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Explain why we use recursive deletion

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ItsDrike 2024-04-08 01:44:48 +02:00
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12
system/impermanence/autowipe.nix
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@ -34,6 +34,18 @@ in
umount /mnt umount /mnt
''; '';
in '' in ''
# Simply deleting a subvolume with btrfs subvolume delete will not work,
# if that subvolume contains other btrfs subvolumes. Because of that, we
# instead use this function to delete subvolumes, whihc will first perform
# a recursive deletion of any nested subvolumes.
#
# This is necessary, because the root subvolume will actually usually contain
# other subvolumes, even if the user haven't created those explicitly. It seems
# that NixOS creates these automatically. Namely, I observed these in root subvol:
# - root/srv
# - root/var/lib/portables
# - root/var/lib/machines
# - root/var/tmp
delete_subvolume_recursively() { delete_subvolume_recursively() {
IFS=$'\n' IFS=$'\n'
for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do