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When a CI container has an inner dockerd (DinD) writing to the container's overlay (e.g. 38 GB), image pulls fail with ENOSPC. start_docker.py now checks the daemon's free disk space and tries rootless sockets (which have access to the host's full filesystem) when the default socket has less than 20 GB free. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>