Remove distinct in-memory config type

[Copilot]

StartupConfig was a near-identical copy of CCHostConfig that existed as a holdover from SGX/ringbuffer days. It added complexity by requiring conversion between types and duplicated field definitions. This consolidates them by making StartupConfig an alias for CCFConfig.

Changes

• Merged StartupConfig fields into CCFConfig: Runtime fields (startup_host_time, node_data, service_data, sealed_ledger_secret_location) and nested types (Start, Join, Recover) now live directly in CCFConfig
• Type alias for backward compatibility: using StartupConfig = CCFConfig;
• Updated all references: Enclave, node, and host code now use CCFConfig directly
• Removed redundant snapshot_tx_interval: Was duplicate of snapshots.tx_count

Before/After

// Before: Two separate types with conversion
ccf::StartupConfig startup_config(config);  // Sliced from CCHostConfig

// After: Single type, explicit base copy
ccf::CCFConfig startup_config = static_cast<const ccf::CCFConfig&>(config);

Files

• include/ccf/node/startup_config.h - Consolidated types
• src/common/configuration.h - Updated JSON serialization
• src/host/run.cpp - Updated function signatures
• src/enclave/*.{h,cpp}, src/node/*.h - Use CCFConfig

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Remove distinct in-memory config type</issue_title>
<issue_description>Another awkward hold-over from the SGX/ringbuffer days. We have a host::CCHostConfig type, that is directly JSON-serialisable - this is what the operators give us. We convert that to a near-identical-bar-some-naming-and-instantiation type called ccf::StartupConfig. One thing that used to do was strip out the host-only bits so the enclave didn't worry about them, but we want to push much of that reasoning into the "enclave" code. It also did some early validation/reification, but we think that can all be pushed to time-of-use, removing some TOCTOU concerns.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove distinct in-memory config type #7565

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.