make_pxe.sh

#! /bin/bash
#
# Original at http://hempeldesigngroup.com/embedded/stories/debian-squeeze-pxe-netboot-for-virtualbox/
#
# -----------------------------------------------------------------------------
# makePxeInstaller.sh - Make a netbootable directory that has all the IDE
#                           and sata drivers needed for a VirtualBox install
#
# Works in the current directory
# -----------------------------------------------------------------------------

echo "Executing makePxeInstaller"

# Set up variables so that the script is easier to update

FWDEST=$PWD
#FWTMP=$HOME/tmp/d-i_firmware
FWTMP=/tmp/d-i_firmware
DEB_DISTS=http://httpredir.debian.org/debian/dists
DIST=jessie
ARCH=amd64
IMAGES=$DEB_DISTS/$DIST/main/installer-$ARCH/current/images
NETBOOT_TAR_GZ=$IMAGES/netboot/netboot.tar.gz
HD_INITRD_GZ=$IMAGES/hd-media/initrd.gz

# Comment these lines out if you do NOT want to clear out existing files

rm -rf $FWTMP/netboot
rm -rf $FWDEST/netboot

# -----------------------------------------------------------------------------
# Check if we already copied the installer, symlink if we have it

if [ -d $FWDEST/netboot ]; then
	echo "  symlinking the netboot directory..."
	#ln -sf $FWDEST/netboot $HOME/.VirtualBox/TFTP
	echo "Done"
	exit
fi

# -----------------------------------------------------------------------------
# Check if we already built the installer, copy and symlink if we have it

if [ -d $FWTMP/netboot ]; then
	echo "  Copying and symlinking the netboot directory..."
	cp -R $FWTMP/netboot $FWDEST
	#ln -sf $FWDEST/netboot $HOME/.VirtualBox/TFTP
	echo "Done"
	exit
fi

# -----------------------------------------------------------------------------
# Otherwise get ready to do a complete build
#
# Make a temp dir for the installer gz files and then go there

echo "  Making download directory..."
mkdir -p $FWTMP/download
cd       $FWTMP/download

# Check to see if the destination files already exist before downloading
# them

echo "  Downloading netboot.tar.gz if we don't have it already..."
[ -f  netboot.tar.gz ] || wget $NETBOOT_TAR_GZ

echo "  Downloading hdboot intrd.gz if we don't have it already..."
[ -f  initrd.gz      ] || wget $HD_INITRD_GZ

# Make a directory for the extracted netboot files and extract them

echo "  Extracting netboot.tar.gz..."
mkdir -p $FWTMP/netboot
cd       $FWTMP/netboot
pax -rz -f $FWTMP/download/netboot.tar.gz 

# Make a directory for the extracted intrd files and extract them

echo "  Extracting netboot initrd.gz..."
mkdir -p $FWTMP/initrd
cd       $FWTMP/initrd
pax -rz -f $FWTMP/netboot/debian-installer/$ARCH/initrd.gz

# Copy the missing ata and ide drivers from the hdboot image to the netboot image

echo "  Copying ide and ata drivers from hdboot initrd.gz..."
pax -rz -f $FWTMP/download/initrd.gz lib/modules/*/kernel/drivers/ata/*
#pax -rz -f $FWTMP/download/initrd.gz lib/modules/*/kernel/drivers/ide/*

# Find all the files in the netboot initrd directory and rebuild netboot initrd.gz

echo "  Rebuilding netboot initrd.gz..."
pax -wz -x sv4cpio -f $FWTMP/netboot/debian-installer/$ARCH/initrd.gz .

# Remove the initrd directory - no longer needed

echo "  Cleaning up the initrd dircetory..."
cd     $FWTMP
rm -r  $FWTMP/initrd

# Copy the results to the where we ran the script from

echo "  Copying and symlinking the netboot dircetory..."
cp -R $FWTMP/netboot $FWDEST
#ln -sf $FWDEST/netboot $HOME/.VirtualBox/TFTP

echo "Done"