mirror of
https://github.com/kuhyx/utils.git
synced 2026-11-12 12:31:00 +01:00
Krzysztof kuhy Rudnicki
5f7553de91
Extracted from wake_alarm, screen-locker, and diet_guard, which each independently implemented fullscreen-lock, input-grab, VT-disable, and HMAC-signed-state mechanics at different levels of maturity (the HMAC module was already a hand-copied duplicate between two of them). LockConfig exposes overrideredirect/grab/disable_vt as independent axes so one LockWindow can reproduce all three projects' exact prior behavior, plus screen-locker's confirmed upgrade to retry-forever grab.
38 lines
1.2 KiB
Python
38 lines
1.2 KiB
Python
"""VT-switch (Ctrl+Alt+Fn) disable/restore via setxkbmap.
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Disabling VT switching is what stops a locked window from being bypassed by
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dropping to a TTY. Best-effort: silently does nothing if setxkbmap isn't
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installed, matching the behavior of every implementation this was ported from.
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"""
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from __future__ import annotations
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import logging
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import shutil
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import subprocess
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_logger = logging.getLogger(__name__)
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def disable_vt_switching() -> bool:
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"""Best-effort disable of Ctrl+Alt+Fn VT switching.
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Returns:
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True if setxkbmap was found and the disable command ran (the caller
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should later call :func:`restore_vt_switching`); False if setxkbmap
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is unavailable and VT switching could not be touched.
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"""
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setxkbmap = shutil.which("setxkbmap")
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if setxkbmap is None:
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_logger.warning("setxkbmap not found; VT switching stays enabled")
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return False
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subprocess.run([setxkbmap, "-option", "srvrkeys:none"], check=False)
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return True
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def restore_vt_switching() -> None:
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"""Re-enable VT switching. Safe to call even if it was never disabled."""
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setxkbmap = shutil.which("setxkbmap")
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if setxkbmap is not None:
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subprocess.run([setxkbmap, "-option", ""], check=False)
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