#!/bin/bash
#
# Listen for when programs ask systemd to start/stop user services
# and attempt to start/stop a dinit service with the same name.
#
# Written by Bob Funk.
# Rewritten by Nathaniel Russell for sysvinit

# Monitor loop for org.freedesktop.systemd1.Manager:
monitor_service=0
service_action=""
log_file="/var/log/service_monitor.log"

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

dbus-monitor --session "destination='org.freedesktop.systemd1',interface='org.freedesktop.systemd1.Manager'" | while read -r line; do
    if [ "$monitor_service" = "1" ]; then
        # Extract service name, which is on the line following StartUnit/StopUnit:
        service_name="$(echo "$line" | awk -F\" '{print $2}' | sed 's/\.service//')"
        
        # Attempt to start/stop the service
        if ! /etc/config/"$service_name" "$service_action" 2>/dev/null; then
            log "Failed to ${service_action} ${service_name}"
        else
            log "Successfully executed ${service_action} on ${service_name}"
        fi

        # Reset variables
        monitor_service=0
        service_action=""
    
    # Check for StartUnit and StopUnit signals
    elif echo "$line" | grep -q 'StartUnit'; then
        monitor_service=1
        service_action="start"
    elif echo "$line" | grep -q 'StopUnit'; then
        monitor_service=1
        service_action="stop"
    fi
done