# FUSE POC Test Report

**Date**: 2026-05-17
**Environment**: M4 Mac mini, macOS 26.4.1
**Test Phase**: Phase 1 POC Verification

---

## Executive Summary

**Status**: ✅ All tests passed

**Key Findings**:
- Backend detection works correctly (macOS 26.4.1 → FSKit)
- CLI commands functional (fuse detect-backend, fuse poc)
- Rust compilation successful
- Placeholder FUSE implementation ready for full implementation

**Next Steps**: Install FUSE-T and implement real FUSE filesystem

---

## Test Results

### Test 1: Backend Detection

| Check | Expected | Actual | Pass/Fail |
|-------|----------|--------|-----------|
| macOS version detected | 26.4.1 | 26.4.1 | ✅ Pass |
| Recommended backend | FSKit | FSKit | ✅ Pass |
| Backend explanation | Provided | Provided | ✅ Pass |
| Available backends listed | nfs, fskit | nfs, fskit | ✅ Pass |

**Output**:
```
macOS version: 26.4.1
Recommended backend: fskit
Reason: macOS 26+ supports FSKit (native, fastest)
Performance: Direct userspace path, minimal overhead

Available backends:
  nfs  - NFSv4 backend (stable, all macOS versions)
  fskit - FSKit backend (macOS 26+, fastest)
```

### Test 2: Auto Backend Selection

| Check | Expected | Actual | Pass/Fail |
|-------|----------|--------|-----------|
| Backend auto-detected | FSKit | FSKit | ✅ Pass |
| Mount path displayed | /tmp/fuse_test_auto | /tmp/fuse_test_auto | ✅ Pass |
| macOS version shown | 26.4.1 | 26.4.1 | ✅ Pass |
| Placeholder executed | Success | Success | ✅ Pass |

### Test 3: Manual Backend Selection (FSKit)

| Check | Expected | Actual | Pass/Fail |
|-------|----------|--------|-----------|
| Backend specified | FSKit | FSKit | ✅ Pass |
| Mount path default | /tmp/fuse_test | /tmp/fuse_test | ✅ Pass |
| Placeholder executed | Success | Success | ✅ Pass |

### Test 4: Manual Backend Selection (NFSv4)

| Check | Expected | Actual | Pass/Fail |
|-------|----------|--------|-----------|
| Backend specified | NFSv4 | NFSv4 | ✅ Pass |
| Mount path default | /tmp/fuse_test | /tmp/fuse_test | ✅ Pass |
| Placeholder executed | Success | Success | ✅ Pass |

### Test 5: Invalid Backend Error Handling

| Check | Expected | Actual | Pass/Fail |
|-------|----------|--------|-----------|
| Error message shown | "Unknown backend" | "Unknown backend" | ✅ Pass |
| Exit status | Error | Error | ✅ Pass |

### Test 6: Compilation Check

| Check | Expected | Actual | Pass/Fail |
|-------|----------|--------|-----------|
| cargo check succeeds | Exit 0 | Exit 0 | ✅ Pass |
| No compilation errors | True | True | ✅ Pass |
| Warnings (acceptable) | Few warnings | 4 warnings | ✅ Pass |

### Test 7: Unit Tests

| Check | Expected | Actual | Pass/Fail |
|-------|----------|--------|-----------|
| cargo test fuse passes | 0 failed | 0 failed | ✅ Pass |
| Backend tests | Pass | Pass | ✅ Pass |

---

## Environment Verification

### Hardware

| Component | Specification | Status |
|-----------|--------------|--------|
| CPU | Apple M4 (10 cores) | ✅ Verified |
| RAM | 16 GB | ✅ Verified |
| Storage | KIOXIA NVMe 2TB (PCIe) | ✅ Verified |
| OS | macOS 26.4.1 | ✅ Verified |

### Software Dependencies

| Dependency | Version | Status |
|------------|---------|--------|
| Rust | Latest stable | ✅ Verified |
| time crate | 0.3 | ✅ Added |
| lru crate | 0.12 | ✅ Added |
| libc crate | 0.2 | ✅ Added |

### Downloaded Files

| File | Size | Status |
|------|------|--------|
| fuse-t-1.2.6.pkg | 23 MB | ✅ Downloaded |
| AJA_System_Test.dmg | 457 KB | ⚠️ Downloaded (may be HTML) |

---

## Module Structure

**Created Files**:
- `src/fuse/mod.rs` - FUSE module entry point
- `src/fuse/poc_hello.rs` - Placeholder FUSE implementation
- `src/fuse/backend.rs` - Backend selection logic
- `tests/fuse_poc_test.sh` - Automated test script

**Cargo.toml Updates**:
- Added dependencies: time, lru, libc
- Added fuse module to lib.rs

**CLI Commands Added**:
- `cargo run -- fuse detect-backend`
- `cargo run -- fuse poc --dir <path> --backend <auto|nfs|fskit>`

---

## Backend Selection Logic

### Implementation Details

```rust
pub fn select_backend() -> BackendType {
    let version = detect_macos_version();
    
    if version.starts_with("26") {
        BackendType::Fskit  // macOS 26+ supports FSKit
    } else {
        BackendType::Nfs4   // Older macOS uses NFSv4
    }
}
```

### Test Results

| macOS Version | Expected Backend | Actual Backend | Pass/Fail |
|---------------|-----------------|----------------|-----------|
| 26.4.1 | FSKit | FSKit | ✅ Pass |
| 25.0.0 (test) | NFSv4 | NFSv4 | ✅ Pass (unit test) |

---

## Known Limitations

1. **Placeholder Implementation**: Current FUSE mount is a placeholder, not a real filesystem
2. **AJA System Test**: Downloaded file may be HTML page, not actual DMG
3. **FUSE-T Installation**: Requires sudo password (cannot auto-install)
4. **Actual FUSE Library**: Not yet added to dependencies (requires fuse crate)

---

## Next Steps

### Phase 1 Completion (Requires Manual Steps)

1. **Install FUSE-T**:
   ```bash
   sudo installer -pkg ~/Downloads/fuse-t-1.2.6.pkg -target /
   ```
   
2. **Verify Installation**:
   ```bash
   ls -la /usr/local/bin/fuse-t
   fuse-t --version
   ```

3. **Download AJA System Test Properly**:
   - Visit: https://www.aja.com/en/products/aja-system-test
   - Download actual DMG file

### Phase 2: Real FUSE Implementation (Day 3-5)

1. Add fuse library dependency (fuse crate)
2. Implement real FUSE operations (getattr, read, write)
3. Integrate with SQLite backend
4. Test with warren user (12,659 nodes)

### Phase 3: Multi-user Concurrent Mount (Day 6-8)

1. Implement MountManager
2. Test 10 user parallel mount
3. AJA concurrent write test

### Phase 4: Performance Optimization (Day 9-12)

1. Write buffering (64KB chunks)
2. LRU caching
3. FSKit backend optimization
4. 600MB/s target validation

---

## Test Execution Time

| Test | Duration |
|------|----------|
| Test 1: Backend Detection | 0.3s |
| Test 2: Auto Backend | 0.3s |
| Test 3: Manual FSKit | 0.2s |
| Test 4: Manual NFSv4 | 0.3s |
| Test 5: Error Handling | 0.3s |
| Test 6: Compilation | 0.2s |
| Test 7: Unit Tests | 0.0s |
| **Total** | **1.6s** |

---

## Conclusion

**Phase 1 POC Status**: ✅ Successfully completed (placeholder level)

**Ready for Phase 2**: ✅ Yes, pending FUSE-T installation

**Critical Path**: Install FUSE-T → Add fuse crate → Implement real FUSE filesystem

---

**Generated**: 2026-05-17 10:15
**Test Suite Version**: 1.0
**Report Author**: MarkBase FUSE POC Team