Windows: Updates Windows Vendoring

Updates windows dependent libraries for vendoing.

vendor/github.com/Microsoft/hcsshim/cmd/wclayer/export.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"compress/gzip"
+	"io"
+	"os"
+	"path/filepath"
+
+	winio "github.com/Microsoft/go-winio"
+	"github.com/Microsoft/hcsshim/internal/appargs"
+	"github.com/Microsoft/hcsshim/internal/ociwclayer"
+	"github.com/urfave/cli"
+)
+
+var exportCommand = cli.Command{
+	Name:  "export",
+	Usage: "exports a layer to a tar file",
+	Flags: []cli.Flag{
+		cli.StringSliceFlag{
+			Name:  "layer, l",
+			Usage: "paths to the read-only parent layers",
+		},
+		cli.StringFlag{
+			Name:  "output, o",
+			Usage: "output layer tar (defaults to stdout)",
+		},
+		cli.BoolFlag{
+			Name:  "gzip, z",
+			Usage: "compress output with gzip compression",
+		},
+	},
+	ArgsUsage: "<layer path>",
+	Before:    appargs.Validate(appargs.NonEmptyString),
+	Action: func(context *cli.Context) (err error) {
+		path, err := filepath.Abs(context.Args().First())
+		if err != nil {
+			return err
+		}
+
+		layers, err := normalizeLayers(context.StringSlice("layer"), true)
+		if err != nil {
+			return err
+		}
+
+		err = winio.EnableProcessPrivileges([]string{winio.SeBackupPrivilege})
+		if err != nil {
+			return err
+		}
+
+		fp := context.String("output")
+		f := os.Stdout
+		if fp != "" {
+			f, err = os.Create(fp)
+			if err != nil {
+				return err
+			}
+			defer f.Close()
+		}
+		w := io.Writer(f)
+		if context.Bool("gzip") {
+			w = gzip.NewWriter(w)
+		}
+
+		return ociwclayer.ExportLayer(w, path, layers)
+	},
+}