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package wclayer
import (
"context"
"strings"
"github.com/Microsoft/hcsshim/internal/hcserror"
"github.com/Microsoft/hcsshim/internal/oc"
"go.opencensus.io/trace"
)
// 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(ctx context.Context, path string, parentLayerPaths []string) (err error) {
title := "hcsshim::CreateScratchLayer"
ctx, span := trace.StartSpan(ctx, title)
defer span.End()
defer func() { oc.SetSpanStatus(span, err) }()
span.AddAttributes(
trace.StringAttribute("path", path),
trace.StringAttribute("parentLayerPaths", strings.Join(parentLayerPaths, ", ")))
// Generate layer descriptors
layers, err := layerPathsToDescriptors(ctx, parentLayerPaths)
if err != nil {
return err
}
err = createSandboxLayer(&stdDriverInfo, path, 0, layers)
if err != nil {
return hcserror.New(err, title+" - failed", "")
}
return nil
}
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