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package computestorage
import (
"context"
"encoding/json"
"fmt"
"github.com/Microsoft/hcsshim/internal/oc"
"go.opencensus.io/trace"
)
// AttachLayerStorageFilter sets up the layer storage filter on a writable
// container layer.
//
// `layerPath` is a path to a directory the writable layer is mounted. If the
// path does not end in a `\` the platform will append it automatically.
//
// `layerData` is the parent read-only layer data.
func AttachLayerStorageFilter(ctx context.Context, layerPath string, layerData LayerData) (err error) {
title := "hcsshim.AttachLayerStorageFilter"
ctx, span := trace.StartSpan(ctx, title)
defer span.End()
defer func() { oc.SetSpanStatus(span, err) }()
span.AddAttributes(
trace.StringAttribute("layerPath", layerPath),
)
bytes, err := json.Marshal(layerData)
if err != nil {
return err
}
err = hcsAttachLayerStorageFilter(layerPath, string(bytes))
if err != nil {
return fmt.Errorf("failed to attach layer storage filter: %s", err)
}
return nil
}
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