# 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 is 300 Hz
# Arch version does not disable lockdown or integrity eee
# Arch version does not disable HDCP
# Arch version does not disable IME/PSP and SGX/SEV and TXT/TEE/TDX and PXP
# Arch version does not disable /dev/random being directly filled by rdrand
# Arch version uses git

# set _custom to 0 when using mkchrootpkg
_custom=0

pkgbase=linux
_supver=6
_majver=0
_minver=6
_gccpatchver='20220315'
_gccpatchker='5.17+'
  if [ "$_minver" == "0" ]; then
    pkgver=${_supver}.${_majver}
  else
    pkgver=${_supver}.${_majver}.${_minver}
  fi
pkgrel=1
pkgdesc='Linux'
url='https://kernel.org'
arch=(x86_64)
license=(GPL2)
makedepends=(
  bc libelf pahole cpio perl tar xz
  xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick texlive-latexextra
)
conflicts=('linux-libre')
options=('!strip')
_srcname=linux-${pkgver}
source=(
  https://www.kernel.org/pub/linux/kernel/v${_supver}.x/${_srcname}.tar.{xz,sign}
  config         # the main kernel config file
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-mm-vmscan-fix-extreme-overreclaim-and-swap-floods.patch
  0003-soundwire-intel-Initialize-clock-stop-timeout.patch
  0004-drm-sched-add-DRM_SCHED_FENCE_DONT_PIPELINE-flag.patch
  0005-drm-amdgpu-use-DRM_SCHED_FENCE_DONT_PIPELINE-for-VM-.patch
  0006-drm-amdgpu-Fix-VRAM-BO-swap-issue.patch
  0007-drm-amdgpu-Fix-for-BO-move-issue.patch
  kernel_compiler_patch-${_gccpatchver}.tar.gz::https://github.com/graysky2/kernel_compiler_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
sha256sums=('864b05af2d869ba73d61a9c5959e4531a141ab2bd7b217483671f625f9747faa'
            'SKIP'
            '6cae8edbfa8793f8f439b625eddac6c229b2703bb1ecb834da6339fb2b96cfbb'
            'f1aafd32cd42e9ebb3475597db05bf27561ae52a7b48ec5bc353be3ca50925a1'
            '0a4ab2a5f7cf2cd78ca20678775f4ead39169bd7d7ba5e7ecae9053a9c94071b'
            'ef1e125fb021ab64aeeda696408d6ed8232a4261a0a2489afc560350fc7312bc'
            'feac2bd6fc4ee7c566975e09cb55bdc7be192988b037a0e79fd7e51f3f914221'
            '76052ea5929bac6b4fccc77b321cb273d6fca64426b7584fca5ff36a470d6eb1'
            'e0e9dc4b1a0ea0fd1af0825c0b49844ea364e3163c4291b8712919f49914c4ef'
            '1487f13aa32de66562fca3b61e8c97c45c6f8dc2362403b141be2db423fcc3e1'
            '5a29d172d442a3f31a402d7d306aaa292b0b5ea29139d05080a55e2425f48c5c'
            'e9e0d289170b7fb598b572d9c892ae8d1420952034aa415e8b3334f20a58edcc'
            '6ab863c8cfe6e0dd53a9d6455872fd4391508a8b97ab92e3f13558a6617b12a6')
b2sums=('af53568340db3d63e3bbe8c5f27fff1e285b332845b9af960ee230c116e0555cc50857b6617d1b54f56e8de6717a940ff443cae9bf7dd8cc81326fe15ec6da5f'
        'SKIP'
        '45e471912f742b68bd445a2d7d9f4026147c8f315712831e12096bf98f8777404acaada639b6ffd52efbe14ec2661dc8b72464990d8c6efc83c2f4f91a01850c'
        '8236310256459eb29f2f056972adc4e8cbcdfe034ac61c86d3931940f63e9d7c026020f7078cdb0445b8615c21f021400218f84cd583e2d13b6a6d6a23f08a18'
        '34e940c9ff679522cc5d0df9777ad3b5eaca8bc875c314179aa882fd8b54754672dbc8250708011c1a89ec4021713a1a3e3ae8487d4217929ea02dbd757696a6'
        '4d7cb398838de0d756c43a0c42dcd26eb88cc43a452e8f87bae665a10740f7d7743080d9112b8ac7dd4fd10fe51a7d90d5234302b795e8b5cc4a5105ee330570'
        '3a7867e77dfacabfd96e89a84c81ae6ce3d573e6fd5cf9f1634be0b7e8d846c85e5fc6c3015f314774705b52b27ec480a82c63b342bbff8bbb28612936f95ec1'
        'ec3964044f303732abaf7cd804eeef0aa1d5c90fbbaebbe58479e4c0a1620f185e88181a4f877f1f3eb0d81c6e74058d5960f2933af1edc50cbb5d5ef4ca2220'
        'fa7d3d6c1b0ed25a5ecb3d024b3293a4b2989da590f2bac4be82714fa4cf14a3964a07567a86279d2f1c1a89af385d24b325b1c2bf300448ff46928dff7dc5df'
        '1e6c45c4a5ea2846c3b311fb55eb8f869a2f39eef3fe00d02e77d3ceb8ade31cbbbb37edc796d2e690597c55fddfe5a42023b3d38d13f58d0fd9a0bd1ae18f29'
        '20674a8fcc0a85726e06460a7dbccfe731c46bf377cc3bf511b7591175e7df892f271bc1909e77d9a02913c753d241493502c5ab15d9f78e95f31aa4399c2c27'
        'b6ef77035611139fa9a6d5b8d30570e2781bb4da483bb569884b0bd0129b62e0b82a5a6776fefe43fee801c70d39de1ea4d4c177f7cedd5ac135e3c64f7b895a'
        'e94aa35d92cec92f4b0d487e0569790f3b712b9eaa5107f14a4200578e398ca740bf369f30f070c8beb56a72d1a6d0fc06beb650d798a64f44abe5e3af327728')

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

  # # kernel.org hasn't signed patches since 4.17.10
  # 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-mm-vmscan-fix-extreme-overreclaim-and-swap-floods.patch
  patch -p1 -i ../0003-soundwire-intel-Initialize-clock-stop-timeout.patch
  patch -p1 -i ../0004-drm-sched-add-DRM_SCHED_FENCE_DONT_PIPELINE-flag.patch
  patch -p1 -i ../0005-drm-amdgpu-use-DRM_SCHED_FENCE_DONT_PIPELINE-for-VM-.patch
  patch -p1 -i ../0006-drm-amdgpu-Fix-VRAM-BO-swap-issue.patch
  patch -p1 -i ../0007-drm-amdgpu-Fix-for-BO-move-issue.patch

  # graysky gcc patch
  echo "Applying graysky gcc patch"
  patch -p1 -i ../kernel_compiler_patch-${_gccpatchver}/more-uarches-for-kernel-${_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.previous ]; then
#      cp ${SRCDEST}/config.previous .config
#    fi
#  else
    cp ../config .config
#  fi

  echo "Cleaning up old and broken config settings..."
  make olddefconfig

  echo "Displaying diff between stock and updated config settings..."
  diff -u ../config .config || :

#  if [ "$_custom" == "1" ]; then
#    if [ -f $HOME/.config/modprobed.db ]; then
#      echo "Running make localmodconfig"
#      make LSMOD=$HOME/.config/modprobed.db localmodconfig
#    fi
#  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.previous
#  fi

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

build() {
  cd $_srcname
  make htmldocs all
}

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

  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 \
    DEPMOD=/doesnt/exist modules_install  # Suppress depmod

  # 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

  # https://bugs.archlinux.org/task/13146
  install -Dt "$builddir/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

  # https://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

  # https://bugs.archlinux.org/task/71392
  install -Dt "$builddir/drivers/iio/common/hid-sensors" -m644 drivers/iio/common/hid-sensors/*.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"
}

_package-docs() {
  pkgdesc="Documentation for the $pkgdesc kernel"

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

  echo "Installing documentation..."
  local src dst
  while read -rd '' src; do
    dst="${src#Documentation/}"
    dst="$builddir/Documentation/${dst#output/}"
    install -Dm644 "$src" "$dst"
  done < <(find Documentation -name '.*' -prune -o ! -type d -print0)

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

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