#!/bin/bash
# Bail if other agents are alive in the state dir.
# $1 = this agent's pid file name (e.g. pid-12345)
# cwd = state dir
#
# Exit 0 = continue, exit 1 = bail

shopt -s nullglob

my_pid_file="$1"

for f in pid-*; do
    [[ $f == $my_pid_file ]] && continue
    pid="${f#pid-}"
    if kill -0 "$pid" 2>/dev/null; then
        exit 1  # competing agent is alive
    else
        rm -f "$f"  # stale pid file, clean up
    fi
done

exit 0