jochen
838e1c2616
Owns both bars and their icons, the bar blocks as an i3 drop-in; the battery, GPU and headset blocks leave (hardware and a person's devices), the weather needs no key; the update count and the bar watchdog become module code, the watchdog started once per session. Go tools reload, blocks, block-run and themes.
65 lines
2.3 KiB
Bash
Executable File
65 lines
2.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# i3bar-watchdog [session-pid] (module i3status-rust, novox/hq ADR 0208): respawns a bar that died.
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#
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# i3 starts one i3bar per `bar { }` block and never restarts one that exits, and a reload does not
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# either. Changing the monitor setup reliably kills the bar that owns the tray. This brings back the
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# one missing i3bar, without restarting i3, and logs the outputs at that moment: the evidence for the
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# cause, which is i3bar's.
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#
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# Started once per session from the session's start, with the session's own pid; it ends when that
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# process does. Adopted from the predecessor's i3-bar-watchdog user unit of 2026-10-04.
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set -uo pipefail
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session_pid="${1:-}"
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interval="${I3_BAR_WATCHDOG_INTERVAL:-5}"
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# Two misses in a row before acting: an i3 restart tears every bar down and starts them again.
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confirm="${I3_BAR_WATCHDOG_CONFIRM:-2}"
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# Never respawn the same bar more often than this, so a bar that dies at once is not a tight loop.
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cooldown="${I3_BAR_WATCHDOG_COOLDOWN:-30}"
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log() { printf 'i3bar-watchdog: %s\n' "$*" >&2; }
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for tool in i3-msg i3bar pgrep; do
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command -v "$tool" >/dev/null 2>&1 || {
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log "$tool is missing; not watching"
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exit 1
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}
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done
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declare -A missed=() fixed=()
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bar_ids() { i3-msg -t get_bar_config 2>/dev/null | grep -oE '"[^"]+"' | tr -d '"'; }
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outputs() { xrandr --listmonitors 2>/dev/null | tail -n +2 | awk '{print $2" "$3}' | tr '\n' ' '; }
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session_alive() { [ -z "$session_pid" ] || kill -0 "$session_pid" 2>/dev/null; }
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while session_alive; do
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sleep "$interval"
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socket="$(i3 --get-socketpath 2>/dev/null)"
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[ -n "$socket" ] && [ -S "$socket" ] || continue
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ids="$(bar_ids)"
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[ -n "$ids" ] || continue
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while read -r id; do
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[ -n "$id" ] || continue
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if pgrep -u "$EUID" -f -- "i3bar --bar_id=$id" >/dev/null 2>&1; then
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missed[$id]=0
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continue
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fi
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missed[$id]=$((${missed[$id]:-0} + 1))
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[ "${missed[$id]}" -ge "$confirm" ] || continue
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now="$(date +%s)"
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if [ $((now - ${fixed[$id]:-0})) -lt "$cooldown" ]; then
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continue
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fi
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log "$id is gone; respawning it. Outputs now: $(outputs)"
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nohup i3bar --bar_id="$id" --socket="$socket" >/dev/null 2>&1 &
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disown 2>/dev/null || true
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fixed[$id]="$now"
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sleep 2
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if pgrep -u "$EUID" -f -- "i3bar --bar_id=$id" >/dev/null 2>&1; then
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missed[$id]=0
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else
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log "$id exited within 2s of respawning; check its status_command"
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fi
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done <<<"$ids"
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done
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