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

[Lee Trager]

When you added the ARM64 machine are you including the boot MAC address
or just the IPMI credentials? When you add just the IPMI credentials the
machine actually goes into enlistment but MAAS detects its a known
machine based on IPMI credenitals when the BMC is detected.

The associated branch updates the default grub.cfg file which is stored
with all boot images. These files only get updated when a new image is
found on images.maas.io or whatever your mirror is. To force the update
you can run

sudo rm -rf /var/lib/maas/boot-resources/*
sudo systemctl restart maas-rackd

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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 MAAS:
  Fix Committed
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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