-btrfs subvolume set-default \
- $(btrfs subvolume list . | grep "root_$DISTRO$" | awk '{print $2}') .
-chattr -Rf +C root
+# could set default like this, but no reason to.
+# btrfs subvolume set-default \
+# $(btrfs subvolume list . | grep "root_$DISTRO$" | awk '{print $2}') .
+chattr -Rf +C root_$DISTRO