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195 lines
8.7 KiB
XML
195 lines
8.7 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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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/4.2/docbookx.dtd" [
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<!ENTITY % entities SYSTEM "custom-entities.ent" >
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%entities;
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]>
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-import-generator"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-import-generator</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-import-generator</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-import-generator</refname>
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<refpurpose>Generator for automatically downloading disk images at boot</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/usr/lib/systemd/system-generators/systemd-import-generator</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-import-generator</command> may be used to automatically download disk images
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(tarballs or DDIs) via
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<citerefentry><refentrytitle>systemd-importd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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at boot, based on parameters on the kernel command line or via system credentials. This is useful for
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automatically deploying an
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<citerefentry><refentrytitle>systemd-confext</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-sysext</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>/
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<citerefentry><refentrytitle>systemd-vmspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry> or
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<citerefentry><refentrytitle>systemd-portabled.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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image at boot. This provides functionality equivalent to
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<citerefentry><refentrytitle>importctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, but
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accessible via the kernel command line and system credentials.</para>
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<para><filename>systemd-import-generator</filename> implements
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<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
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</refsect1>
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<refsect1>
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<title>Kernel Command Line</title>
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<para><filename>systemd-import-generator</filename> understands the following
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<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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parameters:</para>
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<variablelist class='kernel-commandline-options'>
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<varlistentry>
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<term><varname>systemd.pull=</varname></term>
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<listitem><para>This option takes a colon separate triplet of option string, local target image name
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and remote URL. The local target image name can be specified as an empty string, in which case the
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name is derived from the specified remote URL. The remote URL must using the
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<literal>http://</literal>, <literal>https://</literal>, <literal>file://</literal> schemes. The
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option string itself is a comma separated list of options:</para>
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<variablelist>
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<varlistentry>
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<term>rw</term>
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<term>ro</term>
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<listitem><para>Controls whether to mark the local image as read-only. If not
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specified read-only defaults to off.</para>
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<xi:include href="version-info.xml" xpointer="v257"/></listitem>
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</varlistentry>
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<varlistentry>
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<term>verify=</term>
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<listitem><para>Controls whether to cryptographically validate the download before installing it
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in place. Takes one of <literal>no</literal>, <literal>checksum</literal> or
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<literal>signature</literal> (the latter being the default if not specified). For details see the
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<option>--verify=</option> of
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<citerefentry><refentrytitle>importctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></para>
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<xi:include href="version-info.xml" xpointer="v257"/></listitem>
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</varlistentry>
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<varlistentry>
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<term>sysext</term>
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<term>confext</term>
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<term>machine</term>
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<term>portable</term>
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<listitem><para>Controls the image class to download, and thus ultimately the target directory
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for the image, depending on this choice the target directory
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<filename>/var/lib/extensions/</filename>, <filename>/var/lib/confexts/</filename>,
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<filename>/var/lib/machines/</filename> or <filename>/var/lib/portables/</filename> is
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selected.</para>
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<para>Specification of exactly one of these options is mandatory.</para>
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<xi:include href="version-info.xml" xpointer="v257"/></listitem>
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</varlistentry>
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<varlistentry>
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<term>tar</term>
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<term>raw</term>
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<listitem><para>Controls the type of resource to download, i.e. a (possibly compressed) tarball
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that needs to be unpacked into a file system tree, or (possibly compressed) raw disk image (DDI).</para>
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<para>Specification of exactly one of these options is mandatory.</para>
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<xi:include href="version-info.xml" xpointer="v257"/></listitem>
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</varlistentry>
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</variablelist>
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<xi:include href="version-info.xml" xpointer="v257"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>systemd.pull.success_action=</varname></term>
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<term><varname>systemd.pull.failure_action=</varname></term>
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<listitem><para>Controls whether to execute an action such as reboot, power-off and similar after
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completing the download successfully, or unsuccessfully. See
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<varname>SuccessAction=</varname>/<varname>FailureAction=</varname> on
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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details about the available actions. If not specified no action is taken, and the system will
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continue to boot normally.</para>
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<xi:include href="version-info.xml" xpointer="v257"/></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>Credentials</title>
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<para><command>systemd-import-generator</command> supports the system credentials logic. The following
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credentials are used when passed in:</para>
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<variablelist class='system-credentials'>
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<varlistentry>
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<term><varname>import.pull</varname></term>
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<listitem><para>This credential should be a text file, with each line referencing one download
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operation. Each line should follow the same format as the value of the
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<varname>systemd.pull=</varname> kernel command line option described above.</para>
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<xi:include href="version-info.xml" xpointer="v257"/></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>Examples</title>
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<example>
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<title>Download Configuration Extension</title>
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<programlisting>systemd.pull=raw,confext::https://example.com/myconfext.raw.gz</programlisting>
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<para>With a kernel command line option like the above a configuration extension DDI is downloaded
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automatically at boot from the specified URL, validated cryptographically, uncompressed and installed.</para>
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</example>
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<example>
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<title>Download System Extension (Without Validation)</title>
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<programlisting>systemd.pull=tar,sysext,verify=no::https://example.com/mysysext.tar.gz</programlisting>
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<para>With a kernel command line option like the above a system extension tarball is downloaded
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automatically at boot from the specified URL, uncompressed and installed – without any cryptographic
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validation. This is useful for development purposes in virtual machines and containers. Warning: do not
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deploy a system with validation disabled like this!</para>
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</example>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd-importd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd.system-credentials</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>importctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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