build_linux.sh

#!/bin/bash

set -e
source ./.config.sh || exit 1

echo "Building Linux"
mkdir -p "$LINUX_BUILD"
cd "$LINUX_BUILD"

[ -d "$LINUX_SRC" ] || {
    tar --checkpoint=400 -xf "$LINUX" || dd "Missing Linux kernel src $LINUX - try run 'make download'"
    cd "$LINUX_SRC"
    make mrproper
}
cd "$LINUX_SRC"

echo "Building kernel"
cp "$NICE_PRESET_PATH/linux.config" '.config'
make olddefconfig # comment for interactive asking
make $MAKEFLAGS

grep -q '^CONFIG_MODULES=y$' .config && make INSTALL_MOD_PATH="$TARGET/usr" INSTALL_MOD_STRIP=1 modules_install || true
make INSTALL_HDR_PATH="$TARGET/usr" INSTALL_MOD_STRIP=1 headers_install

mkdir -p "$TARGET/usr/src"
sed "s/xxLINUX_VERSIONxx/$LINUX_VERSION/" "$LINUX_BUILD/rebuild_and_reinstall.sh" > "$TARGET/usr/src/rebuild_and_reinstall_linux.sh"
if [ "${LINUX_COPY_SRC_TO_TARGET:-0}" = "1" ]; then
    echo "Copying Linux source folder to $TARGET/usr/src/$LINUX_VERSION/"
    rsync --info=progress2 --archive --delete --chmod=o-rwx "$LINUX_SRC/" "$TARGET/usr/src/$LINUX_VERSION/"

    # Update modules kernel src symlink from absolute path to host into target relative path
    if [ -r "$TARGET/usr/lib/modules/$LINUX_VERSION/" ]; then
        pushd "$TARGET/usr/lib/modules/$LINUX_VERSION/"
            rm -f build source
            ln -s "../../../src/$LINUX_VERSION/" 'build'
            ln -s "../../../src/$LINUX_VERSION/" 'source'
        popd
    fi
fi

cp -f "$LINUX_SRC/.config" "$TARGET/boot/kernel.config"
cp -f "$LINUX_SRC/System.map" "$TARGET/boot/System.map"
cp -f "$LINUX_SRC/arch/${ARCH:-x86}/boot/"*Image "$TARGET/boot/vmlinuz"
[ -r "$LINUX_SRC/arch/${ARCH:-x86}/boot/dts/" ] && rm -rf "$TARGET/boot/dts/" && cp -r "$LINUX_SRC/arch/${ARCH:-x86}/boot/dts/" "$TARGET/boot/" || true