68 lines
2.8 KiB
Text
68 lines
2.8 KiB
Text
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#!/bin/sh
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# Report a hardware button edge to the session authority. That is all it does.
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#
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# It replaces `blueline-power-button`, which was policy in shell script: it read
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# its own copy of the panel state, asked the SHELL to lock over `qs ipc`, polled
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# `session state` twenty times at 100 ms grepping JSON for `"locked": true`, and
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# then called `blueline-screen-toggle off` itself. Three separate problems:
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#
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# 1. It blanked the panel without going through sessiond's `request_blank()`,
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# so LOCK-DPMS-LESSONS §1 ("every path to a dark panel routes through it —
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# an invariant, not a coincidence") had a hole in it, and the hole was the
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# most-used control on the device.
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# 2. It carried its own copy of the lock-then-blank ordering, which is the
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# exact duplication DEVICE-STATE-MACHINE §1 is about: seven blind actors,
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# three of which can turn the screen off.
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# 3. It could only ever see one edge, so it could never tell a tap from a
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# hold. Gesture recognition needs time, and a process that exits cannot
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# hold any.
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#
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# Now the machine owns all three. This reports `down` and `up`; sessiond
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# accumulates them into tap / double / triple / hold and decides what, if
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# anything, that means.
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#
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# Wire it up in hyprland.lua as a PAIR — press and release:
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#
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# hl.bind( "XF86PowerOff", hl.dsp.exec_cmd("souveraine-button power down"), { locked = true })
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# hl.bindr("XF86PowerOff", hl.dsp.exec_cmd("souveraine-button power up"), { locked = true })
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#
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# Only reporting `down` gives you a machine that thinks the button is held
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# forever: the hold threshold passes, `Hold` fires, and no `Tap` ever resolves.
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set -eu
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button=${1:-power}
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edge=${2:-down}
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case "$edge" in
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down | up) ;;
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*)
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echo "usage: souveraine-button <power|volume_up|volume_down> <down|up>" >&2
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exit 2
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;;
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esac
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runtime=${XDG_RUNTIME_DIR:-/run/user/$(id -u)}
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sock="$runtime/souveraine/sessiond.sock"
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line="{\"op\":\"button\",\"button\":\"$button\",\"edge\":\"$edge\"}"
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# Fire and forget, with a hard timeout. A button press must never block on the
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# authority being slow — the user is holding the button and the phone must not
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# feel stuck. Losing an edge degrades to a missed gesture, which is recoverable;
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# hanging here is not.
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#
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# No nc/socat on this device (checked), so this is Python's stdlib or nothing.
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exec timeout 1 python3 -c '
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import socket, sys
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sock, line = sys.argv[1], sys.argv[2]
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try:
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s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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s.settimeout(0.8)
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s.connect(sock)
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s.sendall((line + "\n").encode())
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except Exception:
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# sessiond down. Say so in the journal and drop it: a button reporter that
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# falls back to acting on its own is the thing this file exists to delete.
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print("sessiond unreachable; button edge dropped: " + line, file=sys.stderr)
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sys.exit(1)
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' "$sock" "$line"
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