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#!/bin/sh

MAKEDEPS="make bc cpio linux-headers toybox kmod"

PKG_VER=6.3.1
SOURCE=https://cdn.kernel.org/pub/linux/kernel/v${PKG_VER%%.*}.x/linux-$PKG_VER.tar.xz
ADDITIONAL="
    config
"

prepare () {
    apply_patches
    cp config .config

    export GREP="ggrep"

    make olddefconfig
    make -s kernelrelease > version

    # toybox's dd does not have this option
    sed -i 's/status=\S*//g' scripts/link-vmlinux.sh

    echo "Prepared linux version $(cat version)"
}

build () {
    make all 
}

package () {
    local kernver="$(cat version)"
    local modulesdir="$PKG_DEST/usr/lib/modules/$kernver"

    echo "Installing boot image..."
    mkdir -p $PKG_DEST/boot

    cp arch/x86/boot/bzImage $PKG_DEST/boot/vmlinuz-$kernver
    cp System.map $PKG_DEST/boot/System.map-$kernver
    cp .config $PKG_DEST/boot/config-$kernver

    install -d $PKG_DEST/usr/share/doc/linux-$kernver
    cp -r Documentation/* $PKG_DEST/usr/share/doc/linux-$kernver

    install -m755 -d $PKG_DEST/etc/modprobe.d
    cat > $PKG_DEST/etc/modprobe.d/usb.conf << "EOF"
# Begin /etc/modprobe.d/usb.conf

install ohci_hcd /sbin/modprobe ehci_hcd ; /sbin/modprobe -i ohci_hcd ; true
install uhci_hcd /sbin/modprobe ehci_hcd ; /sbin/modprobe -i uhci_hcd ; true

# End /etc/modprobe.d/usb.conf
EOF

  echo "Installing modules..."
  make INSTALL_MOD_PATH="$PKG_DEST/usr" INSTALL_MOD_STRIP=1 modules_install
  builddir=$modulesdir/build
  rm $modulesdir/source
  rm $builddir
  mkdir $builddir
  echo "Installing build files..."
  install -D -m644 .config "$builddir" 
  install -D -m644 Makefile "$builddir" 
  install -D -m644 Module.symvers "$builddir" 
  install -D -m644 System.map "$builddir" 
  install -D -m644 version "$builddir" 
  install -D -m644 vmlinux "$builddir" 
  install -D -m644 kernel/Makefile "$builddir/kernel/Makefile" 
  install -D -m644 arch/x86/Makefile "$builddir/arch/x86/Makefile" 
  cp -r scripts "$builddir"

  install -D tools/objtool/objtool "$builddir/tools/objtool"
  install -D tools/bpf/resolve_btfids/resolve_btfids "$builddir/tools/bpf/resolve_btfids" 
  ln -s /usr/src/linux $modulesdir/source
}