fs: add swap support and improve mkfs logging

src/utils/fs.py

@@ -146,16 +146,17 @@ def mkfs(fs, disk, partition, label=None):
         'ext4': mkfs_ext4,
         'ntfs': mkfs_ntfs,
         'fat32': mkfs_fat32,
+        'linux-swap': mkfs_swap,
     }
 
     if fs not in fsdict:
-        logging.warn(f'mkfs aborted, invalid target filesystem.')
-        raise ValueError('Invalid target filesystem')
+        logging.error(f'mkfs fails, unsupported target filesystem {fs}')
+        raise ValueError(f'Unsupported target filesystem {fs}')
 
     try:
         partdev = get_partition_device(disk, partition)
     except ValueError as e:
-        logging.warn(f'mkfs aborted, invalid partition.')
+        logging.error(f'mkfs aborted, invalid partition.')
         raise e
 
     fsdict[fs](partdev, label)
@@ -194,6 +195,17 @@ def mkfs_fat32(partdev, label=None):
                        stderr=STDOUT)
 
 
+def mkfs_swap(partdev, label=None):
+    if label:
+        cmd = shlex.split(f'mkswap -f -L {label} {partdev}')
+    else:
+        cmd = shlex.split(f'mkswap -f {partdev}')
+    with open('/tmp/command.log', 'wb', 0) as logfile:
+        subprocess.run(cmd,
+                       stdout=logfile,
+                       stderr=STDOUT)
+
+
 def get_filesystem_type(partdev):
     """
     Get filesystem type from a partition device path.