mirror of
https://github.com/systemd/systemd.git
synced 2024-10-30 06:25:37 +03:00
5c33b68652
Instead of having Minimize= take a boolean let's allow for two different ways to enable it. "best" means we want the most minimal image possible, which currently is only possible for read-only filesystems but can be extended in the future with bisection to find the most minimal possible size. We also add "guess", which is the current behavior, where we populate once and use the sparse size to make a reasonable guess on a size that fits all the sources without needing to O(log(n)) tries to find the most minimal size.
792 lines
42 KiB
XML
792 lines
42 KiB
XML
<?xml version='1.0'?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="repart.d" conditional='ENABLE_REPART'
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>repart.d</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>repart.d</refentrytitle>
|
|
<manvolnum>5</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>repart.d</refname>
|
|
<refpurpose>Partition Definition Files for Automatic Boot-Time Repartitioning</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><literallayout><filename>/etc/repart.d/*.conf</filename>
|
|
<filename>/run/repart.d/*.conf</filename>
|
|
<filename>/usr/lib/repart.d/*.conf</filename>
|
|
</literallayout></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><filename>repart.d/*.conf</filename> files describe basic properties of partitions of block
|
|
devices of the local system. They may be used to declare types, names and sizes of partitions that shall
|
|
exist. The
|
|
<citerefentry><refentrytitle>systemd-repart</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
service reads these files and attempts to add new partitions currently missing and enlarge existing
|
|
partitions according to these definitions. Operation is generally incremental, i.e. when applied, what
|
|
exists already is left intact, and partitions are never shrunk, moved or deleted.</para>
|
|
|
|
<para>These definition files are useful for implementing operating system images that are prepared and
|
|
delivered with minimally sized images (for example lacking any state or swap partitions), and which on
|
|
first boot automatically take possession of any remaining disk space following a few basic rules.</para>
|
|
|
|
<para>Currently, support for partition definition files is only implemented for GPT partitition
|
|
tables.</para>
|
|
|
|
<para>Partition files are generally matched against any partitions already existing on disk in a simple
|
|
algorithm: the partition files are sorted by their filename (ignoring the directory prefix), and then
|
|
compared in order against existing partitions matching the same partition type UUID. Specifically, the
|
|
first existing partition with a specific partition type UUID is assigned the first definition file with
|
|
the same partition type UUID, and the second existing partition with a specific type UUID the second
|
|
partition file with the same type UUID, and so on. Any left-over partition files that have no matching
|
|
existing partition are assumed to define new partition that shall be created. Such partitions are
|
|
appended to the end of the partition table, in the order defined by their names utilizing the first
|
|
partition slot greater than the highest slot number currently in use. Any existing partitions that have
|
|
no matching partition file are left as they are.</para>
|
|
|
|
<para>Note that these definitions may only be used to create and initialize new partitions or to grow
|
|
existing ones. In the latter case it will not grow the contained files systems however; separate
|
|
mechanisms, such as
|
|
<citerefentry><refentrytitle>systemd-growfs</refentrytitle><manvolnum>8</manvolnum></citerefentry> may be
|
|
used to grow the file systems inside of these partitions. Partitions may also be marked for automatic
|
|
growing via the <varname>GrowFileSystem=</varname> setting, in which case the file system is grown on
|
|
first mount by tools that respect this flag. See below for details.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>[Partition] Section Options</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><varname>Type=</varname></term>
|
|
|
|
<listitem><para>The GPT partition type UUID to match. This may be a GPT partition type UUID such as
|
|
<constant>4f68bce3-e8cd-4db1-96e7-fbcaf984b709</constant>, or an identifier.
|
|
Architecture specific partition types can use one of these architecture identifiers:
|
|
<constant>alpha</constant>, <constant>arc</constant>, <constant>arm</constant> (32bit),
|
|
<constant>arm64</constant> (64bit, aka aarch64), <constant>ia64</constant>,
|
|
<constant>loongarch64</constant>, <constant>mips-le</constant>, <constant>mips64-le</constant>,
|
|
<constant>parisc</constant>, <constant>ppc</constant>, <constant>ppc64</constant>,
|
|
<constant>ppc64-le</constant>, <constant>riscv32</constant>, <constant>riscv64</constant>,
|
|
<constant>s390</constant>, <constant>s390x</constant>, <constant>tilegx</constant>,
|
|
<constant>x86</constant> (32bit, aka i386) and <constant>x86-64</constant> (64bit, aka amd64).
|
|
|
|
The supported identifiers are:</para>
|
|
|
|
<table>
|
|
<title>GPT partition type identifiers</title>
|
|
|
|
<tgroup cols='2' align='left' colsep='1' rowsep='1'>
|
|
<colspec colname="name" />
|
|
<colspec colname="explanation" />
|
|
|
|
<thead>
|
|
<row>
|
|
<entry>Identifier</entry>
|
|
<entry>Explanation</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry><constant>esp</constant></entry>
|
|
<entry>EFI System Partition</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>xbootldr</constant></entry>
|
|
<entry>Extended Boot Loader Partition</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>swap</constant></entry>
|
|
<entry>Swap partition</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>home</constant></entry>
|
|
<entry>Home (<filename>/home/</filename>) partition</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>srv</constant></entry>
|
|
<entry>Server data (<filename>/srv/</filename>) partition</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>var</constant></entry>
|
|
<entry>Variable data (<filename>/var/</filename>) partition</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>tmp</constant></entry>
|
|
<entry>Temporary data (<filename>/var/tmp/</filename>) partition</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>linux-generic</constant></entry>
|
|
<entry>Generic Linux file system partition</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root</constant></entry>
|
|
<entry>Root file system partition type appropriate for the local architecture (an alias for an architecture root file system partition type listed below, e.g. <constant>root-x86-64</constant>)</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root-verity</constant></entry>
|
|
<entry>Verity data for the root file system partition for the local architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root-verity-sig</constant></entry>
|
|
<entry>Verity signature data for the root file system partition for the local architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root-secondary</constant></entry>
|
|
<entry>Root file system partition of the secondary architecture of the local architecture (usually the matching 32bit architecture for the local 64bit architecture)</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root-secondary-verity</constant></entry>
|
|
<entry>Verity data for the root file system partition of the secondary architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root-secondary-verity-sig</constant></entry>
|
|
<entry>Verity signature data for the root file system partition of the secondary architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root-{arch}</constant></entry>
|
|
<entry>Root file system partition of the given architecture (such as <constant>root-x86-64</constant> or <constant>root-riscv64</constant>)</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root-{arch}-verity</constant></entry>
|
|
<entry>Verity data for the root file system partition of the given architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>root-{arch}-verity-sig</constant></entry>
|
|
<entry>Verity signature data for the root file system partition of the given architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr</constant></entry>
|
|
<entry><filename>/usr/</filename> file system partition type appropriate for the local architecture (an alias for an architecture <filename>/usr/</filename> file system partition type listed below, e.g. <constant>usr-x86-64</constant>)</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr-verity</constant></entry>
|
|
<entry>Verity data for the <filename>/usr/</filename> file system partition for the local architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr-verity-sig</constant></entry>
|
|
<entry>Verity signature data for the <filename>/usr/</filename> file system partition for the local architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr-secondary</constant></entry>
|
|
<entry><filename>/usr/</filename> file system partition of the secondary architecture of the local architecture (usually the matching 32bit architecture for the local 64bit architecture)</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr-secondary-verity</constant></entry>
|
|
<entry>Verity data for the <filename>/usr/</filename> file system partition of the secondary architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr-secondary-verity-sig</constant></entry>
|
|
<entry>Verity signature data for the <filename>/usr/</filename> file system partition of the secondary architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr-{arch}</constant></entry>
|
|
<entry><filename>/usr/</filename> file system partition of the given architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr-{arch}-verity</constant></entry>
|
|
<entry>Verity data for the <filename>/usr/</filename> file system partition of the given architecture</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><constant>usr-{arch}-verity-sig</constant></entry>
|
|
<entry>Verity signature data for the <filename>/usr/</filename> file system partition of the given architecture</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>This setting defaults to <constant>linux-generic</constant>.</para>
|
|
|
|
<para>Most of the partition type UUIDs listed above are defined in the <ulink
|
|
url="https://uapi-group.org/specifications/specs/discoverable_partitions_specification">Discoverable Partitions
|
|
Specification</ulink>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Label=</varname></term>
|
|
|
|
<listitem><para>The textual label to assign to the partition if none is assigned yet. Note that this
|
|
setting is not used for matching. It is also not used when a label is already set for an existing
|
|
partition. It is thus only used when a partition is newly created or when an existing one had a no
|
|
label set (that is: an empty label). If not specified a label derived from the partition type is
|
|
automatically used. Simple specifier expansion is supported, see below.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>UUID=</varname></term>
|
|
|
|
<listitem><para>The UUID to assign to the partition if none is assigned yet. Note that this
|
|
setting is not used for matching. It is also not used when a UUID is already set for an existing
|
|
partition. It is thus only used when a partition is newly created or when an existing one had a
|
|
all-zero UUID set. If set to <literal>null</literal>, the UUID is set to all zeroes. If not specified
|
|
a UUID derived from the partition type is automatically used.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Priority=</varname></term>
|
|
|
|
<listitem><para>A numeric priority to assign to this partition, in the range -2147483648…2147483647,
|
|
with smaller values indicating higher priority, and higher values indicating smaller priority. This
|
|
priority is used in case the configured size constraints on the defined partitions do not permit
|
|
fitting all partitions onto the available disk space. If the partitions do not fit, the highest
|
|
numeric partition priority of all defined partitions is determined, and all defined partitions with
|
|
this priority are removed from the list of new partitions to create (which may be multiple, if the
|
|
same priority is used for multiple partitions). The fitting algorithm is then tried again. If the
|
|
partitions still do not fit, the now highest numeric partition priority is determined, and the
|
|
matching partitions removed too, and so on. Partitions of a priority of 0 or lower are never
|
|
removed. If all partitions with a priority above 0 are removed and the partitions still do not fit on
|
|
the device the operation fails. Note that this priority has no effect on ordering partitions, for
|
|
that use the alphabetical order of the filenames of the partition definition files. Defaults to
|
|
0.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Weight=</varname></term>
|
|
|
|
<listitem><para>A numeric weight to assign to this partition in the range 0…1000000. Available disk
|
|
space is assigned the defined partitions according to their relative weights (subject to the size
|
|
constraints configured with <varname>SizeMinBytes=</varname>, <varname>SizeMaxBytes=</varname>), so
|
|
that a partition with weight 2000 gets double the space as one with weight 1000, and a partition with
|
|
weight 333 a third of that. Defaults to 1000.</para>
|
|
|
|
<para>The <varname>Weight=</varname> setting is used to distribute available disk space in an
|
|
"elastic" fashion, based on the disk size and existing partitions. If a partition shall have a fixed
|
|
size use both <varname>SizeMinBytes=</varname> and <varname>SizeMaxBytes=</varname> with the same
|
|
value in order to fixate the size to one value, in which case the weight has no
|
|
effect.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>PaddingWeight=</varname></term>
|
|
|
|
<listitem><para>Similar to <varname>Weight=</varname>, but sets a weight for the free space after the
|
|
partition (the "padding"). When distributing available space the weights of all partitions and all
|
|
defined padding is summed, and then each partition and padding gets the fraction defined by its
|
|
weight. Defaults to 0, i.e. by default no padding is applied.</para>
|
|
|
|
<para>Padding is useful if empty space shall be left for later additions or a safety margin at the
|
|
end of the device or between partitions.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SizeMinBytes=</varname></term>
|
|
<term><varname>SizeMaxBytes=</varname></term>
|
|
|
|
<listitem><para>Specifies minimum and maximum size constraints in bytes. Takes the usual K, M, G, T,
|
|
… suffixes (to the base of 1024). If <varname>SizeMinBytes=</varname> is specified the partition is
|
|
created at or grown to at least the specified size. If <varname>SizeMaxBytes=</varname> is specified
|
|
the partition is created at or grown to at most the specified size. The precise size is determined
|
|
through the weight value configured with <varname>Weight=</varname>, see above. When
|
|
<varname>SizeMinBytes=</varname> is set equal to <varname>SizeMaxBytes=</varname> the configured
|
|
weight has no effect as the partition is explicitly sized to the specified fixed value. Note that
|
|
partitions are never created smaller than 4096 bytes, and since partitions are never shrunk the
|
|
previous size of the partition (in case the partition already exists) is also enforced as lower bound
|
|
for the new size. The values should be specified as multiples of 4096 bytes, and are rounded upwards
|
|
(in case of <varname>SizeMinBytes=</varname>) or downwards (in case of
|
|
<varname>SizeMaxBytes=</varname>) otherwise. If the backing device does not provide enough space to
|
|
fulfill the constraints placing the partition will fail. For partitions that shall be created,
|
|
depending on the setting of <varname>Priority=</varname> (see above) the partition might be dropped
|
|
and the placing algorithm restarted. By default a minimum size constraint of 10M and no maximum size
|
|
constraint is set.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>PaddingMinBytes=</varname></term>
|
|
<term><varname>PaddingMaxBytes=</varname></term>
|
|
|
|
<listitem><para>Specifies minimum and maximum size constraints in bytes for the free space after the
|
|
partition (the "padding"). Semantics are similar to <varname>SizeMinBytes=</varname> and
|
|
<varname>SizeMaxBytes=</varname>, except that unlike partition sizes free space can be shrunk and can
|
|
be as small as zero. By default no size constraints on padding are set, so that only
|
|
<varname>PaddingWeight=</varname> determines the size of the padding applied.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>CopyBlocks=</varname></term>
|
|
|
|
<listitem><para>Takes a path to a regular file, block device node or directory, or the special value
|
|
<literal>auto</literal>. If specified and the partition is newly created, the data from the specified
|
|
path is written to the newly created partition, on the block level. If a directory is specified, the
|
|
backing block device of the file system the directory is on is determined, and the data read directly
|
|
from that. This option is useful to efficiently replicate existing file systems onto new partitions
|
|
on the block level — for example to build a simple OS installer or an OS image builder.</para>
|
|
|
|
<para>If the special value <literal>auto</literal> is specified, the source to copy from is
|
|
automatically picked up from the running system (or the image specified with
|
|
<option>--image=</option> — if used). A partition that matches both the configured partition type (as
|
|
declared with <varname>Type=</varname> described above), and the currently mounted directory
|
|
appropriate for that partition type is determined. For example, if the partition type is set to
|
|
<literal>root</literal> the partition backing the root directory (<filename>/</filename>) is used as
|
|
source to copy from — if its partition type is set to <literal>root</literal> as well. If the
|
|
declared type is <literal>usr</literal> the partition backing <filename>/usr/</filename> is used as
|
|
source to copy blocks from — if its partition type is set to <literal>usr</literal> too. The logic is
|
|
capable of automatically tracking down the backing partitions for encrypted and Verity-enabled
|
|
volumes. <literal>CopyBlocks=auto</literal> is useful for implementing "self-replicating" systems,
|
|
i.e. systems that are their own installer.</para>
|
|
|
|
<para>The file specified here must have a size that is a multiple of the basic block size 512 and not
|
|
be empty. If this option is used, the size allocation algorithm is slightly altered: the partition is
|
|
created as least as big as required to fit the data in, i.e. the data size is an additional minimum
|
|
size value taken into consideration for the allocation algorithm, similar to and in addition to the
|
|
<varname>SizeMin=</varname> value configured above.</para>
|
|
|
|
<para>This option has no effect if the partition it is declared for already exists, i.e. existing
|
|
data is never overwritten. Note that the data is copied in before the partition table is updated,
|
|
i.e. before the partition actually is persistently created. This provides robustness: it is
|
|
guaranteed that the partition either doesn't exist or exists fully populated; it is not possible that
|
|
the partition exists but is not or only partially populated.</para>
|
|
|
|
<para>This option cannot be combined with <varname>Format=</varname> or
|
|
<varname>CopyFiles=</varname>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Format=</varname></term>
|
|
|
|
<listitem><para>Takes a file system name, such as <literal>ext4</literal>, <literal>btrfs</literal>,
|
|
<literal>xfs</literal>, <literal>vfat</literal>, <literal>erofs</literal>,
|
|
<literal>squashfs</literal> or the special value <literal>swap</literal>. If specified and the partition
|
|
is newly created it is formatted with the specified file system (or as swap device). The file system
|
|
UUID and label are automatically derived from the partition UUID and label. If this option is used,
|
|
the size allocation algorithm is slightly altered: the partition is created as least as big as
|
|
required for the minimal file system of the specified type (or 4KiB if the minimal size is not
|
|
known).</para>
|
|
|
|
<para>This option has no effect if the partition already exists.</para>
|
|
|
|
<para>Similarly to the behaviour of <varname>CopyBlocks=</varname>, the file system is formatted
|
|
before the partition is created, ensuring that the partition only ever exists with a fully
|
|
initialized file system.</para>
|
|
|
|
<para>This option cannot be combined with <varname>CopyBlocks=</varname>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>CopyFiles=</varname></term>
|
|
|
|
<listitem><para>Takes a pair of colon separated absolute file system paths. The first path refers to
|
|
a source file or directory on the host, the second path refers to a target in the file system of the
|
|
newly created partition and formatted file system. This setting may be used to copy files or
|
|
directories from the host into the file system that is created due to the <varname>Format=</varname>
|
|
option. If <varname>CopyFiles=</varname> is used without <varname>Format=</varname> specified
|
|
explicitly, <literal>Format=</literal> with a suitable default is implied (currently
|
|
<literal>ext4</literal>, but this may change in the future). This option may be used multiple times
|
|
to copy multiple files or directories from host into the newly formatted file system. The colon and
|
|
second path may be omitted in which case the source path is also used as the target path (relative to
|
|
the root of the newly created file system). If the source path refers to a directory it is copied
|
|
recursively.</para>
|
|
|
|
<para>This option has no effect if the partition already exists: it cannot be used to copy additional
|
|
files into an existing partition, it may only be used to populate a file system created anew.</para>
|
|
|
|
<para>The copy operation is executed before the file system is registered in the partition table,
|
|
thus ensuring that a file system populated this way only ever exists fully initialized.</para>
|
|
|
|
<para>Note that <varname>CopyFiles=</varname> will skip copying files that aren't supported by the
|
|
target filesystem (e.g symlinks, fifos, sockets and devices on vfat). When an unsupported file type
|
|
is encountered, repart will skip copying this file and write a log message about it.</para>
|
|
|
|
<para>This option cannot be combined with <varname>CopyBlocks=</varname>.</para>
|
|
|
|
<para>When <command>systemd-repart</command> is invoked with the <option>--image=</option> or
|
|
<option>--root=</option> command line switches the source paths specified are taken relative to the
|
|
specified root directory or disk image root.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>MakeDirectories=</varname></term>
|
|
|
|
<listitem><para>Takes one or more absolute paths, separated by whitespace, each declaring a directory
|
|
to create within the new file system. Behaviour is similar to <varname>CopyFiles=</varname>, but
|
|
instead of copying in a set of files this just creates the specified directories with the default
|
|
mode of 0755 owned by the root user and group, plus all their parent directories (with the same
|
|
ownership and access mode). To configure directories with different ownership or access mode, use
|
|
<varname>CopyFiles=</varname> and specify a source tree to copy containing appropriately
|
|
owned/configured directories. This option may be used more than once to create multiple
|
|
directories. When <varname>CopyFiles=</varname> and <varname>MakeDirectories=</varname> are used
|
|
together the former is applied first. If a directory listed already exists no operation is executed
|
|
(in particular, the ownership/access mode of the directories is left as is).</para>
|
|
|
|
<para>The primary usecase for this option is to create a minimal set of directories that may be
|
|
mounted over by other partitions contained in the same disk image. For example, a disk image where
|
|
the root file system is formatted at first boot might want to automatically pre-create
|
|
<filename>/usr/</filename> in it this way, so that the <literal>usr</literal> partition may
|
|
over-mount it.</para>
|
|
|
|
<para>Consider using
|
|
<citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
with its <option>--image=</option> option to pre-create other, more complex directory hierarchies (as
|
|
well as other inodes) with fine-grained control of ownership, access modes and other file
|
|
attributes.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Encrypt=</varname></term>
|
|
|
|
<listitem><para>Takes one of <literal>off</literal>, <literal>key-file</literal>,
|
|
<literal>tpm2</literal> and <literal>key-file+tpm2</literal> (alternatively, also accepts a boolean
|
|
value, which is mapped to <literal>off</literal> when false, and <literal>key-file</literal> when
|
|
true). Defaults to <literal>off</literal>. If not <literal>off</literal> the partition will be
|
|
formatted with a LUKS2 superblock, before the blocks configured with <varname>CopyBlocks=</varname>
|
|
are copied in or the file system configured with <varname>Format=</varname> is created.</para>
|
|
|
|
<para>The LUKS2 UUID is automatically derived from the partition UUID in a stable fashion. If
|
|
<literal>key-file</literal> or <literal>key-file+tpm2</literal> is used, a key is added to the LUKS2
|
|
superblock, configurable with the <option>--key-file=</option> option to
|
|
<command>systemd-repart</command>. If <literal>tpm2</literal> or <literal>key-file+tpm2</literal> is
|
|
used, a key is added to the LUKS2 superblock that is enrolled to the local TPM2 chip, as configured
|
|
with the <option>--tpm2-device=</option> and <option>--tpm2-pcrs=</option> options to
|
|
<command>systemd-repart</command>.</para>
|
|
|
|
<para>When used this slightly alters the size allocation logic as the implicit, minimal size limits
|
|
of <varname>Format=</varname> and <varname>CopyBlocks=</varname> are increased by the space necessary
|
|
for the LUKS2 superblock (see above).</para>
|
|
|
|
<para>This option has no effect if the partition already exists.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Verity=</varname></term>
|
|
|
|
<listitem><para>Takes one of <literal>off</literal>, <literal>data</literal>,
|
|
<literal>hash</literal> or <literal>signature</literal>. Defaults to <literal>off</literal>. If set
|
|
to <literal>off</literal> or <literal>data</literal>, the partition is populated with content as
|
|
specified by <varname>CopyBlocks=</varname> or <varname>CopyFiles=</varname>. If set to
|
|
<literal>hash</literal>, the partition will be populated with verity hashes from the matching verity
|
|
data partition. If set to <literal>signature</literal>, The partition will be populated with a JSON
|
|
object containing a signature of the verity root hash of the matching verity hash partition.</para>
|
|
|
|
<para>A matching verity partition is a partition with the same verity match key (as configured with
|
|
<varname>VerityMatchKey=</varname>).</para>
|
|
|
|
<para>If not explicitly configured, the data partition's UUID will be set to the first 128
|
|
bits of the verity root hash. Similarly, if not configured, the hash partition's UUID will be set to
|
|
the final 128 bits of the verity root hash. The verity root hash itself will be included in the
|
|
output of <command>systemd-repart</command>.</para>
|
|
|
|
<para>This option has no effect if the partition already exists.</para>
|
|
|
|
<para>Usage of this option in combination with <varname>Encrypt=</varname> is not supported.</para>
|
|
|
|
<para>For each unique <varname>VerityMatchKey=</varname> value, a single verity data partition
|
|
(<literal>Verity=data</literal>) and a single verity hash partition (<literal>Verity=hash</literal>)
|
|
must be defined.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>VerityMatchKey=</varname></term>
|
|
|
|
<listitem><para>Takes a short, user-chosen identifier string. This setting is used to find sibling
|
|
verity partitions for the current verity partition. See the description for
|
|
<varname>Verity=</varname>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>FactoryReset=</varname></term>
|
|
|
|
<listitem><para>Takes a boolean argument. If specified the partition is marked for removal during a
|
|
factory reset operation. This functionality is useful to implement schemes where images can be reset
|
|
into their original state by removing partitions and creating them anew. Defaults to off.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Flags=</varname></term>
|
|
|
|
<listitem><para>Configures the 64bit GPT partition flags field to set for the partition when creating
|
|
it. This option has no effect if the partition already exists. If not specified the flags values is
|
|
set to all zeroes, except for the three bits that can also be configured via
|
|
<varname>NoAuto=</varname>, <varname>ReadOnly=</varname> and <varname>GrowFileSystem=</varname>; see
|
|
below for details on the defaults for these three flags. Specify the flags value in hexadecimal (by
|
|
prefixing it with <literal>0x</literal>), binary (prefix <literal>0b</literal>) or decimal (no
|
|
prefix).</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>NoAuto=</varname></term>
|
|
<term><varname>ReadOnly=</varname></term>
|
|
<term><varname>GrowFileSystem=</varname></term>
|
|
|
|
<listitem><para>Configures the No-Auto, Read-Only and Grow-File-System partition flags (bit 63, 60
|
|
and 59) of the partition table entry, as defined by the <ulink
|
|
url="https://uapi-group.org/specifications/specs/discoverable_partitions_specification">Discoverable Partitions Specification</ulink>. Only
|
|
available for partition types supported by the specification. This option is a friendly way to set
|
|
bits 63, 60 and 59 of the partition flags value without setting any of the other bits, and may be set
|
|
via <varname>Flags=</varname> too, see above.</para>
|
|
|
|
<para>If <varname>Flags=</varname> is used in conjunction with one or more of
|
|
<varname>NoAuto=</varname>/<varname>ReadOnly=</varname>/<varname>GrowFileSystem=</varname> the latter
|
|
control the value of the relevant flags, i.e. the high-level settings
|
|
<varname>NoAuto=</varname>/<varname>ReadOnly=</varname>/<varname>GrowFileSystem=</varname> override
|
|
the relevant bits of the low-level setting <varname>Flags=</varname>.</para>
|
|
|
|
<para>Note that the three flags affect only automatic partition mounting, as implemented by
|
|
<citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
or the <option>--image=</option> option of various commands (such as
|
|
<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>). It
|
|
has no effect on explicit mounts, such as those done via <citerefentry
|
|
project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry> or
|
|
<citerefentry
|
|
project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
|
|
|
|
<para>If both bit 50 and 59 are set for a partition (i.e. the partition is marked both read-only and
|
|
marked for file system growing) the latter is typically without effect: the read-only flag takes
|
|
precedence in most tools reading these flags, and since growing the file system involves writing to
|
|
the partition it is consequently ignored.</para>
|
|
|
|
<para><varname>NoAuto=</varname> defaults to off. <varname>ReadOnly=</varname> defaults to on for
|
|
Verity partition types, and off for all others. <varname>GrowFileSystem=</varname> defaults to on for
|
|
all partition types that support it, except if the partition is marked read-only (and thus
|
|
effectively, defaults to off for Verity partitions).</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SplitName=</varname></term>
|
|
|
|
<listitem><para>Configures the suffix to append to split artifacts when the <option>--split</option>
|
|
option of <command>systemd-repart</command> is used. Simple specifier expansion is supported, see
|
|
below. Defaults to <literal>%t</literal>. To disable split artifact generation for a partition, set
|
|
<varname>SplitName=</varname> to <literal>-</literal>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Minimize=</varname></term>
|
|
|
|
<listitem><para>Takes one of <literal>off</literal>, <literal>best</literal>, and
|
|
<literal>guess</literal> (alternatively, also accepts a boolean value, which is mapped to
|
|
<literal>off</literal> when false, and <literal>best</literal> when true). Defaults to
|
|
<literal>off</literal>. If set to <literal>best</literal>, the partition will have the minimal size
|
|
required to store the sources configured with <varname>CopyFiles=</varname>. <literal>best</literal>
|
|
is currently only supported for read-only filesystems. If set to <literal>guess</literal>, the
|
|
partition is created at least as big as required to store the sources configured with
|
|
<varname>CopyFiles=</varname>. Note that unless the filesystem is a read-only filesystem,
|
|
<command>systemd-repart</command> will have to populate the filesystem twice to guess the minimal
|
|
required size, so enabling this option might slow down repart when populating large partitions.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Specifiers</title>
|
|
|
|
<para>Specifiers may be used in the <varname>Label=</varname>, <varname>CopyBlocks=</varname>,
|
|
<varname>CopyFiles=</varname>, <varname>MakeDirectories=</varname>, <varname>SplitName=</varname>
|
|
settings. The following expansions are understood:</para>
|
|
<table class='specifiers'>
|
|
<title>Specifiers available</title>
|
|
<tgroup cols='3' align='left' colsep='1' rowsep='1'>
|
|
<colspec colname="spec" />
|
|
<colspec colname="mean" />
|
|
<colspec colname="detail" />
|
|
<thead>
|
|
<row>
|
|
<entry>Specifier</entry>
|
|
<entry>Meaning</entry>
|
|
<entry>Details</entry>
|
|
</row>
|
|
</thead>
|
|
<tbody>
|
|
<xi:include href="standard-specifiers.xml" xpointer="a"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="A"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="b"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="B"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="H"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="l"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="m"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="M"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="o"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="v"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="w"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="W"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="T"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="V"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="percent"/>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>Additionally, for the <varname>SplitName=</varname> setting, the following specifiers are also
|
|
understood:</para>
|
|
<table class='specifiers'>
|
|
<title>Specifiers available</title>
|
|
<tgroup cols='3' align='left' colsep='1' rowsep='1'>
|
|
<colspec colname="spec" />
|
|
<colspec colname="mean" />
|
|
<colspec colname="detail" />
|
|
<thead>
|
|
<row>
|
|
<entry>Specifier</entry>
|
|
<entry>Meaning</entry>
|
|
<entry>Details</entry>
|
|
</row>
|
|
</thead>
|
|
<tbody>
|
|
<row id='T'>
|
|
<entry><literal>%T</literal></entry>
|
|
<entry>Partition Type UUID</entry>
|
|
<entry>The partition type UUID, as configured with <varname>Type=</varname></entry>
|
|
</row>
|
|
<row id='t'>
|
|
<entry><literal>%t</literal></entry>
|
|
<entry>Partition Type Identifier</entry>
|
|
<entry>The partition type identifier corresponding to the partition type UUID</entry>
|
|
</row>
|
|
<row id='U'>
|
|
<entry><literal>%U</literal></entry>
|
|
<entry>Partition UUID</entry>
|
|
<entry>The partition UUID, as configured with <varname>UUID=</varname></entry>
|
|
</row>
|
|
<row id='n'>
|
|
<entry><literal>%n</literal></entry>
|
|
<entry>Partition Number</entry>
|
|
<entry>The partition number assigned to the partition</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Examples</title>
|
|
|
|
<example>
|
|
<title>Grow the root partition to the full disk size at first boot</title>
|
|
|
|
<para>With the following file the root partition is automatically grown to the full disk if possible during boot.</para>
|
|
|
|
<para><programlisting># /usr/lib/repart.d/50-root.conf
|
|
[Partition]
|
|
Type=root
|
|
</programlisting></para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Create a swap and home partition automatically on boot, if missing</title>
|
|
|
|
<para>The home partition gets all available disk space while the swap partition gets 1G at most and 64M
|
|
at least. We set a priority > 0 on the swap partition to ensure the swap partition is not used if not
|
|
enough space is available. For every three bytes assigned to the home partition the swap partition gets
|
|
assigned one.</para>
|
|
|
|
<para><programlisting># /usr/lib/repart.d/60-home.conf
|
|
[Partition]
|
|
Type=home
|
|
</programlisting></para>
|
|
|
|
<para><programlisting># /usr/lib/repart.d/70-swap.conf
|
|
[Partition]
|
|
Type=swap
|
|
SizeMinBytes=64M
|
|
SizeMaxBytes=1G
|
|
Priority=1
|
|
Weight=333
|
|
</programlisting></para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Create B partitions in an A/B Verity setup, if missing</title>
|
|
|
|
<para>Let's say the vendor intends to update OS images in an A/B setup, i.e. with two root partitions
|
|
(and two matching Verity partitions) that shall be used alternatingly during upgrades. To minimize
|
|
image sizes the original image is shipped only with one root and one Verity partition (the "A" set),
|
|
and the second root and Verity partitions (the "B" set) shall be created on first boot on the free
|
|
space on the medium.</para>
|
|
|
|
<para><programlisting># /usr/lib/repart.d/50-root.conf
|
|
[Partition]
|
|
Type=root
|
|
SizeMinBytes=512M
|
|
SizeMaxBytes=512M
|
|
</programlisting></para>
|
|
|
|
<para><programlisting># /usr/lib/repart.d/60-root-verity.conf
|
|
[Partition]
|
|
Type=root-verity
|
|
SizeMinBytes=64M
|
|
SizeMaxBytes=64M
|
|
</programlisting></para>
|
|
|
|
<para>The definitions above cover the "A" set of root partition (of a fixed 512M size) and Verity
|
|
partition for the root partition (of a fixed 64M size). Let's use symlinks to create the "B" set of
|
|
partitions, since after all they shall have the same properties and sizes as the "A" set.</para>
|
|
|
|
<para><programlisting># ln -s 50-root.conf /usr/lib/repart.d/70-root-b.conf
|
|
# ln -s 60-root-verity.conf /usr/lib/repart.d/80-root-verity-b.conf
|
|
</programlisting></para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Create a data and verity partition from a OS tree</title>
|
|
|
|
<para>Assuming we have an OS tree at /var/tmp/os-tree that we want to package in a root partition
|
|
together with a matching verity partition, we can do so as follows:</para>
|
|
|
|
<para><programlisting># 50-root.conf
|
|
[Partition]
|
|
Type=root
|
|
CopyFiles=/var/tmp/os-tree
|
|
Verity=data
|
|
VerityMatchKey=root
|
|
</programlisting></para>
|
|
|
|
<para><programlisting># 60-root-verity.conf
|
|
[Partition]
|
|
Type=root-verity
|
|
Verity=hash
|
|
VerityMatchKey=root
|
|
</programlisting></para>
|
|
</example>
|
|
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-repart</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>sfdisk</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-cryptenroll</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|