build-debian-installer-module

#!/bin/bash -e
if [ $# -lt 2 ]; then
	echo "Usage: ./build-debian-installer-module </path/to/filename.iso> http://<debianmirror>/debian/dists/<codename>/main/installer-<arch>/<version>/images"
	exit 1
fi

rm -rf build/debian
mkdir -p build/debian
mount $1 build/mnt -o ro,loop
VMLINUZ_NAME=$(grep vmlinuz build/mnt/boot/grub/grub.cfg | awk '{print $2}' | head -n 1)
FOLDER_NAME=${VMLINUZ_NAME%/vmlinuz}

wget -P build/debian "$2/cdrom/vmlinuz"

if ! cmp -s build/debian/vmlinuz build/mnt$VMLINUZ_NAME; then
	echo 'Error: VMLINUZ differs on the iso - did you specify the correct debian installer version?'
	umount build/mnt
	exit 1
fi

rm build/debian/vmlinuz
wget -P build/debian "$2/hd-media/gtk/initrd.gz"
mv build/debian/initrd.gz build/debian/gtk_initrd.gz
wget -P build/debian "$2/hd-media/initrd.gz"

touch build/debian/q.gz

sed '0,/theme/d' build/mnt/boot/grub/grub.cfg | \
	sed "s#${FOLDER_NAME}/vmlinuz#${FOLDER_NAME}/vmlinuz iso-scan/filename=\${iso_path} iso-scan/ask_second_pass=true#" | \
	sed "s#${FOLDER_NAME}/gtk/vmlinuz#${FOLDER_NAME}/gtk/vmlinuz iso-scan/filename=\${iso_path} iso-scan/ask_second_pass=true#" | \
	sed "s#${FOLDER_NAME}/gtk/initrd.gz#(mod)/gtk_initrd.gz#" | \
	sed "s#${FOLDER_NAME}/initrd.gz#(mod)/initrd.gz#" >build/debian/debian.cfg

printf 'LABEL=%q\n' "$(cat build/mnt/.disk/info)" >$1.module.tar.ini
umount build/mnt

cat >build/debian/grub.cfg <<EOF
	set orig_root="\$root"
	regexp -s 1:iso_path '^(.*)\\.module\\.tar\$' "\$MODULE_PATH"
	export iso_path
	loopback deb "\$iso_path"
	set root=(deb)
	configfile (mod)/debian.cfg
	loopback -d deb
	set root="\$orig_root"
EOF

cd build/debian
tar cf debian.tar *.cfg *.gz
cd ../..
mv build/debian/debian.tar $1.module.tar
echo "Module build finished."