What causes "failed to copy content to container: %w" in nektos/act?

Check the wrapped Docker error for the copy failure cause (permissions, stopped container, disk space).

failed to copy content to container: %w

Error message

failed to copy content to container: %w

What it means

Error "failed to copy content to container: %w" thrown in nektos/act.

Source

Thrown at pkg/container/docker_run.go:729

// Copy Content
_, err = cr.cli.CopyToContainer(ctx, cr.id, client.CopyToContainerOptions{DestinationPath: destPath, Content: tarStream})
if err != nil {
	return fmt.Errorf("failed to copy content to container: %w", err)
}

View on GitHub (pinned to 4f41128141)

Solutions

Check the wrapped Docker error for the copy failure cause (permissions, stopped container, disk space).
Ensure the source content path exists on the host and is readable.

When it happens

Trigger: Thrown at pkg/container/docker_run.go:729 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nektos/act@4f41128141 (2026-08-15). Data as JSON: /api/errors/b981edf34ec9ed31. Report an issue: GitHub.