add scaffolding for the new packer command layout

command/cli.go

@@ -0,0 +1,128 @@
+package command
+
+import (
+	"flag"
+	"math"
+
+	"github.com/hashicorp/packer/helper/enumflag"
+	kvflag "github.com/hashicorp/packer/helper/flag-kv"
+	sliceflag "github.com/hashicorp/packer/helper/flag-slice"
+)
+
+// NewMetaArgs parses cli args and put possible values
+func (ma *MetaArgs) AddFlagSets(fs *flag.FlagSet) {
+	fs.Var((*sliceflag.StringFlag)(&ma.Only), "only", "")
+	fs.Var((*sliceflag.StringFlag)(&ma.Except), "except", "")
+	fs.Var((*kvflag.Flag)(&ma.Vars), "var", "")
+	fs.Var((*kvflag.StringSlice)(&ma.VarFiles), "var-file", "")
+}
+
+// MetaArgs defines commonalities between all comands
+type MetaArgs struct {
+	Args         []string
+	Only, Except []string
+	Vars         map[string]string
+	VarFiles     []string
+}
+
+func (ba *BuildArgs) AddFlagSets(flags *flag.FlagSet) {
+	flags.BoolVar(&ba.Color, "color", true, "")
+	flags.BoolVar(&ba.Debug, "debug", false, "")
+	flags.BoolVar(&ba.Force, "force", false, "")
+	flags.BoolVar(&ba.TimestampUi, "timestamp-ui", false, "")
+	flags.BoolVar(&ba.MachineReadable, "machine-readable", false, "")
+
+	flags.Int64Var(&ba.ParallelBuilds, "parallel-builds", 0, "")
+
+	flagOnError := enumflag.New(&ba.OnError, "cleanup", "abort", "ask")
+	flags.Var(flagOnError, "on-error", "")
+
+	ba.MetaArgs.AddFlagSets(flags)
+}
+
+func (ba *BuildArgs) ParseArgvs(args []string) int {
+	flags := flag.NewFlagSet("build", flag.ContinueOnError)
+	ba.AddFlagSets(flags)
+	err := flags.Parse(args)
+	if err != nil {
+		return 1
+	}
+
+	if ba.ParallelBuilds < 1 {
+		ba.ParallelBuilds = math.MaxInt64
+	}
+
+	ba.Args = flags.Args()
+	return 0
+}
+
+// BuildArgs represents a parsed cli line for a `packer build`
+type BuildArgs struct {
+	MetaArgs
+	Color, Debug, Force, TimestampUi, MachineReadable bool
+	ParallelBuilds                                    int64
+	OnError                                           string
+}
+
+func (ca *ConsoleArgs) ParseArgvs(args []string) int {
+	flags := flag.NewFlagSet("console", flag.ContinueOnError)
+	ca.AddFlagSets(flags)
+	err := flags.Parse(args)
+	if err != nil {
+		return 1
+	}
+
+	ca.Args = flags.Args()
+	return 0
+}
+
+// ConsoleArgs represents a parsed cli line for a `packer console`
+type ConsoleArgs struct{ MetaArgs }
+
+func (fa *FixArgs) AddFlagSets(flags *flag.FlagSet) {
+	flags.BoolVar(&fa.Validate, "validate", true, "")
+
+	fa.MetaArgs.AddFlagSets(flags)
+}
+
+func (fa *FixArgs) ParseArgvs(args []string) int {
+	flags := flag.NewFlagSet("build", flag.ContinueOnError)
+	fa.AddFlagSets(flags)
+	err := flags.Parse(args)
+	if err != nil {
+		return 1
+	}
+
+	fa.Args = flags.Args()
+	return 0
+}
+
+// FixArgs represents a parsed cli line for a `packer fix`
+type FixArgs struct {
+	MetaArgs
+	Validate bool
+}
+
+func (va *ValidateArgs) AddFlagSets(flags *flag.FlagSet) {
+	flags.BoolVar(&va.SyntaxOnly, "syntax-only", true, "")
+
+	va.MetaArgs.AddFlagSets(flags)
+}
+
+func (va *ValidateArgs) ParseArgvs(args []string) int {
+	flags := flag.NewFlagSet("build", flag.ContinueOnError)
+	va.AddFlagSets(flags)
+	err := flags.Parse(args)
+	if err != nil {
+		return 1
+	}
+
+	va.Args = flags.Args()
+	return 0
+}
+
+// ValidateArgs represents a parsed cli line for a `packer validate`
+type ValidateArgs struct {
+	MetaArgs
+	SyntaxOnly bool
+}

command/command.go

@@ -0,0 +1,13 @@
+package command
+
+import "context"
+
+// PackerInterface is the interface to use packer; it represents ways users can
+// use Packer. A call returns a int that will be the exit code of Packer,
+// everything else is up to the implementer.
+type PackerInterface interface {
+	Build(ctx context.Context, args BuildArgs) int
+	Console(ctx context.Context, args ConsoleArgs) int
+	Fix(ctx context.Context, args FixArgs) int
+	Validate(ctx context.Context, args ValidateArgs) int
+}