build_on_krunvm.sh

#!/bin/sh

# This is a helper script for building the Linux kernel on macOS using
# a lightweight VM with krunvm.

KRUNVM=`which krunvm`
if [ -z "$KRUNVM" ]; then
	echo "Couldn't find krunvm binary"
	exit -1
fi

SCRIPTPATH=`realpath $0`
WORKDIR=`dirname $SCRIPTPATH`
krunvm create fedora --name libkrunfw-builder --cpus 2 --mem 2048 -v $WORKDIR:/work -w /work
if [ $? != 0 ]; then
	echo "Error creating lightweight VM"
	exit -1
fi

krunvm start libkrunfw-builder /usr/bin/dnf -- install -y make gcc glibc-devel findutils xz patch flex bison diffutils bc perl cpio
if [ $? != 0 ]; then
	echo "Error running command on VM"
	krunvm delete libkrunfw-builder
	exit -1
fi

krunvm start libkrunfw-builder /usr/bin/make -- -j2
if [ $? != 0 ]; then
	echo "Error running command on VM"
	krunvm delete libkrunfw-builder
	exit -1
fi

krunvm delete libkrunfw-builder

if [ ! -e "kernel.c" ]; then
	echo "There was a problem building the kernel bundle in the VM"
	exit -1
fi

gcc -fPIC -shared -o libkrunfw.dylib kernel.c

exit 0