Shell script that automates the process of extracting and modifying contents of ESXi ISO for install via PXE boot. See http://www.vcritical.com/2014/03/automatically-prepare-an-esxi-iso-image-for-pxe-booting/

esxiso2pxe

#!/bin/bash

# esxiso2pxe - quickly extract contents of ESXi ISO image for use on a PXE server
# 17Mar2014 - egray

if [ $# != 3 ]; then
        echo "Usage: $0 <tftpboot dir> <new dir name> <ESXi ISO file>" >&2
        exit 1
fi

tftpbootdir=$1
newdir=$2
newiso=$3
tmpesxi=`mktemp -d`

if [ ! -d $tftpbootdir ]; then echo "Error: $tftpbootdir not found." ; exit 1 ; fi
if [ -d $tftpbootdir/$newdir ]; then echo "Error: $tftpbootdir/$newdir already exists!" ; exit 1 ; fi
if [ ! -r $newiso ]; then echo "Error: $newiso not found or not readable!" ; exit 1 ; fi

mkdir -v $tftpbootdir/$newdir
mount -o loop $newiso $tmpesxi/
rsync -av $tmpesxi/ $tftpbootdir/$newdir/
sync && umount $tmpesxi && rmdir -v $tmpesxi

chmod +w $tftpbootdir/$newdir/*
sed -e "s#/##g" -e "3s#^#prefix=/$newdir/\n#" -i.bak $tftpbootdir/$newdir/boot.cfg

echo "Use the following for PXE menu:"
cat <<HERE | tee -a $tftpbootdir/esxi-submenu
LABEL $newdir
  KERNEL /$newdir/mboot.c32
  APPEND -c /$newdir/boot.cfg
  MENU LABEL ESXi $newdir - `basename $newiso` `date +%D`

HERE