systemd-gpt-auto-generator


SYNOPSIS
       /lib/systemd/system-generators/systemd-gpt-auto-generator

DESCRIPTION
       systemd-gpt-auto-generator is a unit generator that automatically
       discovers root, /home, /srv and swap partitions and creates mount and
       swap units for them, based on the partition type GUIDs of GUID
       partition tables (GPT). It implements the Discoverable Partitions
       Specification[1]. Note that this generator has no effect on non-GPT
       systems, or where the directories under the mount points are already
       non-empty. Also, on systems where the units are explicitly configured
       (for example, listed in fstab(5)), the units this generator creates are
       overridden, but additional automatic dependencies might be created.

       This generator will only look for root partitions on the same physical
       disk the EFI System Partition (ESP) is located on. It will only look
       for the other partitions on the same physical disk the root file system
       is located on. These partitions will not be searched on systems where
       the root file system is distributed on multiple disks, for example via
       btrfs RAID.

       systemd-gpt-auto-generator is useful for centralizing file system
       configuration in the partition table and making manual configuration in
       /etc/fstab or suchlike unnecessary.

       This generator looks for the partitions based on their partition type
       GUID. The following partition type GUIDs are identified:

       Table 1. Partition Type GUIDs
       +-------------------------------------+----------------+---------------------+
       |Partition Type GUID                  | Name           | Explanation         |
       +-------------------------------------+----------------+---------------------+
       |44479540-f297-41b2-9af7-d131d5f0458a | Root Partition | On 32-bit x86       |
       |                                     | (x86)          | systems, the first  |
       |                                     |                | x86 root partition  |
       |                                     |                | on the disk the EFI |
       |                                     |                | ESP is located on   |
       |                                     |                | is mounted to the   |
       |                                     |                | root directory /.   |
       +-------------------------------------+----------------+---------------------+
       |4f68bce3-e8cd-4db1-96e7-fbcaf984b709 | Root Partition | On 64-bit x86       |
       |                                     | (x86-64)       | systems, the first  |
       |                                     |                | x86-64 root         |
       |                                     |                | partition on the    |
       |                                     |                | disk the EFI ESP is |
       |                                     |                | located on is       |
       |                                     |                | mounted to the root |
       |                                     |                | directory /.        |
       +-------------------------------------+----------------+---------------------+
       |69dad710-2ce4-4e3c-b16c-21a1d49abed3 | Root Partition | On 32-bit ARM       |
       |                                     | (32-bit ARM)   | systems, the first  |
       |                                     |                | ARM root partition  |
       |                                     |                | on the disk the EFI |
       |933ac7e1-2eb4-4f13-b844-0e14e2aef915 | Home Partition | The first home      |
       |                                     |                | partition on the    |
       |                                     |                | disk the root       |
       |                                     |                | partition is        |
       |                                     |                | located on is       |
       |                                     |                | mounted to /home.   |
       +-------------------------------------+----------------+---------------------+
       |3b8f8425-20e0-4f3b-907f-1a25a76f98e8 | Server Data    | The first server    |
       |                                     | Partition      | data partition on   |
       |                                     |                | the disk the root   |
       |                                     |                | partition is        |
       |                                     |                | located on is       |
       |                                     |                | mounted to /srv.    |
       +-------------------------------------+----------------+---------------------+
       |0657fd6d-a4ab-43c4-84e5-0933c84b4f4f | Swap           | All swap partitions |
       |                                     |                | located on the disk |
       |                                     |                | the root partition  |
       |                                     |                | is located on are   |
       |                                     |                | enabled.            |
       +-------------------------------------+----------------+---------------------+

       The /home and /srv partitions may be encrypted in LUKS format. In this
       case, a device mapper device is set up under the names /dev/mapper/home
       and /dev/mapper/srv. Note that this might create conflicts if the same
       partition is listed in /etc/crypttab with a different device mapper
       device name.

       Mount and automount units for the EFI System Partition (ESP), mounting
       it to /boot, are generated on EFI systems where the boot loader
       communicates the used ESP to the operating system. Since this generator
       creates an automount unit, the mount will only be activated on-demand,
       when accessed. On systems where /boot is an explicitly configured mount
       (for example, listed in fstab(5)) or where the /boot mount point is
       non-empty, no mount units are generated.

       When using this generator in conjunction with btrfs file systems, make
       sure to set the correct default subvolumes on them, using btrfs
       subvolume set-default.

       systemd-gpt-auto-generator implements systemd.generator(7).

SEE ALSO
       systemd(1), systemd.mount(5), systemd.swap(5), systemd-fstab-
       generator(8), systemd-cryptsetup@.service(8), cryptsetup(8), fstab(5),
       btrfs(8)

NOTES
        1. Discoverable Partitions Specification
           http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/

systemd 229                                      SYSTEMD-GPT-AUTO-GENERATOR(8)
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