move command implementations to internal/

main.go

@@ -1,18 +1,16 @@
 package main
 
 import (
-	"errors"
 	"os"
 
 	goflags "github.com/jessevdk/go-flags"
-	"github.com/motiejus/code/undocker/rootfs"
-	"go.uber.org/multierr"
+	"github.com/motiejus/code/undocker/internal/cmdrootfs"
 )
 
 type (
 	params struct {
-		RootFS   cmdRootFS   `command:"rootfs" description:"Unpack a docker container image to a single filesystem tarball"`
-		Manifest cmdManifest `command:"manifest"`
+		RootFS   cmdrootfs.CmdRootFS `command:"rootfs" description:"Unpack a docker container image to a single filesystem tarball"`
+		Manifest cmdManifest         `command:"manifest"`
 	}
 
 	cmdManifest struct{} // stub
@@ -33,36 +31,3 @@ func run(args []string) error {
 
 	return nil
 }
-
-type cmdRootFS struct {
-	PositionalArgs struct {
-		Infile  goflags.Filename `long:"infile" description:"Input tarball"`
-		Outfile string           `long:"outfile" description:"Output path, stdout is '-'"`
-	} `positional-args:"yes" required:"yes"`
-}
-
-func (r *cmdRootFS) Execute(args []string) (err error) {
-	if len(args) != 0 {
-		return errors.New("too many args")
-	}
-
-	in, err := os.Open(string(r.PositionalArgs.Infile))
-	if err != nil {
-		return err
-	}
-	defer func() { err = multierr.Append(err, in.Close()) }()
-
-	var out *os.File
-	outf := string(r.PositionalArgs.Outfile)
-	if outf == "-" {
-		out = os.Stdout
-	} else {
-		out, err = os.Create(outf)
-		if err != nil {
-			return err
-		}
-	}
-	defer func() { err = multierr.Append(err, out.Close()) }()
-
-	return rootfs.RootFS(in, out)
-}