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SYSTEMD-....SERVICE(8) systemd-mountfsd.service SYSTEMD-....SERVICE(8)
systemd-mountfsd.service, systemd-mountfsd - Disk Image File
System Mount Service
systemd-mountfsd.service
/usr/lib/systemd/systemd-mountfsd
systemd-mountfsd is a system service that dissects disk images,
and returns mount file descriptors for the file systems contained
therein to clients, via a Varlink IPC API.
The disk images provided must contain a raw file system image or
must follow the Discoverable Partitions Specification[1]. Before
mounting any file systems authenticity of the disk image is
established in one or a combination of the following ways:
1. If the disk image is located in a regular file in one of the
directories /var/lib/machines/, /var/lib/portables/,
/var/lib/extensions/, /var/lib/confexts/ or their
counterparts in the /etc/, /run/, /usr/lib/ it is assumed to
be trusted.
2. If the disk image contains a Verity enabled disk image, along
with a signature partition with a key in the kernel keyring
or in /etc/verity.d/ (and related directories) the disk image
is considered trusted.
This service provides one Varlink[2] service:
io.systemd.MountFileSystem which accepts a file descriptor to a
regular file or block device, and returns a number of file
descriptors referring to an fsmount() file descriptor the client
may then attach to a path of their choice.
The returned mounts are automatically allowlisted in the
per-user-namespace allowlist maintained by
systemd-nsresourced.service(8).
The file systems are automatically fsck'ed before mounting.
systemd(1), systemd-nsresourced.service(8)
1. Discoverable Partitions Specification
https://uapi-group.org/specifications/specs/discoverable_partitions_specification/
2. Varlink
https://varlink.org/
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 257~devel SYSTEMD-....SERVICE(8)
Pages that refer to this page: systemd-nspawn(1), systemd.directives(7), systemd.index(7), systemd-nsresourced.service(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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