mirror of
https://github.com/systemd/systemd.git
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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
227 lines
10 KiB
XML
227 lines
10 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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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> is a unit
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generator that automatically discovers root,
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<filename>/home</filename>, <filename>/srv</filename> and swap
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partitions and creates mount and swap units for them, based on the
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partition type GUIDs of GUID partition tables (GPT),
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see <ulink url="http://www.uefi.org/specifications">UEFI Specification</ulink>, chapter 5.
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It implements the <ulink
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url="https://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/">Discoverable
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Partitions Specification</ulink>. Note that this generator has no
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effect on non-GPT systems, or where the directories under the
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mount points are already non-empty. Also, on systems where the
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units are explicitly configured (for example, listed in
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<citerefentry
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project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>),
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the units this generator creates are overridden, but additional
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implicit dependencies might be created.</para>
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<para>This generator will only look for root partitions on the
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same physical disk the EFI System Partition (ESP) is located on.
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It will only look for the other partitions on the same physical
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disk the root file system is located on. These partitions will not
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be searched for on systems where the root file system is distributed
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on multiple disks, for example via btrfs RAID.</para>
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<para><filename>systemd-gpt-auto-generator</filename> is useful
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for centralizing file system configuration in the partition table
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and making configuration in <filename>/etc/fstab</filename> unnecessary.
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</para>
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<para>This generator looks for the partitions based on their
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partition type GUID. The following partition type GUIDs are
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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-f297-41b2-9af7-d131d5f0458a</entry>
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<entry><filename>Root Partition (x86)</filename></entry>
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<entry>On 32-bit 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-4db1-96e7-fbcaf984b709</entry>
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<entry><filename>Root Partition (x86-64)</filename></entry>
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<entry>On 64-bit 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>69dad710-2ce4-4e3c-b16c-21a1d49abed3</entry>
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<entry><filename>Root Partition (32-bit ARM)</filename></entry>
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<entry>On 32-bit ARM systems, the first ARM 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>b921b045-1df0-41c3-af44-4c6f280d3fae</entry>
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<entry><filename>Root Partition (64-bit ARM)</filename></entry>
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<entry>On 64-bit ARM systems, the first ARM 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>993d8d3d-f80e-4225-855a-9daf8ed7ea97</entry>
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<entry><filename>Root Partition (Itanium/IA-64)</filename></entry>
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<entry>On Itanium systems, the first Itanium 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-b844-0e14e2aef915</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-907f-1a25a76f98e8</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-43c4-84e5-0933c84b4f4f</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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<row>
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<entry>c12a7328-f81f-11d2-ba4b-00a0c93ec93b</entry>
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<entry>EFI System Partition (ESP)</entry>
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<entry>The first ESP located on the disk the root partition is located on is mounted to <filename>/boot</filename> or <filename>/efi</filename>, see below.</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>This generator understands the following attribute flags for partitions:</para>
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<table>
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<title>Partition Attributes</title>
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<tgroup cols='4' align='left' colsep='1' rowsep='1'>
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<colspec colname="attribute" />
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<colspec colname="value" />
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<colspec colname="where" />
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<colspec colname="explanation" />
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Value</entry>
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<entry>Applicable to</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><constant>GPT_FLAG_READ_ONLY</constant></entry>
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<entry>0x1000000000000000</entry>
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<entry><filename>/</filename>, <filename>/srv</filename>, <filename>/home</filename></entry>
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<entry>Partition is mounted read-only</entry>
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</row>
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<row>
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<entry><constant>GPT_FLAG_NO_AUTO</constant></entry>
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<entry>0x8000000000000000</entry>
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<entry><filename>/</filename>, <filename>/srv</filename>, <filename>/home</filename></entry>
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<entry>Partition is not mounted automatically</entry>
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</row>
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<row>
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<entry><constant>GPT_FLAG_NO_BLOCK_IO_PROTOCOL</constant></entry>
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<entry>0x0000000000000002</entry>
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<entry>ESP</entry>
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<entry>Partition is not mounted automatically</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 <filename>/srv</filename>
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partitions may be encrypted in LUKS format. In this case, a device
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mapper device is 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 might create
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conflicts if the same partition is listed in
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<filename>/etc/crypttab</filename> with a different device mapper
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device name.</para>
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<para>Mount and automount units for the EFI System Partition (ESP) are generated on EFI systems. The ESP is mounted
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to <filename>/boot</filename>, unless a mount point directory <filename>/efi</filename> exists, in which case it is
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mounted there. Since this generator creates an automount unit, the mount will only be activated on-demand, when
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accessed. On systems where <filename>/boot</filename> (or <filename>/efi</filename> if it exists) is an explicitly
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configured mount (for example, listed in <citerefentry
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project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>) or where the
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<filename>/boot</filename> (or <filename>/efi</filename>) mount point is non-empty, no mount units are
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generated.</para>
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<para>When using this generator in conjunction with btrfs file
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systems, make sure to set the correct default subvolumes on them,
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using <command>btrfs subvolume set-default</command>.</para>
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<para><filename>systemd-gpt-auto-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>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-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><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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