ample/AmpleLinux/Agent.md

Agent Task Audit Log - Ample Linux Port

📅 Session: 2026-06-05 (Session 6)

🎯 Objective: PowerBook Compatibility Fallback & Downloader Parity

Addressed upstream MAME 0.288 C++ late-binding bug causing crashes on EASC audio chip Macs, and aligned the fallback interface with AmpleWin.

✅ Key Achievements:

1. Simplified Fallback Redirection:
   • Aligned the crash warning interface with AmpleWin for affected PowerBooks (macpb160 etc.).
   • Added a "Download Fallback (v0.287)" button that redirects users to the official MAME SDL Supported Platforms Wiki to download older MAME releases for their specific Linux distribution.
   • Maintains seamless redirection to mame_0287 or mame-vgm if already configured in the local directory.
2. ROM Manager Priority Update:
   • Reordered ROM download servers to prioritize mdk.cab, solving missing ROM zip structure bugs (such as dragon32) when running on modern MAME 0.288+.
3. Downloader Optimization:
   • Added mirror.ghproxy.com proxy support to VGM Mod mirrors for accelerated downloads on Linux systems.

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📅 Session: 2026-05-19 (Session 5)

🎯 Objective: Complete Slot Configuration Persistence (MAME Command Line)

Synchronized command line argument logic with AmpleWin to ensure "None" slots are explicitly disabled in MAME.

✅ Key Achievements:

1. Command-Line Slot Persistence:
   • Modified build_args in mame_launcher.py to allow empty string values (e.g. option is not None instead of if option:).
   • This ensures that -[slot_name] "" is explicitly passed on the command line, preventing MAME from falling back to its internal defaults.
2. Cross-Platform Parity: Ensured consistent behavior with Windows and Web ports.

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📅 Session: 2026-05-11 (Session 4)

🎯 Objective: Slot Configuration Consistency Fix

Synchronized slot initialization logic with AmpleWin to fix "None" persistence issue.

✅ Key Achievements:

1. "None-Aware" Slot Initialization:
   • Applied the slot_name not in self.current_slots fix to main.py.
2. Cross-Platform Consistency: Ensured Linux port shares the improved slot behavior.

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📅 Session: 2026-03-02 (Session 3)

🎯 Objective: Upstream Version Tracking & Documentation Maintenance

Focused on updating the Linux port documentation to track MAME 0.286 and simplifying maintainability.

✅ Key Achievements:

1. Documentation Refactoring:
   • Renamed version-specific screenshot files (e.g. screenshot-v0.28x.png to screenshot.png).
   • Updated README.md and README_tw.md to use generic "latest version" terminology to prevent the need for manual text updates upon future Ample/MAME releases.

🚀 Current Project Status

The Linux Port documentation is updated for MAME 0.286 and future-proofed against minor version increments.

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📅 Session: 2026-02-17 (Session 2)

🎯 Objective: Real-World Testing & Deployment Fix

Deployed the Linux Port to an actual Linux machine for testing. Identified and fixed a critical dependency installation issue.

✅ Key Achievements:

1. Launcher Script Fix (AmpleLinux.sh):

   • Bug: Original script used pip3 / pip commands directly, which don't exist on many modern Linux distros (Debian 12+, Ubuntu 23+, Fedora 38+ enforce PEP 668).
   • Fix v1: Changed to python3 -m pip (the universally reliable pip invocation).
   • Fix v2: Added automatic --break-system-packages fallback for PEP 668-compliant systems.
   • Error Messages: Added distro-specific guidance (apt/dnf/pacman) and venv instructions in error output.

2. Git Workflow:

   • Created linux branch from master.
   • Pushed to origin/linux for cross-machine testing.

🔍 Testing Observations (Real Linux Machine):

• pip3 command was not in PATH → first fallback triggered.
• python3 -m pip also failed (PEP 668 system Python restriction) → second fallback triggered with --break-system-packages.
• Conclusion: Many modern Linux distros require either system packages (sudo apt install python3-pyside6 python3-requests) or a venv approach. The launcher script now documents both paths clearly.

⚠️ Known Issue - Pending Resolution:

• Systems without any pip module need manual package installation first. The script provides clear guidance but cannot auto-resolve this without sudo.
• Recommended solutions (in priority order):
  1. System packages: sudo apt install python3-pyside6 python3-requests
  2. Install pip: sudo apt install python3-pip, then re-run script
  3. Use venv: python3 -m venv venv && source venv/bin/activate && pip install -r requirements.txt && python3 main.py

🚀 Current Project Status

Codebase is ported and pushed to linux branch. Launcher script has been hardened for modern Linux distros. Awaiting successful end-to-end test with dependencies installed.

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📅 Session: 2026-02-16 (Session 1)

🎯 Objective: Linux Port Creation

Ported AmpleWin (Windows) to Linux, following the original author's suggestion (ksherlock/ample#45) that Linux support would be easy to add.

✅ Key Achievements:

1. Codebase Porting (from AmpleWin):

   • Zero-Modification Files: data_manager.py, rom_manager.py, mame_launcher.py, requirements.txt — copied directly, no changes needed.
   • Simplified mame_downloader.py: Removed MameDownloadWorker entirely (Linux users install MAME via their package manager). Kept VgmModDownloadWorker with Linux adaptations (7z via PATH, no .exe suffix, helpful p7zip install instructions).
   • main.py (~20 changes): Comprehensive platform adaptation:
     • Replaced winreg theme detection with gsettings (GNOME 42+ color-scheme) and KDE (kdeglobals) dark mode detection.
     • Replaced all os.startfile() calls with xdg-open via a helper function _xdg_open().
     • Removed all .exe suffixes from MAME binary references (mame.exe → mame, mame-vgm.exe → mame-vgm).
     • Enhanced check_for_mame() to search system paths (/usr/bin/mame, /usr/games/mame, /usr/local/bin/mame) and use which mame.
     • Replaced Download MAME button with package manager guidance text.
     • Updated shlex.split() from posix=False (Windows) to posix=True (Linux).
     • Updated file browser filter from *.exe to All Files (*).
     • Changed window title and help URL.

2. Launcher Script:

   • Created AmpleLinux.sh as equivalent of AmpleWin.bat.
   • Includes Python 3 detection, pip dependency installation, and helpful error messages with distro-specific commands.

3. Documentation:

   • Created dual-language READMEs (README.md English, README_tw.md Traditional Chinese).
   • Includes installation guide for all major distros (Ubuntu, Fedora, Arch, Flatpak).
   • Troubleshooting section for PySide6, MAME detection, and theme issues.

🔍 Design Decisions:

1. Separate Directory (not shared codebase): Chose to create AmpleLinux/ as a separate directory rather than refactoring AmpleWin/ into a shared codebase. This maintains the project convention where each platform gets its own additive subdirectory, minimizing risk to the stable Windows port.

2. No MAME Auto-Download: Following the original author's guidance ("let the user download it themselves"), Linux users install MAME via their system package manager. This is the Linux cultural norm and avoids complex binary distribution issues.

3. GNOME + KDE Theme Detection: Implemented multi-strategy dark mode detection covering GNOME 42+ color-scheme, older GNOME gtk-theme, and KDE kdeglobals, with Qt palette as ultimate fallback.

🚀 Current Project Status

The Linux Port is functionally complete. All Windows-specific code has been adapted, and the application should work on major Linux distributions with GNOME or KDE desktops.

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Handover Notes for Future Agents

1. Platform Differences from AmpleWin

• No winreg: Theme detection uses gsettings and KDE config file parsing.
• No os.startfile(): Uses xdg-open via the _xdg_open() helper function.
• No .exe suffixes: All binary references use bare names (mame, mame-vgm).
• No MAME auto-download: Users install via package manager. Settings dialog shows guidance.
• shlex.split(posix=True): Linux uses POSIX-mode shell parsing (no special Windows path handling).
• MAME detection: Checks PATH via which, plus standard Linux paths (/usr/bin, /usr/games, /usr/local/bin).

2. Deployment (CRITICAL)

• PEP 668 Era: Modern Linux distros (Debian 12+, Ubuntu 23.04+, Fedora 38+) block global pip installs. The launcher script handles this with --break-system-packages fallback.
• Recommended Install Methods (in priority order):
  1. System packages: sudo apt install python3-pyside6 python3-requests mame
  2. venv: python3 -m venv venv && source venv/bin/activate && pip install -r requirements.txt
  3. pip with override: python3 -m pip install -r requirements.txt --break-system-packages
• Never use pip3 or pip directly in scripts — always use python3 -m pip for reliability.

3. Known Mantras (inherited from AmpleWin)

• Visual Parity is King: Every margin, font size, and color was cross-referenced with macOS.
• Authorship: This Linux Port is based on the AmpleWin collaboration between anomixer and Antigravity.

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📅 Session: 2026-02-17 (Session 2)

🎯 Objective: First-Run Experience, Build System & Polish

✅ Key Changes:

1. Launcher Architecture (AmpleLinux.sh):

   • Refactored to venv: Switched from system-level apt dependencies to a strictly isolated python3 -m venv approach.
   • Automated Setup: Script now auto-creates .venv, installs python3-venv (if missing), and pip installs requirements.txt.
   • Distro Agnostic: Only depends on python3-full and libxcb-cursor* (apt) for the base interpreter; all libraries (PySide6) are pulled via pip.
   • ALSA Fix: Added auto-detection of /proc/asound and usermod -a -G audio fix for permission issues.

2. User Experience Enhancements (main.py):

   • Ubuntu Snap Integration: If MAME is missing on Ubuntu, offers sudo snap install mame with a non-blocking QProgressDialog.
   • Configuration Fix: ensure_mame_ini now runs mame -cc inside AmpleLinux/mame to keep config portable.
   • Path Precision: update_command_line now resolves absolute paths for -inipath and -rompath (e.g., /home/user/...).
   • BGFX Cleanup: Removed Windows-only Direct3D options.
   • UI Polish: "Generate VGM" now shows a "Feature not implemented" popup.

3. Build System (New):

   • make_icon.py: Created Linux-specific icon generator (produces standard PNG sizes: 16x16 to 512x512).
   • build_elf.sh: Created PyInstaller build script that uses a temporary venv to bypass PEP 668 restrictions and produce a standalone ELF binary in dist/.

🔍 Technical Decisions:

• PySide6 via pip: Moved away from python3-pyside2 (apt) because the codebase is written for PySide6. Using venv + pip ensures version consistency and avoids the "externally-managed-environment" error on modern distros.
• MAME Snap: For Ubuntu users, Snap is the most reliable way to get a recent MAME version without PPA complexity.