# Maintainer: jc_gargma <jc_gargma@iserlohn-fortress.net>
# Maintainer (Arch): Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
# Maintainer (Arch): Tobias Powalowski <tpowa@archlinux.org>
# Contributor (Arch): Thomas Baechler <thomas@archlinux.org>
# Contributor: Aqua-sama <aqua@iserlohn-fortress.net>

# # I maintain this because:
# Parabola version patch script does not apply consistently
# Parabola version lacks graysky gcc patch with bdver2 fix
# Parabola version lacks ath9k regdom and raid6 algo patches
# Parabola version allows SEED, SM3, SM4, and Streebog
# Parabola version is 300 Hz
# Parabola version supports Intel ME
# Parabola version is not configured for openrc
# Parabola version builds docs using python and graphviz

pkgbase=linux-libre
_majver=5.1
_minver=15
  if [ "$_minver" == "0" ]; then
    pkgver=${_majver}
  else
    pkgver=${_majver}.${_minver}
  fi
_gnumajver=${_majver}-gnu
_gnupkgver=${pkgver}-gnu
_gcc_more_v='20180509'
_srcname=linux-${_majver}
pkgrel=1
url='https://linux-libre.fsfla.org/'
arch=('x86_64')
license=('GPL2')
makedepends=('xmlto' 'kmod' 'inetutils' 'bc' 'libelf')
conflicts=('linux')
options=('!strip')
source=(
        https://linux-libre.fsfla.org/pub/linux-libre/releases/${_gnumajver}/linux-libre-${_gnumajver}.tar.xz{,.sign}
        https://linux-libre.fsfla.org/pub/linux-libre/releases/${_gnupkgver}/patch-${_gnumajver}-${_gnupkgver}.xz{,.sign}
        0001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by.patch
        0002-ZEN-Add-CONFIG-for-unprivileged_userns_clone.patch
        graysky_bdver2-hotfix.patch
        enable_additional_cpu_optimizations-$_gcc_more_v.tar.gz::https://github.com/graysky2/kernel_gcc_patch/archive/$_gcc_more_v.tar.gz
        ath9k-regdom-hack.patch
        raid6-default-algo.patch
        config.x86_64  # the main kernel config files
        60-linux.hook  # pacman hook for depmod
        90-linux.hook  # pacman hook for initramfs regeneration
        linux.preset   # standard config files for mkinitcpio ramdisk
       )
sha512sums=('42510bffa69746e0f919fecef5a23da4adb2473239ee67730fa1eb2340256fb4618c6acab439c01ae781df768a2e1ac4b76ad80fe0e4a432eaceb7f01f275439'
            'SKIP'
            '96a64bbfae14b76eac42f9755a53278d2abf3c8696586be8f3ae3f2f4a477bd89ae7bdfaa0eda588f304f1d8215a0e63e7591c290c61d3878ac2a75ec68ba518'
            'SKIP'
            '81a57ab537da498800475d1b30d2d067e06325486e7f19aab713c4bab211a7caaf63b85e1c761646eb945c40b6a0b917eeb2be9e58c8a6d9f730e5b25bb982b8'
            '32a95975fd933c2fe25a54b2fd7d6533d7adcc3c7a607159b4625020907af3d632c5b5f457b8c359669dbd19e77bf14348731a5385e10fc94471ad2a1b9a4ceb'
            '5ec8f3ef9c4467a99ae9c5350d0cc82fcf4ed78064ae732805d348053655b9ac8217ee2bfe301918634110cab14d85f58b8422e41e328f2ac77921ae8ec3a770'
            'a0f37a9b8dbd11f8ef4450b06afee0a6e5519cb5a5cd78f84896812b007ef645bcb9c733ae9817c24d1f4a4c2114258015abceb5a94c7e08d2bb00531a6f04c7'
            '905beb3f47cccb161e1ee74f8d5ba324b7c2f72e86246d941dfb18c85ace9d32df1966b52d2be2e3ff1ebea74af3b868422aec5a3eebc29858ee9e7207dea226'
            'd6bec327f4f2c69f2fc2780d90cd5d057bc5e32b39e54a13fccb1f5a880a148fa322e54c372e38d3f453d06fd9ab54d653265f355bd61e08a416058bd4224167'
            '908533eb3479c1d0c0859e0b8e116f26694093d0014ac08b380946f27ccdd0f4ce8b7763199b87a75d137d3c380fbbc847041b33c1279bfb384ccefff8f44af8'
            '7ad5be75ee422dda3b80edd2eb614d8a9181e2c8228cd68b3881e2fb95953bf2dea6cbe7900ce1013c9de89b2802574b7b24869fc5d7a95d3cc3112c4d27063a'
            '4a8b324aee4cccf3a512ad04ce1a272d14e5b05c8de90feb82075f55ea3845948d817e1b0c6f298f5816834ddd3e5ce0a0e2619866289f3c1ab8fd2f35f04f44'
            '2dc6b0ba8f7dbf19d2446c5c5f1823587de89f4e28e9595937dd51a87755099656f2acec50e3e2546ea633ad1bfd1c722e0c2b91eef1d609103d8abdc0a7cbaf')
validpgpkeys=(
              '474402C8C582DAFBE389C427BCB7CF877E7D47A7' # Alexandre Oliva
             )

_kernelname=${pkgbase#linux-libre}

prepare() {
  cd $_srcname

  # add upstream patch
  if [ "$_minver" != "0" ]; then
    msg2 "Applying upstream patch"
    patch -Np1 < ../patch-${_gnumajver}-${_gnupkgver}
  fi

  # Hotfixes
  msg2 "Applying hotfixes"
  patch -p1 -i ../0001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by.patch
  patch -p1 -i ../0002-ZEN-Add-CONFIG-for-unprivileged_userns_clone.patch


  # graysky gcc hotfixes
  msg2 "Applying graysky gcc patch hotfixes"
  patch -p1 -i ../graysky_bdver2-hotfix.patch "$srcdir/kernel_gcc_patch-${_gcc_more_v}/enable_additional_cpu_optimizations_for_gcc_v8.1+_kernel_v4.13+.patch"

  # graysky gcc patch
  msg2 "Applying graysky cpu patch"
  patch -p1 -i ../kernel_gcc_patch-${_gcc_more_v}/enable_additional_cpu_optimizations_for_gcc_v8.1+_kernel_v4.13+.patch


  # Ignore ath9k eeprom patch
  msg2 "Applying ath9k patch"
  patch -p1 -i ../ath9k-regdom-hack.patch

  # Set default raid6 algo patch
  msg2 " Applying raid6 patch"
  patch -p1 -i ../raid6-default-algo.patch


  msg2 "Setting version..."
  sed -e "/^EXTRAVERSION =/s/=.*/= /" -i Makefile
  scripts/setlocalversion --save-scmversion
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "-libre$_kernelname" > localversion.20-pkgname


  msg2 "Setting config..."
  # we are in src/linux-x.yy.zz, looking for a config next to the pkgbuild
#  if [ -f ${SRCDEST}/config.libre.previous ]; then
#    cp ${SRCDEST}/config.libre.previous .config
#  else
    cp ../config.x86_64 .config
#  fi

  make olddefconfig

#  make menuconfig

  # 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
#  msg2 "Backing up config..."
#  cp .config ${SRCDEST}/config.libre.previous

  msg2 "Prepared %s version %s" "$pkgbase" "$(<../version)"
}

build() {
  cd $_srcname
  make bzImage modules
}

_package() {
  pkgdesc="The ${pkgbase/linux/Linux} kernel and modules"
  [[ ${pkgbase} = linux-libre ]] && groups=(base)
  depends=(coreutils linux-libre-firmware kmod mkinitcpio)
  optdepends=('crda: to set the correct wireless channels of your country')
  backup=("etc/mkinitcpio.d/$pkgbase.preset")
  install=linux.install

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

  cd $_srcname

  msg2 "Installing boot image..."
  install -Dm644 "$(make -s image_name)" "$pkgdir/boot/vmlinuz-$pkgbase"

  msg2 "Installing modules..."
  mkdir -p "$modulesdir"
  make INSTALL_MOD_PATH="$pkgdir/usr" modules_install

  # a place for external modules,
  # with version file for building modules and running depmod from hook
  local extramodules="extramodules$_kernelname"
  local extradir="$pkgdir/usr/lib/modules/$extramodules"
  install -Dt "$extradir" -m644 ../version
  ln -sr "$extradir" "$modulesdir/extramodules"

  # remove build and source links
  rm "$modulesdir"/{source,build}

  msg2 "Installing hooks..."
  # sed expression for following substitutions
  local subst="
    s|%PKGBASE%|$pkgbase|g
    s|%KERNVER%|$kernver|g
    s|%EXTRAMODULES%|$extramodules|g
  "

  # hack to allow specifying an initially nonexisting install file
  sed "$subst" "$startdir/$install" > "$startdir/$install.pkg"
  true && install=$install.pkg

  # fill in mkinitcpio preset and pacman hooks
  sed "$subst" ../linux.preset | install -Dm644 /dev/stdin \
    "$pkgdir/etc/mkinitcpio.d/$pkgbase.preset"
  sed "$subst" ../60-linux.hook | install -Dm644 /dev/stdin \
    "$pkgdir/usr/share/libalpm/hooks/60-$pkgbase.hook"
  sed "$subst" ../90-linux.hook | install -Dm644 /dev/stdin \
    "$pkgdir/usr/share/libalpm/hooks/90-$pkgbase.hook"

  msg2 "Fixing permissions..."
  chmod -Rc u=rwX,go=rX "$pkgdir"
}

_package-headers() {
  pkgdesc="Header files and scripts for building modules for ${pkgbase/linux/Linux} kernel"

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

  cd $_srcname

  msg2 "Installing build files..."
  install -Dt "$builddir" -m644 Makefile .config Module.symvers System.map vmlinux
  install -Dt "$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}

  # ???
  mkdir "$builddir/.tmp_versions"

  msg2 "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

  msg2 "Installing KConfig files..."
  find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

  msg2 "Removing unneeded architectures..."
  local arch
  for arch in "$builddir"/arch/*/; do
    [[ $arch = */x86/ ]] && continue
    echo "Removing $(basename "$arch")"
    rm -r "$arch"
  done

  msg2 "Removing documentation..."
  rm -r "$builddir/Documentation"

  msg2 "Removing broken symlinks..."
  find -L "$builddir" -type l -printf 'Removing %P\n' -delete

  msg2 "Removing loose objects..."
  find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

  msg2 "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)

  msg2 "Adding symlink..."
  mkdir -p "$pkgdir/usr/src"
  ln -sr "$builddir" "$pkgdir/usr/src/$pkgbase-$pkgver"

  msg2 "Fixing permissions..."
  chmod -Rc u=rwX,go=rX "$pkgdir"
}

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