format usb drive , install grub , add file.iso, run with qemu

create_multiboot_usb.sh

source /tmp/library.cfg
set -x
set -u
set -e
#trap exiting EXIT
drive=${1:-sdX}
partition=${drive}1
file_iso=$HOME/Downloads/XenServer-6.5.0-xenserver.org-install-cd2.iso
mode_cp=cp
filename_iso='xenserver.iso'
#file_iso=/boot/grub/$filename_iso


#If you use the wrong syntax, you will receive an error stating "Installation is impossible. Aborting"

if [ "$(id -u)" != "0" ]; then
    echo "Sorry, you are not root."
    exit 1
fi

exiting(){
$? || { lsof /mnt; }
}

fdisk1(){
    echo "
    d
    n
    p
    1


    a
    1
    t
    c
    w
    " | fdisk /dev/$drive
}

format1(){
    mkfs.vfat -F 32 -n MULTIBOOT /dev/$partition # (to format the partition as fat32)
}
umount1(){
    cd /tmp
    ( ls -l /mnt/USB ) && { sleep 1; umount /mnt/USB; }  || true
    #umount /dev/$partition
}
grub1(){
    #III. Install Grub2 on the USB Flash Drive:

    #Old versions of grub used 
    local args1='--root-directory=/mnt/USB'
    local args="--boot-directory=/mnt/USB/boot"
    grub-install --force --no-floppy $args /dev/$drive 
}
mnt1(){
    ( ls -l /mnt/USB  || {  mkdir -p /mnt/USB; } )
  mount /dev/$partition /mnt/USB 
}
cfg1(){

    cd /mnt/USB/boot/grub

    wget pendrivelinux.com/downloads/multibootlinux/grub.cfg #(to get the grub.cfg file)
    cat > grub2.cfg <<START
set timeout=10
set default=0
 
menuentry "$filename_iso" {
    loopback loop /boot/grub/$filename_iso
    linux (loop)/boot/bzImage --
    initrd (loop)/boot/tinycore.gz
}
START
 
}
wget1(){

    cd /mnt/USB/boot/grub
   

   (     test -f $filename_iso )  || { wget "distro.ibiblio.org/pub/linux/distributions/tinycorelinux/2.x/release/tinycore-current.iso" -O $filename_iso; }
}
cp1(){

    cd /mnt/USB/boot/grub
cp $file_iso $filename_iso
}
steps(){

    ( fdisk -l | grep /dev/$drive ) || { echo drive not found; exit; }

    ( fdisk -l | grep /dev/$partition ) && { umount1; } || true
    fdisk1
    format1
    mnt1
    grub1

if [ $mode_cp = "wget" ];then
    wget1
else
    cp1
fi

    cfg1
    umount1 && { qemu-system-x86_64 -hda /dev/$drive; }
}

steps