English | Deutsch

dmgTweak

Modern DMG creation and conversion tool for macOS with advanced icon support.

Features

• DMG Creation: Create DMGs from folders or empty images
• DMG Conversion: Convert between read-only (UDZO) and read-write (UDRW) formats
• Icon Support: Automatically extract and apply app icons to DMGs
• Password Protection: Full encryption support for secure DMGs
• Modern UI: Native SwiftUI interface with dark mode support
• File System Options: Support for APFS and HFS+J formats

Requirements

• macOS 13.0 or later
• Swift 5.9 or later

Building

Using Swift Package Manager

# Build for debug
swift build

# Build for release
swift build -c release

Development Build (Recommended)

# Build with automatic .app timestamp update for development
./dev-build.sh

# Also works with swift build arguments
./dev-build.sh -c release

This updates dist/dmgTweak.app. The bundle timestamp is touched so you can see at a glance if it's the current build.

Using the Build Script

# Full build with linting and formatting
./build.sh

# Quick build without dependencies
./build.sh --no-deps --no-lint

The build script will:

1. Install/check dependencies (SwiftFormat, SwiftLint)
2. Format and lint the code
3. Compile with Swift Package Manager
4. Update the dist app bundle (binary name inside bundle: Contents/MacOS/dmgTweak)
5. Keep outputs only in dist/

Run locally:

open dist/dmgTweak.app

Architecture

The app is built with a clean, modular architecture:

• dmgTweakApp.swift - Main SwiftUI app and UI
• DMGOperations.swift - Core DMG creation and conversion
• DMGIconOperations.swift - Icon-specific operations
• IconHandler.swift - Icon extraction and application
• MountManager.swift - DMG mounting/unmounting
• UIComponents.swift - Reusable UI components
• FilePickerManager.swift - File selection utilities

Code Quality

• ✅ Modular architecture with 13 focused modules
• ✅ Swift Actors for safe concurrency
• ✅ Comprehensive error handling
• ✅ Memory management with automatic cleanup
• ✅ SwiftLint compliant (95%+ violations resolved)

License

Apache License 2.0. See LICENSE.

Changelog

v1.0.0

• Initial public release under Apache-2.0
• SavePanel: defaults to ~/Downloads, suggests current Volume name
• Create flow: shows SavePanel on click; replaces existing file after confirmation
• Resets: clears selected paths and resets Volume ("Image") after creation; clears inputs on mode switch
• Locale: Info.plist set to German (dialogs in Deutsch)
• Bundle: unified binary name Contents/MacOS/dmgTweak
• Tooling: SwiftLint/SwiftFormat configured; backup file excluded from lint

Build From Source (macOS)

1. Clone the repo: git clone https://github.com/henosch/dmgTweakApp.git && cd dmgTweakApp
2. Build: ./dev-build.sh (recommended) or swift build
3. Run: open dist/dmgTweak.app

Language

• UI follows system language (Deutsch/English).
• Override via Terminal:
  • English: defaults write de.free.dmgTweak AppleLanguages -array en
  • German: defaults write de.free.dmgTweak AppleLanguages -array de
  • Reset: defaults delete de.free.dmgTweak AppleLanguages

Screenshots

English UI

German UI