Another big round of refactoring and cleaning...

roles/sys-cln-bkps-service/README.md

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+# Cleanup Backups Service
+
+## Description
+
+This role automates the cleanup of old backups by executing a Python script that deletes outdated backup versions based on disk usage thresholds. It ensures that backup storage does not exceed a defined usage percentage.
+
+## Overview
+
+Optimized for effective disk space management, this role:
+- Installs required packages (e.g. [lsof](https://en.wikipedia.org/wiki/Lsof) and [psutil](https://pypi.org/project/psutil/)) using pacman.
+- Creates a directory for storing cleanup scripts.
+- Deploys a Python script that deletes old backup directories when disk usage is too high.
+- Configures a systemd service to run the cleanup script, with notifications via [sys-alm-compose](../sys-alm-compose/README.md).
+
+## Purpose
+
+The primary purpose of this role is to maintain optimal backup storage by automatically removing outdated backup versions when disk usage exceeds a specified threshold.
+
+## Features
+
+- **Automated Cleanup:** Executes a Python script to delete old backups.
+- **Threshold-Based Deletion:** Removes backups based on disk usage percentage.
+- **Systemd Integration:** Configures a systemd service to run cleanup tasks.
+- **Dependency Integration:** Works in conjunction with related roles for comprehensive backup management.
+
+## Other Resources
+- https://stackoverflow.com/questions/48929553/get-hard-disk-size-in-python

roles/sys-cln-bkps-service/files/sys-cln-backups.py

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+import psutil
+import shutil
+import os
+import argparse
+import subprocess
+import time
+
+# 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
+    
+    print(f"Directory {version_path} can be deleted.")
+    return True
+    
+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):
+    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)
+
+def getAmountOfIteration(versions,average_version_directories_per_application):
+    version_amount=len(versions)
+    amount_of_iterations=(len(versions) +1) - average_version_directories_per_application
+    print(f"Number of existing versions: {version_amount}")
+    print(f"Number of average version directories per application: {average_version_directories_per_application}")
+    print(f"Amount of iterations: {amount_of_iterations}")
+    return amount_of_iterations
+
+def deleteIteration(backups_folder_path,average_version_directories_per_application):
+    for host_backup_directory_name in os.listdir(backups_folder_path):
+        print(f"Iterating over host: {host_backup_directory_name}")
+        host_backup_directory_path = os.path.join(backups_folder_path, host_backup_directory_name)
+        for application_directory in os.listdir(host_backup_directory_path):
+            print(f"Iterating over backup application: {application_directory}")
+            # 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 
+                     
+def check_time_left(start_time, time_limit):
+    """
+    Checks if there is time left within the given time limit.
+    Prints the start time, the current time, and the remaining time.
+
+    :param start_time: The start time of the process.
+    :param time_limit: The total time limit for the process.
+    :return: True if there is time left, False otherwise.
+    """
+    current_time = time.time()
+    elapsed_time = current_time - start_time
+    remaining_time = time_limit - elapsed_time
+
+    # Convert times to readable format
+    start_time_str      =   time.strftime("%H:%M:%S", time.localtime(start_time))
+    current_time_str    =   time.strftime("%H:%M:%S", time.localtime(current_time))
+    remaining_time_str  =   time.strftime("%H:%M:%S", time.gmtime(remaining_time))
+    is_time_left        =   remaining_time > 0
+
+    print(f"Start time: {start_time_str}")
+    print(f"Current time: {current_time_str}")
+    if is_time_left:
+        print(f"Remaining time: {remaining_time_str}")
+
+    return remaining_time > 0
+
+class TimeLimitExceededException(Exception):
+    """Exception raised when the time limit for the process is exceeded."""
+    def __init__(self, message="Time limit exceeded, terminating the process."):
+        self.message = message
+        super().__init__(self.message)
+
+backups_folder_path=args.backups_folder_path
+maximum_backup_size_percent=args.maximum_backup_size_percent
+start_time = time.time()
+time_limit = 3600
+itteration_counter = 1
+while isSmallerThenMaximumBackupSize(maximum_backup_size_percent, backups_folder_path):
+    print(f"Delete Iteration: {itteration_counter}")
+    if not check_time_left(start_time, time_limit):
+        raise TimeLimitExceededException()
+    
+    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.")

roles/sys-cln-bkps-service/handlers/main.yml

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+- name: "reload sys-cln-backups.cymais.service"
+  systemd:
+    name: sys-cln-backups.cymais.service
+    enabled: yes
+    daemon_reload: yes

roles/sys-cln-bkps-service/meta/main.yml

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+---
+galaxy_info:
+  author: "Kevin Veen-Birkenbach"
+  description: "Automates the cleanup of old backups by executing a Python script that deletes outdated backup versions when disk usage exceeds a specified threshold."
+  license: "CyMaIS NonCommercial License (CNCL)"
+  license_url: "https://s.veen.world/cncl"
+  company: |
+    Kevin Veen-Birkenbach
+    Consulting & Coaching Solutions
+    https://www.veen.world
+  min_ansible_version: "2.9"
+  platforms:
+    - name: Linux
+      versions:
+        - all
+  galaxy_tags:
+    - backup
+    - cleanup
+    - disk
+    - automation
+  repository: "https://s.veen.world/cymais"
+  issue_tracker_url: "https://s.veen.world/cymaisissues"
+  documentation: "https://s.veen.world/cymais"
+dependencies:  
+  - gen-python-pip
+  - sys-alm-compose
+  - sys-lock
+  - sys-rst-daemon

roles/sys-cln-bkps-service/tasks/main.yml

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+- name: install lsof and python-psutil
+  community.general.pacman:
+    name:
+      - lsof
+      - python-psutil
+    state: present
+  when: run_once_cleanup_backups_service is not defined
+
+- name: "create {{cleanup_backups_directory}}"
+  file:
+    path: "{{cleanup_backups_directory}}"
+    state: directory
+    mode: 0755
+  when: run_once_cleanup_backups_service is not defined
+
+- name: create sys-cln-backups.py
+  copy: 
+    src:  "sys-cln-backups.py"
+    dest: "{{cleanup_backups_directory}}sys-cln-backups.py"
+  when: run_once_cleanup_backups_service is not defined
+
+- name: create sys-cln-backups.cymais.service
+  template: 
+    src:  "sys-cln-backups.service.j2"
+    dest: "/etc/systemd/system/sys-cln-backups.cymais.service"
+  notify: reload sys-cln-backups.cymais.service
+  when: run_once_cleanup_backups_service is not defined
+
+- name: run the cleanup_backups_service tasks once
+  set_fact:
+    run_once_cleanup_backups_service: true
+  when: run_once_cleanup_backups_service is not defined

roles/sys-cln-bkps-service/templates/sys-cln-backups.service.j2

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+[Unit]
+Description=delete old backups
+OnFailure=sys-alm-compose.cymais@%n.service
+
+[Service]
+Type=oneshot
+ExecStartPre=/bin/sh -c '/usr/bin/python {{ path_system_lock_script }} {{ system_maintenance_services | join(' ')  }} --ignore {{system_maintenance_cleanup_services| join(' ') }} --timeout "{{system_maintenance_lock_timeout_backup_services}}"'
+ExecStart=/bin/sh -c '/usr/bin/python {{cleanup_backups_directory}}sys-cln-backups.py --backups-folder-path {{backups_folder_path}} --maximum-backup-size-percent {{size_percent_maximum_backup}}'

roles/sys-cln-bkps-service/vars/main.yml

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+cleanup_backups_directory: '{{path_administrator_scripts}}sys-cln-backups/'
+