computer-playbook/roles/system-maintenance-lock/files/system-maintenance-lock.py

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import argparse
import subprocess
import time
import os
from datetime import datetime
# Global variable definition
BREAK_TIME_SECONDS = 5
class AttemptException(Exception):
"""A custom exception for maximum number of attempts."""
pass
def parse_time_to_seconds(time_str):
"""
Convert a time string (e.g., '1h', '30min', '45s') to seconds.
"""
units = {"s": 1, "min": 60, "h": 3600}
if time_str[-3:] in units:
number, unit = time_str[:-3], time_str[-3:]
elif time_str[-2:] in units:
number, unit = time_str[:-2], time_str[-2:]
elif time_str[-1:] in units:
number, unit = time_str[:-1], time_str[-1:]
else:
raise ValueError("Invalid time unit")
return int(number) * units[unit]
def check_service_active(service_name):
"""
Check if a systemd service is currently active or activating.
"""
result = subprocess.run(['systemctl', 'is-active', service_name], stdout=subprocess.PIPE)
service_status = result.stdout.decode('utf-8').strip()
is_active = service_status in ['active', 'activating']
print(f"Service {service_name} is {'active' if is_active else 'not active'}.")
return is_active
def check_any_service_active(services):
"""
Check if any service in a given list is active or activating.
"""
return any(check_service_active(service) for service in services)
def filter_services(services, ignored_services):
"""
Filter out services that are in the ignored_services list from services list.
"""
return [service for service in services if service not in ignored_services]
def wait_for_all_services_to_stop(filtered_services, max_attempts, attempt):
"""
Wait until all services in the list have stopped, with a maximum number of attempts.
"""
for service in filtered_services:
while check_service_active(service):
attempt += 1
if attempt > max_attempts:
raise AttemptException(f"Maximum attempts ({max_attempts}) reached. Exiting.")
print(f"{datetime.now().isoformat()}#{attempt}/{max_attempts}: Waiting for {BREAK_TIME_SECONDS} seconds for {service} to stop...")
time.sleep(BREAK_TIME_SECONDS)
return attempt
def get_max_attempts(timeout_sec):
return timeout_sec // BREAK_TIME_SECONDS
def main(services, ignored_services, timeout_sec):
"""
Main function to process the command-line arguments and perform actions.
"""
filtered_services = filter_services(services, ignored_services)
print(f"Services to handle: {services}")
print(f"Services to ignore: {ignored_services}")
print(f"Services filtered: {filtered_services}")
print("Waiting for services to stop.")
attempt = 0
max_attempts = get_max_attempts(timeout_sec)
while check_any_service_active(filtered_services):
attempt = wait_for_all_services_to_stop(filtered_services, max_attempts, attempt)
print("All required services have stopped.")
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Blocks the code execution as long as defined services are running. Terminates with 0 when all services stopped')
parser.add_argument('services', nargs='+', help='List of services to apply the action to.')
parser.add_argument('--ignore', nargs='*', help='List of services to ignore in the action.', default=[])
parser.add_argument('--timeout', help='Timeout for lock actions (e.g., 1h, 30min, 45s).', default='1min')
args = parser.parse_args()
services = args.services
ignored_services = args.ignore if args.ignore else []
timeout_seconds = parse_time_to_seconds(args.timeout)
main(services, ignored_services, timeout_seconds)