File PKGBUILD of Package linux-lts515

# Maintainer: Andreas Baumann <mail@andreasbaumann.cc>
# Contributor: Andreas Radke <andyrtr@archlinux.org>

pkgbase=linux-lts515
pkgname=("$pkgbase" "$pkgbase-headers" "$pkgbase-docs")
pkgver=$(ls -1 linux-5.15.*.tar.xz | head -n1 | sed 's/^linux-\(.*\)\.tar\.xz$/\1/')
pkgrel=1
pkgdesc='LTS Linux 5.15.x'
url="https://www.kernel.org/"
arch=(x86_64)
license=(GPL2)
makedepends=(
  obs-arch-config gnupg
  archlinux-keyring autoconf automake binutils bison debugedit fakeroot file findutils flex gawk gcc
  gettext grep groff gzip libtool m4 make pacman patch pkgconf sed sudo texinfo which gtk2
  bc kmod libelf pahole cpio perl tar xz
  xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick texlive-latexextra
)
options=('!strip')
_srcname=linux-$pkgver
source=(
  ${_srcname}.tar.{xz,sign}
  config         # the main kernel config file
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-PCI-Add-more-NVIDIA-controllers-to-the-MSI-masking-q.patch
  0003-iommu-intel-do-deep-dma-unmapping-to-avoid-kernel-fl.patch
  0004-Bluetooth-btintel-Fix-bdaddress-comparison-with-garb.patch
  0005-lg-laptop-Recognize-more-models.patch
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)
# https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
sha256sums=('SKIP'
            'SKIP'
            'af73117cdc123893b6c1339d826d3a09a3cbfb4e388793d795c8755462bec714'
            '3b5cfc9ca9cf778ea2c4b619b933cda26519969df2d764b5a687f63cf59974cd'
            '74ac466153f6cb61c24867d79bbacafc9d867ff27b4414f720f8ed40d53b2212'
            '8357f000b2b622e73dcfd41c2bad42b5e99fffe8f7ee64f774aa771f86cef43c'
            '5c1ee81fdd5818442af6081de987f9c1a9ce3c8d183566b3dfc19a8433aa3dde'
            '067e8995fcd6f6ed25e0253e9374c0e179a000c154da3e59ce62634945ac5be9')

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..."
  scripts/setlocalversion --save-scmversion
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "${pkgbase#linux}" > localversion.20-pkgname

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

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

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

build() {
  # Manually verify signature
  gpg --import /tmp/ABAF11C65A2970B130ABE3C479BE3E4300411886.asc
  gpg --import /tmp/647F28654894E3BD457199BE38DBBDC86092693E.asc
  xz -dc "${_srcname}.tar.xz" | gpg --verify "${_srcname}.tar.sign" - || exit 127
  cd $_srcname
  make -j$(nproc) 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=(wireguard-lts)

  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"
  depends=(pahole)

  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

  # required when DEBUG_INFO_BTF_MODULES is enabled
  install -Dt "$builddir/tools/bpf/resolve_btfids" tools/bpf/resolve_btfids/resolve_btfids

  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

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

if [ "${CARCH}" = "i486" -o  "${CARCH}" = "i686" -o "${CARCH}" = "pentium4" ]; then

  # use 32-bit configuration files per subarchitecture instead of main config file
  source_pentium4=('config.pentium4')
  source_i686=('config.i686')
  source_i486=('config.i486')
  # fail if upstream's .config changes
  for ((i=0; i<${#sha256sums[@]}; i++)); do
    if [ "${sha256sums[${i}]}" = 'af73117cdc123893b6c1339d826d3a09a3cbfb4e388793d795c8755462bec714' ]; then
      sha256sums_pentium4=('c760986aa56c02e8844326de9f8953fcbec501d68f7a93c96ce9727310b08575')
      sha256sums_i686=('16ccf97a203b7281527fcec7d499f7fbaf996251579e55b26474b61da4e50ca4')
      sha256sums_i486=('a2ca23ddf4eb0cb6f3e8676ee84ba8eaf97751dec5240be8993247251f6d6b3f')
    fi
  done

  # copy architecture specific config file, not default 'config'
  eval "$(
    declare -f prepare | \
      sed '
        s,\.\./config,../config.$CARCH,
      '
  )"

  # patch architecture when copying the kernel Makefile
  eval "$(
    declare -f package_linux-lts515-headers | \
      sed '
        \,/tools/objtool" ,d
        \,arch/x86/Makefile, {
          a \
          install -t "${builddir}/arch/x86" -m644 arch/x86/Makefile_32.cpu
        }
      '
  )"

  # avoid using zstd compression in ultra mode (exhausts virtual memory)
  source+=('no-ultra-zstd.patch')
  sha256sums+=('3997ce6033fdf950a9960f1db720b38c47b1a2e06ab75fc6712c154f596e7c47')
  # upstream prepare() does already do the *.patch patching

  # temporarily disabled documentation due to sphinx_rtd_theme (FS32#163)
  pkgname=(
    $(
      printf '%s\n' "${pkgname[@]}" | \
        grep -v '^\$pkgbase-docs'
    )
  )
  eval "$(
    declare -f build | \
      sed '
        s/\bhtmldocs\b//
      '
  )"
  makedepends=(${makedepends[@]//python-sphinx_rtd_theme/})
  makedepends=(${makedepends[@]//python-sphinx/})
  makedepends=(${makedepends[@]//graphviz/})
  makedepends=(${makedepends[@]//imagemagick/})
  makedepends=(${makedepends[@]//texlive-latexextra/})
fi