create-image

#!/bin/sh -e

if [ $# -gt 0 ]; then
	echo "usage: ./create-image"
	echo
	echo "ENVIRONMENT VARIABLES"
	echo "---------------------"
	echo "DEBIAN_MIRROR    URL for debian package repository"
	echo "                 default: http://ftp.debian.org/debian"
	echo "EV3DEV_MIRROR    URL for ev3dev package repository"
	echo "                 default: http://ppa.lechnology.com/ev3dev"
	echo "IMAGE_SIZE       Size(s) of image files to create"
	echo "                 default: 1G 2G 4G 8G"
	exit 0
fi

if [ ! -z $DEBIAN_MIRROR ]; then
	DEBIAN_MIRROR="-m $DEBIAN_MIRROR"
fi
if [ -z $IMAGE_SIZE ]; then
	IMAGE_SIZE="1G 2G 4G 8G"
fi

polystrap -d ev3dev-rootfs $DEBIAN_MIRROR ev3dev

# guestfish does not know how to set label for vfat!

guestfish -N bootroot:vfat:ext3:512M:48M:mbr \
set-label /dev/sda2 EV3_FILESYS : \
mount /dev/sda2 / : \
tar-in ev3dev-rootfs.tar.gz / compress:gzip : \
mkdir-p /media/mmc_p1 : \
mount /dev/sda1 /media/mmc_p1 : \
mv /uImage /media/mmc_p1/ : \
mv /uInitrd /media/mmc_p1/ : \
mv /boot.scr /media/mmc_p1/ : \
mv /ev3dev.rc.local /media/mmc_p1/

# Hack to set the volume label on the vfat partition since guestfish does not know how
# volume name must be null padded to exactly 11 bytes
echo -e "EV3_BOOT\0\0\0" | dd of=test1.img bs=1 seek=32811 count=11 conv=notrunc

for size in $IMAGE_SIZE
do
	truncate -r test1.img ev3dev.$size.img
	truncate -s $size ev3dev.$size.img
	virt-resize --expand /dev/sda2 test1.img ev3dev.$size.img
	zip -9 ev3dev.$size.img.zip ev3dev.$size.img
	cat ev3dev.$size.img | xz -9 > ev3dev.$size.img.xz
	rm -f ev3dev.$size.img
done