# Embedded Resources in Knoe Installer

## Overview

The Knoe Installer package includes several embedded resources that must be accessible both when running from source and when packaged as a standalone binary.

## Embedded Resources

### 1. Images (img/)
- **knoeIcon.png** (1.5 MB) - Application icon
- **knoeLogo.png** (2.2 MB) - Main logo
- **knoeLogoSepia.png** (2.7 MB) - Sepia background for GUI
- **knoeLogoBlueprint.png** (3.1 MB) - Blueprint variant
- **knoeIconblueprint.png** (1.6 MB) - Blueprint icon variant

### 2. Binary Executables
- **scan/network-agent** (6.8 MB) - Network scanner
  - Universal binary (x86_64 + arm64)
  - Used by network scan screen
  - Detects Kerberos, Active Directory, etc.

### 3. Application Bundles
- **knoe-app/dist/Knoe Tools.app** (~12 MB) - Pre-built Knoe Tools
  - Complete macOS .app bundle
  - Used by installer creation screen
  - Can be copied to DMG or USB installer

## How Embedding Works

### Resource Path Resolution

All resources use the `get_resource_path()` helper function:

```python
def get_resource_path(relative_path):
    """Get absolute path to resource, works for dev and for PyInstaller."""
    try:
        # PyInstaller creates a temp folder and stores path in _MEIPASS
        base_path = Path(sys._MEIPASS)
    except AttributeError:
        # Running from source
        base_path = PROJECT_ROOT
    return base_path / relative_path
```

### Usage Examples

**Image Loading:**
```python
bg_path = get_resource_path('img/knoeLogoSepia.png')
if bg_path.exists():
    image = Image.open(str(bg_path))
```

**Binary Execution:**
```python
scan_binary = get_resource_path("scan/network-agent")
if scan_binary.exists():
    process = subprocess.Popen([str(scan_binary)], ...)
```

**App Bundle Access:**
```python
app_src = get_resource_path('knoe-app/dist/Knoe Tools.app')
if app_src.exists():
    # Copy to destination
    shutil.copytree(app_src, dest)
```

## PyInstaller Configuration

### Spec File (scripts/generate_spec.py)

**Data Files:**
```python
datas = [
    ('installer', 'installer'),
    ('conf', 'conf'),
    ('etc', 'etc'),
    ('img', 'img'),
    ('docs', 'docs'),
    ('knoe-app/dist/Knoe Tools.app', 'knoe-app/dist/Knoe Tools.app'),
]
```

**Binaries:**
```python
binaries = [
    ('scan/network-agent', 'scan'),
]
```

The `binaries` list ensures executable permissions are preserved.

## File Sizes

Total embedded resources: ~30-35 MB

Breakdown:
- Images: ~11 MB
- network-agent: 6.8 MB
- Knoe Tools.app: ~12 MB
- Other resources: ~5-10 MB

Final installer bundle: ~50-100 MB (includes Python runtime)

## Usage in Installer

### Network Scan Screen

The network scan screen uses `network-agent` to detect services:

```python
scan_binary = get_resource_path("scan/network-agent")
process = subprocess.Popen([str(scan_binary)],
                         stdout=subprocess.PIPE,
                         stderr=subprocess.STDOUT,
                         text=True)
```

Output is captured in real-time and displayed in the scan results text widget.

### Installer Creation Screen

The installer creation screen copies Knoe Tools.app to DMG:

```python
app_src = get_resource_path('knoe-app/dist/Knoe Tools.app')
if app_src.exists():
    shutil.copytree(app_src, staging / 'Knoe Tools.app')
```

## Testing

### Verify Resources from Source

```bash
python3 test_embedded_resources.sh
```

This tests:
- ✓ All image files exist
- ✓ network-agent binary exists and is executable
- ✓ Knoe Tools.app bundle exists
- ✓ Spec file includes all resources
- ✓ Resource sizes

### Verify Resources in Built Package

After building:

```bash
# Check extracted resources
./dist/knoe-installer --help

# In another terminal, while installer is running:
ls -la /tmp/_MEI*/scan/
ls -la /tmp/_MEI*/img/
ls -la "/tmp/_MEI*/knoe-app/dist/Knoe Tools.app"
```

## Troubleshooting

### Binary Not Found Error

**Error:** `Scan binary not found at /var/folders/.../scan/network-agent`

**Cause:** Binary not included in package or path not using `get_resource_path()`

**Solution:**
1. Verify spec includes binary: `grep network-agent installer.spec`
2. Check code uses `get_resource_path()`: `grep "get_resource_path.*network-agent" install.py`
3. Rebuild: `make clean && make package`

### Binary Not Executable

**Error:** `Permission denied` when running network-agent

**Cause:** Binary permissions not preserved in package

**Solution:**
Ensure binary is in `binaries` list (not `datas`) in spec file:
```python
binaries = [
    ('scan/network-agent', 'scan'),  # Correct - preserves +x
]
# NOT in datas:
# datas = [('scan/network-agent', 'scan')]  # Wrong - loses +x
```

### App Bundle Not Found

**Error:** `Knoe Tools.app not found`

**Cause:** App not built before packaging installer

**Solution:**
1. Build Knoe Tools.app first (in knoe-app directory)
2. Verify it exists: `ls "knoe-app/dist/Knoe Tools.app"`
3. Then build installer: `make package`

### Large Bundle Size

**Cause:** Including large binary files significantly increases bundle size

**Optimization Options:**
1. **Compress app bundle:**
   ```bash
   cd knoe-app/dist
   zip -r "Knoe Tools.zip" "Knoe Tools.app"
   # Include zip instead of .app
   ```

2. **Download on demand:**
   Instead of embedding, download from server when needed

3. **Exclude debug symbols:**
   Strip binaries before packaging:
   ```bash
   strip scan/network-agent
   ```

## Build Process

When running `make package`:

1. **Icon conversion:** PNG → ICNS
2. **Spec generation:** Creates installer.spec with all resources
3. **PyInstaller:**
   - Analyzes install.py
   - Collects dependencies
   - Copies data files (preserves directory structure)
   - Copies binaries (preserves execute permissions)
   - Creates single-file executable
4. **Bundle creation:** Packages into .app with icon

### Resource Extraction at Runtime

When the packaged installer runs:

1. PyInstaller extracts resources to `/tmp/_MEI<random>/`
2. Sets `sys._MEIPASS` to extraction directory
3. `get_resource_path()` uses `_MEIPASS` to find resources
4. Resources deleted automatically when installer exits

## Security Considerations

### Code Signing

Embedded binaries should be code signed:

```bash
codesign --force --sign "Developer ID Application: Your Name" scan/network-agent
```

Then build the installer - the signed binary will be included.

### Verification

Users can verify embedded binaries:

```bash
# Check signature of network-agent after extraction
codesign --verify --verbose /tmp/_MEI*/scan/network-agent

# Check installer bundle signature
codesign --verify --verbose "dist/Knoe Installer.app"
```

## Future Enhancements

### Lazy Loading

For large resources, consider lazy loading:

```python
def get_knoe_tools_app():
    """Download or extract Knoe Tools.app only when needed."""
    app_path = get_resource_path('knoe-app/dist/Knoe Tools.app')
    if not app_path.exists():
        # Download from server
        download_knoe_tools(app_path)
    return app_path
```

### Compression

Compress large resources:

```python
# In spec file
datas = [
    ('knoe-app/dist/Knoe Tools.zip', 'knoe-app/dist'),  # Compressed
]

# In code
def extract_knoe_tools():
    zip_path = get_resource_path('knoe-app/dist/Knoe Tools.zip')
    extract_dir = Path(tempfile.mkdtemp())
    shutil.unpack_archive(zip_path, extract_dir)
    return extract_dir / 'Knoe Tools.app'
```

## References

- [PyInstaller Data Files](https://pyinstaller.org/en/stable/spec-files.html#adding-data-files)
- [PyInstaller Binaries](https://pyinstaller.org/en/stable/spec-files.html#adding-binaries)
- [macOS App Bundle Structure](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html)