kern-compile

#!/bin/bash
DATE=$(date '+%Y%m%d%H%M')
PROG="${0##*/}"
ARGS="${*} default"
DO_RETURN=${SHLVL}

trap do_exit SIGINT SIGTERM SIGKILL SIGQUIT SIGABRT SIGSTOP SIGSEGV

do_exit()
{
        STATUS=${1:-0}
        REASON=${2}

        [[ -n "${REASON}" ]] && echo "${REASON}"

        [[ ${DO_RETURN} -eq 1 ]] && return $STATUS || exit $STATUS
}

cd /usr/src/

if [ ! -e /usr/src/linux-pine64/.git/config ]
then
	echo "no current linux repository, cloning may take some time."
	git clone --depth 1 --single-branch -b pine64-hacks-1.2 https://github.com/longsleep/linux-pine64
	ARGS="update"
fi

cd /usr/src/linux-pine64

if [ -z "${ARGS##*update*}" ]
then
	make mrproper
	git pull

	echo "ctrl-z, run 'git checkout -b \${branch}' here, then fg and 'enter' to continue."
	read waiting

else
	echo "skipping update ('$0 update' to force a new kernel) and starting to build"
fi

if [ ! -e ".config" ]
then
	echo "ctrl-z, and run either 'make sun50iw1p1smp_linux_defconfig' or copy a saved config here as .config, run 'make oldconfig', then fg and 'enter' to continue."
	read waiting
fi

test -e /usr/src/linux-pine64/arch/arm64/boot/dts/sun50i-a64-pine64-plus.dts || \
	curl -sSL https://github.com/longsleep/build-pine64-image/raw/master/blobs/pine64.dts > /usr/src/linux-pine64/arch/arm64/boot/dts/sun50i-a64-pine64-plus.dts

CPUS=$(grep processor /proc/cpuinfo | wc -l)
if [ -z "${ARGS##*CPUS=*}" ]
then
	CPUS=${ARGS##*CPUS=}
	CPUS=${CPUS[0]}
	CPUS=${CPUS//[^0-9]/}
fi

make -j${CPUS} Image sun50i-a64-pine64-plus.dtb modules

if [ 0 -ne $? ]
then
   echo "Make broke.  fix and resume manually"
   do_exit 1
fi

make modules_install
if [ 0 -ne $? ]
then
   echo "Make (modules_install) broke.  fix and resume manually"
   do_exit 1
fi
make firmware_install
if [ 0 -ne $? ]
then
   echo "Make (firmware_install) broke.  fix and resume manually"
   do_exit 1
fi

# this really doesn't need to be updated except for major revision changes.
# so... a difference of 100 in the kernel version, maybe?

if [ -e /usr/include/linux/version.h ]
then
	OLDV=$(grep LINUX_VERSION_CODE /usr/include/linux/version.h | awk '{print $3}')
	NEWV=$(grep LINUX_VERSION_CODE /usr/src/linux-pine64/include/generated/uapi/linux/version.h | awk '{print $3}')
	DIFF=$(( ${NEWV:-0} - ${OLDV:-0} ))
	#negatives mean older, but bash math, so normalize to zero.
	DIFF=${DIFF##-*}
	
	if [ ${NEWV:-0} -gt ${OLDV:-0}   -a   ${DIFF:-0} -gt 100 ]
	then
		make headers_install INSTALL_HDR_PATH=/usr
	fi
else
	# if there's no linux include directory, we install it forcefully
	make headers_install INSTALL_HDR_PATH=/usr
fi

kver=$( make kernelrelease )
kb=${kver//\./}
kb=${kb//-pine64}
kb="k0${kb//-/.}"

test -e .config && cp .config /usr/src/config-pine64-${kver}-${DATE}

# and install it...
if [ -z "$(mount | grep boot)" ]
then
	echo "/boot not mounted: ctrl-z, 'mount /boot', then fg and 'enter' to continue."
	read waiting
fi

mkdir /boot/${kb}
FREE=$(df -k /boot/ | awk '/boot/ {print $4}')
if [ ${FREE:-0} -lt 20000 ]
then
	echo "not enough free space in /boot: ctrl-z, clean up space, then fg and 'enter' to continue."
	read waiting
fi

cp arch/arm64/boot/dts/sun50i-a64-pine64-plus.dtb arch/arm64/boot/Image /boot/${kb}/
update-initramfs -c -k ${kver} -b /boot/${kb}/
mv /boot/${kb}/initrd.img-${kver} /boot/${kb}/initrd.img

##  adjust the /boot/uEnv.txt

if [ -e /boot/uEnv.txt ]
then
	echo "About to fixup /boot/uEnv.txt, enter to continue, or ctrl-c to abort this auto-updating"
	read waiting
fi

sed -i "s/\(kernel_filename\)=.*/\1=${kb}\/Image/gi; s/\(initrd_filename\)=.*/\1=${kb}\/initrd.img/gi;" /boot/uEnv.txt
if [ -z "$(grep fdt_filename_prefix /boot/uEnv.txt)" ]
then
	sed -i "s/\(fdt_filename_prefix\)=.*/\1=${kb}\/sun50i-a64-/gi;" /boot/uEnv.txt
else
	echo "fdt_filename_prefix=${kb}/sun50i-a64-" >> /boot/uEnv.txt
fi

echo "completed"