Mounts

Mounts in Rind are mount definitions managed by the mounts runtime. A mount entry describes one mount target and optional source/fs parameters, and can be ordered with dependencies.

Core Definition

The core mount definition identifies where and what to mount.

• target: The mount target path (also the metadata key via meta_name = target).
• source (optional): Source device/fs name/path passed to mount(2).
• fstype (optional): Filesystem type passed to mount(2).

[[mount]]
source = "proc"
target = "/proc"
fstype = "proc"

Mount Flags and Data

Mount options are controlled through flags and data.

• flags (optional): List of string flags mapped to nix::mount::MsFlags.
• data (optional): Raw data/options string passed to mount(2).

Supported flag strings in current runtime:

• MS_RDONLY
• MS_NOSUID
• MS_NODEV
• MS_NOEXEC
• MS_RELATIME
• MS_BIND
• MS_REC
• MS_PRIVATE
• MS_SHARED
• MS_SLAVE
• MS_STRICTATIME
• MS_LAZYTIME

[[mount]]
source = "/srv/data"
target = "/data"
flags = ["MS_BIND", "MS_REC", "MS_RDONLY"]

Target Creation

create controls directory creation for target path before mount.

• create = true: Runtime calls create_dir_all(target) before mounting.
• create = false or unset: Runtime does not create target path.

[[mount]]
source = "tmpfs"
target = "/tmp"
fstype = "tmpfs"
create = true

Dependency Ordering

after delays mount until dependencies are mounted.

• after (optional): List of dependency mount IDs.
• Runtime mounts entries without after first, then resolves pending mounts when all dependencies are satisfied.
• Unresolved dependencies are logged as an error.

Dependency IDs are tracked as unit@target internally in mount_all ordering.

[[mount]]
source = "tmpfs"
target = "/run"
fstype = "tmpfs"
create = true
 
[[mount]]
source = "/run/rind"
target = "/var/run/rind"
flags = ["MS_BIND"]
after = ["init@/run"]

Runtime Actions

The mount runtime exposes these actions:

• mount: Mount one metadata entry by name.
• umount: Unmount one metadata entry by name.
• mount_all: Mount all unit mounts with dependency resolution.