#!/bin/sh
# The privileged adapter writes configuration only after this stop completes.
DAEMON=/usr/sbin/snmpd
CONFIG=/etc/snmp/snmpd.conf
PIDFILE=/var/run/snmpd.pid
SNMPDRUN=yes
SNMPDOPTS='-Lsd -Lf /dev/null -p /var/run/snmpd.pid'
export SNMP_PERSISTENT_DIR=/var/lib/net-snmp
[ ! -r /etc/default/snmpd ] || . /etc/default/snmpd

is_running() {
    [ -r "$PIDFILE" ] || return 1
    pid="$(cat "$PIDFILE")"
    [ -n "$pid" ] && kill -0 "$pid" 2>/dev/null
}
start_service() {
    [ "$SNMPDRUN" = yes ] && [ -r "$CONFIG" ] || return 0
    grep -Eq '^[[:space:]]*agentAddress[[:space:]]+' "$CONFIG" || return 0
    if is_running; then return 0; fi
    mkdir -p "$SNMP_PERSISTENT_DIR" || return 1
    chmod 0700 "$SNMP_PERSISTENT_DIR" || return 1
    start-stop-daemon -q -S -x "$DAEMON" -- $SNMPDOPTS
}
stop_service() {
    if ! is_running; then return 0; fi
    stopped_pid="$pid"
    start-stop-daemon -q -K -o -p "$PIDFILE" -x "$DAEMON" || return 1
    attempts=0
    while kill -0 "$stopped_pid" 2>/dev/null; do
        attempts=$((attempts + 1))
        [ "$attempts" -lt 50 ] || return 1
        sleep 0.1
    done
    rm -f "$PIDFILE"
}
case "$1" in
    start) start_service ;;
    stop) stop_service ;;
    restart) stop_service && start_service ;;
    reload|force-reload) if is_running; then kill -HUP "$pid"; fi ;;
    status) is_running ;;
    *) echo "Usage: $0 {start|stop|restart|reload|force-reload|status}" >&2; exit 1 ;;
esac