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| <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
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| <!-- 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>systemd</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>systemd-portabled.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
| |
| <para>Portable service images contain an OS file system tree along with |
| <citerefentry><refentrytitle>systemd</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. (These must be regular files, with the <filename>.raw</filename> suffix.)</para></listitem> |
| </itemizedlist> |
| |
| </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.attached/</filename> directory (or |
| <filename>/run/systemd/system.attached/</filename> — depending whether <option>--runtime</option> is |
| specified, see above), which is included in the built-in unit search path of the system service |
| manager.</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>systemd.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 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>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.attached/</filename> instead of |
| <filename>/etc/systemd/system.attached/</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>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 this profiles, and their effects please have a look at 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="less-variables.xml" /> |
| |
| <refsect1> |
| <title>See Also</title> |
| <para> |
| <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, |
| <citerefentry><refentrytitle>systemd-portabled.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
| </para> |
| </refsect1> |
| |
| </refentry> |