computer-playbook/roles/system-maintenance-service-freezer/files/system-maintenance-service-freezer.py

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import argparse
import subprocess
import time
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import os
from datetime import datetime
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def parse_time_to_seconds(time_str):
"""Convert time string 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:
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raise ValueError("Invalid time unit")
return int(number) * units[unit]
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def service_file_exists(service_name, service_type="service"):
"""Check if a systemd service file exists."""
# Paths where service files can be stored
path = "/etc/systemd/system/"
service_file_name = service_name + "." + service_type
full_path = os.path.join(path, service_file_name)
print(f"Checking {full_path}") # Added debug output
if os.path.isfile(full_path):
return True
else:
print(f"File not found.") # Debug output if file is not found
def check_service_active(service_name):
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"""Check if a service is active or activating."""
result = subprocess.run(['systemctl', 'is-active', service_name], stdout=subprocess.PIPE)
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service_status = result.stdout.decode('utf-8').strip()
return_value=service_status in ['active', 'activating']
if return_value:
print(f"Service {service_name} is active.");
else:
print(f"Service {service_name} is not active.");
return return_value
def check_any_service_active(services):
"""Check if any service in the list is active or activating."""
for service_name in services:
if check_service_active(service_name):
return True
return False
def stop_timer(service):
# Stop and disable the corresponding timer, if it exists
if service_file_exists(service,"timer"):
timer_name = service + ".timer"
subprocess.run(['systemctl', 'stop', timer_name])
subprocess.run(['systemctl', 'disable', timer_name])
print(f"{timer_name} stopped and disabled.")
else:
print(f"No timer to stop.")
def filter_services(services, ignored_services):
"""
Removes all services from the 'services' list that are contained in 'ignored_services'.
:param services: List of services.
:param ignored_services: List of services to be ignored.
:return: Filtered list of services.
"""
return [service for service in services if service not in ignored_services]
def stop_all_timers(services):
for service in services:
stop_timer(service)
def wait_for_all_services_to_stop(filtered_services,max_attempts,attempt,break_time_sec):
for service in filtered_services:
while check_service_active(service):
attempt += 1
if attempt > max_attempts:
raise Exception(f"Error: Maximum attempts ({max_attempts}) reached. Exit.")
print(f"{datetime.now().isoformat()}#{attempt}/{max_attempts}: Waiting for {break_time_sec} seconds for {service} to stop...")
time.sleep(break_time_sec)
return attempt
def freeze(filtered_services,timeout_sec):
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break_time_sec=5
attempt=0
max_attempts=timeout_sec/break_time_sec
# This guaranties that no service will be started in the between time
while check_any_service_active(filtered_services):
stop_all_timers(filtered_services)
attempt=wait_for_all_services_to_stop(filtered_services,max_attempts,attempt,break_time_sec)
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print("\nAll required services have stopped.")
def defrost(filtered_services):
for service in filtered_services:
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print(f"\nUnfreezing: {service}")
if service_file_exists(service,"timer"):
# Start and enable the corresponding timer, if it exists
timer_name = service + ".timer"
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subprocess.run(['systemctl', 'start', timer_name])
subprocess.run(['systemctl', 'enable', timer_name])
print(f"{timer_name} started and enabled.")
else:
print(f"No timer to activate.")
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print("\nAll required services are started.")
def main(services, ignored_services, action, timeout_sec):
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}")
if action == 'freeze':
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print("Freezing services.");
freeze(filtered_services, timeout_sec)
elif action == 'defrost':
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print("Unfreezing services.");
defrost(filtered_services)
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print('\nOverview:')
subprocess.run(['systemctl', 'list-timers'])
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='freezes and defrost systemctl services and timers')
parser.add_argument('action', choices=['freeze', 'defrost'], help='Action to perform: freeze or defrost services.')
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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 freezing services (e.g., 1h, 30min, 45s)', default='1h')
args = parser.parse_args()
services = args.services
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ignored_services = args.ignore if args.ignore else []
timeout_seconds = parse_time_to_seconds(args.timeout)
main(services, ignored_services, args.action, timeout_seconds)