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feat(filebox): Phase 108 FileBox write/write_all implementation
Implement write functionality for FileBox following Phase 108 specification,
completing the read/write pipeline via Ring0.FsApi.
## Implementation Summary
### Task 2: FsApi / Ring0FsFileIo write implementation
- Added write() method to FileIo trait
- Implemented write() in Ring0FsFileIo (truncate mode via Ring0.FsApi.write_all)
- Updated FileCaps to { read: true, write: true } for standard profile
- Added write() stub to CoreRoFileIo (returns Unsupported)
### Task 3: FileBox write/write_all implementation
- Updated FileBox.write_all() to delegate to provider.write()
- Updated FileBox.write() to convert content to text and call provider.write()
- UTF-8 conversion via String::from_utf8_lossy (text-oriented design)
- Returns "OK" on success, "Error: ..." on failure
### Task 4: Test coverage
- Round-trip test (write → read): ✅ PASS
- Truncate mode verification: ✅ PASS
- Write without open error: ✅ PASS
- Read-only provider rejection: ✅ PASS
- Auto-registration test updated: ✅ PASS
### Task 5: Documentation updates
- phase107_fsapi_fileio_bridge.md: Added Phase 108 section
- core_boxes_design.md: Updated Ring0.FsApi relationship section
- CURRENT_TASK.md: Added Phase 108 completion entry
## Design Decisions (from phase108_filebox_write_semantics.md)
- **Write mode**: truncate (overwrite existing file each time)
- **Text-oriented**: UTF-8 conversion via from_utf8_lossy
- **Append mode**: Planned for Phase 109+
- **Error handling**: FileError::Io for failures, Fail-Fast on caps.write=false
## Test Results
```
cargo test --release --lib filebox
test result: ok. 5 passed; 0 failed; 1 ignored
```
All FileBox tests pass, including Phase 107 compatibility tests.
## Pipeline Complete
```
FileBox.write(content)
↓
FileBox.write_all(buf)
↓
provider.write(text) ← Ring0FsFileIo implementation
↓
Ring0.FsApi.write_all()
↓
std::fs::write()
```
## Next Steps (Backlog)
- Phase 109: minimal/no-fs profile
- Phase 110: FileHandleBox (multiple files simultaneously)
- Phase 111: append mode implementation
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-03 18:40:33 +09:00 |
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