# Kernel intended for ClockworkPi from ak-rex

buildarch=8

pkgbase=linux-clockworkpi-git
_srcname=linux-clockworkpi
_kernelname=${pkgbase#linux}
_desc="for ClockworkPi uConsole / DevTerm, ak-rex source tree"
_branch=rpi-6.12.y
pkgver=6.12.35.r1320412.202507062304.04717ed
pkgrel=1
epoch=1
arch=('aarch64')
url="http://www.kernel.org/"
license=('GPL2')
makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc' 'git' 'dtc')
options=('!strip')
source=("$_srcname::git+https://github.com/ak-rex/ClockworkPi-linux#branch=$_branch"
	'cm5-virtual-hp-widget.patch'
        'linux.preset')
md5sums=('SKIP'
         '383daf4826ffdfa0bc995a4007fdead7'
         '4b6d890230b6751e375ed7d2e34cdb56')

pkgver() {
  cd "$srcdir/$_srcname"
  local version=$(grep -m 1 VERSION Makefile | sed 's/^.*= //g')
  local patchlevel=$(grep -m 1 PATCHLEVEL Makefile | sed 's/^.*= //g')
  local sublevel=$(grep -m 1 SUBLEVEL Makefile | sed 's/^.*= //g')
  printf "%s.%s.%s.r%s.%s.%s" "$version" "$patchlevel" "$sublevel" "$(git rev-list --count HEAD)" "$(date +%Y%m%d%H%M)" "$(git rev-parse --short=7 HEAD)"
}

prepare() {
  cd $_srcname

  for p in $(find ../ -name '*.patch'); do
    git apply -3 "$p"
  done

  echo "Setting version..."
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "-$(git rev-parse --short=7 HEAD)" > localversion.11-commit
  echo "${pkgbase#linux}" > localversion.20-pkgname

  # Generate config from defconfig
  # Use bcm2711 for both CM4/CM5 support. bcm2712 is 16k
  # and only works on CM5.
  make bcm2711_defconfig
}

build() {
  cd ${_srcname}

  # get kernel version
  make prepare
  make -s kernelrelease > version

  # build!
  unset LDFLAGS
  make ${MAKEFLAGS} Image modules
  # Generate device tree blobs with symbols to support applying device tree overlays in U-Boot
  make ${MAKEFLAGS} DTC_FLAGS="-@" dtbs
}

_package() {
  pkgdesc="The Linux Kernel and modules - ${_desc}"
  depends=('coreutils' 'linux-firmware-broadcom' 'kmod' 'mkinitcpio>=0.7')
  optdepends=('wireless-regdb: to set the correct wireless channels of your country')
  provides=("linux=${pkgver}" "KSMBD-MODULE" "WIREGUARD-MODULE")
  conflicts=('linux')
  install=${pkgname}.install

  cd $_srcname
  local kernver="$(<version)"
  local modulesdir="$pkgdir/usr/lib/modules/$kernver"

  echo "Installing boot image and dtbs..."
  install -Dm644 arch/arm64/boot/Image "${pkgdir}/boot/vmlinuz-${pkgbase}"
  make INSTALL_DTBS_PATH="${pkgdir}/boot/" dtbs_install
  find "${pkgdir}/boot/broadcom" -type f -print0 | xargs -0 mv -t "${pkgdir}/boot"
  rm -rf "${pkgdir}/boot/broadcom"

  echo "Installing modules..."
  make INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 DEPMOD=/doesnt/exist modules_install

  # remove build link
  rm "$modulesdir"/build

  # sed expression for following substitutions
  local _subst="
    s|%PKGBASE%|${pkgbase}|g
    s|%KERNVER%|${kernver}|g
  "

  # install mkinitcpio preset file
  sed "${_subst}" ../linux.preset |
    install -Dm644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # rather than use another hook (90-linux.hook) rely on mkinitcpio's 90-mkinitcpio-install.hook
  # which avoids a double run of mkinitcpio that can occur
  install -d "${pkgdir}/usr/lib/initcpio/"
  echo "dummy file to trigger mkinitcpio to run" > "${pkgdir}/usr/lib/initcpio/$(<version)"
}

_package-headers() {
  pkgdesc="Header files and scripts for building modules for linux kernel - ${_desc}"
  provides=("linux-headers=${pkgver}")
  conflicts=('linux-headers')

  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 "$builddir/arch/arm64" -m644 arch/arm64/Makefile
  cp -t "$builddir" -a scripts

  # 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/arm64" -a arch/arm64/include
  install -Dt "$builddir/arch/arm64/kernel" -m644 arch/arm64/kernel/asm-offsets.s
  mkdir -p "$builddir/arch/arm"
  cp -t "$builddir/arch/arm" -a arch/arm/include

  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 = */arm64/ || $arch == */arm/ ]] && 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 "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}() {
    _package${_p#${pkgbase}}
  }"
done