#!/bin/bash
#
# prepare-kernel.sh
#
# This is a script to pull the latest kernel image from kernelci.org, re-pack the
# kernelci modules into initramfs. It will also probe the module for the USB
# ethernet controller we use in the LAVA farm.
#
# Author:
#	Georgi Djakov <georgi.djakov@liaro.org>
#
# TODO:
# https://storage.kernelci.org/mainline/last-commit_mainline

set -e

if [ -z "$1" ]; then
	VER="v"
	VER+=$(wget -o /dev/null https://www.kernel.org/feeds/kdist.xml -O - | xml2 | grep -Eo  "title=.*mainline" | sed 's/.*=//' | cut -f 1 -d : | tr -d '\n')
else
	VER=$1
fi

echo "Downloading mainline kernel $VER from kernelci..."

wget -o /dev/null -O Image https://storage.kernelci.org/mainline/master/${VER}/arm64/defconfig/gcc-8/Image
wget -o /dev/null -O apq8016-sbc.dtb https://storage.kernelci.org/mainline/master/${VER}/arm64/defconfig/gcc-8/dtbs/qcom/apq8016-sbc.dtb
wget -o /dev/null -O modules.tar.xz https://storage.kernelci.org/mainline/master/${VER}/arm64/defconfig/gcc-8/modules.tar.xz
wget -o /dev/null -O rootfs.cpio.gz http://people.linaro.org/~georgi.djakov/rootfs.cpio.gz

echo "Creating initramfs with modules..."

TMPDIR=$(mktemp -d) || exit
cd $TMPDIR
xzcat $OLDPWD/modules.tar.xz | tar xf -

# The board has an Asix USB Ethernet controller used for WA
mkdir -p "etc/network"
cat << EOF > etc/network/interfaces
auto lo
iface lo inet loopback
allow-hotplug eth0
iface eth0 inet dhcp
EOF

mkdir -p "etc/init.d"
cat << EOF > etc/init.d/S30modules
/sbin/modprobe asix
sleep 10
ifconfig eth0 up
udhcpc -n -i eth0 -t 6
EOF
chmod +x etc/init.d/S30modules

find . | cpio -o -H newc --quiet | gzip -9 > $OLDPWD/modules.cpio.gz
cd "$OLDPWD"
rm -rf "$TMPDIR"

gzip -f Image
cat Image.gz apq8016-sbc.dtb > Image.gz+dtb
cat rootfs.cpio.gz modules.cpio.gz > ramdisk.img

#CMDLINE="root=/dev/disk/by-partlabel/rootfs rw rootwait console=tty0 console=ttyMSM0,115200n8"
CMDLINE="root=/dev/ram0 console=tty0 console=ttyMSM0,115200n8 earlycon ignore_loglevel"

echo "Creating boot.img..."

mkbootimg --kernel Image.gz+dtb \
	--pagesize 2048 --base 0x80000000 --kernel_offset 0x8000 --ramdisk_offset 0x1000000 --tags_offset 0x100 \
	--cmdline "${CMDLINE}" \
	--ramdisk ramdisk.img \
	--output boot.img
gzip -f boot.img

scp -q boot.img.gz people.linaro.org:./public_html/

echo "Done!"