mirror of
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fd571c9df0
This also replaces the Fedora download example with another one from Ubuntu, since Fedora's images these days no longer qualify as DDIs, they have no distinctive partition type UUIDs set for multiple of their partitions, hence the images cannot be booted. A bit sad. Let's provide a command that just works in its place.
519 lines
27 KiB
XML
519 lines
27 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="portablectl" conditional='ENABLE_PORTABLED'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>portablectl</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>portablectl</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>portablectl</refname>
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<refpurpose>Attach, detach or inspect portable service images</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>portablectl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="req">COMMAND</arg>
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<arg choice="opt" rep="repeat">NAME</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>portablectl</command> may be used to attach, detach or inspect portable service images. It's
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primarily a command interfacing with
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<citerefentry><refentrytitle>systemd-portabled.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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<para>Portable service images contain an OS file system tree along with
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> unit file
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information. A service image may be "attached" to the local system. If attached, a set of unit files are copied
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from the image to the host, and extended with <varname>RootDirectory=</varname> or <varname>RootImage=</varname>
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assignments (in case of service units) pointing to the image file or directory, ensuring the services will run
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within the file system context of the image.</para>
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<para>Portable service images are an efficient way to bundle multiple related services and other units together,
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and transfer them as a whole between systems. When these images are attached to the local system, the contained units
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may run in most ways like regular system-provided units, either with full privileges or inside strict sandboxing,
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depending on the selected configuration. For more details, see
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<ulink url="https://systemd.io/PORTABLE_SERVICES">Portable Services Documentation</ulink>.</para>
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<para>Portable service images may be of the following kinds:</para>
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<itemizedlist>
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<listitem><para>Directory trees containing an OS, including the top-level directories <filename>/usr/</filename>,
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<filename>/etc/</filename>, and so on.</para></listitem>
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<listitem><para>btrfs subvolumes containing OS trees, similar to normal directory trees.</para></listitem>
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<listitem><para>Binary "raw" disk images containing MBR or GPT partition tables and Linux file system
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partitions. (These must be regular files, with the <filename>.raw</filename> suffix.)</para></listitem>
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</itemizedlist>
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</refsect1>
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<refsect1>
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<title>Commands</title>
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<para>The following commands are understood:</para>
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<variablelist>
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<varlistentry>
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<term><command>list</command></term>
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<listitem><para>List available portable service images. This will list all portable service images discovered
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in the portable image search paths (see below), along with brief metadata and state information. Note that many
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of the commands below may both operate on images inside and outside of the search paths. This command is hence
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mostly a convenience option, the commands are generally not restricted to what this list
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shows.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>attach</command> <replaceable>IMAGE</replaceable> [<replaceable>PREFIX…</replaceable>]</term>
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<listitem><para>Attach a portable service image to the host system. Expects a file system path to a portable
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service image file or directory as first argument. If the specified path contains no slash character
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(<literal>/</literal>) it is understood as image filename that is searched for in the portable service image
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search paths (see below). To reference a file in the current working directory prefix the filename with
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<literal>./</literal> to avoid this search path logic.</para>
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<para>When a portable service is attached four operations are executed:</para>
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<orderedlist>
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<listitem><para>All unit files of types <filename>.service</filename>, <filename>.socket</filename>,
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<filename>.target</filename>, <filename>.timer</filename> and <filename>.path</filename> which match the
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indicated unit file name prefix are copied from the image to the host's
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<filename>/etc/systemd/system.attached/</filename> directory (or
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<filename>/run/systemd/system.attached/</filename> — depending whether <option>--runtime</option> is
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specified, see below), which is included in the built-in unit search path of the system service
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manager.</para></listitem>
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<listitem><para>For unit files of type <filename>.service</filename> a drop-in is added to these copies that
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adds <varname>RootDirectory=</varname> or <varname>RootImage=</varname> settings (see
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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details), that ensures these services are run within the file system of the originating portable service
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image.</para></listitem>
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<listitem><para>A second drop-in is created: the "profile" drop-in, that may contain additional security
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settings (and other settings). A number of profiles are available by default but administrators may define
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their own ones. See below.</para></listitem>
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<listitem><para>If the portable service image file is not already in the search path (see below), a symbolic
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link to it is created in <filename>/etc/portables/</filename> or
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<filename>/run/portables/</filename>, to make sure it is included in it.</para></listitem>
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</orderedlist>
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<para>By default all unit files whose names start with a prefix generated from the image's file name are copied
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out. Specifically, the prefix is determined from the image file name with any suffix such as
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<filename>.raw</filename> removed, truncated at the first occurrence of an underscore character
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(<literal>_</literal>), if there is one. The underscore logic is supposed to be used to versioning so that the
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an image file <filename>foobar_47.11.raw</filename> will result in a unit file matching prefix of
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<filename>foobar</filename>. This prefix is then compared with all unit files names contained in the image in
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the usual directories, but only unit file names where the prefix is followed by <literal>-</literal>,
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<literal>.</literal> or <literal>@</literal> are considered. Example: if a portable service image file is named
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<filename>foobar_47.11.raw</filename> then by default all its unit files with names such as
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<filename>foobar-quux-waldi.service</filename>, <filename>foobar.service</filename> or
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<filename>foobar@.service</filename> will be considered. It's possible to override the matching prefix: all
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strings listed on the command line after the image file name are considered prefixes, overriding the implicit
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logic where the prefix is derived from the image file name.</para>
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<para>By default, after the unit files are attached the service manager's configuration is reloaded, except
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when <option>--no-reload</option> is specified (see below). This ensures that the new units made available to
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the service manager are seen by it.</para>
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<para>If <option>--now</option> and/or <option>--enable</option> are passed, the portable services are
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immediately started (blocking operation unless <option>--no-block</option> is passed) and/or enabled after
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attaching the image.</para>
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<xi:include href="version-info.xml" xpointer="v239"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><command>detach</command> <replaceable>IMAGE</replaceable> [<replaceable>PREFIX…</replaceable>]</term>
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<listitem><para>Detaches a portable service image from the host. This undoes the operations executed by the
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<command>attach</command> command above, and removes the unit file copies, drop-ins and image symlink
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again. This command expects an image name or path as parameter. Note that if a path is specified only the last
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component of it (i.e. the file or directory name itself, not the path to it) is used for finding matching unit
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files. This is a convenience feature to allow all arguments passed as <command>attach</command> also to
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<command>detach</command>.</para>
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<para>If <option>--now</option> and/or <option>--enable</option> are passed, the portable services are
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immediately stopped (blocking operation) and/or disabled before detaching the image. Prefix(es) are also accepted,
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to be used in case the unit names do not match the image name as described in the <command>attach</command>.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>reattach</command> <replaceable>IMAGE</replaceable> [<replaceable>PREFIX…</replaceable>]</term>
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<listitem><para>Detaches an existing portable service image from the host, and immediately attaches it again.
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This is useful in case the image was replaced. Running units are not stopped during the process. Partial matching,
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to allow for different versions in the image name, is allowed: only the part before the first <literal>_</literal>
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character has to match. If the new image doesn't exist, the existing one will not be detached. The parameters
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follow the same syntax as the <command>attach</command> command.</para>
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<para>If <option>--now</option> and/or <option>--enable</option> are passed, the portable services are
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immediately stopped if removed, started and/or enabled if added, or restarted if updated. Prefixes are also
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accepted, in the same way as described in the <command>attach</command> case.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>inspect</command> <replaceable>IMAGE</replaceable> [<replaceable>PREFIX…</replaceable>]</term>
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<listitem><para>Extracts various metadata from a portable service image and presents it to the
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caller. Specifically, the
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<citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry> file of the
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image is retrieved as well as all matching unit files. By default a short summary showing the most relevant
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metadata in combination with a list of matching unit files is shown (that is the unit files
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<command>attach</command> would install to the host system). If combined with <option>--cat</option> (see
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above), the <filename>os-release</filename> data and the units files' contents is displayed unprocessed. This
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command is useful to determine whether an image qualifies as portable service image, and which unit files are
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included. This command expects the path to the image as parameter, optionally followed by a list of unit file
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prefixes to consider, similar to the <command>attach</command> command described above.</para>
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<xi:include href="version-info.xml" xpointer="v239"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><command>is-attached</command> <replaceable>IMAGE</replaceable></term>
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<listitem><para>Determines whether the specified image is currently attached or not. Unless combined with the
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<option>--quiet</option> switch this will show a short state identifier for the image. Specifically:</para>
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<table>
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<title>Image attachment states</title>
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<tgroup cols='2'>
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<colspec colname='state'/>
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<colspec colname='description'/>
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<thead>
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<row>
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<entry>State</entry>
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<entry>Description</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><option>detached</option></entry>
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<entry>The image is currently not attached.</entry>
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</row>
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<row>
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<entry><option>attached</option></entry>
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<entry>The image is currently attached, i.e. its unit files have been made available to the host system.</entry>
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</row>
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<row>
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<entry><option>attached-runtime</option></entry>
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<entry>Like <option>attached</option>, but the unit files have been made available transiently only, i.e. the <command>attach</command> command has been invoked with the <option>--runtime</option> option.</entry>
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</row>
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<row>
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<entry><option>enabled</option></entry>
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<entry>The image is currently attached, and at least one unit file associated with it has been enabled.</entry>
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</row>
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<row>
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<entry><option>enabled-runtime</option></entry>
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<entry>Like <option>enabled</option>, but the unit files have been made available transiently only, i.e. the <command>attach</command> command has been invoked with the <option>--runtime</option> option.</entry>
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</row>
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<row>
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<entry><option>running</option></entry>
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<entry>The image is currently attached, and at least one unit file associated with it is running.</entry>
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</row>
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<row>
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<entry><option>running-runtime</option></entry>
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<entry>The image is currently attached transiently, and at least one unit file associated with it is running.</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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<xi:include href="version-info.xml" xpointer="v239"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><command>read-only</command> <replaceable>IMAGE</replaceable> [<replaceable>BOOL</replaceable>]</term>
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<listitem><para>Marks or (unmarks) a portable service image read-only. Takes an image name, followed by a
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boolean as arguments. If the boolean is omitted, positive is implied, i.e. the image is marked
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read-only.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>remove</command> <replaceable>IMAGE</replaceable>…</term>
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<listitem><para>Removes one or more portable service images. Note that this command will only remove the
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specified image path itself — it refers to a symbolic link then the symbolic link is removed and not the
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image it points to.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-limit</command> [<replaceable>IMAGE</replaceable>] <replaceable>BYTES</replaceable></term>
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<listitem><para>Sets the maximum size in bytes that a specific portable service image, or all images, may grow
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up to on disk (disk quota). Takes either one or two parameters. The first, optional parameter refers to a
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portable service image name. If specified, the size limit of the specified image is changed. If omitted, the
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overall size limit of the sum of all images stored locally is changed. The final argument specifies the size
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limit in bytes, possibly suffixed by the usual K, M, G, T units. If the size limit shall be disabled, specify
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<literal>-</literal> as size.</para>
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<para>Note that per-image size limits are only supported on btrfs file systems. Also, depending on
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<varname>BindPaths=</varname> settings in the portable service's unit files directories from the host might be
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visible in the image environment during runtime which are not affected by this setting, as only the image
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itself is counted against this limit.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></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>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>-q</option></term>
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<term><option>--quiet</option></term>
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<listitem><para>Suppresses additional informational output while running.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p</option> <replaceable>PROFILE</replaceable></term>
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<term><option>--profile=</option><replaceable>PROFILE</replaceable></term>
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<listitem><para>When attaching an image, select the profile to use. By default the <literal>default</literal>
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profile is used. For details about profiles, see below.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--copy=</option></term>
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<listitem><para>When attaching an image, select whether to prefer copying or symlinking of files
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installed into the host system. Takes one of <literal>copy</literal> (files will be copied),
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<literal>symlink</literal> (to prefer creation of symbolic links), <literal>auto</literal> for an
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intermediary mode where security profile drop-ins and images are symlinked while unit files are
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copied, or <literal>mixed</literal> (since v256) where security profile drop-ins are symlinked while
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unit files and images are copied. Note that this option expresses a preference only, in cases where
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symbolic links cannot be created — for example when the image operated on is a raw disk image, and
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hence not directly referentiable from the host file system — copying of files is used
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unconditionally.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--runtime</option></term>
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<listitem><para>When specified the unit and drop-in files are placed in
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<filename>/run/systemd/system.attached/</filename> instead of
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<filename>/etc/systemd/system.attached/</filename>. Images attached with this option set hence remain attached
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only until the next reboot, while they are normally attached persistently.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-reload</option></term>
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<listitem><para>Don't reload the service manager after attaching or detaching a portable service
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image. Normally the service manager is reloaded to ensure it is aware of added or removed unit
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files.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--cat</option></term>
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<listitem><para>When inspecting portable service images, show the (unprocessed) contents of the metadata files
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pulled from the image, instead of brief summaries. Specifically, this will show the
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<citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry> and unit file
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contents of the image.</para>
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<xi:include href="version-info.xml" xpointer="v239"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--enable</option></term>
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<listitem><para>Immediately enable/disable the portable service after attaching/detaching.</para>
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<xi:include href="version-info.xml" xpointer="v245"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--now</option></term>
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<listitem><para>Immediately start/stop/restart the portable service after attaching/before
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detaching/after upgrading.</para>
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<xi:include href="version-info.xml" xpointer="v245"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-block</option></term>
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<listitem><para>Don't block waiting for attach --now to complete.</para>
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<xi:include href="version-info.xml" xpointer="v245"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--extension=</option><replaceable>PATH</replaceable></term>
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<listitem><para>Add an additional image <replaceable>PATH</replaceable> as an overlay on
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top of <replaceable>IMAGE</replaceable> when attaching/detaching. This argument can be specified
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multiple times, in which case the order in which images are laid down follows the rules specified in
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for the <varname>ExtensionImages=</varname> directive and for the
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<citerefentry><refentrytitle>systemd-sysext</refentrytitle><manvolnum>8</manvolnum></citerefentry> and.
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<citerefentry><refentrytitle>systemd-confext</refentrytitle><manvolnum>8</manvolnum></citerefentry> tools.
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The images must contain an <filename>extension-release</filename> file with metadata that matches
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what is defined in the <filename>os-release</filename> of <replaceable>IMAGE</replaceable>. See:
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<citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
|
|
Images can be block images, btrfs subvolumes or directories. For more information on portable
|
|
services with extensions, see the <literal>Extension Images</literal> paragraph on
|
|
<ulink url="https://systemd.io/PORTABLE_SERVICES">Portable Services Documentation</ulink>.
|
|
</para>
|
|
|
|
<para>Note that the same extensions have to be specified, in the same order, when attaching
|
|
and detaching.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v249"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>--force</option></term>
|
|
|
|
<listitem><para>Skip safety checks and attach or detach images (with extensions) without first ensuring
|
|
that the units are not running, and do not insist that the
|
|
<filename>extension-release.<replaceable>NAME</replaceable></filename> file in the extension image has
|
|
to match the image filename.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v252"/></listitem>
|
|
</varlistentry>
|
|
|
|
<xi:include href="user-system-options.xml" xpointer="host" />
|
|
<xi:include href="user-system-options.xml" xpointer="machine" />
|
|
|
|
<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="no-ask-password" />
|
|
<xi:include href="standard-options.xml" xpointer="help" />
|
|
<xi:include href="standard-options.xml" xpointer="version" />
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Files and Directories</title>
|
|
|
|
<para>Portable service images are preferably stored in <filename>/var/lib/portables/</filename>, but are also
|
|
searched for in <filename>/etc/portables/</filename>, <filename>/run/systemd/portables/</filename>,
|
|
<filename>/usr/local/lib/portables/</filename> and <filename>/usr/lib/portables/</filename>. It's recommended not
|
|
to place image files directly in <filename>/etc/portables/</filename> or
|
|
<filename>/run/systemd/portables/</filename> (as these are generally not suitable for storing large or non-textual
|
|
data), but use these directories only for linking images located elsewhere into the image search path.</para>
|
|
|
|
<para>When a portable service image is attached, matching unit files are copied onto the host into the
|
|
<filename>/etc/systemd/system.attached/</filename> and <filename>/run/systemd/system.attached/</filename>
|
|
directories. When an image is detached, the unit files are removed again from these directories.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Profiles</title>
|
|
|
|
<para>When portable service images are attached a "profile" drop-in is linked in, which may be used to enforce
|
|
additional security (and other) restrictions locally. Four profile drop-ins are defined by default, and shipped in
|
|
<filename>/usr/lib/systemd/portable/profile/</filename>. Additional, local profiles may be defined by placing them
|
|
in <filename>/etc/systemd/portable/profile/</filename>. The default profiles are:</para>
|
|
|
|
<table>
|
|
<title>Profiles</title>
|
|
<tgroup cols='2'>
|
|
<colspec colname='state'/>
|
|
<colspec colname='description'/>
|
|
<thead>
|
|
<row>
|
|
<entry>Name</entry>
|
|
<entry>Description</entry>
|
|
</row>
|
|
</thead>
|
|
<tbody>
|
|
<row>
|
|
<entry><filename>default</filename></entry>
|
|
<entry>This is the default profile if no other profile name is set via the <option>--profile=</option> (see above). It's fairly restrictive, but should be useful for common, unprivileged system workloads. This includes write access to the logging framework, as well as IPC access to the D-Bus system.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><filename>nonetwork</filename></entry>
|
|
<entry>Very similar to <filename>default</filename>, but networking is turned off for any services of the portable service image.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><filename>strict</filename></entry>
|
|
<entry>A profile with very strict settings. This profile excludes IPC (D-Bus) and network access.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><filename>trusted</filename></entry>
|
|
<entry>A profile with very relaxed settings. In this profile the services run with full privileges.</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>For details on these profiles and their effects see their precise definitions,
|
|
e.g. <filename>/usr/lib/systemd/portable/profile/default/service.conf</filename> and similar.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Exit status</title>
|
|
|
|
<para>On success, 0 is returned, a non-zero failure code otherwise.</para>
|
|
</refsect1>
|
|
|
|
<xi:include href="common-variables.xml" />
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para><simplelist type="inline">
|
|
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-sysext</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>org.freedesktop.portable1</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-portabled.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>importctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
</simplelist></para>
|
|
</refsect1>
|
|
|
|
</refentry>
|