# Maintainer: Maximilian Luz <m@mxnluz.io>
# Maintainer: Blaž Hrastnik <blaz@mxxn.io>
# Maintainer: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>

pkgbase=linux-surface
pkgver=6.3.7.arch1
pkgrel=1
pkgdesc='Linux'
_shortver=${pkgver%.*}
_fullver=${pkgver%.*}-${pkgver##*.}
_srctag=v${_fullver}
url="https://github.com/archlinux/linux/commits/$_srctag"
arch=(x86_64)
license=(GPL2)
makedepends=(
  bc
  cpio
  gettext
  git
  libelf
  perl
  tar
  xz
  python
  # we don't need `pahole` as deps because we disable `CONFIG_DEBUG_INFO`
  # ignoring deps for docs because we don't build docs package
)
optdepends=('iptsd: Touchscreen support'
            'linux-firmware: Firmware files for Linux'
            'linux-firmware-marvell: Firmware files for Marvell WiFi / Bluetooth')
options=('!strip')
_srcname=archlinux-linux
source=(
  "$_srcname::git+https://github.com/archlinux/linux#tag=$_srctag"
  config         # the main kernel config file

  surface.config # surface specific options
  arch.config # config changes for linux-surface kernel
  0001-surface3-oemb.patch
  0002-mwifiex.patch
  0003-ath10k.patch
  0004-ipts.patch
  0005-ithc.patch
  0006-surface-sam.patch
  0007-surface-sam-over-hid.patch
  0008-surface-button.patch
  0009-surface-typecover.patch
  0010-surface-shutdown.patch
  0011-surface-gpe.patch
  0012-cameras.patch
  0013-amd-gpio.patch
  0014-rtc.patch
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
  'A2FF3A36AAA56654109064AB19802F8B0D70FC30'  # Jan Alexander Steffens (heftig)
)
sha256sums=('SKIP'
            '6b337a9d3cfdc00005589a80b8d36fa500f6a92ed21565a3aceec48d7202a7da'
            '65c28c44516a57d32d2d557bf6b9bcf38e00cefdf2b8ad51160eb07f53e6e998'
            '3cabe391cc39dbee88a79f76e9e7a68f7fbcd5518941aa2ab73a77692c87dead'
            '77144a2e5356c1fa045f64715a6f9be405ab74a29b896a03ac08e85068f0e148'
            'faf80ca671e9e468990e86b6090c64f9533c547599b08ccf2a9aa203eb8bcf40'
            'b33ad070fd3ac9c2f662e953e88d7e8ea5b83fb8f22268b348ffb47e83fd1c7c'
            'e4ff9c4392566dd4b9386b486aeb3bc0b126ecb9d06a0417878f769f8a8da7ac'
            '4b25d3fc14c7158fc7710b66074f6fc6e1934c0f10fbc9c309c57f76a0941330'
            '152d4f6104d327dac2eae2192890e8fc95f5fb255c311f6486fd302e7b88d10e'
            '4902ad5ce079ecc5522fd111d4da43c34f2a9c4e50a96b1b3470a44d69d432cd'
            '4af1861745d1f99b8a3c6ffa0912f0c9a55a1842317426f6e0292a84f54f98d8'
            '362a6769b7622b29c30f431968332a43041a222711840cdf4d5c1af4937ad80c'
            '2d3f48991b51d138d5848cae24dcd1c3dc60334e2f6881031515dd64755944f4'
            '92fb6e32b29cb4b874436c84411c4905315fdd75451cd00cbcbdf62e38b9b654'
            '19dc5a9d45f94ca1b1dfcb8affd29142c96fab8d5b2d18734b3fb015933404e9'
            'd3df979f633cd68a40d6f0c65f68afbf6435c841d871925c37b478c8446cbd5d'
            'cc7c86f89942b568b32e72830b4a51c39e4b119127e4a7449e52f8153c82a666')


export KBUILD_BUILD_HOST=archlinux
export KBUILD_BUILD_USER=$pkgbase
export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

# optional certificate and key for secure boot signing
_mok_crt="$PWD/MOK.crt"
_mok_key="$PWD/MOK.key"

_make() {
  test -s version
  make KERNELRELEASE="$(<version)" "$@"
}

prepare() {
  cd $_srcname

  echo "Setting version..."
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "${pkgbase#linux}" > localversion.20-pkgname
  make defconfig
  make -s kernelrelease > version
  make mrproper

  # setup git
  git config --local user.email "surfacebot@users.noreply.github.com"
  git config --local user.name "surfacebot"

  local src
  for src in "${source[@]}"; do
    src="${src%%::*}"
    src="${src##*/}"
    [[ $src = *.patch ]] || continue
    echo "Applying patch $src..."
    git am -3 "../$src"
  done

  echo "Setting config..."
  # cp ../config .config
  # merge the two configs together
  ./scripts/kconfig/merge_config.sh -m ../config ../surface.config ../arch.config
  _make olddefconfig

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

build() {
  cd $_srcname
  _make all
}

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

  cd $_srcname
  local modulesdir="$pkgdir/usr/lib/modules/$(<version)"
  local image_name="$(_make -s image_name)"

  # sign boot image if the prequisites are available
  if [[ -f "$_mok_crt" ]] && [[ -f "$_mok_key" ]] && [[ -x "$(command -v sbsign)" ]]; then
    echo "Signing boot image..."
    sbsign --key "$_mok_key" --cert "$_mok_crt" --output "$image_name" "$image_name"
  fi

  echo "Installing boot image..."
  # systemd expects to find the kernel here to allow hibernation
  # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
  install -Dm644 "$image_name" "$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 $pkgdesc kernel"
  depends=(pahole)
  provides=("linux-headers=${_shortver}")

  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

  # required when STACK_VALIDATION is enabled
  install -Dt "$builddir/tools/objtool" tools/objtool/objtool

  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

  # 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"
}

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

# vim:set ts=8 sts=2 sw=2 et: