worktree-gc-daemon

#!/usr/bin/env bash
# Worktree Garbage Collection Daemon
# Runs periodically to clean up abandoned worktrees

set -euo pipefail

SUPERPOWERS_LIB="${HOME}/.config/superpowers/lib"
WORKTREE_MANAGER="${SUPERPOWERS_LIB}/worktree-manager"
DAEMON_PID_FILE="/tmp/superpowers-worktree-gc.pid"
DAEMON_LOCK_FILE="/tmp/superpowers-worktree-gc.lock"
LOG_FILE="${HOME}/.config/superpowers/worktree-gc.log"

# Ensure log directory exists
mkdir -p "$(dirname "$LOG_FILE")"

# Handle shutdown signals
RUNNING=1
shutdown() {
    log "Daemon shutting down"
    RUNNING=0
}
trap 'shutdown' SIGTERM SIGINT

# Atomic lock acquisition using flock
exec 200>"$DAEMON_LOCK_FILE"
if ! flock -n 200; then
    echo "Daemon already running (lock held)" >&2
    exit 0
fi

# Cleanup on exit
trap 'flock -u 200; rm -f "$DAEMON_PID_FILE"' EXIT

# Write PID while holding lock
echo $$ > "$DAEMON_PID_FILE"

log() {
    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" >> "$LOG_FILE"
}

log "Worktree GC daemon started (PID: $$)"

# Main loop
while [ "$RUNNING" = "1" ]; do
    # Detect status changes
    if [ -x "$WORKTREE_MANAGER" ]; then
        "$WORKTREE_MANAGER" detect >> "$LOG_FILE" 2>&1 || true
        
        # Run garbage collection
        "$WORKTREE_MANAGER" gc >> "$LOG_FILE" 2>&1 || true
    fi
    
    # Sleep for 1 hour (in short intervals to allow graceful shutdown)
    for i in $(seq 1 360); do
        if [ "$RUNNING" = "0" ]; then
            break
        fi
        sleep 10
    done
done