The GPT partition type UUID to match. This may be a GPT partition type UUID such as 4f68bce3-e8cd-4db1-96e7-fbcaf984b709, or one of the following special identifiers:

This setting defaults to linux-generic.

Most of the partition type UUIDs listed above are defined in the Discoverable Partitions Specification.

The textual label to assign to the partition if none is assigned yet. Note that this setting is not used for matching. It is also not used when a label is already set for an existing partition. It is thus only used when a partition is newly created or when an existing one had a no label set (that is: an empty label). If not specified a label derived from the partition type is automatically used. Simple specifier expansion is supported, see below.

The UUID to assign to the partition if none is assigned yet. Note that this setting is not used for matching. It is also not used when a UUID is already set for an existing partition. It is thus only used when a partition is newly created or when an existing one had a all-zero UUID set. If not specified a UUID derived from the partition type is automatically used.

A numeric priority to assign to this partition, in the range -2147483648…2147483647, with smaller values indicating higher priority, and higher values indicating smaller priority. This priority is used in case the configured size constraints on the defined partitions do not permit fitting all partitions onto the available disk space. If the partitions do not fit, the highest numeric partition priority of all defined partitions is determined, and all defined partitions with this priority are removed from the list of new partitions to create (which may be multiple, if the same priority is used for multiple partitions). The fitting algorithm is then tried again. If the partitions still do not fit, the now highest numeric partition priority is determined, and the matching partitions removed too, and so on. Partitions of a priority of 0 or lower are never removed. If all partitions with a priority above 0 are removed and the partitions still do not fit on the device the operation fails. Note that this priority has no effect on ordering partitions, for that use the alphabetical order of the filenames of the partition definition files. Defaults to 0.

A numeric weight to assign to this partition in the range 0…1000000. Available disk space is assigned the defined partitions according to their relative weights (subject to the size constraints configured with SizeMinBytes=, SizeMaxBytes=), so that a partition with weight 2000 gets double the space as one with weight 1000, and a partition with weight 333 a third of that. Defaults to 1000.

The Weight= setting is used to distribute available disk space in an "elastic" fashion, based on the disk size and existing partitions. If a partition shall have a fixed size use both SizeMinBytes= and SizeMaxBytes= with the same value in order to fixate the size to one value, in which case the weight has no effect.

Similar to Weight= but sets a weight for the free space after the partition (the "padding"). When distributing available space the weights of all partitions and all defined padding is summed, and then each partition and padding gets the fraction defined by its weight. Defaults to 0, i.e. by default no padding is applied.

Padding is useful if empty space shall be left for later additions or a safety margin at the end of the device or between partitions.

Specifies minimum and maximum size constraints in bytes. Takes the usual K, M, G, T, … suffixes (to the base of 1024). If SizeMinBytes= is specified the partition is created at or grown to at least the specified size. If SizeMaxBytes= is specified the partition is created at or grown to at most the specified size. The precise size is determined through the weight value value configured with Weight=, see above. When SizeMinBytes= is set equal to SizeMaxBytes= the configured weight has no effect as the partition is explicitly sized to the specified fixed value. Note that partitions are never created smaller than 4096 bytes, and since partitions are never shrunk the previous size of the partition (in case the partition already exists) is also enforced as lower bound for the new size. The values should be specified as multiples of 4096 bytes, and are rounded upwards (in case of SizeMinBytes=) or downwards (in case of SizeMaxBytes=) otherwise. If the backing device does not provide enough space to fulfill the constraints placing the partition will fail. For partitions that shall be created, depending on the setting of Priority= (see above) the partition might be dropped and the placing algorithm restarted. By default a minimum size constraint of 10M and no maximum size constraint is set.

Specifies minimum and maximum size constraints in bytes for the free space after the partition (the "padding"). Semantics are similar to SizeMinBytes= and SizeMaxBytes=, except that unlike partition sizes free space can be shrunk and can be as small as zero. By default no size constraints on padding are set, so that only PaddingWeight= determines the size of the padding applied.

Takes a path to a regular file, block device node or directory. If specified and the partition is newly created the data from the specified path is written to the newly created partition, on the block level. If a directory is specified the backing block device of the file system the directory is on is determined and the data read directly from that. This option is useful to efficiently replicate existing file systems on the block level on a new partition, for example to build a simple OS installer or OS image builder.

The file specified here must have a size that is a multiple of the basic block size 512 and not be empty. If this option is used, the size allocation algorithm is slightly altered: the partition is created as least as big as required to fit the data in, i.e. the data size is an additional minimum size value taken into consideration for the allocation algorithm, similar to and in addition to the SizeMin= value configured above.

This option has no effect if the partition it is declared for already exists, i.e. existing data is never overwritten. Note that the data is copied in before the partition table is updated, i.e. before the partition actually is persistently created. This provides robustness: it is guaranteed that the partition either doesn't exist or exists fully populated; it is not possible that the partition exists but is not or only partially populated.

This option cannot be combined with Format= or CopyFiles=.

Takes a file system name, such as "ext4", "btrfs", "xfs" or "vfat", or the special value "swap". If specified and the partition is newly created it is formatted with the specified file system (or as swap device). The file system UUID and label are automatically derived from the partition UUID and label. If this option is used, the size allocation algorithm is slightly altered: the partition is created as least as big as required for the minimal file system of the specified type (or 4KiB if the minimal size is not known).

This option has no effect if the partition already exists.

Similar to the behaviour of CopyBlocks= the file system is formatted before the partition is created, ensuring that the partition only ever exists with a fully initialized file system.

This option cannot be combined with CopyBlocks=.

Takes a pair of colon separated absolute file system paths. The first path refers to a source file or directory on the host, the second path refers to a target in the file system of the newly created partition and formatted file system. This setting may be used to copy files or directories from the host into the file system that is created due to the Format= option. If CopyFiles= is used without Format= specified explicitly, "Format=" with a suitable default is implied (currently "ext4", but this may change in the future). This option may be used multiple times to copy multiple files or directories from host into the newly formatted file system. The colon and second path may be omitted in which case the source path is also used as the target path (relative to the root of the newly created file system). If the source path refers to a directory it is copied recursively.

This option has no effect if the partition already exists: it cannot be used to copy additional files into an existing partition, it may only be used to populate a file system created anew.

The copy operation is executed before the file system is registered in the partition table, thus ensuring that a file system populated this way only ever exists fully initialized.

This option cannot be combined with CopyBlocks=.

Takes a boolean parameter, defaulting to false. If true the partition will be formatted with a LUKS2 superblock, before the blocks configured with CopyBlocks= are copied in or the file system configured with Format= is created.

The LUKS2 UUID is automatically derived from the partition UUID in a stable fashion. A single key is added to the LUKS2 superblock, configurable with the --key-file= switch to systemd-repart.

When used this slightly alters the size allocation logic as the implicit, minimal size limits of Format= and CopyBlocks= are increased by the space necessary for the LUKS2 superblock (see above).

This option has no effect if the partition already exists.

Takes a boolean argument. If specified the partition is marked for removal during a factory reset operation. This functionality is useful to implement schemes where images can be reset into their original state by removing partitions and creating them anew. Defaults to off.