файлы определения разделов для автоматического переразметки при загрузке (Partition Definition Files for Automatic Boot-Time Repartitioning)
Описание (Description)
repart.d/*.conf files describe basic properties of partitions of
block devices of the local system. They may be used to declare
types, names and sizes of partitions that shall exist. The
systemd-repart(8) service reads these files and attempts to add
new partitions currently missing and enlarge existing partitions
according to these definitions. Operation is generally
incremental, i.e. when applied, what exists already is left
intact, and partitions are never shrunk, moved or deleted.
These definition files are useful for implementing operating
system images that are prepared and delivered with minimally
sized images (for example lacking any state or swap partitions),
and which on first boot automatically take possession of any
remaining disk space following a few basic rules.
Currently, support for partition definition files is only
implemented for GPT partitition tables.
Partition files are generally matched against any partitions
already existing on disk in a simple algorithm: the partition
files are sorted by their filename (ignoring the directory
prefix), and then compared in order against existing partitions
matching the same partition type UUID. Specifically, the first
existing partition with a specific partition type UUID is
assigned the first definition file with the same partition type
UUID, and the second existing partition with a specific type UUID
the second partition file with the same type UUID, and so on. Any
left-over partition files that have no matching existing
partition are assumed to define new partition that shall be
created. Such partitions are appended to the end of the partition
table, in the order defined by their names utilizing the first
partition slot greater than the highest slot number currently in
use. Any existing partitions that have no matching partition file
are left as they are.
Note that these definitions may only be used to create and
initialize new partitions or to grow existing ones. In the latter
case it will not grow the contained files systems however;
separate mechanisms, such as systemd-growfs(8) may be used to
grow the file systems inside of these partitions. Partitions may
also be marked for automatic growing via the GrowFileSystem=
setting, in which case the file system is grown on first mount by
tools that respect this flag. See below for details.
