149 lines
4.4 KiB
Bash
Executable File
149 lines
4.4 KiB
Bash
Executable File
#!/bin/bash
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# Script create the simplest linux distro ever
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set -e
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set -u
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OUTDIR=/tmp/aeld
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KERNEL_REPO=git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
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KERNEL_VERSION=v6.1.14
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BUSYBOX_VERSION=1_33_1
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# FINDER_APP_DIR=$(realpath $(dirname $0))
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ARCH=arm64
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CROSS_COMPILE=aarch64-none-linux-gnu-
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if [ $# -lt 1 ]
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then
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echo "Using default directory ${OUTDIR} for output"
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else
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OUTDIR=$1
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echo "Using passed directory ${OUTDIR} for output"
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fi
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mkdir -p ${OUTDIR}
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cd "$OUTDIR"
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if [ ! -d "${OUTDIR}/linux-stable" ]; then
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#Clone only if the repository does not exist.
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echo "CLONING GIT LINUX STABLE VERSION ${KERNEL_VERSION} IN ${OUTDIR}"
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git clone ${KERNEL_REPO} --depth 1 --single-branch --branch ${KERNEL_VERSION}
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fi
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if [ ! -e ${OUTDIR}/linux-stable/arch/${ARCH}/boot/Image ]; then
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cd linux-stable
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echo "Checking out version ${KERNEL_VERSION}"
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git checkout ${KERNEL_VERSION}
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# https://unix.stackexchange.com/questions/657882/how-do-i-cross-compile-the-linux-kernel
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#make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" menuconfig
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#make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" config
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# use default config
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# make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" defconfig
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# make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE"
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# (deepclean) the kernal Biuld tree - remove any existing configuration
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make ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} mrproper
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# configure our virt device we simulate in qemu
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echo "(configure our virt)"
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make ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} defconfig
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# biuld a kernel image for booting with qemu
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echo "biuld a kernel image for booting with qemu"
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make -j4 ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} all
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# build any kernel modules
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echo "build any kernel modules"
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make ARCH=arm64 CROSS_COMPILE=${CROSS_COMPILE} modules
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# build the device tree
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make ARCH=arm64 CROSS_COMPILE=${CROSS_COMPILE} dtbs
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fi
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echo "Adding the Image in outdir"
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cp ${OUTDIR}/linux-stable/arch/${ARCH}/boot/Image ${OUTDIR}
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echo "Creating the staging directory for the root filesystem"
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cd "$OUTDIR"
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if [ -d "${OUTDIR}/rootfs" ]
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then
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echo "Deleting rootfs directory at ${OUTDIR}/rootfs and starting over"
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sudo rm -rf ${OUTDIR}/rootfs
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fi
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# TODO: Create necessary base directories
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mkdir rootfs/
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mkdir rootfs/bin
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mkdir rootfs/dev
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mkdir rootfs/etc
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mkdir rootfs/home
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mkdir rootfs/lib
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mkdir rootfs/lib/modules
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mkdir rootfs/lib64
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mkdir rootfs/lib64/modules
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mkdir rootfs/proc
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mkdir rootfs/sys
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mkdir rootfs/sbin
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mkdir rootfs/tmp
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mkdir rootfs/usr
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mkdir rootfs/usr/lib
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mkdir rootfs/usr/bin
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mkdir rootfs/usr/sbin
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mkdir rootfs/var
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mkdir rootfs/var/log
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cd "$OUTDIR"
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if [ ! -d "${OUTDIR}/busybox" ]
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then
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git clone git://busybox.net/busybox.git
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cd busybox
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git checkout ${BUSYBOX_VERSION}
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# TODO: Configure busybox
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# https://busybox.net/FAQ.html#configure
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make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" defconfig
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else
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cd busybox
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fi
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# TODO: Make and install busybox
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make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE"
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make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" CONFIG_PREFIX="${OUTDIR}/rootfs" install
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cd ..
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pwd
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echo "Library dependencies"
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${CROSS_COMPILE}readelf -a ${OUTDIR}/rootfs/bin/busybox | grep "program interpreter"
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${CROSS_COMPILE}readelf -a ${OUTDIR}/rootfs/bin/busybox | grep "Shared library"
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# TODO: Add library dependencies to rootfs
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CROSS_COMPILE_PATH=$(${CROSS_COMPILE}gcc --print-sysroot)
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cp "${CROSS_COMPILE_PATH}"/lib/ld-linux-aarch64.so.1 "${OUTDIR}"/rootfs/lib
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cp "${CROSS_COMPILE_PATH}"/lib64/libm.so.6 "${OUTDIR}"/rootfs/lib64
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cp "${CROSS_COMPILE_PATH}"/lib64/libresolv.so.2 "${OUTDIR}"/rootfs/lib64
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cp "${CROSS_COMPILE_PATH}"/lib64/libc.so.6 "${OUTDIR}"/rootfs/lib64
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# TODO: Make device nodes
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cd "$OUTDIR/rootfs"
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sudo mknod -m 666 dev/null c 1 3
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sudo mknod -m 600 dev/console c 5 1
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# TODO: Copy scripts and executables to a directory
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# on the target rootfs
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# embedded apps and ohter installs can go here?
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# cd "$FINDER_APP_DIR"
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# make clean
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# make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE"
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# cp writer ${OUTDIR}/rootfs/home
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# cp finder.sh ${OUTDIR}/rootfs/home
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# cp finder-test.sh ${OUTDIR}/rootfs/home
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# cp writer.sh ${OUTDIR}/rootfs/home
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# mkdir ${OUTDIR}/rootfs/home/conf
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# cp -r conf/. ${OUTDIR}/rootfs/home/conf
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# cp autorun-qemu.sh ${OUTDIR}/rootfs/home
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# TODO: Chown the root directory
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cd "$OUTDIR/rootfs"
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sudo chown -R root:root *
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# TODO: Create initramfs.cpio.gz
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find . | cpio -H newc -ov --owner root:root > ${OUTDIR}/initramfs.cpio
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cd "$OUTDIR"
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gzip -f initramfs.cpio
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