buildkit/vendor/github.com/Microsoft/hcsshim/computestorage/export.go

//go:build windows

package computestorage

import (
	"context"
	"encoding/json"
	"go.opentelemetry.io/otel/attribute"

	"github.com/Microsoft/hcsshim/internal/ot"
	"github.com/pkg/errors"
)

// ExportLayer exports a container layer.
//
// `layerPath` is a path to a directory containing the layer to export.
//
// `exportFolderPath` is a pre-existing folder to export the layer to.
//
// `layerData` is the parent layer data.
//
// `options` are the export options applied to the exported layer.
func ExportLayer(ctx context.Context, layerPath, exportFolderPath string, layerData LayerData, options ExportLayerOptions) (err error) {
	title := "hcsshim::ExportLayer"
	ctx, span := ot.StartSpan(ctx, title) //nolint:ineffassign,staticcheck
	defer span.End()
	defer func() { ot.SetSpanStatus(span, err) }()
	span.SetAttributes(
		attribute.String("layerPath", layerPath),
		attribute.String("exportFolderPath", exportFolderPath),
	)

	ldBytes, err := json.Marshal(layerData)
	if err != nil {
		return err
	}

	oBytes, err := json.Marshal(options)
	if err != nil {
		return err
	}

	err = hcsExportLayer(layerPath, exportFolderPath, string(ldBytes), string(oBytes))
	if err != nil {
		return errors.Wrap(err, "failed to export layer")
	}
	return nil
}