build-iso

#!/bin/sh

set -e

. "$(dirname "$0")/config.sh"

ORIG="work/ubuntu-$VERSION-$DISTRO-$ARCH.iso"
COPY="work/ubuntu-$VERSION-$DISTRO-$ARCH"
ISO="work/$NICKNAME-ubuntu-$VERSION-$DISTRO-$ARCH.iso"
MOUNT="work/mount"
PLATFORM=$(uname)

# Download the original ISO if it isn't present already.
[ -f "$ORIG" ] || curl -L -o "$ORIG" \
	"http://releases.ubuntu.com/$VERSION/ubuntu-$VERSION-$DISTRO-$ARCH.iso"

rm -rf "$MOUNT"
mkdir "$MOUNT"

echo Mounting ISO
# Make a writable copy of the original ISO.
if [ "$PLATFORM" = "Darwin" ]; then
	# os x
	DEVNODE=$(sudo hdiutil attach -nomount "$ORIG" | head -1 | awk "{print \$1}")
	sudo mount -t cd9660 "$DEVNODE" "$MOUNT"
else
	# linux
	sudo mount -o loop "$ORIG" "$MOUNT"
fi

echo Syncing files from ISO
rsync -a "$MOUNT/" "$COPY"

echo Unmounting ISO
sudo umount "$MOUNT"
if [ "$PLATFORM" = "Darwin" ]; then
	sudo hdiutil eject "$DEVNODE"
fi
rm -rf "$MOUNT"
chmod -R +w "$COPY"

echo Injecting custom configs
# Customize the writable copy.
cp "isolinux.cfg" "$COPY/isolinux/"
m4 \
	-D __HOST__="$HOST" \
	-D __DOMAIN__="$DOMAIN" \
	-D __KERNEL__="linux-$([ "$ARCH" = "i386" ] \
		&& echo generic-pae \
		|| echo server
	)" \
	-D __ROOT_PASSWORD__="$ROOT_PASSWORD" \
	-D __USERNAME__="$USERNAME" \
	-D __PASSWORD__="$PASSWORD" \
	"unattended.seed.m4" > "$COPY/preseed/unattended.seed"
m4 \
	-D __USERNAME__="$USERNAME" \
	sudoers.m4 > "$COPY/sudoers"
cp "$PUBLIC_KEY" "auto_resize_vda.sh" "$COPY/"
m4 \
	-D __USERNAME__="$USERNAME" \
	-D __PUBLIC_KEY__="$PUBLIC_KEY" \
	"late_command.sh.m4" > "$COPY/late_command.sh"

echo Building a custom ISO
# Build a custom ISO.
mkisofs -r -V "Ubuntu $VERSION for Terraform" \
	-cache-inodes -J -l -no-emul-boot \
	-b isolinux/isolinux.bin \
	-c isolinux/boot.cat \
	-boot-load-size 4 -boot-info-table \
	-o "$ISO" "$COPY"

echo Built "$ISO"