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When run in an initrd and no root= argument is set (or is set to
root=gpt-auto) we will automatically look for the root partition on the
same disk the EFI ESP is located on.
Since we look for swap, /home and /srv on the disk the root partition is
located on, we hence have a fully discoverable chain:
Firmware discovers the EFI ESP partition → the initrd discovers the
root partition → the host OS discovers swap, /home, and /srv.
Note that this requires an EFI boot loader that sets the
LoaderDevicePartUUID EFI variable, such as Gummiboot.
175 lines
9.6 KiB
XML
175 lines
9.6 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 2013 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-gpt-auto-generator">
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<refentryinfo>
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<title>systemd-gpt-auto-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-gpt-auto-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-gpt-auto-generator</refname>
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<refpurpose>Generator for automatically discovering
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and mounting root, <filename>/home</filename> and
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<filename>/srv</filename> partitions, as well as
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discovering and enabling swap partitions, based on GPT
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partition type GUIDs.</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/usr/lib/systemd/system-generators/systemd-gpt-auto-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-gpt-auto-generator</filename>
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is a unit generator that automatically discovers root,
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<filename>/home</filename>, <filename>/srv</filename>
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and swap partitions and creates mount and swap units
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for them, based on the the partition type GUIDs of
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GUID partition tables (GPT). Note that this generator
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has no effect on non-GPT systems, on systems where the
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units are explicitly configured (for example, listed
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in
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<citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>),
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or where the mount points are non-empty.</para>
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<para>This generator will only look for root
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partitions on the same physical disk the EFI System
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Partition (ESP) is located on. It will only look for
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the other partitions on the same physical disk the
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root file system is located on. These partitions will
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not be search on systems where the root file system is
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distributed on multiple disks, for example via btrfs
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RAID.</para>
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<para><filename>systemd-gpt-auto-generator</filename>
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is useful for centralizing file system configuration
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in the partition table and making manual configuration
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in <filename>/etc/fstab</filename> or suchlike
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unnecessary.</para>
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<para>This generator looks for the partitions based on
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their partition type GUID. The following partition
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type GUIDs are identified:</para>
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<table>
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<title>Partition Type GUIDs</title>
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<tgroup cols='3' align='left' colsep='1' rowsep='1'>
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<colspec colname="guid" />
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<colspec colname="name" />
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<colspec colname="explanation" />
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<thead>
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<row>
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<entry>Partition Type GUID</entry>
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<entry>Name</entry>
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<entry>Explanation</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>44479540-f297-41b2-9af7d131d5f0458a</entry>
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<entry><filename>Root Partition (x86)</filename></entry>
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<entry>On 32bit x86 systems the first x86 root partition on the disk the EFI ESP is located on is mounted to the root directory <filename>/</filename>.</entry>
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</row>
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<row>
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<entry>4f68bce3-e8cd-4db1-96e7fbcaf984b709</entry>
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<entry><filename>Root Partition (x86-64)</filename></entry>
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<entry>On 64bit x86 systems the first x86-64 root partition on the disk the EFI ESP is located on is mounted to the root directory <filename>/</filename>.</entry>
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</row>
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<row>
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<entry>933ac7e1-2eb4-4f13-b8440e14e2aef915</entry>
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<entry>Home Partition</entry>
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<entry>The first home partition on the disk the root partition is located on is mounted to <filename>/home</filename>.</entry>
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</row>
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<row>
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<entry>3b8f8425-20e0-4f3b-907f1a25a76f98e8</entry>
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<entry>Server Data Partition</entry>
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<entry>The first server data partition on the disk the root partition is located on is mounted to <filename>/srv</filename>.</entry>
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</row>
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<row>
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<entry>0657fd6d-a4ab-43c4-84e50933c84b4f4f</entry>
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<entry>Swap</entry>
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<entry>All swap partitions located on the disk the root partition is located on are enabled.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>The <filename>/home</filename> and
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<filename>/srv</filename> partitions may be encrypted
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in LUKS format. In this case a device mapper device is
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set up under the names
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<filename>/dev/mapper/home</filename> and
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<filename>/dev/mapper/srv</filename>. Note that this
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might create conflicts if the same partition is listed
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in <filename>/etc/crypttab</filename> with a different
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device mapper device name.</para>
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<para>Also note that
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<citerefentry><refentrytitle>systemd-efi-boot-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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will mount the EFI System Partition (ESP) to
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<filename>/boot</filename> if not otherwise mounted.</para>
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<para>When using this generator in conjunction with
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btrfs file systems make sure to set the correct
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default subvolumes on them, using <command>btrfs
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subvolume set-default</command>.</para>
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<para><filename>systemd-gpt-auto-generator</filename>
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implements the <ulink
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url="http://www.freedesktop.org/wiki/Software/systemd/Generators">generator
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specification</ulink>.</para>
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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.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.swap</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-efi-boot-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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