computer-playbook/roles/cleanup-backups-service/files/cleanup-backups.py

110 lines
5.5 KiB
Python

import psutil
import shutil
import os
import argparse
import subprocess
# Validating arguments
parser = argparse.ArgumentParser()
parser.add_argument('--maximum-backup-size-percent', type=int, dest='maximum_backup_size_percent',required=True, choices=range(0,100), help="The directory from which the data should be encrypted.")
parser.add_argument('--backups-folder-path',type=str,dest='backups_folder_path',required=True, help="The folder in which the backups are stored")
args = parser.parse_args()
def print_used_disc_space(backups_folder_path):
print("%d %% of disk %s are used" % (psutil.disk_usage(backups_folder_path).percent,backups_folder_path))
def is_directory_used_by_another_process(directory_path):
command= "lsof " + directory_path
process = subprocess.Popen([command], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
output, error = process.communicate()
# @See https://stackoverflow.com/questions/29841984/non-zero-exit-code-for-lsof
if process.wait() > bool(0):
return False
return True
def isSmallerThenMaximumBackupSize(maximum_backup_size_percent,backups_folder_path):
current_disc_usage_percent=psutil.disk_usage(backups_folder_path).percent
return current_disc_usage_percent > maximum_backup_size_percent
def isDirectoryDeletable(version, versions, version_path):
print("Checking directory %s ..." % (version_path))
if version == versions[-1]:
print("Directory %s contains the last version of the backup. Skipped." % (version_path))
return False
if is_directory_used_by_another_process(version_path):
print("Directory %s is used by another process. Skipped." % (version_path))
return False
def deleteVersion(version_path, backups_folder_path):
print("Deleting %s to free space." % (version_path))
current_disc_usage_percent=psutil.disk_usage(backups_folder_path).percent
shutil.rmtree(version_path)
new_disc_usage_percent=psutil.disk_usage(backups_folder_path).percent
difference_percent=current_disc_usage_percent-new_disc_usage_percent
print("{:6.2f} %% of drive freed".format(difference_percent))
def count_total_application_directories(backups_folder_path):
total_app_directories = 0
for host_backup_directory_name in os.listdir(backups_folder_path):
host_backup_directory_path = os.path.join(backups_folder_path, host_backup_directory_name)
total_app_directories += sum(os.path.isdir(os.path.join(host_backup_directory_path, d)) for d in os.listdir(host_backup_directory_path))
return total_app_directories
def count_total_version_folders(backups_folder_path):
total_version_folders = 0
for host_backup_directory_name in os.listdir(backups_folder_path):
host_backup_directory_path = os.path.join(backups_folder_path, host_backup_directory_name)
for application_directory in os.listdir(host_backup_directory_path):
versions_directory = os.path.join(host_backup_directory_path, application_directory)
total_version_folders += sum(os.path.isdir(os.path.join(versions_directory, d)) for d in os.listdir(versions_directory))
return total_version_folders
def average_version_directories_per_application(backups_folder_path,blur=-1):
total_app_directories = count_total_application_directories(backups_folder_path)
total_version_folders = count_total_version_folders(backups_folder_path)
if total_app_directories == 0:
return 0
average = total_version_folders / total_app_directories
return int(average) - blur
def getAmountOfIteration(versions,average_version_directories_per_application):
return len(versions) - average_version_directories_per_application
def deleteIteration(backups_folder_path,average_version_directories_per_application):
for host_backup_directory_name in os.listdir(backups_folder_path):
host_backup_directory_path = os.path.join(backups_folder_path, host_backup_directory_name)
for application_directory in os.listdir(host_backup_directory_path):
# The directory which contains all backup versions of the application
versions_directory = os.path.join(host_backup_directory_path, application_directory) + "/"
versions = os.listdir(versions_directory)
versions.sort(reverse=False)
version_iteration=0
while version_iteration < getAmountOfIteration(versions,average_version_directories_per_application):
print_used_disc_space(backups_folder_path)
version = versions[version_iteration]
version_path=os.path.join(versions_directory, version)
if isDirectoryDeletable(version, versions, version_path):
deleteVersion(version_path, backups_folder_path)
version_iteration += 1
backups_folder_path=args.backups_folder_path
maximum_backup_size_percent=args.maximum_backup_size_percent
itteration_counter = 1
while isSmallerThenMaximumBackupSize(maximum_backup_size_percent, backups_folder_path):
if itteration_counter > 200:
raise Exception("Iteration limit exceeded")
print(f"Delete Iteration: {itteration_counter}")
average_version_directories = average_version_directories_per_application(backups_folder_path)
print(f"Average version directories per application directory: {average_version_directories}")
deleteIteration(backups_folder_path, average_version_directories)
itteration_counter += 1
print_used_disc_space(backups_folder_path)
print("Cleaning up finished.")