live: add image backup option in image creation

Backup image file if image creation request included

	"backup": true

This only applies when the target image is already present in the
repository folder before running the partclone subprocess.

This parameter is ignored if the target image is not present in the
repository.

src/live/ogOperations.py

@@ -6,6 +6,7 @@
 # Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
 
+import datetime
 import hashlib
 import logging
 import os
@@ -404,6 +405,7 @@ class OgLiveOperations:
         partition = int(request.getPartition())
         name = request.getName()
         repo = request.getRepo()
+        backup = request.getBackup()
         image_path = f'/opt/opengnsys/images/{name}.img'
 
         self._ogbrowser_clear_logs()
@@ -446,6 +448,10 @@ class OgLiveOperations:
 
             logfile = open('/tmp/command.log', 'wb', 0)
 
+            if os.path.exists(image_path) and backup:
+                    now = datetime.datetime.now().strftime("%Y_%m_%d_%H_%M_%S")
+                    shutil.move(image_path, f'{image_path}_{now}')
+
             p1 = Popen(cmd1, stdout=PIPE, stderr=logfile)
             p2 = Popen(cmd2, stdin=p1.stdout)
             p1.stdout.close()