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71 lines
3.2 KiB
XML
71 lines
3.2 KiB
XML
<?xml version='1.0'?> <!--*-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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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-mountfsd.service" conditional='ENABLE_MOUNTFSD'>
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<refentryinfo>
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<title>systemd-mountfsd.service</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-mountfsd.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-mountfsd.service</refname>
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<refname>systemd-mountfsd</refname>
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<refpurpose>Disk Image File System Mount Service</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-mountfsd.service</filename></para>
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<para><filename>/usr/lib/systemd/systemd-mountfsd</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-mountfsd</command> is a system service that dissects disk images, and returns mount
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file descriptors for the file systems contained therein to clients, via a Varlink IPC API.</para>
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<para>The disk images provided must contain a raw file system image or must follow the <ulink
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url="https://uapi-group.org/specifications/specs/discoverable_partitions_specification/">Discoverable
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Partitions Specification</ulink>. Before mounting any file systems authenticity of the disk image is
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established in one or a combination of the following ways:</para>
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<orderedlist>
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<listitem><para>If the disk image is located in a regular file in one of the directories
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<filename>/var/lib/machines/</filename>, <filename>/var/lib/portables/</filename>,
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<filename>/var/lib/extensions/</filename>, <filename>/var/lib/confexts/</filename> or their
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counterparts in the <filename>/etc/</filename>, <filename>/run/</filename>,
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<filename>/usr/lib/</filename> it is assumed to be trusted.</para></listitem>
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<listitem><para>If the disk image contains a Verity enabled disk image, along with a signature
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partition with a key in the kernel keyring or in <filename>/etc/verity.d/</filename> (and related
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directories) the disk image is considered trusted.</para></listitem>
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</orderedlist>
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<para>This service provides one <ulink url="https://varlink.org/">Varlink</ulink> service:
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<constant>io.systemd.MountFileSystem</constant> which accepts a file descriptor to a regular file or
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block device, and returns a number of file descriptors referring to an <function>fsmount()</function>
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file descriptor the client may then attach to a path of their choice.</para>
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<para>The returned mounts are automatically allowlisted in the per-user-namespace allowlist maintained by
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<citerefentry><refentrytitle>systemd-nsresourced.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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<para>The file systems are automatically fsck'ed before mounting.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-nsresourced.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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