systemd-veritysetup@.service, systemd-veritysetup — Disk verity protection logic
systemd-veritysetup@.service
/usr/lib/systemd/systemd-veritysetup
systemd-veritysetup@.service is a service responsible for setting up verity
    protection block devices. It should be instantiated for each device that requires verity
    protection.
At early boot and when the system manager configuration is reloaded kernel command line configuration for
    verity protected block devices is translated into systemd-veritysetup@.service units by
    systemd-veritysetup-generator(8).
systemd-veritysetup@.service calls systemd-veritysetup.
The following commands are understood by systemd-veritysetup:
attach
          volume
          datadevice
          hashdevice
          roothash
          [option...]
        ¶Create a block device volume using
        datadevice and hashdevice as the backing
        devices. roothash forms the root of the tree of hashes stored on
        hashdevice. See
        
          Kernel dm-verity documentation for details.
        
detach
          volume
        ¶Detach (destroy) the block device
        volume.
help
        ¶Print short information about command syntax.