k3s/vendor/github.com/Microsoft/hcsshim/internal/wclayer/createscratchlayer.go

package wclayer

import (
	"github.com/Microsoft/hcsshim/internal/hcserror"
	"github.com/sirupsen/logrus"
)

// CreateScratchLayer creates and populates new read-write layer for use by a container.
// This requires both the id of the direct parent layer, as well as the full list
// of paths to all parent layers up to the base (and including the direct parent
// whose id was provided).
func CreateScratchLayer(path string, parentLayerPaths []string) error {
	title := "hcsshim::CreateScratchLayer "
	logrus.Debugf(title+"path %s", path)

	// Generate layer descriptors
	layers, err := layerPathsToDescriptors(parentLayerPaths)
	if err != nil {
		return err
	}

	err = createSandboxLayer(&stdDriverInfo, path, 0, layers)
	if err != nil {
		err = hcserror.Errorf(err, title, "path=%s", path)
		logrus.Error(err)
		return err
	}

	logrus.Debugf(title+"- succeeded path=%s", path)
	return nil
}