# Maintainer: Jan Alexander Steffens (heftig) <heftig@archlinux.org>

pkgbase=linux
pkgver=7.1.7.arch1
pkgrel=1
pkgdesc='Linux'
url='https://github.com/archlinux/linux'
arch=(
  x86_64
)
license=(GPL-2.0-only)
makedepends=(
  bc
  binutils
  cpio
  gettext
  glibc
  libelf
  libgcc
  openssl
  pahole
  perl
  python
  rust
  rust-bindgen
  rust-src
  tar
  xxhash
  xz
  zlib
  zstd

  # htmldocs
  graphviz
  imagemagick
  python-sphinx
  python-yaml
  texlive-latexextra
)
options=(
  !debug
  !strip
)
_srcname=linux-${pkgver%.*}
_srctag=v${pkgver%.*}-${pkgver##*.}
source=(
  https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/${_srcname}.tar.{xz,sign}
  $url/releases/download/$_srctag/linux-$_srctag.patch.zst{,.sig}
)
source_x86_64=(config.x86_64)
validpgpkeys=(
  ABAF11C65A2970B130ABE3C479BE3E4300411886 # Linus Torvalds
  647F28654894E3BD457199BE38DBBDC86092693E # Greg Kroah-Hartman
  83BC8889351B5DEBBB68416EB8AC08600F108CDF # Jan Alexander Steffens (heftig)
)
b2sums=('1a1884d4ac6e5b2a49b5f4835635c47b33552568a01b2cd65186a252da00e0578af2830c60a88208ec0834f718779815663dd7be148903b58f72e22ac8673e94'
  'SKIP'
  'f3c197f565e52a2b692798c0afcc2e783e504fe8fe34303c39ed50c374b81d98f8d4b38ef8e99cc37cd7ad9e7fa4d122a961b16b8cc20f80f8af6f59b3123aea'
  'SKIP')
b2sums_x86_64=('f40d27145e8c0961080cf0d9c219db937352e58cf06f844443a8951cd16d33c5f17f708b188454118fb5dc1a97492c39d6645d4f3a98dc0680fd5c949e17a3d3')

# https://www.kernel.org/pub/linux/kernel/v7.x/sha256sums.asc
sha256sums=('ca8f2a6884a4d62043e9ab93ac1ab15efc2b6630fe8f768b2ef2ffdf4b5e26df'
  'SKIP'
  '927ad110156cb3491defb466954b2ea543cdd7fb8b2d34681b8089b7fa38584b'
  'SKIP')

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

prepare() {
  cd $_srcname

  echo "Setting version..."
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "${pkgbase#linux}" > localversion.20-pkgname

  local src
  for src in "${source[@]}"; do
    src="${src%%::*}"
    src="${src##*/}"
    src="${src%.zst}"
    [[ $src = *.patch ]] || continue
    echo "Applying patch $src..."
    patch -Np1 < "../$src"
  done

  echo "Setting config..."
  cp ../config.$CARCH .config
  make olddefconfig
  diff -u ../config.$CARCH .config || :

  make -s kernelrelease > version
  echo "Prepared $pkgbase version $(< version)"
}

build() {
  cd $_srcname

  make htmldocs SPHINXOPTS=-QT &
  local pid_docs=$!

  make all
  make -C tools/bpf/bpftool vmlinux.h feature-clang-bpf-co-re=1
  wait $pid_docs
}

_package() {
  pkgdesc="The $pkgdesc kernel and modules"
  depends=(
    coreutils
    initramfs
    kmod
  )
  optdepends=(
    "$pkgbase-headers: headers and scripts for building modules"
    'linux-firmware: firmware images needed for some devices'
    'scx-scheds: to use sched-ext schedulers'
    'wireless-regdb: to set the correct wireless channels of your country'
  )
  provides=(
    KSMBD-MODULE
    NTSYNC-MODULE
    VIRTUALBOX-GUEST-MODULES
    WIREGUARD-MODULE
  )
  replaces=(
    virtualbox-guest-modules-arch
    wireguard-arch
  )

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

  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..."
  ZSTD_CLEVEL=19 make INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 \
    DEPMOD=/doesnt/exist modules_install # Suppress depmod

  # remove build link
  rm "$modulesdir"/build
}

_package-headers() {
  pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"
  depends=(
    binutils
    glibc
    libelf
    libgcc
    openssl
    pahole
    xxhash
    zlib
    zstd
  )
  provides=(LINUX-HEADERS)

  cd $_srcname
  local builddir="$pkgdir/usr/lib/modules/$(< version)/build"

  local karch
  case $CARCH in
    x86_64) karch=x86 ;;
    *)
      echo "Unknown CARCH $CARCH"
      exit 1
      ;;
  esac

  echo "Installing build files..."
  install -Dt "$builddir" -m644 .config Makefile Module.symvers System.map \
    localversion.* version vmlinux tools/bpf/bpftool/vmlinux.h
  install -Dt "$builddir/kernel" -m644 kernel/Makefile
  install -Dt "$builddir/arch/$karch" -m644 arch/$karch/Makefile
  cp -t "$builddir" -a scripts
  ln -srt "$builddir" "$builddir/scripts/gdb/vmlinux-gdb.py"

  if [[ $(scripts/config -s CONFIG_HAVE_STACK_VALIDATION) = y ]]; then
    install -Dt "$builddir/tools/objtool" tools/objtool/objtool
  fi

  if [[ $(scripts/config -s CONFIG_DEBUG_INFO_BTF_MODULES) = y ]]; then
    install -Dt "$builddir/tools/bpf/resolve_btfids" tools/bpf/resolve_btfids/resolve_btfids
  fi

  echo "Installing headers..."
  cp -t "$builddir" -a include
  cp -t "$builddir/arch/$karch" -a arch/$karch/include
  install -Dt "$builddir/arch/$karch/kernel" -m644 arch/$karch/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/{}" \;

  if [[ $(scripts/config -s CONFIG_RUST) = y ]]; then
    echo "Installing Rust files..."
    install -Dt "$builddir/rust" -m644 rust/*.rmeta
    install -Dt "$builddir/rust" rust/*.so
  fi

  echo "Installing unstripped VDSO..."
  make INSTALL_MOD_PATH="$pkgdir/usr" vdso_install \
    link= # Suppress build-id symlinks

  echo "Removing unneeded architectures..."
  local arch
  for arch in "$builddir"/arch/*/; do
    [[ $arch = */$karch/ ]] && 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 "$(file -Sib "$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 \( -name '.*' -o -name __pycache__ \) -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

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