Replace boot command parser with PEG parser.

Makefile

@@ -42,6 +42,7 @@ package:
 
 deps:
 	@go get golang.org/x/tools/cmd/stringer
+	@go get -u github.com/mna/pigeon
 	@go get github.com/kardianos/govendor
 	@govendor sync
 
@@ -73,6 +74,8 @@ fmt-examples:
 # source files.
 generate: deps ## Generate dynamically generated code
 	go generate .
+	gofmt -w common/bootcommand/boot_command.go
+	goimports -w common/bootcommand/boot_command.go
 	gofmt -w command/plugin.go
 
 test: deps fmt-check ## Run unit tests

builder/hyperv/common/step_run.go

@@ -3,15 +3,12 @@ package common
 import (
 	"context"
 	"fmt"
-	"time"
 
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
 )
 
 type StepRun struct {
-	BootWait time.Duration
-
 	vmName string
 }
 
@@ -32,22 +29,6 @@ func (s *StepRun) Run(_ context.Context, state multistep.StateBag) multistep.Ste
 
 	s.vmName = vmName
 
-	if int64(s.BootWait) > 0 {
-		ui.Say(fmt.Sprintf("Waiting %s for boot...", s.BootWait))
-		wait := time.After(s.BootWait)
-	WAITLOOP:
-		for {
-			select {
-			case <-wait:
-				break WAITLOOP
-			case <-time.After(1 * time.Second):
-				if _, ok := state.GetOk(multistep.StateCancelled); ok {
-					return multistep.ActionHalt
-				}
-			}
-		}
-	}
-
 	return multistep.ActionContinue
 }