feat(discord): systemd user service with a supervised run; brakes exit 3 and are never retried (#1509)
QUEUE row 17, MVP iteration 2. scripts/discord-service.sh renders and installs mosaic-discord@<binding> from packages/discord/systemd/. The unit's main process is `run --supervised`, which applies the new recover policy first: a lock whose owner is gone is cleared and only the STOP written for that is removed; an operator STOP or a held binding refuses with exit 3, which RestartPreventExitStatus never retries. `recover` is also a CLI verb. First cut used ExecStartPre and looped live, since systemd honours the never-retry status only from the main process; replaced and re-verified before any message traffic. Suite 40/40, 95 node tests. Co-Authored-By: Claude Fable 5.1 <[email protected]>
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Claude Fable 5.1
Executable
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#!/usr/bin/env bash
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# `scripts/discord-service.sh render|install|uninstall|status [<binding>]`:
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# the systemd user unit that supervises `scripts/discord.sh run <binding>`.
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# The template is packages/discord/systemd/[email protected]; the
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# rendered unit is [email protected] in the systemd user directory, one
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# instance per binding (mosaic-discord@<binding>). Nothing here reads the
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# binding or the token. See packages/discord/README.md, "Service unit".
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#
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# render print the rendered unit on stdout
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# install [--dir DIR] [--no-reload]
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# write the unit (write to a temp file, then
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# rename) and run `systemctl --user daemon-reload`
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# uninstall [--dir DIR] [--no-reload]
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# remove the unit; refuses while an instance is active
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# status <binding> unit state, STOP and run.lock for one binding
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#
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# Exit codes: 0 ok, 1 operation failed, 4 usage.
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set -euo pipefail
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REPO="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
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TEMPLATE="$REPO/packages/discord/systemd/[email protected]"
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UNIT_NAME="[email protected]"
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USAGE="usage: scripts/discord-service.sh render | install [--dir DIR] [--no-reload] | uninstall [--dir DIR] [--no-reload] | status <binding>"
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die() { echo "discord-service: $*" >&2; exit 1; }
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usage() { echo "$USAGE" >&2; exit 4; }
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render() {
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[ -f "$TEMPLATE" ] || die "template missing: $TEMPLATE"
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local node_dir
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node_dir="$(dirname "$(command -v node || true)")"
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[ -n "$node_dir" ] && [ "$node_dir" != "." ] || die "node not found on PATH"
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local path="/usr/local/bin:/usr/bin:/bin"
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case ":$path:" in *":$node_dir:"*) ;; *) path="$node_dir:$path" ;; esac
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case "$REPO" in *@*|*'|'*) die "repository path contains a character the template cannot carry: $REPO" ;; esac
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sed -e "s|@REPO@|$REPO|g" -e "s|@PATH@|$path|g" "$TEMPLATE"
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}
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# Parse --dir and --no-reload for install and uninstall.
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UNIT_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user"
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RELOAD=1
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parse_flags() {
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while [ $# -gt 0 ]; do
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case "$1" in
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--dir) [ $# -ge 2 ] || usage; UNIT_DIR="$2"; shift 2 ;;
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--no-reload) RELOAD=0; shift ;;
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*) usage ;;
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esac
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done
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}
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install_unit() {
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parse_flags "$@"
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mkdir -p "$UNIT_DIR"
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local target="$UNIT_DIR/$UNIT_NAME" tmp
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tmp="$(mktemp "$UNIT_DIR/.$UNIT_NAME.XXXXXX")"
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render > "$tmp"
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chmod 0644 "$tmp"
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if [ -f "$target" ] && cmp -s "$tmp" "$target"; then
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rm -f "$tmp"
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echo "unchanged: $target"
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else
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mv -f "$tmp" "$target"
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echo "written: $target"
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fi
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if [ "$RELOAD" = 1 ]; then
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systemctl --user daemon-reload || die "daemon-reload failed"
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echo "daemon-reload done"
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fi
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cat <<MSG
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next, for one binding:
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systemctl --user enable --now mosaic-discord@<binding> start now and at login
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systemctl --user status mosaic-discord@<binding>
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journalctl --user -u mosaic-discord@<binding> -f the connector's log
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systemctl --user stop mosaic-discord@<binding> SIGTERM; restartable
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scripts/discord.sh stop <binding> the brake: writes STOP, the unit stays down until STOP is removed
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survive logout and reboot only with lingering on: loginctl enable-linger $USER
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MSG
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}
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uninstall_unit() {
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parse_flags "$@"
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local target="$UNIT_DIR/$UNIT_NAME"
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if [ "$RELOAD" = 1 ]; then
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local active
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active="$(systemctl --user list-units --no-legend --plain 'mosaic-discord@*' 2>/dev/null | awk '$3 == "active" || $3 == "activating" || $3 == "deactivating" {print $1}')"
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[ -z "$active" ] || die "refusing: instance(s) still running: $(echo "$active" | tr '\n' ' ')stop them first"
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fi
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if [ -f "$target" ]; then
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rm -f "$target"
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echo "removed: $target"
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else
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echo "absent: $target"
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fi
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if [ "$RELOAD" = 1 ]; then
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systemctl --user daemon-reload || die "daemon-reload failed"
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echo "daemon-reload done"
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fi
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}
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status_unit() {
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[ $# -eq 1 ] || usage
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local binding="$1"
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case "$binding" in ''|*[!A-Za-z0-9_-]*) die "binding name must be [A-Za-z0-9_-]+" ;; esac
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local unit="mosaic-discord@$binding.service"
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echo "unit: $unit"
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echo " enabled: $(systemctl --user is-enabled "$unit" 2>&1 || true)"
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echo " active: $(systemctl --user is-active "$unit" 2>&1 || true)"
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systemctl --user show "$unit" -p MainPID -p NRestarts -p ExecMainStartTimestamp -p Result 2>/dev/null | sed 's/^/ /'
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local config="${XDG_CONFIG_HOME:-$HOME/.config}/mosaic-dev/config.json"
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local data_root
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data_root="$(node -e 'const c=JSON.parse(require("fs").readFileSync(process.argv[1],"utf8")); process.stdout.write(String(c.dataRoot||""))' "$config" 2>/dev/null || true)"
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if [ -z "$data_root" ]; then
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echo " journal: dataRoot not readable from $config"
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return 0
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fi
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data_root="${data_root/#\~/$HOME}"
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local dir="$data_root/discord/$binding"
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if [ -f "$dir/STOP" ]; then
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echo " STOP: present ($(tail -n 1 "$dir/STOP"))"
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else
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echo " STOP: absent"
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fi
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if [ -d "$dir/run.lock" ]; then
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echo " run.lock: present$( [ -f "$dir/run.lock/owner.json" ] && printf ' (owner pid %s)' "$(node -e 'process.stdout.write(String(JSON.parse(require("fs").readFileSync(process.argv[1],"utf8")).pid))' "$dir/run.lock/owner.json" 2>/dev/null || echo '?')" )"
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else
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echo " run.lock: absent"
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fi
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}
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[ $# -ge 1 ] || usage
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cmd="$1"; shift
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case "$cmd" in
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render) [ $# -eq 0 ] || usage; render ;;
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install) install_unit "$@" ;;
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uninstall) uninstall_unit "$@" ;;
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status) status_unit "$@" ;;
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-h|--help) echo "$USAGE" ;;
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*) usage ;;
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esac
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