Finished backup to swappable implementation

roles/independent_backups-cleanup-service/files/backups-cleanup.py

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+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():
+    print("%d %% of disk %s are used" % (psutil.disk_usage(args.backups_folder_path).percent,args.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
+
+for host_backup_directory_name in os.listdir(args.backups_folder_path):
+    host_backup_directory_path = os.path.join(args.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)
+        
+        print_used_disc_space()  
+        for version in versions:
+            version_path=os.path.join(versions_directory, version)
+            version_status_pulling_path=os.path.join(versions_directory, version, ".pulling")
+            print("Checking directory %s ..." % (version_path))
+            if version == versions[-1]:
+                print("Directory %s contains the last version of the backup. Skipped." % (version_path))
+                continue
+            
+            if is_directory_used_by_another_process(version_path):
+                print("Directory %s is used by another process. Skipped." % (version_path))
+                continue
+             
+            old_disc_usage_percent=psutil.disk_usage(args.backups_folder_path).percent
+            if old_disc_usage_percent > args.maximum_backup_size_percent:
+                print("Deleting %s to free space." % (version_path))
+                shutil.rmtree(version_path)
+                new_disc_usage_percent=psutil.disk_usage(args.backups_folder_path).percent
+                difference_percent=old_disc_usage_percent-new_disc_usage_percent
+                print("{:6.2f} %% of drive freed".format(difference_percent))
+                continue
+            
+            if os.path.exists(version_status_pulling_path):
+                print("Deleting %s due to unfinished pull." % (version_path))
+                shutil.rmtree(version_path)
+                continue
+            
+print_used_disc_space()            
+print("Cleaning up finished.")