[Bug 1923268] Re: grubnet default grub.cfg should try /grub/grub.cfg-${net_default_mac} before /grub/grub.cfg

[Dimitri John Ledkov]

Note that upstream and all distro grubs have moved on to query for:

"""
This patch implements a search for a specific configuration when the config
file is on a remoteserver. It uses the following order:
   1) DHCP client UUID option.
   2) MAC address (in lower case hexadecimal with dash separators);
   3) IP (in upper case hexadecimal) or IPv6;
   4) The original grub.cfg file.
"""

Is that not sufficient in the future?

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https://bugs.launchpad.net/bugs/1923268

Title:
  grubnet default grub.cfg should try /grub/grub.cfg-${net_default_mac}
  before /grub/grub.cfg

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  MAAS uses the signed network GRUB bootloader when a machine network
  boots on AMD64 and ARM64. The configuration MAAS produces depends on
  the machine which are identified by MAC address. The default grub.cfg
  in the boot loader downloads /grub/grub.cfg from the remote host. As
  that doesn't provide the MAC address MAAS provides a default
  configuration file:

  configfile /grub/grub.cfg-${net_default_mac}
  configfile /grub/grub.cfg-default-amd64

  There are two issues with this:

  1. This causes an additional unnecessary request.
  2. It is assumed an known machine is amd64.

  Can the default grub.cfg embedded in grubnet<arch>.efi be updated to

  configfile /grub/grub.cfg-${net_default_mac}
  configfile /grub/grub.cfg-default-<ARCH>
  configfile /grub/grub.cfg

  This would be similar to what PXELinux[1] does.

  [1] https://wiki.syslinux.org/wiki/index.php?title=PXELINUX

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