Provided by: systemd_251.4-1ubuntu7_amd64 bug


       systemd-veritysetup-generator - Unit generator for verity protected block devices




       systemd-veritysetup-generator is a generator that translates kernel command line options
       configuring verity protected block devices into native systemd units early at boot and
       when configuration of the system manager is reloaded. This will create systemd-
       veritysetup@.service(8) units as necessary.

       Currently, only two verity devices may be set up with this generator, backing the root and
       /usr file systems of the OS.

       systemd-veritysetup-generator implements systemd.generator(7).


       systemd-veritysetup-generator understands the following kernel command line parameters:

       systemd.verity=, rd.systemd.verity=
           Takes a boolean argument. Defaults to "yes". If "no", disables the generator entirely.
           rd.systemd.verity= is honored only by the initial RAM disk (initrd) while
           systemd.verity= is honored by both the host system and the initrd.

           Takes a root hash value for the root file system. Expects a hash value formatted in
           hexadecimal characters of the appropriate length (i.e. most likely 256 bit/64
           characters, or longer). If not specified via systemd.verity_root_data= and
           systemd.verity_root_hash=, the hash and data devices to use are automatically derived
           from the specified hash value. Specifically, the data partition device is looked for
           under a GPT partition UUID derived from the first 128bit of the root hash, the hash
           partition device is looked for under a GPT partition UUID derived from the last 128bit
           of the root hash. Hence it is usually sufficient to specify the root hash to boot from
           a verity protected root file system, as device paths are automatically determined from
           it — as long as the partition table is properly set up.

       systemd.verity_root_data=, systemd.verity_root_hash=
           These two settings take block device paths as arguments and may be used to explicitly
           configure the data partition and hash partition to use for setting up the verity
           protection for the root file system. If not specified, these paths are automatically
           derived from the roothash= argument (see above).

           Takes a comma-separated list of dm-verity options. Expects the following options
           ignore-corruption, restart-on-corruption, ignore-zero-blocks, check-at-most-once,
           panic-on-corruption and root-hash-signature=PATH|base64:HEX. See veritysetup(8) for
           more details.

       usrhash=, systemd.verity_usr_data=, systemd.verity_usr_hash=, systemd.verity_usr_options=
           Equivalent to their counterparts for the root file system as described above, but
           apply to the /usr/ file system instead.


       systemd(1), systemd-veritysetup@.service(8), veritysetup(8), systemd-fstab-generator(8)