emupi

#!/bin/bash -e

basedir=$(cd $(dirname $0) && pwd)
tmpdir=$(mktemp -d)

qemubindir=/opt/qemu-rpi/bin

fdisk=/sbin/sfdisk

export PATH=$basedir:$qemubindir:$PATH

function _cleanup {
    mount | grep -q $tmpdir/boot && \
	umount $tmpdir/boot || true
    mount | grep -q $tmpdir && \
	umount $tmpdir || true
    rm -rf $tmpdir
}

function _usage {
    echo "Usage: $0 [-r] /path/to/image"
}

trap _cleanup EXIT

if test `id -u` != 0; then
    sudo $0 $*
    exit 0
fi

if test $# -lt 1; then
    _usage
    exit 1
fi

opts=""
while getopts ":r" opt; do
    case $opt in
	r)
	    opts="$opts init=/bin/bash"
	    shift $((OPTIND-1))
	    ;;
	h)
	    _usage
	    exit 0
	    ;;
	\?)
	    _usage
	    exit 1
	    ;;
    esac
done

image=$1
if test ! -e $image; then
    echo "E: unknown image file " $image
    exit 1
fi

rpimount $image $tmpdir

kernel=$tmpdir/boot/kernel.img

cowimg=$(basename $image .bin)_$(date +%F-%H-%M-%S).bin
qemu-img create -f qcow2 -o backing_file=$image $cowimg

# The magic: https://www.raspberrypi.org/forums/viewtopic.php?f=72&t=26561
qemu-system-arm \
    -kernel $kernel \
    -cpu arm1176 \
    -m 512 \
    -machine raspi \
    -serial stdio \
    -no-reboot \
    -append "rw dma.dmachans=0x7f35 bcm2708_fb.fbwidth=1024 bcm2708_fb.fbheight=768 bcm2708.boardrev=0xf bcm2708.serial=0xcad0eedf smsc95xx.macaddr=B8:27:EB:D0:EE:DF sdhci-bcm2708.emmc_clock_freq=100000000 vc_mem.mem_base=0x1c000000 vc_mem.mem_size=0x20000000 dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait $opts" \
    -usb -device usb-kbd -device usb-mouse \
    -snapshot -sd $cowimg