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

Previous CSR1000v releases had the console automatically on the serial port. Which helped to automate the installation of the CSR into a vagrant box using https://github.com/ios-xr/iosxrv-x64-vbox/blob/master/iosxe_iso2vbox.py. However, 16.06.01 has the console on the VGA screen which breaks the script... meh.

This little bash script takes the original ISO, unwraps it and then builds a new one with a modified Grub menu that has the serial console again as the default. Works for me...

Nice! I hit this issue myself and talked with the devs about why they weren't offering a "serial" version of the ISO like they do with other formats. I thought they were going to start doing that again, but looks like they haven't yet.. let me shake that tree again..

@rschmied - Where are you running this script from? Trying to get it to run on OS X and having some issues... curious whether you ran down the proper pre-reqs on OS X vs a Linux distro

@hpreston Ugh... apparently missed this. Some of this is Linux specific... especially mounting a loop file system. You could try to replace the mount with hdiutil mount $SRC. You'd still need the mkisofs which can be installed using MacPorts or Brew. The rest is pretty vanilla. The hdiutil will also mount into /Volumes... so there's some more tweaking needed.