# Maintainer: Josip Ponjavic <josipponjavic at gmail dot com>
# Contributor:

### BUILD OPTIONS
# Set these variables to ANYTHING that is not null to enable them

# Tweak kernel options prior to a build via nconfig
_makenconfig=

_enable_gcc_more_v="y"
# Optionally select a sub architecture by number if building in a clean chroot
# Leaving this entry blank will require user interaction during the build 
# which will cause a failure to build if using makechrootpkg. Note that the
# generic (default) option is 26.
#
#  1. AMD Opteron/Athlon64/Hammer/K8 (MK8)
#  2. AMD Opteron/Athlon64/Hammer/K8 with SSE3 (MK8SSE3)
#  3. AMD 61xx/7x50/PhenomX3/X4/II/K10 (MK10)
#  4. AMD Barcelona (MBARCELONA)
#  5. AMD Bobcat (MBOBCAT)
#  6. AMD Jaguar (MJAGUAR)
#  7. AMD Bulldozer (MBULLDOZER)
#  8. AMD Piledriver (MPILEDRIVER)
#  9. AMD Steamroller (MSTEAMROLLER)
#  10. AMD Excavator (MEXCAVATOR)
#  11. AMD Zen (MZEN)
#  12. Intel P4 / older Netburst based Xeon (MPSC)
#  13. Intel Atom (MATOM)
#  14. Intel Core 2 (MCORE2)
#  15. Intel Nehalem (MNEHALEM)
#  16. Intel Westmere (MWESTMERE)
#  17. Intel Silvermont (MSILVERMONT)
#  18. Intel Sandy Bridge (MSANDYBRIDGE)
#  19. Intel Ivy Bridge (MIVYBRIDGE)
#  20. Intel Haswell (MHASWELL)
#  21. Intel Broadwell (MBROADWELL)
#  22. Intel Skylake (MSKYLAKE)
#  23. Intel Skylake X (MSKYLAKEX)
#  24. Intel Cannon Lake (MCANNONLAKE)
#  25. Intel Ice Lake (MICELAKE)
#  26. Generic-x86-64 (GENERIC_CPU)
#  27. Native optimizations autodetected by GCC (MNATIVE)
_subarch=

# Compile ONLY probed modules
# As of mainline 2.6.32, running with this option will only build the modules
# that you currently have probed in your system VASTLY reducing the number of
# modules built and the build time to do it.
#
# WARNING - ALL modules must be probed BEFORE you begin making the pkg!
#
# To keep track of which modules are needed for your specific system/hardware,
# give module_db script a try: https://aur.archlinux.org/packages/modprobed-db
# This PKGBUILD will call it directly to probe all the modules you have logged!
#
# More at this wiki page ---> https://wiki.archlinux.org/index.php/Modprobed-db
_localmodcfg=

# If you have laptop with optimus and it hangs on boot one solution might be 
# to set acpi_rev_override. Yet for this to happen kernel should be compiled
# with `CONFIG_ACPI_REV_OVERRIDE_POSSIBLE`. Set next variable to `y` to enable.
_rev_override="n"

### IMPORTANT: Do no edit below this line unless you know what you're doing

pkgbase=linux-clear
__basekernel=4.18
_minor=1
pkgver=${__basekernel}.${_minor}
_clearver=${pkgver}-620
pkgrel=1
arch=('x86_64')
url="https://github.com/clearlinux-pkgs/linux"
license=('GPL2')
makedepends=('bc' 'git' 'inetutils' 'kmod' 'libelf' 'linux-firmware' 'xmlto')
options=('!strip')
_gcc_more_v='20180509'
source=(
  "https://www.kernel.org/pub/linux/kernel/v4.x/linux-${__basekernel}.tar.xz"
  "https://www.kernel.org/pub/linux/kernel/v4.x/linux-${__basekernel}.tar.sign"
  "https://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.xz"
  "clearlinux::git+https://github.com/clearlinux-pkgs/linux.git#tag=${_clearver}"
  'https://downloadmirror.intel.com/28039/eng/microcode-20180807.tgz'
  "enable_additional_cpu_optimizations-$_gcc_more_v.tar.gz::https://github.com/graysky2/kernel_gcc_patch/archive/$_gcc_more_v.tar.gz" # enable_additional_cpu_optimizations_for_gcc
  '60-linux.hook'  # pacman hook for depmod
  '90-linux.hook'  # pacman hook for initramfs regeneration
  '99-linux.hook'  # pacman hook for remove initramfs
  'linux.preset'   # standard config files for mkinitcpio ramdisk
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)
sha256sums=('19d8bcf49ef530cd4e364a45b4a22fa70714b70349c8100e7308488e26f1eaf1'
            'SKIP'
            'f0580daf3ea0716301c929be78c09db4dc3d8add65a1da392c2fc2c841244e8c'
            'SKIP'
            '29f9e8dc27e6c9b6488cecd7fe2394030307799e511db2d197d9e6553a7f9e40'
            '226e30068ea0fecdb22f337391385701996bfbdba37cdcf0f1dbf55f1080542d'
            'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
            '75f99f5239e03238f88d1a834c50043ec32b1dc568f2cc291b07d04718483919'
            '5f6ba52aaa528c4fa4b1dc097e8930fad0470d7ac489afcb13313f289ca32184'
            'ad6344badc91ad0630caacde83f7f9b97276f80d26a20619a87952be65492c65')

_kernelname=${pkgbase#linux}

prepare() {
  cd linux-${__basekernel}

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

  # Apply clearlinux patches
  for i in $(grep '^Patch' ${srcdir}/clearlinux/linux.spec | grep -Ev '^Patch0500' | sed -n 's/.*: //p'); do
    msg "Applying ${i}"
    patch -p1 -i "$srcdir/clearlinux/${i}"
  done

  # Clean tree and copy CLEAR config over
  make mrproper

  cp -Tf $srcdir/clearlinux/config ./.config
  cp -a /usr/lib/firmware/i915 firmware/
  cp -a ${srcdir}/intel-ucode firmware/
  cp  ${srcdir}/intel-ucode-with-caveats/06* firmware/intel-ucode/
  rm -f firmware/intel-ucode/0f*

  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 and empty localversion
  sed -e "/^EXTRAVERSION =/s/=.*/= -${pkgrel}/" \
      -e "/^EXTRAVERSION =/aLOCALVERSION =" \
      -i Makefile

  # set ACPI_REV_OVERRIDE_POSSIBLE to prevent optimus lockup
  if [ "${_rev_override}" = "y" ]; then
    sed -i "s|# CONFIG_ACPI_REV_OVERRIDE_POSSIBLE is not set|CONFIG_ACPI_REV_OVERRIDE_POSSIBLE=y|g" ./.config
  fi

  # bluez package on arch needs this module for bluetooth to work
  # https://bugs.archlinux.org/task/55880
  sed -i "s|# CONFIG_CRYPTO_USER is not set|CONFIG_CRYPTO_USER=m|g" ./.config

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

  make olddefconfig

  # Patch source to unlock additional gcc CPU optimizatons
  # https://github.com/graysky2/kernel_gcc_patch
  if [ "${_enable_gcc_more_v}" = "y" ]; then
    patch -Np1 -i "$srcdir/kernel_gcc_patch-$_gcc_more_v/enable_additional_cpu_optimizations_for_gcc_v8.1+_kernel_v4.13+.patch"
  fi

  # get kernel version
  if [ "${_enable_gcc_more_v}" = "y" ] || [ -n "${_subarch}" ]; then
    yes "$_subarch" | make oldconfig
  else
    make prepare
  fi

  ### Optionally load needed modules for the make localmodconfig
  # See https://aur.archlinux.org/packages/modprobed-db
  if [ -n "$_localmodcfg" ]; then
    msg "If you have modprobed-db installed, running it in recall mode now"
    if [ -e /usr/bin/modprobed-db ]; then
      [[ -x /usr/bin/sudo ]] || {
      echo "Cannot call modprobe with sudo. Install sudo and configure it to work with this user."
      exit 1; }
      sudo /usr/bin/modprobed-db recall
    fi
    msg "Running Steven Rostedt's make localmodconfig now"
    make localmodconfig
  fi

  [[ -z "$_makenconfig" ]] || make nconfig

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

  # save configuration for later reuse
  cp -Tf ./.config "${startdir}/config-${pkgver}-${pkgrel}${_kernelname}"
}

build() {
  cd linux-${__basekernel}

  make bzImage modules
}

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

  cd linux-${__basekernel}

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

  mkdir -p "${pkgdir}"/{boot,usr/lib/modules}
  make INSTALL_MOD_PATH="${pkgdir}/usr" modules_install
  cp arch/x86/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgbase}"

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

  # add real version for building modules and running depmod from hook
  echo "${_kernver}" |
    install -Dm644 /dev/stdin "${pkgdir}/usr/lib/modules/${_extramodules}/version"

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

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

  # add vmlinux
  install -Dt "${pkgdir}/usr/lib/modules/${_kernver}/build" -m644 vmlinux

  # sed expression for following substitutions
  local _subst="
    s|%PKGBASE%|${pkgbase}|g
    s|%KERNVER%|${_kernver}|g
    s|%EXTRAMODULES%|${_extramodules}|g
  "

  # hack to allow specifying an initially nonexisting install file
  sed "${_subst}" "${startdir}/${install}" > "${startdir}/${install}.pkg"
  true && install=${install}.pkg

  # install mkinitcpio preset file
  sed "${_subst}" ../linux.preset |
    install -Dm644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # install pacman hooks
  sed "${_subst}" ../60-linux.hook |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/60-${pkgbase}.hook"
  sed "${_subst}" ../90-linux.hook |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/90-${pkgbase}.hook"
  sed "${_subst}" ../99-linux.hook |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/99-${pkgbase}.hook"
}

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

  cd linux-${__basekernel}
  local _builddir="${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 "${_builddir}/arch/x86" -m644 arch/x86/Makefile
  install -Dt "${_builddir}/arch/x86/kernel" -m644 arch/x86/kernel/asm-offsets.s

  cp -t "${_builddir}/arch/x86" -a arch/x86/include

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

  # http://bugs.archlinux.org/task/13146
  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
  install -Dt "${_builddir}/tools/objtool" tools/objtool/objtool

  # remove unneeded architectures
  local _arch
  for _arch in "${_builddir}"/arch/*/; do
    [[ ${_arch} == */x86/ ]] && continue
    rm -r "${_arch}"
  done

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

  # remove now broken symlinks
  find -L "${_builddir}" -type l -printf 'Removing %P\n' -delete

  # 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"

  cd linux-${__basekernel}
  local _builddir="${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#${pkgbase}}")
    _package${_p#${pkgbase}}
  }"
done

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