Container changes (#320)

Added container metrics

vendor/github.com/Microsoft/hcsshim/cmd/tar2ext4/tar2ext4.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+
+	"github.com/Microsoft/hcsshim/ext4/tar2ext4"
+)
+
+var (
+	input      = flag.String("i", "", "input file")
+	output     = flag.String("o", "", "output file")
+	overlay    = flag.Bool("overlay", false, "produce overlayfs-compatible layer image")
+	vhd        = flag.Bool("vhd", false, "add a VHD footer to the end of the image")
+	inlineData = flag.Bool("inline", false, "write small file data into the inode; not compatible with DAX")
+)
+
+func main() {
+	flag.Parse()
+	if flag.NArg() != 0 || len(*output) == 0 {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	err := func() (err error) {
+		in := os.Stdin
+		if *input != "" {
+			in, err = os.Open(*input)
+			if err != nil {
+				return err
+			}
+		}
+		out, err := os.Create(*output)
+		if err != nil {
+			return err
+		}
+
+		var opts []tar2ext4.Option
+		if *overlay {
+			opts = append(opts, tar2ext4.ConvertWhiteout)
+		}
+		if *vhd {
+			opts = append(opts, tar2ext4.AppendVhdFooter)
+		}
+		if *inlineData {
+			opts = append(opts, tar2ext4.InlineData)
+		}
+		err = tar2ext4.Convert(in, out, opts...)
+		if err != nil {
+			return err
+		}
+
+		// Exhaust the tar stream.
+		io.Copy(ioutil.Discard, in)
+		return nil
+	}()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}