# Maintainer: jc_gargma <jc_gargma@iserlohn-fortress.net>
# Maintainer (Arch): Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
# 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 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=7
_minver=11
_gccpatchver='20200615'
_gccpatchger='10.1'
_gccpatchker='5.7'
_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
)
conflicts=('linux-libre-ck')
options=('!strip')
_srcname=linux-${pkgver}
source=(
  https://www.kernel.org/pub/linux/kernel/v${_supver}.x/${_srcname}.tar.{xz,sign}
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-PCI-EDR-Log-only-ACPI_NOTIFY_DISCONNECT_RECOVER-even.patch
  0003-virt-vbox-Add-support-for-the-new-VBG_IOCTL_ACQUIRE_.patch
  0004-drm-amd-display-Clear-dm_state-for-fast-updates.patch
  linux-ck-patch-${_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
  config         # the main kernel config file
  sphinx-workaround.patch
  unscrew-ck1.patch::https://github.com/ckolivas/linux/commit/0b69e633d6b0b08ae8547dc4099c8c0985019553.patch
  unscrew-ck1-fix-suspend-to-ram.patch::https://github.com/zen-kernel/zen-kernel/commit/fb7e2cfaf61cf5f9c2336331e73296f455bd2d51.patch
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)
# https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
b2sums=('0454beb9661783ab7880d387699bd33aba43f4de90ce5b5cf64c9acf59853848e4e4f3dc1e5d37597f73cbf3ad6b9ce38b21aac29afe7a558f4ece149948b75a'
        'SKIP'
        'ab1fb19c67d4c107f75767581c33d9c1458b4d9fdb88f4adb41d30a36f5a2f95f1c48ef079eb87e1e6e8ce2f98b293195cb2c0f2a8ec975aa817453289158c6e'
        '490c7d188215f1d24b5807a744853fa308c2cd17c9eb8668918a50a0c58cab9cbc9ee13ac9abbb614eb010a4a56e9092fea4440d44c80c8e67f2d9abdf19a83f'
        '00900ec68ad9ebdf5b9103cb8383ee94b97d2b243cb4458f04f877a1b294817e8a140ce2832d424030d039c48f37eaa5bc5fae7a158da495d78e659b8b3006dc'
        '66966ff5c49638074f1bf2981b4becb9a86961cdfda4834d8a690c43091e12e55b93cb7f7f29670d969fafa140c2f668bdda79dbc20f4aaac5dd93ff95f472af'
        '29b2530e91a7c0f75c47d75361a94ec92fec398cef1b3e213e97c8f9e0ed210711c4c63ae7717f59273105a83e30397cbd5b7252cb94c06d9b328a24c70ad444'
        'c8d0697f99fe6105815217b8ec059d8f587415ea8dd2b88a65e1087feedf697341a64cd56810fde9e7aeada79125fc8235faccc7e7b06492c099e27a8abbe99c'
        '2e58bb89b247b1678355368956e67c1de51fcde97a227b2162f6771e30f17fa5520faafe7be4b6816a542e7ae10d05f64c6b6354f352c12746d4b8da632936dd'
        'fde132f3705d908e6f2147c78a2193289916d72304ca5efa2229d79fc3e57a857314ce94e71425caef2f7f7b6cf87f05ef86335dc8bd4be78e7035afe608005a'
        '4c6da586168ebc0892146146221919c49091c6298cdc653b9ce9547924f08427d592aa4c95ba75760aecb77c8157e18fd95a8b83a1cc6f9e1c80e6832aaa5fe7'
        'b4e1377d97ad7e8144d6e55b6d43731e3271a5aec65b65ca6d81026a95f15f549b9303fb3c6f492099ca691e3f65f4cf7f0c3aa742df03b396d7f6d81813aa95'
        '84c9438120100bb5b21122a29344b9e818514d94a31b6d57519a6e25385cb7f91a7f87c930da55c828c7a4330959a94b8a3a3d56773c46b335e1380cd00180b1'
        '5dfb38f2096f27cf436afa6ac41d432f4e23295deb26d12146b31c57db85a8be59819f08f9c5197183c26c557b32e967edded22206c1abb9b89b83e61450ec5c')

#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-PCI-EDR-Log-only-ACPI_NOTIFY_DISCONNECT_RECOVER-even.patch
  patch -p1 -i ../0003-virt-vbox-Add-support-for-the-new-VBG_IOCTL_ACQUIRE_.patch
  patch -p1 -i ../0004-drm-amd-display-Clear-dm_state-for-fast-updates.patch
  patch -p1 -i ../sphinx-workaround.patch


  # fix naming schema in EXTRAVERSION of ck patch set
  sed -i -re "s/^(.EXTRAVERSION).*$/\1 = /" "../linux-ck-patch-${_supver}.${_majver}-${_ckpatchversion}"

  # ck patch
  echo "Applying ck patch"
  patch -F 3 -Np1 -i ../linux-ck-patch-${_supver}.${_majver}-${_ckpatchversion}
  
  # ck hotfix
  patch -Np1 -i ../unscrew-ck1.patch
  patch -Np1 -i ../unscrew-ck1-fix-suspend-to-ram.patch


  # graysky gcc patch
  echo "Applying graysky cpu 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


  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

  make menuconfig

  # 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