systemd-gpt-auto-generator − Generator for automatically discovering and mounting root, /home and /srv partitions, as well as discovering and enabling swap partitions, based on GPT partition type GUIDs.
/usr/lib/systemd/system−generators/systemd−gpt−auto−generator
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, on systems where the units are explicitly configured (for example, listed in fstab(5)), or where the mount points are non−empty.
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
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.
Also note that systemd-efi-boot-generator(8) will mount the EFI System Partition (ESP) to /boot if not otherwise mounted.
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).
systemd(1), systemd.mount(5), systemd.swap(5), systemd-fstab-generator(8), systemd-efi-boot-generator(8), systemd-cryptsetup@.service(8), cryptsetup(8), fstab(5), btrfs(8)
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1. |
Discoverable Partitions Specification |
http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/