systemd-veritysetup-generator - Unit generator for integrity protected
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 se 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
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 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).
systemd(1), systemd-veritysetup@.service(8), veritysetup(8), systemd-
systemd 237 SYSTEMD-VERITYSETUP-GENERATOR(8)
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