NX2navi/tools/make_appimage.py

"""Build NX2navi-Linux-<version>-x86_64.AppImage: the Linux build kit as one file, which builds Ocarina of Time on the
player's PC from their own dump with tools/make_game.py, as NX2navi-Setup.exe does on Windows.

    python3 tools/make_appimage.py --python <standalone CPython 3.14> --appimagetool <appimagetool> [--out dist]

The AppImage holds no game files: the kit's tools/, recomp/, runtime/ and docs, the shader translator built by
tools/build_xlate.py (bin/nx2navi_xlate), the pinned Vulkan Memory Allocator header, and a relocatable CPython 3.14
(python-build-standalone, as `uv python install 3.14` puts in ~/.local/share/uv/python) with numpy, lz4, zstandard and
fonttools. zbic, the GPL package that unpacks the game's program files, is not bundled: the AppImage installs it with
pip into ~/.local/share/nx2navi/pydeps the first time it runs, as the Windows launcher downloads it.

The compiler and the libraries come from the system (README-BuildKit.md, "Linux"): the AppImage checks for clang,
clang++, lld and the headers before it starts, and names the packages for Arch, Fedora and Debian/Ubuntu.
"""
import argparse
import os
import shutil
import stat
import subprocess
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parent.parent
KIT_DIRS = ('recomp', 'runtime')
KIT_FILES = ('VERSION', 'LICENSE', 'LICENSE-ADDITIONS', 'THIRD_PARTY_NOTICES.md', 'nx2navi.ini.example')
TOOLS_SKIP = ('vendor', 'xlate', '__pycache__')   # the translator ships built (bin/); its sources stay out
PACKAGES = ('numpy==2.5.4', 'lz4==4.4.5', 'zstandard==0.25.0', 'fonttools==4.68.0')

APPRUN = r'''#!/bin/bash
# NX2navi build kit for Linux: builds Ocarina of Time (Switch 2, game 1.1.1) from the player's own dump.
HERE="$(dirname "$(readlink -f "$0")")"
PY="$HERE/usr/python/bin/python3"
KIT="$HERE/usr/kit"
DATA="${XDG_DATA_HOME:-$HOME/.local/share}/nx2navi"
PYDEPS="$DATA/pydeps"
unset PYTHONPATH PYTHONHOME

usage() {
    cat <<EOF
NX2navi $(cat "$KIT/VERSION") - build Ocarina of Time (Switch 2, game 1.1.1) natively for Linux from your own dump.

  $(basename "${APPIMAGE:-$0}") <your game.nup> [game folder]       build (default folder: ~/Games/Ocarina)
  $(basename "${APPIMAGE:-$0}") --check <your game.nup>             only check the dump's version
  $(basename "${APPIMAGE:-$0}") --make-game <make_game.py options>  run tools/make_game.py directly

The game folder then holds 'ocarina' and 'play.sh', which starts it. Nothing of the game is in this file:
everything the build writes comes from your dump, so keep it to yourself.
EOF
}

case "$1" in ""|-h|--help) usage; exit 0 ;; esac

missing=()
for tool in clang clang++ ld.lld; do command -v "$tool" >/dev/null || missing+=("$tool"); done
for h in SDL3/SDL.h vulkan/vulkan.h opus/opus.h vpx/vpx_decoder.h dav1d/dav1d.h zstd.h; do
    [ -e "/usr/include/$h" ] || [ -e "/usr/local/include/$h" ] || missing+=("$h")
done
if [ ${#missing[@]} -gt 0 ]; then
    cat >&2 <<EOF
Missing: ${missing[*]}
Install the compiler and libraries, then run this again:
  Arch, CachyOS, Manjaro, SteamOS (developer mode):
    sudo pacman -S --needed clang lld sdl3 opus libvpx dav1d zstd vulkan-headers vulkan-icd-loader
  Fedora:
    sudo dnf install clang lld SDL3-devel opus-devel libvpx-devel libdav1d-devel libzstd-devel \\
        vulkan-headers vulkan-loader-devel libstdc++-static libatomic
  Debian, Ubuntu:
    sudo apt install clang lld libsdl3-dev libopus-dev libvpx-dev libdav1d-dev libzstd-dev libvulkan-dev
EOF
    exit 1
fi

if ! PYTHONPATH="$PYDEPS" "$PY" -c 'import zbic' 2>/dev/null; then
    echo "Installing zbic (GPL-2.0, unpacks the game's program files) into $PYDEPS ..."
    "$PY" -m pip install --quiet --disable-pip-version-check --target "$PYDEPS" zbic || {
        echo "error: pip could not install zbic (it needs the internet once)" >&2; exit 1; }
fi

# One compile per 4 GB of RAM at most: with 16 GB, one per thread beside the RomFS image fills memory and swap.
mem_gb=$(awk '/MemTotal/ {print int($2 / 1048576)}' /proc/meminfo)
jobs=$(( mem_gb / 4 )); [ "$jobs" -lt 2 ] && jobs=2; [ "$jobs" -gt "$(nproc)" ] && jobs=$(nproc)

run_make_game() {
    "$PY" -I -c 'import sys; sys.path[:0] = [sys.argv[1], sys.argv[2] + "/tools"]; s = sys.argv[2] + "/tools/make_game.py"; sys.argv = [s] + sys.argv[3:]; import runpy; runpy.run_path(s, run_name="__main__")' \
        "$PYDEPS" "$KIT" "$@"
}

case "$1" in
    --make-game) shift; run_make_game "$@"; exit $? ;;
    --check) run_make_game --nup "$2" --check; exit $? ;;
esac

NUP="$1"
OUT="${2:-$HOME/Games/Ocarina}"
[ -f "$NUP" ] || { echo "error: $NUP is not a file" >&2; usage; exit 1; }
echo "Building into $OUT with $jobs compiles at a time (${mem_gb} GB of RAM); this takes 10 to 25 minutes."
run_make_game --nup "$NUP" --out "$OUT" --jobs "$jobs" || exit $?

# play.sh: the environment the game wants on this machine, then the game
{
    echo '#!/bin/bash'
    echo 'cd "$(dirname "$(readlink -f "$0")")"'
    if [ -e /proc/driver/nvidia/version ]; then
        echo '# NVIDIA: the default shadow storage leaves the 3D world black (issue #72)'
        echo 'export NX2NAVI_SHADOW="${NX2NAVI_SHADOW:-0}"'
    fi
    echo 'exec ./ocarina "$@"'
} > "$OUT/play.sh"
chmod +x "$OUT/play.sh"
echo
echo "Done. Start the game with: $OUT/play.sh"
'''

DESKTOP = '''[Desktop Entry]
Type=Application
Name=NX2navi
Comment=Build Ocarina of Time natively for Linux from your own dump
Exec=AppRun
Icon=nx2navi
Terminal=true
Categories=Game;
'''


def copy_tree(src, dst, skip=()):
    shutil.copytree(src, dst, ignore=lambda d, names: [n for n in names if n in skip or n == '__pycache__'])


def main():
    ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])
    ap.add_argument('--python', type=Path, required=True,
                    help='a relocatable CPython 3.14 folder (python-build-standalone, ~/.local/share/uv/python/cpython-3.14*)')
    ap.add_argument('--appimagetool', type=Path, required=True, help='appimagetool-x86_64.AppImage')
    ap.add_argument('--out', type=Path, default=ROOT / 'dist', help='where the AppImage goes (default dist/)')
    a = ap.parse_args()

    version = (ROOT / 'VERSION').read_text(encoding='utf-8').strip()
    xlate = ROOT / 'build' / 'xlate'
    for need in (xlate / 'nx2navi_xlate', xlate / 'nx2navi_xlate.id', ROOT / 'toolchain' / 'vma' / 'vk_mem_alloc.h',
                 a.python / 'bin' / 'python3'):
        if not need.exists():
            sys.exit(f'{need} is missing (tools/build_xlate.py builds the translator; tools/build_game.py fetches VMA)')

    app = ROOT / 'build' / 'appimage' / 'NX2navi.AppDir'
    shutil.rmtree(app, ignore_errors=True)
    kit = app / 'usr' / 'kit'
    kit.mkdir(parents=True)
    sys.path.insert(0, str(ROOT / 'tools'))
    import build_shaders
    build_shaders.build(ROOT / 'runtime')   # the image carries the runtime's shaders compiled (runtime/*_spv.h)
    for d in KIT_DIRS:
        copy_tree(ROOT / d, kit / d)
    copy_tree(ROOT / 'tools', kit / 'tools', TOOLS_SKIP)
    for f in KIT_FILES:
        shutil.copy2(ROOT / f, kit / f)
    (kit / 'docs').mkdir()
    shutil.copy2(ROOT / 'docs' / 'README-BuildKit.md', kit / 'docs' / 'README-BuildKit.md')
    (kit / 'bin').mkdir()
    for f in ('nx2navi_xlate', 'nx2navi_xlate.id'):
        shutil.copy2(xlate / f, kit / 'bin' / f)
    (kit / 'toolchain' / 'vma').mkdir(parents=True)
    shutil.copy2(ROOT / 'toolchain' / 'vma' / 'vk_mem_alloc.h', kit / 'toolchain' / 'vma' / 'vk_mem_alloc.h')

    py = app / 'usr' / 'python'
    shutil.copytree(a.python, py, symlinks=True)
    for marker in py.glob('lib/python3*/EXTERNALLY-MANAGED'):   # uv marks its Pythons; this copy is the AppImage's own
        marker.unlink()
    subprocess.run([py / 'bin' / 'python3', '-m', 'pip', 'install', '--quiet', '--disable-pip-version-check',
                    '--no-warn-script-location', *PACKAGES], check=True)
    for cache in py.rglob('__pycache__'):
        shutil.rmtree(cache, ignore_errors=True)

    (app / 'AppRun').write_text(APPRUN, encoding='utf-8')
    (app / 'AppRun').chmod(0o755)
    (app / 'nx2navi.desktop').write_text(DESKTOP, encoding='utf-8')
    from PIL import Image   # the window icon of runtime/nx2navi.ico, as PNG
    with Image.open(ROOT / 'runtime' / 'nx2navi.ico') as ico:
        ico.size = max(ico.ico.sizes())
        ico.convert('RGBA').save(app / 'nx2navi.png')

    a.out.mkdir(parents=True, exist_ok=True)
    target = a.out / f'NX2navi-Linux-{version}-x86_64.AppImage'
    env = dict(os.environ, ARCH='x86_64')
    subprocess.run([a.appimagetool, '--no-appstream', app, target], check=True, env=env)
    target.chmod(target.stat().st_mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
    print(f'{target} ({target.stat().st_size / 1e6:.0f} MB)')


if __name__ == '__main__':
    main()