# 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=5
_majver=19
_minver=11
_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/${_srcname}.tar.{xz,sign}
  config         # the main kernel config file
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-drm-i915-psr-Use-full-update-In-case-of-area-calcula.patch
  0003-drm-i915-Ensure-damage-clip-area-is-within-pipe-area.patch
  0004-mm-vmscan-fix-extreme-overreclaim-and-swap-floods.patch
  0005-soundwire-intel-use-pm_runtime_resume-on-component-p.patch
  0006-Bluetooth-fix-deadlock-for-RFCOMM-sk-state-change.patch
  0007-ASoC-Intel-sof_sdw-add-support-for-Dell-SKU-0AFF.patch
  0008-ACPI-processor-idle-Practically-limit-Dummy-wait-wor.patch
  kernel_compiler_patch-${_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=('5554d2f90b806bb3454fcf3432882cf85077d660a89db5a4e8d7375271e3d973'
            'SKIP'
            '9c432835f1946ae193f59a2bb31fe1710fc3c19a155e076c61ce8d5c67716085'
            '4b4443e95c64039fc98a2392fdab3e0df557c27b63581962543b3651346346b0'
            'd909326586744610423dbf2ac17728175b40c910a22dc5a0342adbc8b15b7f3a'
            'd3d1231ed81853f7d84db4e148bcc7febc8e98abdb588c798604daf56871a640'
            '5bff39351bb5afab1c21b61c25a1b4cb133c34d3519620253418193bda98d010'
            'b97948d26d2d99d92b35493c49a27a0e4725fbb74a3b7ff46e349e88a292afbd'
            '52d076504169cd96e01cffb5e4fd8880c618533ada1784dc965555a9a08860a4'
            'ffcb6b3a238f50ab3757a218d7ac5027aada8bfaf1be8a11aa74cc052337cf97'
            '10ae1955e09d7298662c55ab58e4e6349a4ddba4dd6774452a717fb7226d0acb'
            '5a29d172d442a3f31a402d7d306aaa292b0b5ea29139d05080a55e2425f48c5c'
            'e9e0d289170b7fb598b572d9c892ae8d1420952034aa415e8b3334f20a58edcc'
            '6ab863c8cfe6e0dd53a9d6455872fd4391508a8b97ab92e3f13558a6617b12a6')
b2sums=('0927f0dd0f7ca5382c4740ebfe55eb6ba6f9a9f16cc68a6dbe303644950035a6a145534c57577b60f00009069cbe35c4019807334e742602a0946f28c6cde850'
        'SKIP'
        'db611718464698e8dcc5332d441e0a807b5d6bb42c609b453035a1230b05ee5d7a7cef36a3c3477e389527cf816f645d582f43a50442d66692fe3a5e8a410c69'
        'ba48cbf26b449bee0394f491849b929fd955df6aaa504b619d2a8ebbea7085717bc6a76b106eaefc54d981987793ca3e520b61aeb4e6d1357ffb0aca8aabc33d'
        '50c44ad5880a477e43ca39954ebcbc24971c480aa1ecac7c8a2ce7c84857e11a7e59b39ecf8d63efe45fba5ebaf8987bb76952e4c0e6eb977d5fe82cc78be8f0'
        '23c6e8ee7a7aca32411aef56f4d63c5a22934ffba7644ae3a3259388696c0e65df17ccc30a3f507742566773292412204c356e4d2afc0a332794c39549169b05'
        'aab9f39c76e174b4f441c25502d5154f992dccd555f29e3fff16272d3e6f3607fd3469d19b77b537973ec100b00629be4a8bc0d76fc2dcd5dd411d9a5bf3884b'
        'd41d495c99766c88d8efbe973d7fb8093d3277902eadb5d68c558729cb036d652a33a8cbadf5700eb5837122ada0353f27c0b5f267311e3531e11d311d926fac'
        'c5c66c6616300306592f0a8e0710c57ee836e76a3afe1816d71199eaad738c1b8c80a95f0c5b51f120ed9c9d7f4c26325400bac456c108590448759cb758b77b'
        '8cd270a3446b8eb6079999582872c55642cacfb80cd1ad97aeb667c29df08960e2ef679e8b6e6ce650cb5fdf029d1772a71583acdd8b58a803397fb2d644dc83'
        '8833a51dd07694078e8781852a8ba34fb81a21b3554d1f1f23778071877462464558426384024715348deec86c41ed20c86896dff4aa87e04b584a97162cbf46'
        '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-drm-i915-psr-Use-full-update-In-case-of-area-calcula.patch
  patch -p1 -i ../0003-drm-i915-Ensure-damage-clip-area-is-within-pipe-area.patch
  patch -p1 -i ../0004-mm-vmscan-fix-extreme-overreclaim-and-swap-floods.patch
  patch -p1 -i ../0005-soundwire-intel-use-pm_runtime_resume-on-component-p.patch
  patch -p1 -i ../0006-Bluetooth-fix-deadlock-for-RFCOMM-sk-state-change.patch
  patch -p1 -i ../0007-ASoC-Intel-sof_sdw-add-support-for-Dell-SKU-0AFF.patch
  patch -p1 -i ../0008-ACPI-processor-idle-Practically-limit-Dummy-wait-wor.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