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+# Maintainer: Joan Figueras <ffigue at gmail dot com>
+# Contributor: Torge Matthies <openglfreak at googlemail dot com>
+# Contributor: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
+# Contributor: Yoshi2889 <rick.2889 at gmail dot com>
+# Contributor: Tobias Powalowski <tpowa@archlinux.org>
+# Contributor: Thomas Baechler <thomas@archlinux.org>
+
+##
+## The following variables can be customized at build time. Use env or export to change at your wish
+##
+##   Example: env _microarchitecture=25 use_numa=n use_tracers=n use_pds=n makepkg -sc
+##
+## Look inside 'choose-gcc-optimization.sh' to choose your microarchitecture
+## Valid numbers between: 0 to 42
+## Default is: 0 => generic
+## Good option if your package is for one machine: 42 => native
+if [ -z ${_microarchitecture+x} ]; then
+  _microarchitecture=0
+fi
+
+## Disable NUMA since most users do not have multiple processors. Breaks CUDA/NvEnc.
+## Archlinux and Xanmod enable it by default.
+## Set variable "use_numa" to: n to disable (possibly increase performance)
+##                             y to enable  (stock default)
+if [ -z ${use_numa+x} ]; then
+  use_numa=y
+fi
+
+## For performance you can disable FUNCTION_TRACER/GRAPH_TRACER. Limits debugging and analyzing of the kernel.
+## Stock Archlinux and Xanmod have this enabled. 
+## Set variable "use_tracers" to: n to disable (possibly increase performance)
+##                                y to enable  (stock default)
+if [ -z ${use_tracers+x} ]; then
+  use_tracers=y
+fi
+
+## Enable PDS CPU scheduler by default https://gitlab.com/alfredchen/linux-pds
+## Set variable "use_pds" to: n to disable (stock Xanmod)
+##                            y to enable
+if [ -z ${use_pds+x} ]; then
+  use_pds=n
+fi
+
+## Enable CONFIG_USER_NS_UNPRIVILEGED flag https://aur.archlinux.org/cgit/aur.git/tree/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch?h=linux-ck
+## Set variable "use_ns" to: n to disable (stock Xanmod)
+##                           y to enable (stock Archlinux)
+if [ -z ${use_ns+x} ]; then
+  use_ns=n
+fi
+
+# Compile ONLY used modules to VASTLYreduce the number of modules built
+# and the build time.
+#
+# To keep track of which modules are needed for your specific system/hardware,
+# give module_db script a try: https://aur.archlinux.org/packages/modprobed-db
+# This PKGBUILD read the database kept if it exists
+#
+# More at this wiki page ---> https://wiki.archlinux.org/index.php/Modprobed-db
+if [ -z ${_localmodcfg} ]; then
+  _localmodcfg=n
+fi
+
+# Tweak kernel options prior to a build via nconfig
+_makenconfig=
+
+### IMPORTANT: Do no edit below this line unless you know what you're doing
+
+pkgbase=linux-xanmod-anbox
+pkgver=5.8.1
+_major=5.8
+_branch=5.x
+xanmod=1
+pkgrel=${xanmod}
+pkgdesc='Linux Xanmod with ashmem and binder enabled for Anbox'
+url="http://www.xanmod.org/"
+arch=(x86_64)
+
+license=(GPL2)
+makedepends=(
+  xmlto kmod inetutils bc libelf cpio
+  python-sphinx python-sphinx_rtd_theme graphviz imagemagick
+)
+options=('!strip')
+_srcname="linux-${pkgver}-xanmod${xanmod}"
+
+source=("https://cdn.kernel.org/pub/linux/kernel/v${_branch}/linux-${_major}.tar."{xz,sign}
+        "https://github.com/xanmod/linux/releases/download/${pkgver}-xanmod${xanmod}/patch-${pkgver}-xanmod${xanmod}.xz"
+        choose-gcc-optimization.sh
+        '0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch::https://aur.archlinux.org/cgit/aur.git/plain/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch?h=linux-ck&id=616ec1bb1f2c0fc42b6fb5c20995996897b4f43b')
+validpgpkeys=(
+    'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linux Torvalds
+    '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
+)
+
+# Archlinux patches
+_commits=""
+for _patch in $_commits; do
+    source+=("${_patch}.patch::https://git.archlinux.org/linux.git/patch/?id=${_patch}")
+done
+    
+
+sha256sums=('e7f75186aa0642114af8f19d99559937300ca27acaf7451b36d4f9b0f85cf1f5'
+            'SKIP'
+            'a6818ddb680d60af84ccbd3edb0156d5ff87dc29c6727207dc54d12512aec77e'
+            '2c7369218e81dee86f8ac15bda741b9bb34fa9cefcb087760242277a8207d511'
+            '6c66dba73251440352f93ff32b72f5dd49536d0f17ef9347867660fd3a626991')
+
+export KBUILD_BUILD_HOST=${KBUILD_BUILD_HOST:-archlinux}
+export KBUILD_BUILD_USER=${KBUILD_BUILD_USER:-makepkg}
+export KBUILD_BUILD_TIMESTAMP=${KBUILD_BUILD_TIMESTAMP:-$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})}
+
+prepare() {
+  cd linux-${_major}
+
+  # Apply Xanmod patch
+  patch -Np1 -i ../patch-${pkgver}-xanmod${xanmod}
+
+  msg2 "Setting version..."
+  scripts/setlocalversion --save-scmversion
+  echo "-$pkgrel" > localversion.10-pkgrel
+  echo "${pkgbase#linux}" > localversion.20-pkgname
+
+  # Archlinux patches
+  local src
+  for src in "${source[@]}"; do
+    src="${src%%::*}"
+    src="${src##*/}"
+    [[ $src = *.patch ]] || continue
+    msg2 "Applying patch $src..."
+    patch -Np1 < "../$src"
+  done
+
+  # CONFIG_STACK_VALIDATION gives better stack traces. Also is enabled in all official kernel packages by Archlinux team
+  scripts/config --enable CONFIG_STACK_VALIDATION
+
+  # Anbox compatibility
+  msg2 "Enabling ashmem and binder modules"
+  scripts/config --enable CONFIG_ASHMEM
+  scripts/config --enable CONFIG_ANDROID
+  scripts/config --enable CONFIG_ANDROID_BINDER_IPC
+  scripts/config --enable CONFIG_ANDROID_BINDERFS
+  scripts/config --set-str CONFIG_ANDROID_BINDER_DEVICES "binder,hwbinder,vndbinder"
+
+  # Enable IKCONFIG following Arch's philosophy
+  scripts/config --enable CONFIG_IKCONFIG \
+                 --enable CONFIG_IKCONFIG_PROC
+
+  # User set. See at the top of this file
+  if [ "$use_tracers" = "n" ]; then
+    msg2 "Disabling FUNCTION_TRACER/GRAPH_TRACER..."
+    scripts/config --disable CONFIG_FUNCTION_TRACER \
+                   --disable CONFIG_STACK_TRACER
+  fi
+
+  if [ "$use_numa" = "n" ]; then
+    msg2 "Disabling NUMA..."
+    scripts/config --disable CONFIG_NUMA
+  fi
+
+  if [ "$use_pds" = "y" ]; then
+    msg2 "Enabling PDS CPU scheduler by default..."
+    scripts/config --enable CONFIG_SCHED_PDS
+  fi
+
+  if [ "$use_ns" = "n" ]; then
+    msg2 "Disabling CONFIG_USER_NS_UNPRIVILEGED"
+    scripts/config --disable CONFIG_USER_NS_UNPRIVILEGED
+  fi
+
+  # Let's user choose microarchitecture optimization in GCC
+  sh ${srcdir}/choose-gcc-optimization.sh $_microarchitecture
+
+  # This is intended for the people that want to build this package with their own config
+  # Put the file "myconfig" at the package folder to use this feature
+  # If it's a full config, will be replaced
+  # If not, you should use scripts/config commands, one by line
+  if [ -f "${startdir}/myconfig" ]; then
+    if [ $(wc -l < "${startdir}/myconfig") -gt 1000 ]; then
+      # myconfig is a full config file. Replace it
+      msg2 "Using user CUSTOM config..."
+      cp -f "${startdir}"/myconfig .config
+    else
+      # myconfig is a partial file. Applying every line
+      msg2 "Applying configs..."
+      cat "${startdir}"/myconfig | while read -r _linec ; do
+        if echo "$_linec" | grep "scripts/config" ; then
+          set -- $_linec
+          "$@"
+        else
+          warning "Line format incorrect, ignoring..."
+        fi
+      done
+    fi
+    echo
+  fi
+
+  make olddefconfig
+
+  ### Optionally load needed modules for the make localmodconfig
+  # See https://aur.archlinux.org/packages/modprobed-db
+  if [ "$_localmodcfg" = "y" ]; then
+    if [ -f $HOME/.config/modprobed.db ]; then
+      msg2 "Running Steven Rostedt's make localmodconfig now"
+      make LSMOD=$HOME/.config/modprobed.db localmodconfig
+    else
+      msg2 "No modprobed.db data found"
+      exit
+    fi
+  fi
+
+  make -s kernelrelease > version
+  msg2 "Prepared %s version %s" "$pkgbase" "$(<version)"
+
+  [[ -z "$_makenconfig" ]] || make nconfig
+
+  # save configuration for later reuse
+  cat .config > "${startdir}/config.last"
+}
+
+build() {
+  cd linux-${_major}
+  make all
+}
+
+_package() {
+  pkgdesc="The Linux kernel and modules with Xanmod patches"
+  depends=(coreutils kmod initramfs)
+  optdepends=('crda: to set the correct wireless channels of your country'
+              'linux-firmware: firmware images needed for some devices')
+  provides=('linux' 'linux-xanmod-anbox-git')
+  replaces=('linux-xanmod-anbox-git')
+  conflicts=('linux-xanmod-anbox-git')
+
+  cd linux-${_major}
+  local kernver="$(<version)"
+  local modulesdir="$pkgdir/usr/lib/modules/$kernver"
+
+  msg2 "Installing boot image..."
+  # systemd expects to find the kernel here to allow hibernation
+  # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
+  install -Dm644 "$(make -s image_name)" "$modulesdir/vmlinuz"
+
+  # Used by mkinitcpio to name the kernel
+  echo "$pkgbase" | install -Dm644 /dev/stdin "$modulesdir/pkgbase"
+
+  msg2 "Installing modules..."
+  make INSTALL_MOD_PATH="$pkgdir/usr" modules_install
+
+  # remove build and source links
+  rm "$modulesdir"/{source,build}
+}
+
+_package-headers() {
+  pkgdesc="Header files and scripts for building modules for Xanmod Linux kernel"
+  provides=('linux-headers' 'linux-xanmod-anbox-git-headers')
+  replaces=('linux-xanmod-anbox-git-headers')
+  conflicts=('linux-xanmod-anbox-git-headers')
+
+  cd linux-${_major}
+  local builddir="$pkgdir/usr/lib/modules/$(<version)/build"
+
+  msg2 "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
+
+  # add objtool for external module building and enabled VALIDATION_STACK option
+  install -Dt "$builddir/tools/objtool" tools/objtool/objtool
+
+  # add xfs and shmem for aufs building
+  mkdir -p "$builddir"/{fs/xfs,mm}
+
+  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/$pkgbase"
+}
+
+pkgname=("${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: