended to be used for
+	// interactive installers that requires many commands to complete the
+	// installation. Both the command and the description will be printed when
+	// logging is enabled. When debug mode is enabled Packer will pause after
+	// typing each boot command. This will make it easier to follow along the
+	// installation process and make sure the Packer and the installer are in
+	// sync. `boot_steps` and `boot_commands` are mutually exclusive.
+	//
+	// Example:
+	//
+	// In HCL:
+	// ```hcl
+	// boot_steps = [
+	//   ["1<enter><wait5>", "Install NetBSD"],
+	//   ["a<enter><wait5>", "Installation messages in English"],
+	//   ["a<enter><wait5>", "Keyboard type: unchanged"],
+	//
+	//   ["a<enter><wait5>", "Install NetBSD to hard disk"],
+	//   ["b<enter><wait5>", "Yes"]
+	// ]
+	// ```
+	//
+	// In JSON:
+	// ```json
+	// {
+	//   "boot_steps": [
+	//     ["1<enter><wait5>", "Install NetBSD"],
+	//     ["a<enter><wait5>", "Installation messages in English"],
+	//     ["a<enter><wait5>", "Keyboard type: unchanged"],
+	//
+	//     ["a<enter><wait5>", "Install NetBSD to hard disk"],
+	//     ["b<enter><wait5>", "Yes"]
+	//   ]
+	// }
+	// ```
+	BootSteps [][]string `mapstructure:"boot_steps" required:"false"`
 
 	// TODO(mitchellh): deprecate
 	RunOnce bool `mapstructure:"run_once"`

builder/qemu/step_type_boot_command.go

@@ -35,10 +35,17 @@ type bootCommandTemplateData struct {
 type stepTypeBootCommand struct{}
 
 func (s *stepTypeBootCommand) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
+	ui := state.Get("ui").(packersdk.Ui)
 	config := state.Get("config").(*Config)
 	command := config.VNCConfig.FlatBootCommand()
 	bootSteps := config.BootSteps
 
+	if len(command) > 0 && len(bootSteps) > 0 {
+		err := fmt.Errorf("Both boot command and boot steps cannot be used.")
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
 	if len(command) > 0 {
 		bootSteps = [][]string{{command}}
 	}

docs-partials/builder/qemu/Config-not-required.mdx

@@ -350,4 +350,43 @@
    * ARM: tpm-tis-device
    * PPC (p-series): tpm-spapr
 
+- `boot_steps` ([][]string) - This is an array of tuples of boot commands, to type when the virtual
+  machine is booted. The first element of the tuple is the actual boot
+  command. The second element of the tuple, which is optional, is a
+  description of what the boot command does. This is intended to be used for
+  interactive installers that requires many commands to complete the
+  installation. Both the command and the description will be printed when
+  logging is enabled. When debug mode is enabled Packer will pause after
+  typing each boot command. This will make it easier to follow along the
+  installation process and make sure the Packer and the installer are in
+  sync. `boot_steps` and `boot_commands` are mutually exclusive.
+  
+  Example:
+  
+  In HCL:
+  ```hcl
+  boot_steps = [
+    ["1<enter><wait5>", "Install NetBSD"],
+    ["a<enter><wait5>", "Installation messages in English"],
+    ["a<enter><wait5>", "Keyboard type: unchanged"],
+
+    ["a<enter><wait5>", "Install NetBSD to hard disk"],
+    ["b<enter><wait5>", "Yes"]
+  ]
+  ```
+  
+  In JSON:
+  ```json
+  {
+    "boot_steps": [
+      ["1<enter><wait5>", "Install NetBSD"],
+      ["a<enter><wait5>", "Installation messages in English"],
+      ["a<enter><wait5>", "Keyboard type: unchanged"],
+
+      ["a<enter><wait5>", "Install NetBSD to hard disk"],
+      ["b<enter><wait5>", "Yes"]
+    ]
+  }
+  ```
+
 <!-- End of code generated from the comments of the Config struct in builder/qemu/config.go; -->