# Maintainer: jc_gargma <jc_gargma@iserlohn-fortress.net>
# Maintainer (Arch): Jan Alexander Steffens (heftig) <heftig@archlinux.org>
# Contributor: Aqua-sama <aqua@iserlohn-fortress.net>

# # I maintain this because:
# Arch version patch script does not apply consistently
# Arch version lacks graysky gcc patch
# Arch version lacks ath9k regdom and raid6 algo patches
# Arch version lacks ck patches
# Arch version is 300 Hz
# Arch version does not disable lockdown eee
# Arch version does not disable hdcp
# Arch version does not disable IME/PSP/TEE/SEV
# Arch version allows insecure filesystems
# Arch version enables staging drivers
# Arch version enables ISDN and Infiniband
# Arch version enables VMware and HyperV
# Arch version builds documentation

_custom=1

pkgbase=linux-ck
_supver=5
_majver=10
_minver=10
_gccpatchver='20201113'
_gccpatchger='10.1'
_gccpatchker='5.8'
_ckpatchversion=ck1
  if [ "$_minver" == "0" ]; then
    pkgver=${_supver}.${_majver}
  else
    pkgver=${_supver}.${_majver}.${_minver}
  fi
pkgrel=1
pkgdesc='Linux-ck'
url='https://kernel.org'
#url='http://ck.kolivas.org/patches/'
arch=(x86_64)
license=(GPL2)
makedepends=(
  bc kmod libelf pahole cpio perl tar xz
  xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick
)
conflicts=('linux-libre-ck')
options=('!strip')
_srcname=linux-${pkgver}
source=(
  https://www.kernel.org/pub/linux/kernel/v${_supver}.x/${_srcname}.tar.{xz,sign}
  config         # the main kernel config file
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-HID-quirks-Add-Apple-Magic-Trackpad-2-to-hid_have_special_driver-list.patch
  0003-iwlwifi-Fix-regression-from-UDP-segmentation-support.patch
  0004-HID-wacom-Correct-NULL-dereference-on-AES-pen-proximity.patch
  linux-ck-patch-${_supver}.${_majver}-${_ckpatchversion}.xz::http://ck.kolivas.org/patches/${_supver}.0/${_supver}.${_majver}/${_supver}.${_majver}-${_ckpatchversion}/patch-${_supver}.${_majver}-${_ckpatchversion}.xz
  kernel_gcc_patch-${_gccpatchver}.tar.gz::https://github.com/graysky2/kernel_gcc_patch/archive/${_gccpatchver}.tar.gz
  ath9k-regdom-hack.patch
  raid6-default-algo.patch
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)
# https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
b2sums=('180f0dd063eab9542fd799c54dd335c4f310bea739048800ab3222526cb1ea7cc4ef43d2a2c27ed0e37a776f5c77540c33795aa63297704d9e215735a1a98606'
        'SKIP'
        'e8f7b8d77e57b8df10e27903347ba6995a98d15c37bdd5d243c00ffcfe8eb2bb58f11ab11dafdc005cb109ad2e55ec43f8d95caad7a2ce013928ae86b1547954'
        '2f9195675270d79d735a3aaec25887c2f80b76eae98be8fcc5fd59ab71d925c5ee20ec5e2a015deb68b61bc2cc7f56f546a22cb96ee038e2e24c2c9dd5c3f79f'
        'd8297e09f552a2d6bb24c2ba10481fd2b407057f3b24278e72a89233473460d339c83838791989773623178b5af80588fb4c484da2931f1040e313cce7ceca00'
        '15d9b32ff1ad4c897b097173de259cdb89bbbf6ab0230faf4557eca511a59c1f2c76b85be30d25cf9534f91e1af43e72d072bc82dbf2219eadf772822f573d38'
        '078dca48f0937ad021b1d50ba98dc1c156fb67a18b25fa079d2d35d0aa5480fb820e952c7f569cff5744cd32976a23942c2e822d1cfada8144e9a8dc9bae1d82'
        '067f3389124fdd937ca69e9e9568b1b3194791960a093e81037051eb6d25e80b40bf7f60c61373ac9e92bff9db760766009b1e6f9ee8429a883bb7fce2d60f8a'
        '7f1eb5938472f57748216bd00e0c875feab99fc1c5cb89babfea467ee30ca5c8e9fc5a691efe2e602bef1ea79820c5383822d7cec354b48d23321ccda8ee8127'
        'b6ef77035611139fa9a6d5b8d30570e2781bb4da483bb569884b0bd0129b62e0b82a5a6776fefe43fee801c70d39de1ea4d4c177f7cedd5ac135e3c64f7b895a'
        'fde132f3705d908e6f2147c78a2193289916d72304ca5efa2229d79fc3e57a857314ce94e71425caef2f7f7b6cf87f05ef86335dc8bd4be78e7035afe608005a')

#export KBUILD_BUILD_HOST=arc4linux
export KBUILD_BUILD_USER=$pkgbase
export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

prepare() {
  cd $_srcname

  # add upstream patch
#  if [ "$_minver" != "0" ]; then
#    echo "Applying upstream patch"
#    patch -Np1 < ../patch-${_supver}.${_majver}-${pkgver}
#  fi


  # Hotfixes
  echo "Applying hotfixes"
  patch -p1 -i ../0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  patch -p1 -i ../0002-HID-quirks-Add-Apple-Magic-Trackpad-2-to-hid_have_special_driver-list.patch
  patch -p1 -i ../0003-iwlwifi-Fix-regression-from-UDP-segmentation-support.patch
  patch -p1 -i ../0004-HID-wacom-Correct-NULL-dereference-on-AES-pen-proximity.patch


  # ck patch
  echo "Applying ck patch"
  patch -F 3 -Np1 -i ../linux-ck-patch-${_supver}.${_majver}-${_ckpatchversion}

  # Remove the -ck EXTRAVERSION
  sed -re "s/^(.EXTRAVERSION).*$/\1 = /" -i Makefile


  # graysky gcc patch
  echo "Applying graysky gcc patch"
  patch -p1 -i ../kernel_gcc_patch-${_gccpatchver}/enable_additional_cpu_optimizations_for_gcc_v${_gccpatchger}+_kernel_v${_gccpatchker}+.patch


  # Ignore ath9k eeprom patch
  echo "Applying ath9k patch"
  patch -p1 -i ../ath9k-regdom-hack.patch

  # Set default raid6 algo patch
  echo " Applying raid6 patch"
  patch -p1 -i ../raid6-default-algo.patch


  # Append pkgrel and patchset suffixes
  echo "Setting version..."
  scripts/setlocalversion --save-scmversion
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "${pkgbase#linux}" > localversion.20-pkgname


  echo "Setting config..."
  # we are in src/linux-x.yy.zz, looking for a config next to the pkgbuild
#  if [ "$_custom" == "1" ]; then
#    if [ -f ${SRCDEST}/config.ck.previous ]; then
#      cp ${SRCDEST}/config.ck.previous .config
#    fi
#  else
    cp ../config .config
#  fi

  make olddefconfig

#  if [ -f $HOME/.config/modprobed.db ]; then
#    echo "Running make localmodconfig"
#    make LSMOD=$HOME/.config/modprobed.db localmodconfig
#  fi

  if [ "$_custom" == "1" ]; then
  make menuconfig
  fi

  # Remove sublevel when no sublevel exists
  if [ "$_minver" == "0" ]; then
    sed -i '/SUBLEVEL = 0/d' Makefile
  fi

  make -s kernelrelease > version

  # workaround for make -s kernelrelease not applying
  # localversion to version when changed using menuconfig
  grep -Po '(?<=CONFIG_LOCALVERSION=").*(?=")' .config > ../localversion
  echo "$pkgver" > ../version.temp
  cat "localversion.10-pkgrel" >> ../version.temp
  cat "localversion.20-pkgname" >> ../version.temp
  cat ../localversion >> ../version.temp
  cat ../version.temp | tr -d "\n" > version

  # back up the config
  if [ "$_custom" == "1" ]; then
    echo "Backing up config..."
    cp .config ${SRCDEST}/config.ck.previous
  fi

  echo "Prepared $pkgbase version $(<version)"
}

build() {
  cd $_srcname
  make all
}

_package() {
  pkgdesc="The $pkgdesc kernel and modules"
  depends=(coreutils kmod initramfs)
  optdepends=('crda: to set the correct wireless channels of your country'
              'linux-firmware: firmware images needed for some devices')
  provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE)

  cd $_srcname
  local kernver="$(<version)"
  local modulesdir="$pkgdir/usr/lib/modules/$kernver"

  echo "Installing boot image..."
  # systemd expects to find the kernel here to allow hibernation
  # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
  install -Dm644 "$(make -s image_name)" "$modulesdir/vmlinuz"

  # Used by mkinitcpio to name the kernel
  echo "$pkgbase" | install -Dm644 /dev/stdin "$modulesdir/pkgbase"

  echo "Installing modules..."
  #make INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 modules_install
  make INSTALL_MOD_PATH="$pkgdir/usr" modules_install

  # remove build and source links
  rm "$modulesdir"/{source,build}
}

_package-headers() {
  pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"

  cd $_srcname
  local builddir="$pkgdir/usr/lib/modules/$(<version)/build"

  echo "Installing build files..."
  install -Dt "$builddir" -m644 .config Makefile Module.symvers System.map \
    localversion.* version vmlinux
  install -Dt "$builddir/kernel" -m644 kernel/Makefile
  install -Dt "$builddir/arch/x86" -m644 arch/x86/Makefile
  cp -t "$builddir" -a scripts

  # 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

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

  echo "Installing headers..."
  cp -t "$builddir" -a include
  cp -t "$builddir/arch/x86" -a arch/x86/include
  install -Dt "$builddir/arch/x86/kernel" -m644 arch/x86/kernel/asm-offsets.s

  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

  echo "Installing KConfig files..."
  find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

  echo "Removing unneeded architectures..."
  local arch
  for arch in "$builddir"/arch/*/; do
    [[ $arch = */x86/ ]] && continue
    echo "Removing $(basename "$arch")"
    rm -r "$arch"
  done

  echo "Removing documentation..."
  rm -r "$builddir/Documentation"

  echo "Removing broken symlinks..."
  find -L "$builddir" -type l -printf 'Removing %P\n' -delete

  echo "Removing loose objects..."
  find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

  echo "Stripping build tools..."
  local file
  while read -rd '' file; do
    case "$(file -bi "$file")" in
      application/x-sharedlib\;*)      # Libraries (.so)
        strip -v $STRIP_SHARED "$file" ;;
      application/x-archive\;*)        # Libraries (.a)
        strip -v $STRIP_STATIC "$file" ;;
      application/x-executable\;*)     # Binaries
        strip -v $STRIP_BINARIES "$file" ;;
      application/x-pie-executable\;*) # Relocatable binaries
        strip -v $STRIP_SHARED "$file" ;;
    esac
  done < <(find "$builddir" -type f -perm -u+x ! -name vmlinux -print0)

  #echo "Stripping vmlinux..."
  #strip -v $STRIP_STATIC "$builddir/vmlinux"

  echo "Adding symlink..."
  mkdir -p "$pkgdir/usr/src"
  ln -sr "$builddir" "$pkgdir/usr/src/$pkgbase"
}

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