Preparing to split up ./lib/disk.py

And added some sane(?) defaults, which I'll massage into code some how.

archinstall/lib/disk.py

@@ -7,6 +7,7 @@ from typing import Optional
 from .general import *
 from .hardware import has_uefi
 from .output import log
+from .disk2 import btrfs # TODO: rename disk2 to disk, once we migrate all the code here into a structure
 
 ROOT_DIR_PATTERN = re.compile('^.*?/devices')
 GPT = 0b00000001
@@ -121,7 +122,7 @@ def disk_layout_filesystem_checks(layout):
 						options['btrfs-subvolumes'] = input('Would you like to use BTRFS subvolumes? (Y/n)').strip().lower() in ('', 'y', 'yes')
 
 					if options['btrfs-subvolumes']:
-						partition['filesystem']['subvolume'] = '@' # Detect /home etc, and set up sane defaults?
+						btrfs.create_subvolume(partition)
 
 def suggest_single_disk_layout(block_device, default_filesystem=None):
 	if not default_filesystem:

archinstall/lib/disk2/btrfs.py

@@ -0,0 +1,9 @@
+def create_subvolume(partition):
+	if partition['mountpoint'] == '/':
+		partition['filesystem']['subvolume'] = '@'
+	elif partition['mountpoint'] == '/home':
+		partition['filesystem']['subvolume'] = '@home'
+
+	# @.snapshots /.snapshots
+	# @log /var/log
+	# @pkg /var/cache/pacman/pkg