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This adds a generator and a small service that will look for "roothash=" on the kernel command line and use it for setting up a very partition for the root device. This provides similar functionality to nspawn's existing --roothash= switch.
123 lines
5.4 KiB
XML
123 lines
5.4 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-veritysetup-generator" conditional='HAVE_LIBCRYPTSETUP'>
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<refentryinfo>
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<title>systemd-veritysetup-generator</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-veritysetup-generator</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-veritysetup-generator</refname>
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<refpurpose>Unit generator for integrity protected block devices</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/usr/lib/systemd/system-generators/systemd-veritysetup-generator</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-veritysetup-generator</filename> is a generator that translates kernel command line options
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configuring integrity protected block devices (verity) into native systemd units early at boot and when
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configuration of the system manager is reloaded. This will create
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<citerefentry><refentrytitle>systemd-veritysetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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units as necessary.</para>
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<para>Currently, only a single verity device may be se up with this generator, backing the root file system of the
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OS.</para>
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<para><filename>systemd-veritysetup-generator</filename> implements
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<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
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</refsect1>
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<refsect1>
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<title>Kernel Command Line</title>
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<para><filename>systemd-veritysetup-generator</filename>
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understands the following kernel command line parameters:</para>
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<variablelist class='kernel-commandline-options'>
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<varlistentry>
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<term><varname>systemd.verity=</varname></term>
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<term><varname>rd.systemd.verity=</varname></term>
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<listitem><para>Takes a boolean argument. Defaults to <literal>yes</literal>. If <literal>no</literal>,
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disables the generator entirely. <varname>rd.systemd.verity=</varname> is honored only by the initial RAM disk
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(initrd) while <varname>systemd.verity=</varname> is honored by both the host system and the
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initrd. </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>roothash=</varname></term>
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<listitem><para>Takes a root hash value for the root file system. Expects a hash value formatted in hexadecimal
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characters, of the appropriate length (i.e. most likely 256 bit/64 characters, or longer). If not specified via
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<varname>systemd.verity_root_data=</varname> and <varname>systemd.verity_root_hash=</varname>, the hash and
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data devices to use are automatically derived from the specified hash value. Specifically, the data partition
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device is looked for under a GPT partition UUID derived from the first 128bit of the root hash, the hash
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partition device is looked for under a GPT partition UUID derived from the last 128bit of the root hash. Hence
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it is usually sufficient to specify the root hash to boot from an integrity protected root file system, as
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device paths are automatically determined from it — as long as the partition table is properly set up.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>systemd.verity_root_data=</varname></term>
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<term><varname>systemd.verity_root_hash=</varname></term>
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<listitem><para>These two settings take block device paths as arguments, and may be use to explicitly configure
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the data partition and hash partition to use for setting up the integrity protection for the root file
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system. If not specified, these paths are automatically derived from the <varname>roothash=</varname> argument
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(see above).</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-veritysetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>veritysetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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