Rename btrfs subvolumes

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/persist/impermanence.sh

@@ -9,17 +9,17 @@ delete_subvolume_recursively() {
 mkdir -p /mnt/btrfs
 mount /dev/mapper/luks /mnt/btrfs
 
-if [[ -e /mnt/btrfs/root ]]; then
-  mkdir -p /mnt/btrfs/root.bak
-  timestamp=$(date --date="@$(stat -c %Y /mnt/btrfs/root)" "+%Y-%m-%-d_%H:%M:%S")
-  mv /mnt/btrfs/root "/mnt/btrfs/root.bak/$timestamp"
+if [[ -e /mnt/btrfs/@ ]]; then
+  mkdir -p /mnt/btrfs/@.bak
+  timestamp=$(date --date="@$(stat -c %Y /mnt/btrfs/@)" "+%Y-%m-%-d_%H:%M:%S")
+  mv /mnt/btrfs/@ "/mnt/btrfs/@.bak/$timestamp"
 fi
 
-find /mnt/btrfs/root.bak/ -maxdepth 1 -mtime +14 | while IFS= read -r i; do
+find /mnt/btrfs/@.bak/ -maxdepth 1 -mtime +14 | while IFS= read -r i; do
   delete_subvolume_recursively "$i"
 done
 
-btrfs subvolume create /mnt/btrfs/root
+btrfs subvolume create /mnt/btrfs/@
 
 umount /mnt/btrfs
 rmdir /mnt/btrfs