Man page - systemd-mountfsd(8)

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SYSTEMD-MOUNTFSD.SERVICE(8) systemd-mountfsd.service SYSTEMD-MOUNTFSD.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(8)'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/
systemd 257.9