GoogleContainerTools/skaffold · error

unable to create directory %q: %w

Error message

unable to create directory %q: %w

What it means

The v2 event package's SaveEventsToFile mirrors the v1 behavior: it creates the target directory with os.MkdirAll(dir, 0700) before opening the file, wrapping failures as 'unable to create directory %q'. Identical causes and fixes as the v1 variant, but events come from the v2 event log.

Source

Thrown at pkg/skaffold/event/v2/event.go:318

				if x.Namespace != de.Namespace || x.PodName != de.PodName || x.ContainerName != de.ContainerName {
					ev.state.DebuggingContainers[n] = x
					n++
				}
			}
			ev.state.DebuggingContainers = ev.state.DebuggingContainers[:n]
		}
		ev.stateLock.Unlock()
	}
	ev.logEvent(event)
}

// SaveEventsToFile saves the current event log to the filepath provided
func SaveEventsToFile(fp string) error {
	handler.logLock.Lock()
	// Ensure that the filepath provided has the directories available when attemping to save the file.
	dir := filepath.Dir(fp)
	if err := os.MkdirAll(dir, 0700); err != nil {
		return fmt.Errorf("unable to create directory %q: %w", dir, err)
	}
	f, err := os.OpenFile(fp, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
	if err != nil {
		return fmt.Errorf("opening %s: %w", fp, err)
	}
	defer f.Close()
	marshaller := jsonpb.Marshaler{}
	for _, ev := range handler.eventLog {
		contents := bytes.NewBuffer([]byte{})
		if err := marshaller.Marshal(contents, ev); err != nil {
			return fmt.Errorf("marshalling event: %w", err)
		}
		if _, err := f.WriteString(contents.String() + "\n"); err != nil {
			return fmt.Errorf("writing string: %w", err)
		}
	}
	handler.logLock.Unlock()
	return nil

View on GitHub (pinned to a1189de023)

Solutions

1. Verify no regular file exists at any directory segment of the target path
2. Ensure the current user has write permission on the nearest existing parent (chmod/chown or choose another location)
3. Target a writable directory such as os.TempDir() or a mounted volume
4. Read the wrapped syscall error (EACCES/ENOTDIR/EROFS) to identify the failing component

Example fix

// before
v2event.SaveEventsToFile("/sys/fs/cgroup/skaffold/events.json")
// after
v2event.SaveEventsToFile(filepath.Join(os.TempDir(), "skaffold-v2-events.json"))

dir := filepath.Dir(fp)
if info, err := os.Stat(dir); err == nil && !info.IsDir() {
    return fmt.Errorf("%s blocks v2 event log directory", dir)
}
if err := os.MkdirAll(dir, 0700); err != nil {
    return fmt.Errorf("cannot prepare v2 event log dir %q: %w", dir, err)
}

if err := v2event.SaveEventsToFile(fp); err != nil {
    var pErr *fs.PathError
    if errors.As(err, &pErr) && (errors.Is(pErr.Err, fs.ErrPermission) || errors.Is(pErr.Err, syscall.EROFS)) {
        log.Warnf("v2 event log destination unusable: %v", err)
        return nil
    }
    return err
}

When it happens

Trigger: Calling pkg/skaffold/event/v2 SaveEventsToFile with a filepath whose parent directories cannot be created: no write permission, a file blocking a path component, read-only filesystem, or invalid path characters.

Common situations: Pointing the v2 event log at a read-only mount or another user's home directory; a stale regular file occupying the intended directory path; CI runners with sanitized /tmp permissions.

Understand the failure class

Background: Permission denied / not authorized / 403 Forbidden: access-control rejections when the caller lacks the required role, grant, or ownership — this error's family across 18 libraries.

Related errors

• unable to create directory %q: %w
• opening %s: %w
• opening %s: %w
• writing string: %w
• writing string: %w

AI-assisted analysis of GoogleContainerTools/skaffold@a1189de023 (2026-09-05). Data as JSON: /api/errors/f31f49bb012dafdb. Report an issue: GitHub.