focal (8) systemd-veritysetup-generator.8.gz

Provided by: systemd_245.4-4ubuntu3.24_amd64 bug

NAME
       systemd-veritysetup-generator - Unit generator for integrity protected block devices


SYNOPSIS
       /lib/systemd/system-generators/systemd-veritysetup-generator


DESCRIPTION
       systemd-veritysetup-generator is a generator that translates kernel command line options configuring
       integrity-protected block devices (verity) 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 a single verity device may be set up with this generator, backing the root file system of
       the OS.

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


KERNEL COMMAND LINE
       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.

       roothash=
           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 an integrity 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 integrity protection for the root file
           system. If not specified, these paths are automatically derived from the roothash= argument (see
           above).


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