mount.ddi

helper for Discoverable Disk Images

TLDR

Mount a Discoverable Disk Image

$ mount.ddi [path/to/image.raw] [/mnt/image]

Mount using standard mount command

$ mount -t ddi [path/to/image.raw] [/mnt/image]

Mount read-only

$ mount -t ddi -o ro [path/to/image.raw] [/mnt/image]

SYNOPSIS

mount.ddi image-file mount-directory [-o options]

mount.ddi is a mount helper for Discoverable Disk Images (DDIs). It implements the mount(8) external helper interface, allowing DDI images to be mounted using standard mount syntax.When systemd-dissect is symlinked to /sbin/mount.ddi, the system can mount DDI images directly through the mount command with -t ddi filesystem type. This enables automatic mounting at boot via /etc/fstab entries.DDI images follow the Discoverable Partitions Specification, allowing automatic partition identification and mounting without manual configuration.

PARAMETERS

Mount read-only

Mount read-write

discard

Enable block discarding

nodiscard

Disable block discarding

defaults

Use standard mount behavior

FSTAB EXAMPLE

$ /path/to/image.raw /images/myimage/ ddi defaults 0 0

INSTALL

sudo apt install systemd-container

sudo dnf install systemd-container

sudo zypper install systemd-container

CAVEATS

Requires systemd-dissect to be installed and symlinked to /sbin/mount.ddi. Use umount -R for recursive unmounting of nested filesystems within the image. The image must conform to the Discoverable Partitions Specification.

HISTORY

mount.ddi is part of systemd and provides integration between DDI disk images and the standard Unix mount infrastructure. It was developed to simplify mounting of OS images and portable service images.