Re: Systemd udev add tag for boot device

[Lennart Poettering <lennart@xxxxxxxxxxxxxx>]

eOn Fr, 06.12.19 14:35, Boyce, Kevin P [US] (AS) (Kevin.Boyce@xxxxxxx) wrote:

> Good Morning List,
>
> Does anyone know of a good way to use udev to set a TAG property on every partition of a disk  that was used to boot the system?
>
> In other words, I want a udev rule that adds a TAG to every
> partition on the same disk /boot was found on containing the running
> kernel and intiramfs.

On EFI systems with compliant GPT boot loaders
systemd-gpt-auto-generator implements something like that.

But in the general case: the information which boot device was used is
not available, unless the boot loader explicitly passes this
information somewhow.

We generally recommend that EFI boot loaders at least pass this
information via the LoaderDevicePartUUID EFI variable, see this spec
for details:

https://systemd.io/BOOT_LOADER_INTERFACE

For non-EFI there's no spec like this, since there's no generic way to
pass arbitrary data from boot loader to OS, sorry.

Lennart

--
Lennart Poettering, Berlin
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