#!/bin/bash

#DESC Make RH8 RTI install media.

#Ask for usb device name.
echo -n "Enter device name of usb stick. ex:sdb : "
read DEVICE
echo -n "This will wipe /dev/$DEVICE and create an RTI staging device. Are you sure? (y/n): "
read ANSWER
[ "$ANSWER" != "y" ] && exit 0

echo "Creating RTI staging media on /dev/$DEVICE." | tee -o /tmp/updateos.log
#Wipe usb stick.
dd bs=512 if=/dev/zero seek=0 count=2048 of=/dev/$DEVICE
dd bs=512 if=/dev/zero seek=15767552 count=2048 of=/dev/$DEVICE

#Create GPT partition table.
sfdisk --no-reread /dev/$DEVICE <<EOF
label: gpt
unit: sectors
sector-size: 512
1 : start=2048, size=15699968, type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, name="multiboot"
2 : start=15702016, size=65536, type=uefi, name="multiboot_EFI"
3 : start=15767552, size=2015, type=21686148-6449-6E6F-744E-656564454649, name="multiboot_BIOS"
EOF

sfdisk --no-reread -Y dos /dev/$DEVICE <<EOF
label: dos
sector-size: 512
1 : start=2048, size=15699968, type=0c, bootable
2 : start=15702016, size=65536, type=ef
3 : start=1, size=2047, type=ee
EOF

#Create filesystems.
mkdosfs -n MULTIBOOT /dev/$DEVICE1
mkdosfs /dev/$DEVICE2

#Mount the partitions and install grub twice. (EFI64 and Legacy)
pmount /dev/$DEVICE1 /media/boot
mkdir /media/boot/boot
pmount /dev/$DEVICE2 /media/efi

grub-install --target=x86_64-efi --removable --no-nvram \
  --root-directory=/media/boot \
  --boot-directory=/media/boot/boot \
  --efi-directory=/media/efi

grub-install --target=i386-pc \
  --root-directory=/media/boot \
  --boot-directory=/media/boot/boot \
  /dev/$DEVICE

pumount /media/efi

cat > /media/boot/boot/grub/grub.cfg <<EOF
set default="1"

function load_video {
  insmod efi_gop
  insmod efi_uga
  insmod video_bochs
  insmod video_cirrus
  insmod all_video
}

load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod ext2

set timeout=60
### END /etc/grub.d/00_header ###

search --no-floppy --set=root -l 'RHEL-8.5 Server.x86_64'

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Install RTI 16.1.5' --class fedora --class gnu-linux --class gnu --class os {
	linuxefi /images/pxeboot/vmlinuz inst.ks=http://rhel8repo.centralus.cloudapp.azure.com/ostools-1.17/RH8-RTI-silent.ks inst.stage2=http://rhel8repo.centralus.cloudapp.azure.com/rhel-8-for-x86_64-baseos-rpms nomodeset biosdevname=0 net.ifnames=0 video=640x480
	initrdefi /images/pxeboot/initrd.img
}
EOF