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diff --git a/man/systemd-sysupdate.xml b/man/systemd-sysupdate.xml new file mode 100644 index 0000000..77c1635 --- /dev/null +++ b/man/systemd-sysupdate.xml @@ -0,0 +1,287 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!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="systemd-sysupdate" conditional='ENABLE_SYSUPDATE' + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>systemd-sysupdate</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd-sysupdate</refentrytitle> + <manvolnum>8</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd-sysupdate</refname> + <refname>systemd-sysupdate.service</refname> + <refname>systemd-sysupdate.timer</refname> + <refname>systemd-sysupdate-reboot.service</refname> + <refname>systemd-sysupdate-reboot.timer</refname> + <refpurpose>Automatically Update OS or Other Resources</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis> + <command>systemd-sysupdate</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + </cmdsynopsis> + + <para><filename>systemd-sysupdate.service</filename></para> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><command>systemd-sysupdate</command> atomically updates the host OS, container images, portable + service images or other sources, based on the transfer configuration files described in + <citerefentry><refentrytitle>sysupdate.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <para>This tool implements file, directory, or partition based update schemes, supporting multiple + parallel installed versions of specific resources in an A/B (or even: A/B/C, A/B/C/D/, …) style. A/B + updating means that when one version of a resource is currently being used, the next version can be + downloaded, unpacked, and prepared in an entirely separate location, independently of the first, and — once + complete — be activated, swapping the roles so that it becomes the used one and the previously used one + becomes the one that is replaced by the next update, and so on. The resources to update are defined + in transfer files, one for each resource to be updated. For example, resources that may be updated with + this tool could be: a root file system partition, a matching Verity partition plus one kernel image. The + combination of the three would be considered a complete OS update.</para> + + <para>The tool updates partitions, files or directory trees always in whole, and operates with at least + two versions of each of these resources: the <emphasis>current</emphasis> version, plus the + <emphasis>next</emphasis> version: the one that is being updated to, and which is initially incomplete as + the downloaded data is written to it; plus optionally more versions. Once the download of a newer version + is complete it becomes the current version, releasing the version previously considered current for + deletion/replacement/updating.</para> + + <para>When installing new versions the tool will directly download, decompress, unpack and write the new + version into the destination. This is done in a robust fashion so that an incomplete download can be + recognized on next invocation, and flushed out before a new attempt is initiated.</para> + + <para>Note that when writing updates to a partition, the partition has to exist already, as + <command>systemd-sysupdate</command> will not automatically create new partitions. Use a tool such as + <citerefentry><refentrytitle>systemd-repart</refentrytitle><manvolnum>8</manvolnum></citerefentry> to + automatically create additional partitions to be used with <command>systemd-sysupdate</command> on + boot.</para> + + <para>The tool can both be used on the running OS, to update the OS in "online" state from within itself, + and on "offline" disk images, to update them from the outside based on transfer files + embedded in the disk images. For the latter, see <option>--image=</option> below. The latter is + particularly interesting to update container images or portable service images.</para> + + <para>The <filename>systemd-sysupdate.service</filename> system service will automatically update the + host OS based on the installed transfer files. It is triggered in regular intervals via + <filename>systemd-sysupdate.timer</filename>. The <filename>systemd-sysupdate-reboot.service</filename> + will automatically reboot the system after a new version is installed. It is triggered via + <filename>systemd-sysupdate-reboot.timer</filename>. The two services are separate from each other as it + is typically advisable to download updates regularly while the system is up, but delay reboots until the + appropriate time (i.e. typically at night). The two sets of service/timer units may be enabled + separately.</para> + + <para>For details about transfer files and examples see + <citerefentry><refentrytitle>sysupdate.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + </refsect1> + + <refsect1> + <title>Command</title> + + <para>The following commands are understood:</para> + + <variablelist> + <varlistentry> + <term><option>list</option> <optional><replaceable>VERSION</replaceable></optional></term> + + <listitem><para>If invoked without an argument, enumerates downloadable and installed versions, and + shows a summarizing table with the discovered versions and their properties, including whether + there's a newer candidate version to update to. If a version argument is specified, shows details + about the specific version, including the individual files that need to be transferred to acquire the + version.</para> + + <para>If no command is explicitly specified this command is implied.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>check-new</option></term> + + <listitem><para>Checks if there's a new version available. This internally enumerates downloadable and + installed versions and returns exit status 0 if there's a new version to update to, non-zero + otherwise. If there is a new version to update to, its version identifier is written to standard + output.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>update</option> <optional><replaceable>VERSION</replaceable></optional></term> + + <listitem><para>Installs (updates to) the specified version, or if none is specified to the newest + version available. If the version is already installed or no newer version available, no operation is + executed.</para> + + <para>If a new version to install/update to is found, old installed versions are deleted until at + least one new version can be installed, as configured via <varname>InstanceMax=</varname> in + <citerefentry><refentrytitle>sysupdate.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, or + via the available partition slots of the right type. This implicit operation can also be invoked + explicitly via the <command>vacuum</command> command described below.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>vacuum</option></term> + + <listitem><para>Deletes old installed versions until the limits configured via + <varname>InstanceMax=</varname> in + <citerefentry><refentrytitle>sysupdate.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> are + met again. Normally, it should not be necessary to invoke this command explicitly, since it is + implicitly invoked whenever a new update is initiated.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>pending</option></term> + + <listitem><para>Checks whether a newer version of the OS is installed than the one currently + running. Returns zero if so, non-zero otherwise. This compares the newest installed version's + identifier with the OS image version as reported by the <varname>IMAGE_VERSION=</varname> field in + <filename>/etc/os-release</filename>. If the former is newer than the latter, an update was + apparently completed but not activated (i.e. rebooted into) yet.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>reboot</option></term> + + <listitem><para>Similar to the <option>pending</option> command but immediately reboots in case a + newer version of the OS has been installed than the one currently running. This operation can be done + implicitly together with the <command>update</command> command, after a completed update via the + <option>--reboot</option> switch, see below. This command will execute no operation (and return + success) if no update has been installed, and thus the system was not rebooted.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>components</option></term> + + <listitem><para>Lists components that can be updated. This enumerates the + <filename>/etc/sysupdate.*.d/</filename>, <filename>/run/sysupdate.*.d/</filename> and + <filename>/usr/lib/sysupdate.*.d/</filename> directories that contain transfer files. This command is + useful to list possible parameters for <option>--component=</option> (see below).</para></listitem> + </varlistentry> + + <xi:include href="standard-options.xml" xpointer="help" /> + <xi:include href="standard-options.xml" xpointer="version" /> + </variablelist> + </refsect1> + + <refsect1> + <title>Options</title> + + <para>The following options are understood:</para> + + <variablelist> + + <varlistentry> + <term><option>--component=</option></term> + <term><option>-C</option></term> + + <listitem><para>Selects the component to update. Takes a component name as argument. This has the + effect of slightly altering the search logic for transfer files. If this switch is not used, the + transfer files are loaded from <filename>/etc/sysupdate.d/*.conf</filename>, + <filename>/run/sysupdate.d/*.conf</filename> and <filename>/usr/lib/sysupdate.d/*.conf</filename>. If + this switch is used, the specified component name is used to alter the directories to look in to be + <filename>/etc/sysupdate.<replaceable>component</replaceable>.d/*.conf</filename>, + <filename>/run/sysupdate.<replaceable>component</replaceable>.d/*.conf</filename> and + <filename>/usr/lib/sysupdate.<replaceable>component</replaceable>.d/*.conf</filename>, each time with + the <filename><replaceable>component</replaceable></filename> string replaced with the specified + component name.</para> + + <para>Use the <command>components</command> command to list available components to update. This enumerates + the directories matching this naming rule.</para> + + <para>Components may be used to define a separate set of transfer files for different components of + the OS that shall be updated separately. Do not use this concept for resources that shall always be + updated together in a synchronous fashion. Simply define multiple transfer files within the same + <filename>sysupdate.d/</filename> directory for these cases.</para> + + <para>This option may not be combined with <option>--definitions=</option>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--definitions=</option></term> + + <listitem><para>A path to a directory. If specified, the transfer <filename>*.conf</filename> files + are read from this directory instead of <filename>/usr/lib/sysupdate.d/*.conf</filename>, + <filename>/etc/sysupdate.d/*.conf</filename>, and <filename>/run/sysupdate.d/*.conf</filename>.</para> + + <para>This option may not be combined with <option>--component=</option>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--root=</option></term> + + <listitem><para>Takes a path to a directory to use as root file system when searching for + <filename>sysupdate.d/*.conf</filename> files.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--image=</option></term> + + <listitem><para>Takes a path to a disk image file or device to mount and use in a similar fashion to + <option>--root=</option>, see above. If this is used and partition resources are updated this is done + inside the specified disk image.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--instances-max=</option></term> + <term><option>-m</option></term> + + <listitem><para>Takes a decimal integer greater than or equal to 2. Controls how many versions to + keep at any time. This option may also be configured inside the transfer files, via the + <varname>InstancesMax=</varname> setting, see + <citerefentry><refentrytitle>sysupdate.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> for + details.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--sync=</option></term> + + <listitem><para>Takes a boolean argument, defaults to yes. This may be used to specify whether the + newly updated resource versions shall be synchronized to disk when appropriate (i.e. after the + download is complete, before it is finalized, and again after finalization). This should not be + turned off, except to improve runtime performance in testing environments.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--verify=</option></term> + + <listitem><para>Takes a boolean argument, defaults to yes. Controls whether to cryptographically + verify downloads. Do not turn this off, except in testing environments.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--reboot</option></term> + + <listitem><para>When used in combination with the <command>update</command> command and a new version is + installed, automatically reboots the system immediately afterwards.</para></listitem> + </varlistentry> + + <xi:include href="standard-options.xml" xpointer="no-pager" /> + <xi:include href="standard-options.xml" xpointer="no-legend" /> + <xi:include href="standard-options.xml" xpointer="json" /> + </variablelist> + </refsect1> + + <refsect1> + <title>Exit status</title> + + <para>On success, 0 is returned, a non-zero failure code otherwise.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sysupdate.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-repart</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |