+++ /dev/null
-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!-- SPDX-License-Identifier: LGPL-2.1+ -->
-
-<refentry id="portablectl" conditional='ENABLE_PORTABLED'
- xmlns:xi="http://www.w3.org/2001/XInclude">
-
- <refentryinfo>
- <title>portablectl</title>
- <productname>elogind</productname>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>portablectl</refentrytitle>
- <manvolnum>1</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>portablectl</refname>
- <refpurpose>Attach, detach or inspect portable service images</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <cmdsynopsis>
- <command>portablectl</command>
- <arg choice="opt" rep="repeat">OPTIONS</arg>
- <arg choice="req">COMMAND</arg>
- <arg choice="opt" rep="repeat">NAME</arg>
- </cmdsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><command>portablectl</command> may be used to attach, detach or inspect portable service images. It's
- primarily a command interfacing with
- <citerefentry><refentrytitle>elogind-portabled.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
-
- <para>Portable service images contain an OS file system tree along with
- <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>1</manvolnum></citerefentry> unit file
- information. A service image may be "attached" to the local system. If attached, a set of unit files are copied
- from the image to the host, and extended with <varname>RootDirectory=</varname> or <varname>RootImage=</varname>
- assignments (in case of service units) pointing to the image file or directory, ensuring the services will run
- within the file system context of the image.</para>
-
- <para>Portable service images are an efficient way to bundle multiple related services and other units together,
- and transfer them as a whole between systems. When these images are attached the local system the contained units
- may run in most ways like regular system-provided units, either with full privileges or inside strict sandboxing,
- depending on the selected configuration.</para>
-
- <para>Specifically portable service images may be of the following kind:</para>
-
- <itemizedlist>
- <listitem><para>Directory trees containing an OS, including the top-level directories <filename>/usr/</filename>,
- <filename>/etc/</filename>, and so on.</para></listitem>
-
- <listitem><para>btrfs subvolumes containing OS trees, similar to normal directory trees.</para></listitem>
-
- <listitem><para>Binary "raw" disk images containing MBR or GPT partition tables and Linux file system
- partitions.</para></listitem>
- </itemizedlist>
-
- </refsect1>
-
- <refsect1>
- <title>Options</title>
-
- <para>The following options are understood:</para>
-
- <variablelist>
- <varlistentry>
- <term><option>-q</option></term>
- <term><option>--quiet</option></term>
-
- <listitem><para>Suppresses additional informational output while running.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>-p</option> <replaceable>PROFILE</replaceable></term>
- <term><option>--profile=</option><replaceable>PROFILE</replaceable></term>
-
- <listitem><para>When attaching an image, select the profile to use. By default the <literal>default</literal>
- profile is used. For details about profiles, see below.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--copy=</option></term>
-
- <listitem><para>When attaching an image, select whether to prefer copying or symlinking of files installed into
- the host system. Takes one of <literal>copy</literal> (to prefer copying of files), <literal>symlink</literal>
- (to prefer creation of symbolic links) or <literal>auto</literal> for an intermediary mode where security
- profile drop-ins are symlinked while unit files are copied. Note that this option expresses a preference only,
- in cases where symbolic links cannot be created — for example when the image operated on is a raw disk image,
- and hence not directly referentiable from the host file system — copying of files is used
- unconditionally.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--runtime</option></term>
-
- <listitem><para>When specified the unit and drop-in files are placed in
- <filename>/run/systemd/system/</filename> instead of <filename>/etc/systemd/system/</filename>. Images attached
- with this option set hence remain attached only until the next reboot, while they are normally attached
- persistently.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--no-reload</option></term>
-
- <listitem><para>Don't reload the service manager after attaching or detaching a portable service
- image. Normally the service manager is reloaded to ensure it is aware of added or removed unit
- files.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--cat</option></term>
-
- <listitem><para>When inspecting portable service images, show the (unprocessed) contents of the metadata files
- pulled from the image, instead of brief summaries. Specifically, this will show the
- <citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry> and unit file
- contents of the image.</para></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>Commands</title>
-
- <para>The following commands are understood:</para>
-
- <variablelist>
-
- <varlistentry>
- <term><command>list</command></term>
-
- <listitem><para>List available portable service images. This will list all portable service images discovered
- in the portable image search paths (see below), along with brief metadata and state information. Note that many
- of the commands below may both operate on images inside and outside of the search paths. This command is hence
- mostly a convenience option, the commands are generally not restricted to what this list
- shows.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>attach</command> <replaceable>IMAGE</replaceable> [<replaceable>PREFIX…</replaceable>]</term>
-
- <listitem><para>Attach a portable service image to the host system. Expects a file system path to a portable
- service image file or directory as first argument. If the specified path contains no slash character
- (<literal>/</literal>) it is understood as image filename that is searched for in the portable service image
- search paths (see below). To reference a file in the current working directory prefix the filename with
- <literal>./</literal> to avoid this search path logic.</para>
-
- <para>When a portable service is attached four operations are executed:</para>
-
- <orderedlist>
-
- <listitem><para>All unit files of types <filename>.service</filename>, <filename>.socket</filename>,
- <filename>.target</filename>, <filename>.timer</filename> and <filename>.path</filename> which match the
- indicated unit file name prefix are copied from the image to the host's
- <filename>/etc/systemd/system/</filename> directory (or <filename>/run/systemd/system/</filename> — depending
- whether <option>--runtime</option> is specified, see above).</para></listitem>
-
- <listitem><para>For unit files of type <filename>.service</filename> a drop-in is added to these copies that
- adds <varname>RootDirectory=</varname> or <varname>RootImage=</varname> settings (see
- <citerefentry><refentrytitle>elogind.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
- details), that ensures these services are run within the file system of the originating portable service
- image.</para></listitem>
-
- <listitem><para>A second drop-in is created: the "profile" drop-in, that may contain additional security
- settings (and other settings). A number of profiles are available by default but administrators may define
- their own ones. See below.</para></listitem>
-
- <listitem><para>If the portable service image file is not already in the search path (see below), a symbolic
- link to it is created in <filename>/etc/portables/</filename> or
- <filename>/run/portables/</filename>, to make sure it is included in it.</para></listitem>
- </orderedlist>
-
- <para>By default all unit files whose names start with a prefix generated from the image's file name are copied
- out. Specifically, the prefix is determined from the image file name with any suffix such as
- <filename>.raw</filename> removed, truncated at the first occurrence of and underscore character
- (<literal>_</literal>), if there is one. The underscore logic is supposed to be used to versioning so that the
- an image file <filename>foobar_47.11.raw</filename> will result in a unit file matching prefix of
- <filename>foobar</filename>. This prefix is then compared with all unit files names contained in the image in
- the usual directories, but only unit file names where the prefix is followed by <literal>-</literal>,
- <literal>.</literal> or <literal>@</literal> are considered. Example: if a portable service image file is named
- <filename>foobar_47.11.raw</filename> then by default all its unit files with names such as
- <filename>foobar-quux-waldi.service</filename>, <filename>foobar.service</filename> or
- <filename>foobar@.service</filename> will be considered. It's possible to override the matching prefix: all
- strings listed on the command line after the image file name are considered prefixes, overriding the implicit
- logic where the prefix is derived from the image file name.</para>
-
- <para>By default, after the unit files are attached the service manager's configuration is reloaded, except
- when <option>--no-reload</option> is specified (see above). This ensures that the new units made available to
- the service manager are seen by it.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>detach</command> <replaceable>IMAGE</replaceable></term>
-
- <listitem><para>Detaches a portable service image from the host. This undoes the operations executed by the
- <command>attach</command> command above, and removes the unit file copies, drop-ins and image symlink
- again. This command expects an image name or path as parameter. Note that if a path is specified only the last
- component of it (i.e. the file or directory name itself, not the path to it) is used for finding matching unit
- files. This is a convencience feature to allow all arguments passed as <command>attach</command> also to
- <command>detach</command>.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>inspect</command> <replaceable>IMAGE</replaceable> [<replaceable>PREFIX…</replaceable>]</term>
-
- <listitem><para>Extracts various metadata from a portable service image and presents it to the
- caller. Specifically, the
- <citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry> file of the
- image is retrieved as well as all matching unit files. By default a short summary showing the most relevant
- metadata in combination with a list of matching unit files is shown (that is the unit files
- <command>attach</command> would install to the host system). If combined with <option>--cat</option> (see
- above), the <filename>os-release</filename> data and the units files' contents is displayed unprocessed. This
- command is useful to determine whether an image qualifies as portable service image, and which unit files are
- included. This command expects the path to the image as parameter, optionally followed by a list of unit file
- prefixes to consider, similar to the <command>attach</command> command described above.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>is-attached</command> <replaceable>IMAGE</replaceable></term>
-
- <listitem><para>Determines whether the specified image is currently attached or not. Unless combined with the
- <option>--quiet</option> switch this will show a short state identifier for the image. Specifically:</para>
-
- <table>
- <title>Image attachment states</title>
- <tgroup cols='2'>
- <colspec colname='state'/>
- <colspec colname='description'/>
- <thead>
- <row>
- <entry>State</entry>
- <entry>Description</entry>
- </row>
- </thead>
- <tbody>
- <row>
- <entry><option>detached</option></entry>
- <entry>The image is currently not attached.</entry>
- </row>
- <row>
- <entry><option>attached</option></entry>
- <entry>The image is currently attached, i.e. its unit files have been made available to the host system.</entry>
- </row>
- <row>
- <entry><option>attached-runtime</option></entry>
- <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>
- </row>
- <row>
- <entry><option>enabled</option></entry>
- <entry>The image is currently attached, and at least one unit file associated with it has been enabled.</entry>
- </row>
- <row>
- <entry><option>enabled-runtime</option></entry>
- <entry>Like <option>enabled</option>, but the 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>
- </row>
- <row>
- <entry><option>running</option></entry>
- <entry>The image is currently attached, and at least one unit file associated with it is running.</entry>
- </row>
- <row>
- <entry><option>running-runtime</option></entry>
- <entry>The image is currently attached transiently, and at least one unit file associated with it is running.</entry>
- </row>
- </tbody>
- </tgroup>
- </table>
-
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>read-only</command> <replaceable>IMAGE</replaceable> [<replaceable>BOOL</replaceable>]</term>
-
- <listitem><para>Marks or (unmarks) a portable service image read-only. Takes an image name, followed by a
- boolean as arguments. If the boolean is omitted, positive is implied, i.e. the image is marked
- read-only.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>remove</command> <replaceable>IMAGE</replaceable>…</term>
-
- <listitem><para>Removes one or more portable service images. Note that this command will only remove the
- specified image path itself — it refers to a symbolic link then the symbolic link is removed and not the
- image it points to.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>set-limit</command> [<replaceable>IMAGE</replaceable>] <replaceable>BYTES</replaceable></term>
-
- <listitem><para>Sets the maximum size in bytes that a specific portable service image, or all images, may grow
- up to on disk (disk quota). Takes either one or two parameters. The first, optional parameter refers to a
- portable service image name. If specified, the size limit of the specified image is changed. If omitted, the
- overall size limit of the sum of all images stored locally is changed. The final argument specifies the size
- limit in bytes, possibly suffixed by the usual K, M, G, T units. If the size limit shall be disabled, specify
- <literal>-</literal> as size.</para>
-
- <para>Note that per-image size limits are only supported on btrfs file systems. Also, depending on
- <varname>BindPaths=</varname> settings in the portable service's unit files directories from the host might be
- visible in the image environment during runtime which are not affected by this setting, as only the image
- itself is counted against this limit.</para></listitem>
- </varlistentry>
-
- </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>
- </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/elogind/portable/profile/</filename>. Additional, local profiles may be defined by placing them
- in <filename>/etc/elogind/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 this profiles, and their effects please have a look at their precise definitions,
- e.g. <filename>/usr/lib/elogind/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="less-variables.xml" />
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>elogind-portabled.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>
~ianmdlvl / elogind.git / commitdiff