mirror of
https://github.com/lucannez64/darling-lol.git
synced 2026-10-27 19:54:38 +00:00
86 lines
3.9 KiB
Python
Executable File
86 lines
3.9 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Run a command without the host file descriptors this launcher inherited (anything above stderr).
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With RCLOL_FILTER_HOST_ENV=1 it also drops host desktop-session variables first (see
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host_session_variable). RCLOL_KEEP_HOST_ENV lists names to keep anyway, separated by spaces or commas.
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"""
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import os
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import sys
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# Desktop-session, service-manager, terminal and packaging metadata that nothing in the guest reads.
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# Everything Darling and the host libraries it loads need is kept: DISPLAY, XAUTHORITY, XCURSOR_*,
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# XDG_RUNTIME_DIR, XDG_DATA_DIRS and the other XDG base directories (the Vulkan loader searches
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# them), DBUS_SESSION_BUS_ADDRESS, PULSE_*, PIPEWIRE_*, ALSA_*, DRI_PRIME, MESA_*, mesa_glthread,
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# __GL_*, __NV_*, __EGL_*, VK_*, LIBGL_*, LD_PRELOAD (gamemoderun) and LD_LIBRARY_PATH.
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SESSION_PREFIXES = (
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'XDG_SESSION_', 'XDG_SEAT', 'XDG_VTNR', 'XDG_CURRENT_DESKTOP', 'XDG_MENU_PREFIX',
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'GNOME_', 'KDE_', 'GDM', 'SSH_', 'SYSTEMD_', 'MEMORY_PRESSURE_', 'QT_', 'GTK_', 'GDK_',
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'GIO_', 'GSETTINGS_', 'GJS_', 'FLATPAK_', 'SNAP_', 'KONSOLE_', 'TERM_PROGRAM', 'BASH_FUNC_',
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# Host shell, prompt and developer-tool metadata. None of it exists on a Mac and
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# several entries name Linux paths, so the guest must not inherit them.
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'STARSHIP_', 'ILLOGICAL_IMPULSE_', 'INIR_', 'PNPM_', 'YARN_', 'npm_config_', 'PIP_',
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'CARGO_', 'GIT_', 'LESS_TERMCAP_', '_P9K_', 'VSSCRIPT_', 'ORCA_', 'CLAUDE', 'TF_',
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'CUDA_', 'COMPOSER_', 'DEBIAN_', 'FZF_', 'BAT_', 'MYSQL_', 'AWS_', 'LESS',
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'CLOUDSDK_', 'GH_', 'GLAB_', 'HOMEBREW_', 'ELECTRON_', 'DELTA_', 'HIST', 'GPG_',
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)
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SESSION_NAMES = {
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'WAYLAND_DISPLAY', 'DESKTOP_SESSION', 'DESKTOP_STARTUP_ID', 'SESSION_MANAGER',
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'INVOCATION_ID', 'JOURNAL_STREAM', 'MANAGERPID', 'MANAGERPIDFDID', 'NOTIFY_SOCKET',
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'LISTEN_FDS', 'LISTEN_PID', 'LISTEN_FDNAMES', 'COLORTERM', 'VTE_VERSION', 'WINDOWID',
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'WINDOWPATH', 'CHROME_DESKTOP', 'NO_AT_BRIDGE', 'MOTD_SHOWN', 'SNAP', 'APPIMAGE', 'APPDIR',
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'OWD', 'VIRTUAL_ENV', 'DEBUGINFOD_URLS', 'LS_COLORS', 'COLORFGBG', 'OLDPWD', 'SHLVL',
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'AGENT', 'NO_COLOR', 'TERM', 'VISUAL', 'PROMPT_COMMAND', 'HISTFILE', 'HISTSIZE',
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'SAVEHIST', 'HISTORY_IGNORE', 'PYTHONUNBUFFERED', 'LINES', 'COLUMNS', '_',
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'CI', 'EDITOR', 'PAGER', 'GIT_PAGER', 'SYSTEMD_PAGER', 'MANPAGER',
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}
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GUEST_SHELL = '/bin/zsh'
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def host_session_variable(name):
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return name in SESSION_NAMES or name.startswith(SESSION_PREFIXES)
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def filter_host_environment(environ):
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"""Return the names removed from environ (a mutable mapping), honoring RCLOL_KEEP_HOST_ENV."""
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keep = set(environ.get('RCLOL_KEEP_HOST_ENV', '').replace(',', ' ').split())
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removed = sorted(name for name in environ if host_session_variable(name) and name not in keep)
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for name in removed:
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del environ[name]
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# The host login shell (for example /bin/fish) does not exist in the guest.
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if 'SHELL' not in keep:
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environ['SHELL'] = GUEST_SHELL
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# A host PATH names Linux directories; the guest always has the Mac layout.
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if 'PATH' not in keep:
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environ['PATH'] = '/usr/bin:/bin:/usr/sbin:/sbin'
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environ.pop('RCLOL_KEEP_HOST_ENV', None)
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environ.pop('RCLOL_FILTER_HOST_ENV', None)
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return removed
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def close_inherited_fds():
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"""A terminal, IDE or service manager can leak descriptors; the guest must not inherit them."""
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try:
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names = os.listdir('/proc/self/fd')
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except OSError:
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os.closerange(3, 65536)
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return
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for name in names:
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if name.isdigit() and int(name) > 2:
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try:
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os.close(int(name))
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except OSError:
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pass # the descriptor listdir used is already closed
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def main(argv):
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if len(argv) < 2:
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sys.exit('usage: exec-guest.py COMMAND [ARGUMENT]...')
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if os.environ.get('RCLOL_FILTER_HOST_ENV') == '1':
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filter_host_environment(os.environ)
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close_inherited_fds()
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os.execvp(argv[1], argv[1:])
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if __name__ == '__main__':
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main(sys.argv)
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