Modify CSR 1000v ISO to activate serial console instead of VGA

csr_iso_modify.sh

#!/bin/bash
#set -x

[[ ! "$1" =~ .*\.iso ]] && { echo ".iso file name needed"; exit; }

TEMP=$(mktemp -d)
PDIR=$(pwd)

if [[ "$1" =~ ^/ ]]; then
    SRC=$1
else
    SRC=$PDIR/$1
fi

pushd $TEMP
mkdir mnt && mkdir iso
sudo mount -o loop $SRC mnt
cp -a mnt/* iso
sed -i '/^default/s/0/1/' iso/boot/grub/menu.lst
mkisofs -R -b boot/grub/stage2_eltorito -no-emul-boot -boot-load-size 4 -boot-info-table -o "new-$(basename $1)" iso
sudo umount mnt
mv *.iso $PDIR
popd
rm -rf $TEMP