75 lines
2.1 KiB
Text
75 lines
2.1 KiB
Text
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#!/bin/sh
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# Restart `gnome-shell` in place,
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# preserving the session and all windows
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#
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# Usually survives, but treat it like a logout:
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# save your work first, because a crash on the way down can end the session
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#
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# Debian normally forbids starting/stopping this unit by hand;
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# we allow it via a user-level drop-in (installed on first run)
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set -eu
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if [ "${XDG_SESSION_TYPE:-}" != "x11" ]; then
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echo "gnome-shell-restart: only works on X11, not on ${XDG_SESSION_TYPE:-unknown}" >&2
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exit 1
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fi
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_UNIT="org.gnome.Shell@x11.service"
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_DROPIN_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user/$_UNIT.d"
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_DROPIN_FILE="$_DROPIN_DIR/allow-restart.conf"
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if [ ! -f "$_DROPIN_FILE" ] || ! grep -q "SuccessExitStatus" "$_DROPIN_FILE"; then
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mkdir -p "$_DROPIN_DIR"
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cat > "$_DROPIN_FILE" << 'EOF'
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# Written by ~/.local/bin/gnome-shell-restart
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# Debian forbids starting and stopping this unit by hand
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# to protect Wayland sessions, where the shell cannot restart in place
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# => We are on X11
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[Unit]
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RefuseManualStart=no
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RefuseManualStop=no
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# The old shell sometimes crashes while shutting down.
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#
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# Without this line, `systemd` treats that crash as a real failure
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# and ends the whole session (i.e., logs us out)
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#
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# => We count a segfault as a normal exit
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#
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# If the shell truly keeps crashing, the start limit still ends the session
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[Service]
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SuccessExitStatus=1 SEGV
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EOF
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systemctl --user daemon-reload
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fi
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# The unit allows at most 3 starts per 15 seconds
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# and one restart too many counts as a failure and logs us out
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# => Refuse to restart again too soon after the last one
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_STARTED="$(systemctl --user show -p ActiveEnterTimestamp --value "$_UNIT")"
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if [ -n "$_STARTED" ]; then
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_AGE=$(( $(date +%s) - $(date -d "$_STARTED" +%s) ))
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if [ "$_AGE" -lt 20 ]; then
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echo "gnome-shell-restart: last shell start was only ${_AGE}s ago" >&2
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echo "gnome-shell-restart: refusing to trip the start limit (wait $(( 20 - _AGE ))s)" >&2
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exit 1
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fi
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fi
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# Forget any earlier failure, so it does not block this restart
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systemctl --user reset-failed "$_UNIT" 2> /dev/null || true
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exec systemctl --user restart "$_UNIT"
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