utils: minor fix for ogReduceFs and ogExtendFs

Do not return the subprocess result for ogReduceFs/ogExtendFs.

ogReduceFs works with or without the target filesystem mounted.
ogExtendFs requires the target filesystem to be mounted.

'ogMount' legacy script invocation should be replaced by a better
mount/umount wrapper.

src/live/ogOperations.py

@@ -359,8 +359,7 @@ class OgLiveOperations:
             logging.info(f'partclone process exited with code {p1.returncode}')
             logging.info(f'lzop process exited with code {p2.returncode}')
 
-            if ogExtendFs(disk, partition) != 0:
-                logging.warn('Error extending filesystem after image creation')
+            ogExtendFs(disk, partition)
 
             image_info = ogGetImageInfo(image_path)
         except:

src/utils/fs.py

@@ -82,21 +82,21 @@ def ogReduceFs(disk, part):
     Bash function 'ogReduceFs' wrapper
     """
     proc = subprocess.run(f'ogReduceFs {disk} {part}',
-                          shell=True, stdout=PIPE)
-
-    if proc.returncode == 0:
-        subprocess.run(f'ogUnmount {disk} {part}',
-                       shell=True, stdout=PIPE)
-        return proc.stdout.decode().replace('\n', '')
-
-    logging.warn(f'ogReduceFS exited with code {proc.returncode}')
-    return None
+                          shell=True, stdout=PIPE,
+                          encoding='utf-8')
+    if proc.returncode != 0:
+        logging.warn(f'ogReduceFS exited with non zero code: {proc.returncode}')
+    subprocess.run(f'ogUnmount {disk} {part}',
+                   shell=True)
 
 
 def ogExtendFs(disk, part):
     """
     Bash function 'ogExtendFs' wrapper
     """
+    subprocess.run(f'ogMount {disk} {part}',
+                   shell=True)
     proc = subprocess.run(f'ogExtendFs {disk} {part}',
                           shell=True)
-    return proc.returncode
+    if proc.returncode != 0:
+        logging.warn(f'ogExtendFs exited with non zero code: {proc.returncode}')