Cobbler post-sync trigger script to generate GRUB2 per-client configurations

uefi.sh

#!/bin/bash
# Write configs for UEFI boot from Cobbler, see:
# http://sapitnotes.com/cobbler-загрузка-по-pxe-в-режиме-uefi-centos-7/
# Translation:
# https://translate.google.com/translate?hl=en&sl=ru&u=http://sapitnotes.com/cobbler-%25D0%25B7%25D0%25B0%25D0%25B3%25D1%2580%25D1%2583%25D0%25B7%25D0%25BA%25D0%25B0-%25D0%25BF%25D0%25BE-pxe-%25D0%25B2-%25D1%2580%25D0%25B5%25D0%25B6%25D0%25B8%25D0%25BC%25D0%25B5-uefi-centos-7/&prev=search
# Adaptations by ajr, 2019-06
# Make executable and place in /var/lib/cobbler/triggers/sync/post/uefi.sh
# or equivalent for your Cobbler installation

for o_name in $(ls -A1 /var/lib/tftpboot/grub/ | grep -E '(.{2}-){6}.{2}');
do
  n_name=grub.cfg-$(echo ${o_name} | tr '[A-Z]' '[a-z]');
  ## GRUB-legacy configs, skip:
  #cp -a /var/lib/tftpboot/grub/${o_name} /var/lib/tftpboot/uefi/${n_name};
  # fudge a GRUB2 config instead (experimental!), sisar1:
  cat > /var/lib/tftpboot/uefi/${n_name} << _EOF
set default="0"
set timeout=5

function load_video {
  insmod efi_gop
  insmod efi_uga
  insmod video_bochs
  insmod video_cirrus
  insmod all_video
}
load_video
set gfxpayload=keep
insmod net
insmod efinet
insmod tftp
insmod gzio
insmod part_gpt
insmod ext2

_EOF
  # grep menu entry from GRUB1 config:
  awk '/^title/ {printf("menuentry \"%s\" {\n",$2)}' /var/lib/tftpboot/grub/${o_name} >> /var/lib/tftpboot/uefi/${n_name}
  awk '/kernel / {printf("  linuxefi %s\n",(substr($0, index($0,$2))))}' /var/lib/tftpboot/grub/${o_name} >> /var/lib/tftpboot/uefi/${n_name}
  awk '/initrd / {printf("  initrdefi %s\n",(substr($0, index($0,$2))))}' /var/lib/tftpboot/grub/${o_name} >> /var/lib/tftpboot/uefi/${n_name}
  echo '}' >> /var/lib/tftpboot/uefi/${n_name}
 
  # create compatible links for GRUB include (remove leading -01 and change
  # MAC addresses to standard form):
  l_name=$(echo $n_name | sed -e 's/\-/\:/g' -e 's/:01:/\-/')
  rm -f /var/lib/tftpboot/uefi/${l_name}
  ln -s ${n_name} /var/lib/tftpboot/uefi/${l_name}
done 

# write default grub.cfg:
cat > /var/lib/tftpboot/grub/grub.cfg << _EOgrub
configfile=uefi/grub.cfg-\$net_default_mac
source "\$configfile"
_EOgrub