> That requires ext4 AFAIK, whereas many systems use XFS, BTRFS, or ZFS. All three of these support immutable files: * https://man.archlinux.org/man/xfs.5.en#

> That requires ext4 AFAIK, whereas many systems use XFS, BTRFS, or ZFS. All three of these support immutable files: * https://man.archlinux.org/man/xfs.5.en#FILE_ATTRIBUTES https://man.archlinux.org/man/xfs.5.en#FILE_ATTRIBUTES * https://man.archlinux.org/man/btrfs.5.en#Attributes https://man.archlinux.org/man/btrfs.5.en#Attributes * 2016 OpenZFS bug where it was broken and fixed: https://github.com/openzfs/zfs/pull/5486 https://github.com/openzfs/zfs/pull/5486