# 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 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=17
_minver=15
_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/${_srcname}.tar.{xz,sign}
  config         # the main kernel config file
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0003-tick-Detect-and-fix-jiffies-update-stall.patch
  0004-tick-rcu-Remove-obsolete-rcu_needs_cpu-parameters.patch
  0005-tick-rcu-Stop-allowing-RCU_SOFTIRQ-in-idle.patch
  0006-lib-irq_poll-Declare-IRQ_POLL-softirq-vector-as-ksof.patch
  0007-NFSv4.1-provide-mount-option-to-toggle-trunking-disc.patch
  kernel_compiler_patch-${_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=('4a1c922a490eeabf5b44d4fde36de9ba5b71711b7352c6258716da41160db628'
            'SKIP'
            'c603b522eaf21f9a4e937645798bec4d6939eb5149b55fd487b87ca41454e108'
            '3e094bc2b28de53c8c26ba557cff29ec69f16c02267a8267e1e7c9bbedee0ea9'
            '020d88eca1a00ab22aa1ea9bb5cfd9aafde31a2768669bba5dba0d91a3d7c2f5'
            '8a51d80b784e5c82fd0b013912d8314f20fbc8a173aa8f90487c6163b0921034'
            '9ef50e453ff86e9f2764da1da1e5c04f644760fb10720a3626dacd211cdc9967'
            '9d0545aae770ecef3b5f3edcb2a1571f1badd730660e8724bde5a1c8bfd23b7e'
            '91faa68f2b5e06602d1bc16e05ea7fd8fcdc7332f3c880ea0869ddd8ee33171a'
            '5a29d172d442a3f31a402d7d306aaa292b0b5ea29139d05080a55e2425f48c5c'
            'e9e0d289170b7fb598b572d9c892ae8d1420952034aa415e8b3334f20a58edcc'
            '6ab863c8cfe6e0dd53a9d6455872fd4391508a8b97ab92e3f13558a6617b12a6')
b2sums=('14e42132958581b1d4ec01c9095d61ca5539ed894bf6c6eccf4a984cee496affe3a0f12383abbb1df46f55c1fcb667154ebf1f4f460f96b9d5166991bcb68a63'
        'SKIP'
        'f9b876591ae41bf7d92f610d8b9a29bd6ec53b2a3b88aa1bb5e51df9debc244b9a98c4c9b917e463be517c8e10675a46866604e19b3dbc415b779cf7428b3415'
        'b816ecce411841a40267cb00e8bcd2b95caf6295aa0a4af166499b46161c6573ea2935b8a3963c9721c24e8b5e346a24b044890ab9680f796c4a560227da2bc4'
        'b0bb82a64a3ebc7ef2dce75ab1fc1610d18021759e0064642d73a27371db77ac33dde4c54c998a82993d27c50fa8b05d89802ae42c636f79dba1d774ada07df8'
        'a7a30db59e126b4806f3302b110b0795f2d75d1448a44e5c00d778dfa4ea08df25f8a803d6b3a729167851c04ea965c07e2962e0df0d2e1f56a8e42b2118486b'
        '221f89858de17a5dfdc86189b1b356e19782913aee8f5c2a82431adee4ad5825b22980f74bb2cb505e03c8a1ca50aa42172c6ec4f9a1d4179bce760e3cf41402'
        '2471cbe682967da9336900508a2f8b8486ada696391efa5481bd7f2f9d5c075eecea5b895d5619337f046d8dbee99a95518811e243936bd3c6c106eee8fc44af'
        '67c1b98529472df062a2b64e0ceec3f597b3fc3519219dcc0afbf3060f624960fec10259ba7bfebcde1d0b7572190b41669a1bdf4377e855f4652595c64ab69e'
        '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 ../0003-tick-Detect-and-fix-jiffies-update-stall.patch
  patch -p1 -i ../0004-tick-rcu-Remove-obsolete-rcu_needs_cpu-parameters.patch
  patch -p1 -i ../0005-tick-rcu-Stop-allowing-RCU_SOFTIRQ-in-idle.patch
  patch -p1 -i ../0006-lib-irq_poll-Declare-IRQ_POLL-softirq-vector-as-ksof.patch
  patch -p1 -i ../0007-NFSv4.1-provide-mount-option-to-toggle-trunking-disc.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 \
    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