-grub-menu.md

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#grub #boot #menu #efi

This is the conclusion part and latest code repo.

.gitignore

# nix
*~

grub-footer.cfg

## /etc/grub.d/41_custom
#if [ -f  ${config_directory}/custom.cfg ]; then
#  source ${config_directory}/custom.cfg
#elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
#  source $prefix/custom.cfg;
#fi


menuentry " ------------------------------------------------" {
  true
}

#
menuentry "UEFI Firmware Settings" {
  echo "UEFI Firmware Settings..."
  fwsetup
}

#
menuentry "System restart" {
  echo "System rebooting..."
  reboot
}


#
menuentry "System shutdown" {
  echo "System shutting down..."
  halt
}

play 6000 500 1 500 1 1500 1

grub-header.cfg

# == fundementals
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue

set timeout=3

# == loadfont
font=unicode
set locale_dir=$prefix/locale
set lang=en_US
# -- load_video
insmod gettext
insmod gfxterm
insmod all_video

# load common modules
  insmod gzio
  insmod part_gpt
  insmod ext2

grub-main.cfg

## grub2 configuration
source /boot/grub/grub-header.cfg

insmod regexp

for config in /boot/grub/*_default.cfg ; do source "$config" ; done
for config in /boot/grub/*_options.cfg ; do source "$config" ; done
if [ -f /boot/grub/grub-addons.cfg ] ; then
  source "/boot/grub/grub-addons.cfg"
fi

source /boot/grub/grub-footer.cfg

grub.cfg

source /boot/grub/grub-main.cfg

grub2clean.sed

/^submenu .Advanced options for /,/^}/d

/^menuentry /{ s/^/\n/; s/--\(class\|id\) .*$/{/ }

/load_video\|insmod/d

# remove entire if block
/feature_platform_search_hint/{ N; N; N; N; d; }

s/^\(        \|\t\)/  /

grub2yaml.sh

sed -En '
1{s/^.*$/OS:/; p}

/^submenu .Advanced options for /,/^}/d

# WinOS
/^menuentry .*Windows/{
s/^menuentry /\n - Name: /
s/ --(class|id) .*$/\n   Type: WinOS/
p
}

# LinOS
/^menuentry /{
s/^menuentry /\n - Name: /
s/ --(class|id) .*$/\n   Type: LinOS/
p
}

# Root
/set root=/{
s/^\s*set root=/   Root: /
p
}

' "$@"

grub_default.cfg

set default=0

iso-all.cfg

set iso_root=
export iso_root

source /boot/grub/iso-inc.cfg

iso-all2.cfg

set iso_root='(hd0,2)'
export iso_root

source /boot/grub/iso-inc.cfg

iso-all3.cfg

set iso_root='(hd0,3)'
export iso_root

source /boot/grub/iso-inc.cfg

iso-inc.cfg

submenu "Boot from ISO ... >" {

set menu_color_normal=black/light-gray
set menu_color_highlight=yellow/dark-gray

if [ x$iso_root != x ]; then set root=$iso_root; fi

insmod regexp

for isofile in /iso/*.iso; do

  regexp --set=isoname "/iso/(.*)" "$isofile"
  #export isoname

  bootoptions="noeject noprompt nomce net.ifnames=0"
  # more failsafe bootoptions
  # memtest noapic noapm nodma nolapic nomodeset nosmp nosplash vga=normal
  export bootoptions

  submenu "$isoname >" "$isofile" {
    set menu_color_normal=black/light-red
    set menu_color_highlight=yellow/light-red
    iso_path="$2"
    loopback loop "$iso_path"
    menuentry 'Live (ISO)' {
      #echo 'Boot ISO $isoname ...'
      echo 'Loading kernel...'
      linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$iso_path $bootoptions
      echo 'Loading initrd...'
      initrd (loop)/casper/initrd
      # == debian-live
      # linux (loop)/live/vmlinuz boot=live findiso=$iso_path components $bootoptions
      # initrd (loop)/live/initrd.img
      # == grml
      # echo 'Loading kernel...'
      # linux   /boot/grml64full/vmlinuz apm=power-off boot=live findiso=$iso_path ${kernelopts} live-media-path=/live/grml64-full/ $bootoptions bootid=20bcd9c7-ec57-49c4-9f58-2a90493229af
      # echo 'Loading initrd...'
      # initrd  /boot/grml64full/initrd.img
    }
  }
done
}

os0_default.cfg

menuentry 'Debian GNU/Linux' {
  set root='hd0,gpt2'
  probe -u $root --set=rootuuid
  echo  'Loading Linux ...'
  linux /vmlinuz root=UUID=$rootuuid ro text net.ifnames=0
  echo  'Loading initial ramdisk ...'
  initrd /initrd.img
}

os2grub-1.gold

menuentry 'Debian 11 bullseye' {
  set root='hd0,gpt2'
  probe -u $root --set=rootuuid
  echo 'Booting - Debian 11 bullseye'
  echo 'Loading Linux Kernel ...'
  linux /vmlinuz root=UUID=$rootuuid ro text net.ifnames=0
  echo 'Loading initial ramdisk ...'
  initrd /initrd.img
}

os2grub-1.tmpl

os2grub.tmpl

os2grub-1.yaml

OS:

 - # Name - Name of the boot entry
   Name: Debian 11 bullseye
   # Type - Type of the boot entry
   # Values can be LinOS, WinOS
   Type: LinOS
   # Root - Partition to set grub root with
   Root: hd0,gpt2
   # Disk - Optional, Disk label of the partition
   Disk: 

os2grub.gold

menuentry 'Ubuntu 20.04 LTS (20.04) (on /dev/sda3)' {
  set root='hd0,gpt3'
  probe -u $root --set=rootuuid
  echo 'Booting - Ubuntu 20.04 LTS (20.04) (on /dev/sda3)'
  echo 'Loading Linux Kernel ...'
  linux /boot/vmlinuz root=UUID=$rootuuid ro text net.ifnames=0 zswap.enabled=1 zswap.compressor=lz4 zswap.zpool=z3fold zswap.max_pool_percent=52
  echo 'Loading initial ramdisk ...'
  initrd /boot/initrd.img
}

menuentry 'Ubuntu 19.04 (19.04) (on /dev/sda7)' {
  set root='hd0,gpt7'
  probe -u $root --set=rootuuid
  echo 'Booting - Ubuntu 19.04 (19.04) (on /dev/sda7)'
  echo 'Loading Linux Kernel ...'
  linux /boot/vmlinuz root=UUID=$rootuuid ro text net.ifnames=0 zswap.enabled=1 zswap.compressor=lz4 zswap.zpool=z3fold zswap.max_pool_percent=52
  echo 'Loading initial ramdisk ...'
  initrd /boot/initrd.img
}

menuentry 'Ubuntu 18.04 LTS (18.04) (on /dev/sda6)' {
  set root='hd0,gpt6'
  probe -u $root --set=rootuuid
  echo 'Booting - Ubuntu 18.04 LTS (18.04) (on /dev/sda6)'
  echo 'Loading Linux Kernel ...'
  linux /boot/vmlinuz root=UUID=$rootuuid ro text net.ifnames=0 zswap.enabled=1 zswap.compressor=lz4 zswap.zpool=z3fold zswap.max_pool_percent=52
  echo 'Loading initial ramdisk ...'
  initrd /boot/initrd.img
}

menuentry 'Ubuntu 17.04 (17.04) (on /dev/sda8)' {
  set root='hd0,gpt8'
  probe -u $root --set=rootuuid
  echo 'Booting - Ubuntu 17.04 (17.04) (on /dev/sda8)'
  echo 'Loading Linux Kernel ...'
  linux /boot/vmlinuz root=UUID=$rootuuid ro text net.ifnames=0 zswap.enabled=1 zswap.compressor=lz4 zswap.zpool=z3fold zswap.max_pool_percent=52
  echo 'Loading initial ramdisk ...'
  initrd /boot/initrd.img
}

menuentry 'Windows Boot Manager (on /dev/sda13)' {
  set root='hd0,gpt13'
  echo 'Booting - Windows Boot Manager (on /dev/sda13)'
  chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

os2grub.tmpl

{{range .OS}}
{{if eq .Type "LinOS" -}}
menuentry '{{.Name}}' {
  set root='{{.Root}}'
  probe -u $root --set=rootuuid
  echo 'Booting - {{.Name}}'
  echo 'Loading Linux Kernel ...'
  linux /boot/vmlinuz root=UUID=$rootuuid ro text net.ifnames=0 zswap.enabled=1 zswap.compressor=lz4 zswap.zpool=z3fold zswap.max_pool_percent=52
  echo 'Loading initial ramdisk ...'
  initrd /boot/initrd.img
}{{else}}{{if eq .Type "WinOS" -}}
menuentry '{{.Name}}' {
  set root='{{.Root}}'
  echo 'Booting - {{.Name}}'
  chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}{{end}}{{end}}
{{end}}

os2grub.yaml

OS:

 - Name: 'Ubuntu 20.04 LTS (20.04) (on /dev/sda3)' 
   Type: LinOS
   Root: 'hd0,gpt3'

 - Name: 'Ubuntu 19.04 (19.04) (on /dev/sda7)' 
   Type: LinOS
   Root: 'hd0,gpt7'

 - Name: 'Ubuntu 18.04 LTS (18.04) (on /dev/sda6)' 
   Type: LinOS
   Root: 'hd0,gpt6'

 - Name: 'Ubuntu 17.04 (17.04) (on /dev/sda8)' 
   Type: LinOS
   Root: 'hd0,gpt8'

 - Name: 'Windows Boot Manager (on /dev/sda13)' 
   Type: WinOS
   Root: 'hd0,gpt13'

aa758ee (HEAD -> master, origin/master, origin/HEAD) - [#] finish os2grub.tmpl; add os2grub.gold that generated from it
78e9424 - [#] finish grub2yaml.sh; add os2grub.yaml that generated from it
17db906 Revert "- [#] the ways for perl or tcl"
801aa16 - [#] this way works for tcl but not sed
0853ad6 - [#] this way works for perl but not sed
78f6fc1 - [+] add grub2yaml.sh
aef18c3 - [#] rename os2grub -> os2grub-1
a63b791 - [+] add os2grub easygen support
627e7d5 - [+] add grub.cfg
df22db4 - [-] remove entire if block
586786b - [+] add all .cfg files, and a sample os _default
3fb2866 

Boot menu image, for blogging

Credit here.

better menu image, for blogging

from https://help.ubuntu.com/community/Grub2/Submenus