119 lines
3.1 KiB
Bash
Executable File
119 lines
3.1 KiB
Bash
Executable File
set -e
|
|
set -u
|
|
|
|
OUTDIR=/minimal-linux
|
|
KERNEL_REPO=git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
|
|
KERNEL_VERSION=v6.1.14
|
|
BUSYBOX_VERSION=1_33_1
|
|
|
|
#ARCH=arm64
|
|
#CROSS_COMPILE=aarch64-none-linux-gnu-
|
|
ARCH=x86_64
|
|
CROSS_COMPILE=
|
|
|
|
if [ $# -lt 1 ]
|
|
then
|
|
echo "Using default directory ${OUTDIR} for output"
|
|
else
|
|
OUTDIR=$1
|
|
echo "Using passed directory ${OUTDIR} for output"
|
|
fi
|
|
|
|
mkdir -p ${OUTDIR}
|
|
|
|
cd "$OUTDIR"
|
|
if [ ! -d "${OUTDIR}/linux-stable" ]; then
|
|
#Clone only if the repository does not exist.
|
|
echo "CLONING GIT LINUX STABLE VERSION ${KERNEL_VERSION} IN ${OUTDIR}"
|
|
git clone ${KERNEL_REPO} --depth 1 --single-branch --branch ${KERNEL_VERSION}
|
|
fi
|
|
if [ ! -e ${OUTDIR}/linux-stable/arch/${ARCH}/boot/Image ]; then
|
|
cd linux-stable
|
|
echo "Checking out version ${KERNEL_VERSION}"
|
|
git checkout ${KERNEL_VERSION}
|
|
# https://unix.stackexchange.com/questions/657882/how-do-i-cross-compile-the-linux-kernel
|
|
#make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" menuconfig
|
|
#make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" config
|
|
# use default config
|
|
make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" defconfig
|
|
make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE"
|
|
fi
|
|
|
|
echo "Adding the Image in outdir"
|
|
|
|
cp ${OUTDIR}/linux-stable/arch/x86/boot/bzImage ${OUTDIR}
|
|
|
|
echo "Creating the staging directory for the root filesystem"
|
|
cd "$OUTDIR"
|
|
if [ -d "${OUTDIR}/rootfs" ]
|
|
then
|
|
echo "Deleting rootfs directory at ${OUTDIR}/rootfs and starting over"
|
|
sudo rm -rf ${OUTDIR}/rootfs
|
|
fi
|
|
|
|
# TODO: Create necessary base directories
|
|
mkdir rootfs/
|
|
mkdir rootfs/bin
|
|
mkdir rootfs/dev
|
|
mkdir rootfs/etc
|
|
mkdir rootfs/home
|
|
mkdir rootfs/lib
|
|
mkdir rootfs/lib/modules
|
|
mkdir rootfs/lib64
|
|
mkdir rootfs/lib64/modules
|
|
mkdir rootfs/proc
|
|
mkdir rootfs/sys
|
|
mkdir rootfs/sbin
|
|
mkdir rootfs/tmp
|
|
mkdir rootfs/usr
|
|
mkdir rootfs/usr/lib
|
|
mkdir rootfs/usr/bin
|
|
mkdir rootfs/usr/sbin
|
|
mkdir rootfs/var
|
|
mkdir rootfs/var/log
|
|
|
|
cd "$OUTDIR"
|
|
if [ ! -d "${OUTDIR}/busybox" ]
|
|
then
|
|
git clone git://busybox.net/busybox.git
|
|
cd busybox
|
|
git checkout ${BUSYBOX_VERSION}
|
|
# TODO: Configure busybox
|
|
# https://busybox.net/FAQ.html#configure
|
|
make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" defconfig
|
|
else
|
|
cd busybox
|
|
fi
|
|
|
|
# TODO: Make and install busybox
|
|
make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE"
|
|
make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" CONFIG_PREFIX="${OUTDIR}/rootfs" install
|
|
cd ..
|
|
pwd
|
|
|
|
echo "Library dependencies"
|
|
${CROSS_COMPILE}readelf -a ${OUTDIR}/rootfs/bin/busybox | grep "program interpreter"
|
|
${CROSS_COMPILE}readelf -a ${OUTDIR}/rootfs/bin/busybox | grep "Shared library"
|
|
|
|
# TODO: Add library dependencies to rootfs
|
|
SYSROOT=$(${CROSS_COMPILE}gcc -print-sysroot)
|
|
echo "SYSROOT is : $SYSROOT"
|
|
cp -a ${SYSROOT}/lib64/ld-linux-x86-64.so.2 ${OUTDIR}/rootfs/lib
|
|
echo "cp 1 result $#"
|
|
cp -r ${SYSROOT}/lib64/ ${OUTDIR}/rootfs/lib64
|
|
echo "cp 2 result $#"
|
|
|
|
# TODO: Make device nodes
|
|
cd ${OUTDIR}/rootfs
|
|
sudo mknod -m 666 dev/null c 1 3
|
|
sudo mknod -m 600 dev/console c 5 1
|
|
ls -l dev
|
|
|
|
# TODO: Chown the root directory
|
|
cd "$OUTDIR/rootfs"
|
|
sudo chown -R root:root *
|
|
|
|
# TODO: Create initramfs.cpio.gz
|
|
find . | cpio -H newc -ov --owner root:root > ${OUTDIR}/initramfs.cpio
|
|
cd "$OUTDIR"
|
|
gzip -f initramfs.cpio |