Feature/191 implement gphoto2 as camera source

[saeugetier]

Implemented #191: GPhoto camera source

[saeugetier]

Review summary (based on the PR metadata)

• PR: Feature/191 implement gphoto2 as camera source
• Author/branch: saeugetier:feature/191-implement-gphoto2-as-camera-source
• Files changed: 14, Commits: 18
• Net additions: +889 / -147
• PR body: "Implemented Implement GPhoto2 as camera source #191: GPhoto camera source"
• Mergeable: true (mergeable_state = unstable)
• Status: open

High-level feedback and checklist to verify before merging

1. Functionality & scope

   • Confirm the new camera source actually captures images reliably from supported cameras (both single-shot and streamed modes if relevant).
   • Verify behavior when no camera is attached or when multiple cameras are attached.

2. Build / runtime dependencies

   • Ensure gphoto2 (or whatever CLI/library is required) is documented as an optional dependency.
   • If the code calls an external binary, confirm it handles missing binary gracefully: clear error message and fallback behavior.
   • Update packaging (requirements, Dockerfile, CI images) so CI and deployment environments have the required binary/libraries.

3. Configuration and UX

   • Provide configuration options for selecting camera, device path, capture format, timeouts, retries.
   • Validate configuration values and provide sensible defaults.
   • Update README or docs with usage, examples and troubleshooting notes.

4. Robustness, error handling and cleanup

   • Ensure subprocesses or library sessions are cleaned up on errors or shutdown (no orphaned processes).
   • Add timeouts to external calls and retry/backoff where appropriate.
   • Log errors with enough context (camera id, command, exit code, stdout/stderr snippets) but avoid leaking large binary blobs.

5. Tests

   • Add unit tests for any new logic (parsing, configuration, conversions).
   • Add integration tests or mocked tests for camera interaction (mock the gphoto2 binary or camera API) so CI can validate behavior without hardware.
   • If integration tests require hardware, document how to run them locally.

6. Cross-platform / CI

   • If gphoto2 is Linux/macOS-only, document platform limitations and guard code accordingly.
   • Add CI steps or build matrix updates if anything in CI needs the binary or extra setup. If hardware is required, mark such tests as optional.

7. Security and permissions

   • Confirm no privileged operations are required at runtime (or document them).
   • If temporary files are used, ensure secure temp directories and correct file permissions.

8. API / Interface & backwards compatibility

   • If you changed public APIs or configuration schemas, document the change and provide migration guidance.
   • If this implements a new camera Source interface, ensure it fits the existing architecture and error semantics.

9. Performance and resource usage

   • Check for memory leaks or high CPU usage when streaming or repeatedly capturing.
   • Make sure image conversions are done efficiently and large images are not kept in memory longer than necessary.

10. Code quality & maintainability

• Confirm coding style/linting passes (go fmt / black / eslint etc, depending on language).
• Keep changes modular and add comments where the logic is non-obvious.
• Reduce duplication with existing camera-source implementations if any.

Suggested concrete PR comments you can add now

• "Please add documentation in README/config for installing/using gphoto2 and any platform constraints."
• "Add unit tests that mock the external camera binary/API to ensure CI coverage without hardware."
• "Handle the case when the gphoto2 binary is not installed: provide a clear error and exit code or fallback to alternate source."
• "Ensure subprocess calls have timeouts and proper cleanup on shutdown to avoid orphaned processes."
• "Please add an example configuration (in config.sample or docs) showing how to select the camera and configure capture options."

Questions for you (so I can give a more specific, line-by-line review)

• Do you want a high-level review (as above) or a detailed, file-by-file code review with inline comments?
• If you want a detailed review, grant me access to the diff/files (or paste the main changed files), and tell me which files to prioritize (e.g., camera source implementation, config, tests, CI).
• Are there specific concerns you already have (stability, performance, CI failures) I should focus on?

If you want, I can proceed with a targeted line-by-line review — tell me which files or which areas to inspect first.