systemd-veritysetup-generator - Unit generator for integrity protected block
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
Currently, only a single verity device may be se up with this generator, backing
the root file system of the OS.
systemd-veritysetup-generator implements systemd.generator
systemd-veritysetup-generator understands the following kernel command line
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
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.
These two settings take block device paths as
arguments, and may be use 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).