Create readonly btrfs snapshots and restore them if required

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Mount btrfs volumes to disk:

sudo mount /dev/mapper/luks-<TAB> /mnt/btrfs

Make a read-only snapshot:

sudo btrfs subvolume snapshot -r /mnt/btrfs/system_fedora33 /mnt/btrfs/snapshots/system_fedora33/@snapshot_$(date '+%Y-%m-%d_%H-%M')

Rollback snapshot created:

  1. Boot into an alternative operating system

  2. Rename filesystem for safety: sudo mv /mnt/btrfs/system_fedora33 /mnt/btrfs/system_fedora33_bak

  3. Reinstate snapshot as a read+write filesystem: sudo btrfs subvolume snapshot /mnt/btrfs/snapshots/system_fedora33/@snapshot_2020-01-01_01-01 /mnt/btrfs/system_fedora33

  4. Delete the no longer required read-only snapshot: sudo btrfs subvolume delete /mnt/btrfs/snapshots/system_fedora33/@snapshot_2020-01-01_01-01

  5. Remove original filesystem once restore is proven to work: sudo btrfs subvolume delete /mnt/btrfs/system_fedora33_bak