Module external_vcs_adapter 

External VCS adapter — SourceAdapter implementation over JSON-over-stdio.

Wraps an external VCS plugin process and implements the SourceAdapter trait by translating every method call into a single JSON-over-stdio request/response exchange.

Lifecycle

For each method call, ExternalVcsAdapter:

1. Spawns the plugin process (fresh per call — plugins are stateless).
2. Sends a VcsPluginRequest JSON line to the process’s stdin.
3. Reads the VcsPluginResponse JSON line from stdout.
4. Waits for the process to exit.
5. Returns the parsed result or a SubmitError on failure.

Handshake

The first call in ExternalVcsAdapter::new() performs a handshake to validate protocol compatibility. An incompatible protocol version causes construction to fail with SubmitError::ConfigError.

Structs

ExternalVcsAdapter

SourceAdapter that delegates all operations to an external plugin process.