# 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 eee
# Arch version does not disable HDCP
# Arch version does not disable IME/PSP and SGX/SEV and TXT/TEE and PXP
# Arch version uses git

# set _custom to 0 when using mkchrootpkg
_custom=0

pkgbase=linux
_supver=5
_majver=16
_minver=20
_gccpatchver='20220315'
_gccpatchker='5.15-5.16'
  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 kmod libelf pahole cpio perl tar xz
  xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick
)
conflicts=('linux-libre')
options=('!strip')
_srcname=linux-${pkgver}
source=(
  https://www.kernel.org/pub/linux/kernel/v${_supver}.x/${_srcname}.tar.{xz,sign}
  config         # the main kernel config file
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-Bluetooth-btintel-Fix-bdaddress-comparison-with-garb.patch
  0003-Bluetooth-Read-codec-capabilities-only-if-supported.patch
  0004-Bluetooth-fix-deadlock-for-RFCOMM-sk-state-change.patch
  0005-mt76-mt7921-add-support-for-PCIe-ID-0x0608-0x0616.patch
  0006-mt76-mt7921-reduce-log-severity-levels-for-informati.patch
  0007-Revert-NFSv4.1-query-for-fs_location-attr-on-a-new-f.patch
  kernel_compiler_patch-${_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=('d8060dc88f862baaae66b42a2dbc12298ed667c698eb5c55617a7786ee47bf25'
            'SKIP'
            '335cc2e5a617cf4dbd9973bd512cedeaa491718366395f97f3bd764e59a74cf8'
            '0ea6013565896bf9c77a3edb89d88ab1f6751c65545e1a0b28e2a895ae7a291d'
            'f101077e6b6196eefc187218c0c11308c87bdf779fd6fcf7e42111aa4d348ce7'
            '558e1e3426db12ac3ae6b9afdc361fe415d235e306e08e587b91a74b371c1002'
            'c8801d00c7f179730169b1065581cce89a3c9ddd553c4a813f039582e1bbe6be'
            '9a291b74a838a26b737e52415e4fb4fa27a69a252f94971208375cd02712f42f'
            'a918ccc4b339720679ca262fa08fbd1ad3f5a2c071cb06250e8ea8ed7d52acaa'
            '0953dcf941e3b979ab35551e670598dbfde098503e97925738bcb730892b90de'
            '5a29d172d442a3f31a402d7d306aaa292b0b5ea29139d05080a55e2425f48c5c'
            'e9e0d289170b7fb598b572d9c892ae8d1420952034aa415e8b3334f20a58edcc'
            '0f81d6e4158b7beeb0eb514f1b9401f7e23699cb0f7b0d513e25dae1815daaeb')
b2sums=('798baf7051b3f20d34741067769c6a59a04ba922468789e61ce5a6c4d0c3d336a0f3bacc9f482827722e7577828140772e5cbd76b844cc836d4d6b26e0c154ec'
        'SKIP'
        '1051ee98791aee9b9ea1ca5c5de35ce4863a2b10ba5af0b55b444e53abb010a9bd1ee0414598d0c6cdd55e4b258d8c63edc019abafe500bba92b5dddebdb055b'
        'f1e7205c4033abe680c5ddc9542a677f27b725f2d8b9b84133d877b1d60d5c373ed2873445202bdd7e15b6f56c96ffa2427fc1e36b485c25ae69907f486c4603'
        '1a2f35736e6066f20ee299cf1cc2efa9c76a9ebf3c17f0bc23b2852fe5618a82f87397187e3e0aa0b09ca9bea35ec0db8fbf28a6f6194d73a573a522ed4ce10d'
        '2a40fbad8386519b35397269cfb3a8f7dca3e7742e31f79553a129b3de478c89ea09684ea70cbbced3e157bd5df921e6712195e477e12467e729759232a4ebcc'
        '29bbe0deb754d03160690533229498f943cc542ef002035640950fa51d778c9188817f63d888fd07b45c6e24b4eec867fff3d8f81d1e3d766f240494ac88d3dd'
        '5272cfe0453d9ac59d3a5b092af66621f558b0137c3710b20a95c14ac58a7e260de906c3b265b427026fd1ed6e2bfdb54729883dbe183551b7e7243059945098'
        '2b9711e2085ed8b5d9fa440a751a7e31ec097383aeded739dbd8985c799b8a62e1e562f8af96692e33970fd2e463b87483af50a00adb1b98085210d080871fcf'
        '9a3f8a69dbd27d5e97c187362c6c8bfc9c4b8a7b60cca8d710ff93a0996e3e0d3dffe2e698a3bf430b57a9c83dc05ed4dedbd7b4fde440c1ab0eccfadf2ba16a'
        '20674a8fcc0a85726e06460a7dbccfe731c46bf377cc3bf511b7591175e7df892f271bc1909e77d9a02913c753d241493502c5ab15d9f78e95f31aa4399c2c27'
        '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

  # # 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-Bluetooth-btintel-Fix-bdaddress-comparison-with-garb.patch
  patch -p1 -i ../0003-Bluetooth-Read-codec-capabilities-only-if-supported.patch
  patch -p1 -i ../0004-Bluetooth-fix-deadlock-for-RFCOMM-sk-state-change.patch
  patch -p1 -i ../0005-mt76-mt7921-add-support-for-PCIe-ID-0x0608-0x0616.patch
  patch -p1 -i ../0006-mt76-mt7921-reduce-log-severity-levels-for-informati.patch
  patch -p1 -i ../0007-Revert-NFSv4.1-query-for-fs_location-attr-on-a-new-f.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 all
  make htmldocs
}

_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)
  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 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

  # 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