bugGNU GRUB - Bugs: bug #65152, Documentation on format of netboot...

 
 

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bug #65152: Documentation on format of netboot grub.cfg file name with MAC address is incorrect

Submitter:  Patrick Zingerle <zinga>
Submitted:  Fri 12 Jan 2024 02:02:17 PM UTC
   
 
Category:  Network Severity:  Major
Priority:  5 - Normal Item Group:  Documentation
Status:  None Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Open Release:  1.99
Release:  Reproducibility:  Every Time
Planned Release:  None

Fri 12 Jan 2024 02:02:17 PM UTC, original submission:  

Currently the documentation at https://www.gnu.org/software/grub/manual/grub/grub.html#Network says that the file name format of a grub.cfg to match a client machine via its MAC address is

‘(FWPATH)’/grub.cfg-‘(MAC ADDRESS OF NIC)’

with an example for

MAC:  52:54:00:ec:33:81

giving

‘(FWPATH)’/grub.cfg-52-54-00-ec-33-81

but using this file name pattern doesn't work in my setup (instead the default grub.cfg gets loaded).

When adding -01 before the MAC address, i.e. using the format

‘(FWPATH)’/grub.cfg-01-‘(MAC ADDRESS OF NIC)’

which would give

‘(FWPATH)’/grub.cfg-01-52-54-00-ec-33-81

in the example, then the machine specific config gets loaded for the corresponding MAC address/machine as expected.

A quick glance at the source code at https://git.savannah.gnu.org/cgit/grub.git/tree/grub-core/net/net.c#n1952 and the commit message of cb2f15c544895e1f3d540dd39d36c4611bdf5b7b stating

This procedure is similar to what is used by pxelinux...

(and pxelinux also uses a format 01-‘(MAC ADDRESS OF NIC)’) this hints to me that the documentation is incorrect.

 Patrick Zingerle <zinga>

 

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