# Maintainer: Dan Ziemba <zman0900@gmail.com>
# Maintainer: Mark Weiman <markzz@archlinux.net>

pkgbase=linux-vfio
_srcname=linux-4.13
pkgver=4.13.12
pkgrel=1
arch=('i686' 'x86_64')
url="http://www.kernel.org/"
license=('GPL2')
makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc' 'libelf')
options=('!strip')
source=("https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
        "https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.sign"
        "https://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.xz"
        "https://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.sign"
        # the main kernel config files
        'config' 'config.x86_64'
        # pacman hook for initramfs regeneration
        '90-linux.hook'
        # standard config files for mkinitcpio ramdisk
        'linux.preset'
        # patches for pci passthrough
        'add-acs-overrides.patch'
        'i915-vga-arbiter.patch')
sha256sums=('2db3d6066c3ad93eb25b973a3d2951e022a7e975ee2fa7cbe5bddf84d9a49a2c'
            'SKIP'
            'd5830f31cf8522986fb530e69b3b9b023f0298c4f88d897541ff0776dc805828'
            'SKIP'
            '9b1d9fcb55782e6149aca4dc2d3b250dd4cedf1bf4bd8c6f0968acab0e2e0ee4'
            '9c6c4d27d59638d0569ea09a97138bfcfb219f17cdf1138be141380e6654f302'
            '8f407ad5ff6eff106562ba001c36a281134ac9aa468a596aea660a4fe1fd60b5'
            '99d0102c8065793096b8ea2ccc01c41fa3dcb96855f9f6f2c583b2372208c6f9'
            '05467ff4108e13c8a1fed9e2cc5b4e7b50c83e97e39b82d5478ea89b4af475ea'
            '19fd3b81b4b081ceb100c89fb6bab012a8d708da6ca8cee53d771abca4770236')
validpgpkeys=(
              'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
              '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
             )

_kernelname=${pkgbase#linux}

prepare() {
  cd "${srcdir}/${_srcname}"

  # add upstream patch
  patch -p1 -i "${srcdir}/patch-${pkgver}"

  # add latest fixes from stable queue, if needed
  # http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git

  if [ "${CARCH}" = "x86_64" ]; then
    cat "${srcdir}/config.x86_64" > ./.config
  else
    cat "${srcdir}/config" > ./.config
  fi

  # patches for vga arbiter fix in intel systems
  echo '==> Applying i915 VGA arbitration patch'
  patch -p1 -i "${srcdir}/i915-vga-arbiter.patch"

  # Overrides for missing acs capabilities
  echo '==> Applying ACS override patch'
  patch -p1 -i "${srcdir}/add-acs-overrides.patch"

  if [ "${_kernelname}" != "" ]; then
    sed -i "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_kernelname}\"|g" ./.config
    sed -i "s|CONFIG_LOCALVERSION_AUTO=.*|CONFIG_LOCALVERSION_AUTO=n|" ./.config
  fi

  # set extraversion to pkgrel
  sed -ri "s|^(EXTRAVERSION =).*|\1 -${pkgrel}|" Makefile

  # don't run depmod on 'make install'. We'll do this ourselves in packaging
  sed -i '2iexit 0' scripts/depmod.sh

  # get kernel version
  make prepare

  # load configuration
  # Configure the kernel. Replace the line below with one of your choice.
  #make menuconfig # CLI menu for configuration
  #make nconfig # new CLI menu for configuration
  #make xconfig # X-based configuration
  #make oldconfig # using old config from previous kernel version
  # ... or manually edit .config

  # rewrite configuration
  yes "" | make config >/dev/null
}

build() {
  cd "${srcdir}/${_srcname}"

  make ${MAKEFLAGS} LOCALVERSION= bzImage modules
}

_common_package() {
  cd "${srcdir}/${_srcname}"

  KARCH=x86

  # get kernel version
  _kernver="$(make LOCALVERSION= kernelrelease)"
  _basekernel=${_kernver%%-*}
  _basekernel=${_basekernel%.*}
}

_package() {
  pkgdesc="The Linux kernel and modules with patches to enable GPU passthrough with KVM"
  [ "${pkgbase}" = "linux" ] && groups=('base')
  depends=('coreutils' 'linux-firmware' 'kmod' 'mkinitcpio>=0.7')
  optdepends=('crda: to set the correct wireless channels of your country')
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
  install=linux.install

mkdir -p "${pkgdir}"/{lib/modules,lib/firmware,boot}
  make LOCALVERSION= INSTALL_MOD_PATH="${pkgdir}" modules_install
  cp arch/$KARCH/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgbase}"

  # set correct depmod command for install
  sed -e "s|%PKGBASE%|${pkgbase}|g;s|%KERNVER%|${_kernver}|g" \
    "${startdir}/${install}" > "${startdir}/${install}.pkg"
  true && install=${install}.pkg

  # install mkinitcpio preset file for kernel
  sed "s|%PKGBASE%|${pkgbase}|g" ../linux.preset |
    install -Dm644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # install pacman hook for initramfs regeneration
  sed "s|%PKGBASE%|${pkgbase}|g" ../90-linux.hook |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/90-${pkgbase}.hook"

  # remove build and source links
  rm "${pkgdir}"/lib/modules/${_kernver}/{source,build}

  # remove the firmware
  rm -r "${pkgdir}/lib/firmware"

  # make room for external modules
  ln -s "../extramodules-${_basekernel}${_kernelname:--ARCH}" "${pkgdir}/lib/modules/${_kernver}/extramodules"

  # add real version for building modules and running depmod from post_install/upgrade
  echo "${_kernver}" |
    install -Dm644 /dev/stdin "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--ARCH}/version"

  # Now we call depmod...
  depmod -b "${pkgdir}" -F System.map "${_kernver}"

  # move module tree /lib -> /usr/lib
  mv -t "${pkgdir}/usr" "${pkgdir}/lib"

  # add vmlinux
  install -Dm644 vmlinux "${pkgdir}/usr/lib/modules/${_kernver}/build/vmlinux"
}

_package-headers() {
  pkgdesc="Header files and scripts for building modules for ${pkgbase/linux/Linux} kernel"

  local _builddir="${pkgdir}/usr/lib/modules/${_kernver}/build"

  install -Dt "${_builddir}" -m644 Makefile .config Module.symvers
  install -Dt "${_builddir}/kernel" -m644 kernel/Makefile

  mkdir "${_builddir}/.tmp_versions"

  cp -t "${_builddir}" -a include scripts

  install -Dt "${_builddir}/arch/${KARCH}" -m644 arch/${KARCH}/Makefile
  install -Dt "${_builddir}/arch/${KARCH}/kernel" -m644 arch/${KARCH}/kernel/asm-offsets.s

  if [[ ${CARCH} = i686 ]]; then
    install -t "${_builddir}/arch/${KARCH}" -m644 arch/${KARCH}/Makefile_32.cpu
  fi

  cp -t "${_builddir}/arch/${KARCH}" -a arch/${KARCH}/include

  install -Dt "${_builddir}/drivers/md" -m644 drivers/md/*.h
  install -Dt "${_builddir}/net/mac80211" -m644 net/mac80211/*.h

  # http://bugs.archlinux.org/task/9912
  install -Dt "${_builddir}/drivers/media/dvb-core" -m644 drivers/media/dvb-core/*.h

  # http://bugs.archlinux.org/task/13146
  install -Dt "${_builddir}/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/lgdt330x.h
  install -Dt "${_builddir}/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

  # http://bugs.archlinux.org/task/20402
  install -Dt "${_builddir}/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
  install -Dt "${_builddir}/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
  install -Dt "${_builddir}/drivers/media/tuners" -m644 drivers/media/tuners/*.h

  # add xfs and shmem for aufs building
  mkdir -p "${_builddir}"/{fs/xfs,mm}

  # copy in Kconfig files
  find . -name Kconfig\* -exec install -Dm644 {} "${_builddir}/{}" \;

  # add objtool for external module building and enabled VALIDATION_STACK option
  if [[ -e tools/objtool/objtool ]]; then
    install -Dt "${_builddir}/tools/objtool" tools/objtool/objtool
  fi

  # remove unneeded architectures
  local _arch
  for _arch in "${_builddir}"/arch/*/; do
    if [[ ${_arch} != */${KARCH}/ ]]; then
      rm -r "${_arch}"
    fi
  done

  # remove files already in linux-docs package
  rm -r "${_builddir}/Documentation"

  # Fix permissions
  chmod -R u=rwX,go=rX "${_builddir}"

  # strip scripts directory
  local _binary _strip
  while read -rd '' _binary; do
    case "$(file -bi "${_binary}")" in
      *application/x-sharedlib*)  _strip="${STRIP_SHARED}"   ;; # Libraries (.so)
      *application/x-archive*)    _strip="${STRIP_STATIC}"   ;; # Libraries (.a)
      *application/x-executable*) _strip="${STRIP_BINARIES}" ;; # Binaries
      *) continue ;;
    esac
    /usr/bin/strip ${_strip} "${_binary}"
  done < <(find "${_builddir}/scripts" -type f -perm -u+w -print0 2>/dev/null)
}

_package-docs() {
  pkgdesc="Kernel hackers manual - HTML documentation that comes with the ${pkgbase/linux/Linux} kernel"

  local _builddir="${pkgdir}/usr/lib/modules/${_kernver}/build"

  mkdir -p "${_builddir}"
  cp -t "${_builddir}" -a Documentation

  # Fix permissions
  chmod -R u=rwX,go=rX "${_builddir}"
}

pkgname=("${pkgbase}" "${pkgbase}-headers" "${pkgbase}-docs")
for _p in ${pkgname[@]}; do
  eval "package_${_p}() {
    $(declare -f "_package${_p#${pkgbase}}")
    _common_package
    _package${_p#${pkgbase}}
  }"
done

# vim:set ts=8 sts=2 sw=2 et: