live: don't use python open() when reading image

Specifies the image path in the lzop subprocess string.

It might be interesting to study efficient mechanisms to read large
binary files in python before using open() with default parameters for
buffered binary reading.

src/live/ogOperations.py

@@ -134,15 +134,13 @@ class OgLiveOperations:
         self._restore_image(image_path, devpath)
 
     def _restore_image(self, image_path, devpath):
-        cmd_lzop = shlex.split('lzop -dc -')
+        cmd_lzop = shlex.split(f'lzop -dc {image_path}')
         cmd_pc = shlex.split(f'partclone.restore -d0 -C -I -o {devpath}')
         cmd_mbuffer = shlex.split('mbuffer -q -m 40M') if shutil.which('mbuffer') else None
 
-        with open(image_path, 'rb') as imgfile, \
-             open('/tmp/command.log', 'wb', 0) as logfile:
+        with open('/tmp/command.log', 'wb', 0) as logfile:
             proc_lzop = subprocess.Popen(cmd_lzop,
-                                         stdout=subprocess.PIPE,
-                                         stdin=imgfile)
+                                         stdout=subprocess.PIPE)
             proc_pc = subprocess.Popen(cmd_pc,
                                        stdin=proc_lzop.stdout,
                                        stderr=logfile)