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+# 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>
+# Maintainer (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 ath9k and greysky2 patches
+# Parabola version allows SM3 and SM4
+# 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
+# Parabola version is out-of-date
+# Parabola version disables modules for components that lack free firmware
+
+pkgbase=linux-libre
+_majver=4.20
+_minver=4
+pkgver=${_majver}.${_minver}
+_gnumajver=${_majver}-gnu
+_gnupkgver=${pkgver}-gnu
+_gcc_more_v='20180509'
+_srcname=linux-${pkgver}
+pkgrel=1
+url='https://linux-libre.fsfla.org/'
+arch=('x86_64')
+license=('GPL2')
+makedepends=('xmlto' 'kmod' 'inetutils' 'bc' 'libelf')
+conflicts=('linux')
+options=('!strip')
+source=(https://linux-libre.fsfla.org/pub/linux-libre/releases/${_gnumajver}/linux-libre-${_gnumajver}.tar.xz{,.sign}
+        https://linux-libre.fsfla.org/pub/linux-libre/releases/${_gnupkgver}/patch-${_gnumajver}-${_gnupkgver}.xz{,.sign}
+        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
+        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=('a4a0a25fd490c051deb32ff84ba51e8807bfc8db1ad46c22c7807e9be2e5db5e1c22c211e47fca2509d5d75d64626fb28e9bbc8ccadc565f27fe9c8e47e12dc4'
+            'SKIP'
+            '65ba7da382356a25680ff62a9cb0d59afe30254f9e84ce92e48d630c81c082686d5dd5e2027bd8bf9f2e87f8aa05f07c992a3b3d70bd66e0d3476df5cc5b903b'
+            'SKIP'
+            'a0f37a9b8dbd11f8ef4450b06afee0a6e5519cb5a5cd78f84896812b007ef645bcb9c733ae9817c24d1f4a4c2114258015abceb5a94c7e08d2bb00531a6f04c7'
+            '905beb3f47cccb161e1ee74f8d5ba324b7c2f72e86246d941dfb18c85ace9d32df1966b52d2be2e3ff1ebea74af3b868422aec5a3eebc29858ee9e7207dea226'
+            '068d6ce4ea72955a1cbdd1d4ba6361a8d4e0e74b56651995e1602c8e62255b7b6e65abe51dc5256d97324ecf56b92f4c1e9cdd20e12914a95820b1058961707c'
+            '7ad5be75ee422dda3b80edd2eb614d8a9181e2c8228cd68b3881e2fb95953bf2dea6cbe7900ce1013c9de89b2802574b7b24869fc5d7a95d3cc3112c4d27063a'
+            '4a8b324aee4cccf3a512ad04ce1a272d14e5b05c8de90feb82075f55ea3845948d817e1b0c6f298f5816834ddd3e5ce0a0e2619866289f3c1ab8fd2f35f04f44'
+            '2dc6b0ba8f7dbf19d2446c5c5f1823587de89f4e28e9595937dd51a87755099656f2acec50e3e2546ea633ad1bfd1c722e0c2b91eef1d609103d8abdc0a7cbaf')
+validpgpkeys=(
+              '474402C8C582DAFBE389C427BCB7CF877E7D47A7' # Alexandre Oliva
+             )
+
+_kernelname=${pkgbase#linux-libre}
+
+prepare() {
+  cd $_srcname
+
+  # add upstream patch
+  msg2 "Applying upstream patch"
+  patch -Np1 < ../patch-${_gnumajver}-${_gnupkgver}
+
+  # Hotfixes
+  # msg2 "Applying hotfixes"
+
+  # graysky2 gcc patch
+  msg2 "Applying graysky2 cpu patch"
+  patch -p1 -i ../kernel_gcc_patch-${_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
+
+
+  msg2 "Setting version..."
+  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 ${SRCDEST}/config.libre.previous .config
+  #else
+    cp ../config.x86_64 .config
+  #fi
+  make olddefconfig
+
+  make menuconfig
+
+  # Remove sublevel when no sublevel exists
+#   sed -i '/SUBLEVEL = 0/d' Makefile
+
+  make -s kernelrelease > ../version
+
+  # workaround for make -s kernelrelease not applying
+  # localversion to version when changed using menuconfig
+  grep -Po '(?<=CONFIG_LOCALVERSION=").*(?=")' .config > ../localversion
+  echo "$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 $_srcname
+
+  msg2 "Installing boot image..."
+  install -Dm600 "$(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
+
+# vim:set ts=8 sts=2 sw=2 et: