vmmgr/usr/lib/python3.6/lxcmgr/svcmgr.py

# -*- coding: utf-8 -*-

import os
import subprocess

from .paths import AUTOSTART_SVC_DIR, SERVICE_DIR, STARTED_SVC_DIR
from .templates import SERVICE

def create_service(app, container, image):
    depends = ' '.join(image['depends']) if 'depends' in image else ''
    # Add ready check to start_post
    # This could arguably be better done via some template engine, but introducing one for 2 template files seems like overkill
    start_post = '\nstart_post() {{\n    timeout -t 60 lxc-attach {} -- sh -c \'until {}; do sleep 0.1; done\'\n}}\n'.format(container, image['ready']) if 'ready' in image else ''
    service_file = os.path.join(SERVICE_DIR, container)
    with open(service_file, 'w') as f:
        f.write(SERVICE.format(app=app, container=container, depends=depends, start_post=start_post))
    os.chmod(service_file, 0o755)
    update_services()

def delete_service(service):
    if is_service_started(service):
        stop_service(service)
    if is_service_autostarted(service):
        update_service_autostart(service, False)
    try:
        os.unlink(os.path.join(SERVICE_DIR, service))
    except FileNotFoundError:
        pass
    update_services()

def update_services():
    subprocess.run(['/sbin/rc-update', '-u'], check=True)

def start_service(service):
    if not is_service_started(service):
        subprocess.run(['/sbin/service', service, 'stop'], check=True)

def stop_service(service):
    if is_service_started(service):
        subprocess.run(['/sbin/service', service, 'stop'], check=True)

def is_service_started(self, app):
    # Check OpenRC service status without calling any binary
    return os.path.exists(os.path.join(STARTED_SVC_DIR, app))

def is_service_autostarted(self, app):
    # Check OpenRC service enablement
    return os.path.exists(os.path.join(AUTOSTART_SVC_DIR, app))

def update_service_autostart(self, service, enabled):
    # Add/remove the app to OpenRC default runlevel
    subprocess.run(['/sbin/rc-update', 'add' if enabled else 'del', service])