shell script to make my backup bootable when converted to a virtualbox image

make_backup_vbox_bootable.sh

#!/bin/sh

mount /dev/sda1 /mnt
arch-chroot /mnt /usr/bin/rm /etc/vconsole.conf
arch-chroot /mnt /usr/bin/pacman -S --noconfirm syslinux
arch-chroot /mnt /usr/bin/syslinux-install_update -i -a -m
arch-chroot /mnt /usr/bin/sed -i.bak s/sda3/sda1/g /boot/syslinux/syslinux.cfg
rm /mnt/etc/fstab
echo "tmpfs	/tmp	tmpfs	nodev,nosuid	0	0" > /mnt/etc/fstab
echo "/dev/sda1	/	ext4	defaults,noatime	0	1" >> /mnt/etc/fstab
arch-chroot /mnt /usr/bin/pacman -R xf86-input-synaptics xf86-video-ati xf86-video-intel intel-ucode
arch-chroot /mnt /usr/bin/pacman -S --noconfirm virtualbox-guest-utils
arch-chroot /mnt /usr/bin/mkinitcpio -p linux

# todo: fix .xinitrc and maybe lower dpi in .Xresources 
echo "do not forget to manually fix .xinitrc after boot, before startx"