[Bug 1981378] [NEW] grub-netboot.cfg does not load $prefix/$platform/grub.cfg

[Michael Hudson-Doyle]

Public bug reported:

grub-netboot.cfg (the config that is embedded in grubnetx64.efi /
grubnetaa64.efi looks like this:

cat >"$workdir/grub-netboot.cfg" <<EOF
if [ -e \$prefix/$platform/grub.cfg ]; then
	source \$prefix/$platform/grub.cfg
else
	source \$prefix/grub.cfg
fi
EOF

This looks like the intent is to load e.g. grub/x86_64-efi/grub.cfg off
your tftp or http server if it exists and if not fall back to
grub/grub.cfg. But this doesn't work: -e never returns true for a
network path afaict and so grub always tries to load grub/grub.cfg
instead.

I first thought that this was expected / by design but on reading the
patches we carry to grub I'm not completely sure and maybe this is a bug
in grub rather than a pointer that writing the config like this is
pointless. But the config definitely doesn't work as expected.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1981378

Title:
  grub-netboot.cfg does not load $prefix/$platform/grub.cfg

Status in grub2 package in Ubuntu:
  New

Bug description:
  grub-netboot.cfg (the config that is embedded in grubnetx64.efi /
  grubnetaa64.efi looks like this:

  cat >"$workdir/grub-netboot.cfg" <<EOF
  if [ -e \$prefix/$platform/grub.cfg ]; then
  	source \$prefix/$platform/grub.cfg
  else
  	source \$prefix/grub.cfg
  fi
  EOF

  This looks like the intent is to load e.g. grub/x86_64-efi/grub.cfg
  off your tftp or http server if it exists and if not fall back to
  grub/grub.cfg. But this doesn't work: -e never returns true for a
  network path afaict and so grub always tries to load grub/grub.cfg
  instead.

  I first thought that this was expected / by design but on reading the
  patches we carry to grub I'm not completely sure and maybe this is a
  bug in grub rather than a pointer that writing the config like this is
  pointless. But the config definitely doesn't work as expected.

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