package wclayer import ( "context" "github.com/Microsoft/hcsshim/internal/hcserror" "github.com/Microsoft/hcsshim/internal/oc" "go.opencensus.io/trace" ) // LayerExists will return true if a layer with the given id exists and is known // to the system. func LayerExists(ctx context.Context, path string) (_ bool, err error) { title := "hcsshim::LayerExists" ctx, span := trace.StartSpan(ctx, title) defer span.End() defer func() { oc.SetSpanStatus(span, err) }() span.AddAttributes(trace.StringAttribute("path", path)) // Call the procedure itself. var exists uint32 err = layerExists(&stdDriverInfo, path, &exists) if err != nil { return false, hcserror.New(err, title+" - failed", "") } span.AddAttributes(trace.BoolAttribute("layer-exists", exists != 0)) return exists != 0, nil }