Eric WagonerandClaude Opus 5.5
567590464e
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG
43 lines
1.9 KiB
Bash
43 lines
1.9 KiB
Bash
#!/usr/bin/env bash
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# The notice every game of Kestrel's Hall shows at the top of its pages.
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# Each site serves /var/lib/hall/announcement.json at /hall/announcement.json;
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# a page checks it on load and every few minutes. Run on the host as root:
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# hall-announce "Kestrel's Hall is down for five minutes of maintenance" --at "2026-09-30 11:00 UTC" [--until "2026-09-30 11:15 UTC"]
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# hall-announce --show
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# hall-announce --clear
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# --at is when it happens, told in each reader's own time; --until is when the
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# notice stops showing (an hour after --at when not given).
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set -euo pipefail
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FILE=/var/lib/hall/announcement.json
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# No notice is an empty one, {}, never a missing file: a page's check for a missing file
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# is a failed request, and the browser reports it in every visitor's console.
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case "${1:-}" in
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--clear) mkdir -p "$(dirname "$FILE")"; echo '{}' > "$FILE.tmp"; chmod 644 "$FILE.tmp"; mv "$FILE.tmp" "$FILE"; echo "cleared."; exit 0 ;;
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--show) if grep -q '"text"' "$FILE" 2>/dev/null; then cat "$FILE"; else echo "no announcement."; fi; exit 0 ;;
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''|-*) sed -n '2,9p' "$0" | sed 's/^# \{0,1\}//'; exit 2 ;;
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esac
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TEXT="$1"; shift
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AT=""; UNTIL=""
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while [ $# -gt 0 ]; do
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case "$1" in
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--at) AT="$(date -u -d "$2" +%Y-%m-%dT%H:%M:%SZ)"; shift 2 ;;
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--until) UNTIL="$(date -u -d "$2" +%Y-%m-%dT%H:%M:%SZ)"; shift 2 ;;
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*) echo "unknown option: $1" >&2; exit 2 ;;
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esac
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done
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[ -n "$AT" ] && [ -z "$UNTIL" ] && UNTIL="$(date -u -d "$AT + 1 hour" +%Y-%m-%dT%H:%M:%SZ)"
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mkdir -p "$(dirname "$FILE")"
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# A new id each time, so a reader who dismissed the last notice still sees this one.
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TEXT="$TEXT" AT="$AT" UNTIL="$UNTIL" ID="$(date -u +%Y%m%dT%H%M%S)" python3 -c '
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import json, os
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a = {"id": os.environ["ID"], "text": os.environ["TEXT"]}
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if os.environ["AT"]: a["at"] = os.environ["AT"]
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if os.environ["UNTIL"]: a["until"] = os.environ["UNTIL"]
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print(json.dumps(a))' > "$FILE.tmp"
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chmod 644 "$FILE.tmp"
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mv "$FILE.tmp" "$FILE"
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cat "$FILE"
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