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download_to(staging_dir, update_package) verify_checksum(staging_dir/package) verify_signature(staging_dir/package) stop_running_instances() extract_to(staging_dir/extracted) atomic_swap(current_install_dir, staging_dir/extracted) start_instances() if failure: rollback_to(previous_install_dir) notify_user("Update failed; rolled back") If you want, I can convert this into a formatted report or generate the survey and test-case files for immediate use.
temp_path = config_path + ".tmp" write_json(temp_path, config_object) fsync(temp_path) rename(temp_path, config_path) # atomic on most OSes Appendix B — Updater staging flow (pseudocode) spectragryph crack upd better