Container changes (#320)

Added container metrics

vendor/github.com/Microsoft/hcsshim/internal/wcow/scratch.go

@@ -0,0 +1,26 @@
+package wcow
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/Microsoft/hcsshim/internal/copyfile"
+	"github.com/Microsoft/hcsshim/internal/wclayer"
+	"github.com/sirupsen/logrus"
+)
+
+// CreateUVMScratch is a helper to create a scratch for a Windows utility VM
+// with permissions to the specified VM ID in a specified directory
+func CreateUVMScratch(imagePath, destDirectory, vmID string) error {
+	sourceScratch := filepath.Join(imagePath, `UtilityVM\SystemTemplate.vhdx`)
+	targetScratch := filepath.Join(destDirectory, "sandbox.vhdx")
+	logrus.Debugf("uvm::CreateUVMScratch %s from %s", targetScratch, sourceScratch)
+	if err := copyfile.CopyFile(sourceScratch, targetScratch, true); err != nil {
+		return err
+	}
+	if err := wclayer.GrantVmAccess(vmID, targetScratch); err != nil {
+		os.Remove(targetScratch)
+		return err
+	}
+	return nil
+}