grafana/k6 · error

creating a local directory %q: %w

Error message

creating a local directory %q: %w

What it means

Error "creating a local directory %q: %w" thrown in grafana/k6.

Source

Thrown at internal/js/modules/k6/browser/storage/file_persister.go:29

	"mime/multipart"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"
)

// LocalFilePersister will persist files to the local disk.
type LocalFilePersister struct{}

// Persist will write the contents of data to the local disk on the specified path.
// TODO: we should not write to disk here but put it on some queue for async disk writes.
func (l *LocalFilePersister) Persist(_ context.Context, path string, data io.Reader) (err error) {
	cp := filepath.Clean(path)

	dir := filepath.Dir(cp)
	if err = os.MkdirAll(dir, 0o755); err != nil { //nolint:forbidigo,gosec
		return fmt.Errorf("creating a local directory %q: %w", dir, err)
	}

	f, err := os.OpenFile(cp, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o600) //nolint:forbidigo
	if err != nil {
		return fmt.Errorf("creating a local file %q: %w", cp, err)
	}
	defer func() {
		if cerr := f.Close(); cerr != nil && err == nil {
			err = fmt.Errorf("closing the local file %q: %w", cp, cerr)
		}
	}()

	bf := bufio.NewWriter(f)

	if _, err := io.Copy(bf, data); err != nil {
		return fmt.Errorf("copying data to file: %w", err)
	}

View on GitHub (pinned to 93accf6570)

When it happens

Trigger: Thrown at internal/js/modules/k6/browser/storage/file_persister.go:29 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/58e3daeaaff82912. Report an issue: GitHub.