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# Maintainer: ptr1337 <admin@ptr1337.dev>
# Contributor: Piotr Gorski <lucjan.lucjanov@gmail.com>
# Contributor: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
# Contributor: Tobias Powalowski <tpowa@archlinux.org>
# Contributor: Thomas Baechler <thomas@archlinux.org>

### BUILD OPTIONS
# Set these variables to ANYTHING that is not null to enable them

# NUMA is optimized for multi-socket motherboards.
# A single multi-core CPU actually runs slower with NUMA enabled.
# See, https://bugs.archlinux.org/task/31187
_NUMAdisable=y

_fsync=y

_futex2=y

### Set performance governor as default
_per_gov=y
### Disable Deadline I/O scheduler
_deadline_disable=y
### Disable Kyber I/O scheduler
_kyber_disable=y
### Running with a 1000 HZ, 750HZ or 500HZ tick rate
_1k_HZ_ticks=y
_500_HZ_ticks=
### Tweak kernel options prior to a build via nconfig
_makenconfig=
### Tweak kernel options prior to a build via menuconfig
_makemenuconfig=
### Tweak kernel options prior to a build via xconfig
_makexconfig=
### Tweak kernel options prior to a build via gconfig
_makegconfig=
# 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
_localmodcfg=

# Use the current kernel's .config file
# Enabling this option will use the .config of the RUNNING kernel rather than
# the ARCH defaults. Useful when the package gets updated and you already went
# through the trouble of customizing your config options.  NOT recommended when
# a new kernel is released, but again, convenient for package bumps.
_use_current=

### IMPORTANT: Do no edit below this line unless you know what you're doing

pkgbase=linux-xanmod-cacule-rt-stable
# pkgname=('linux-xanmod-cacule-rt-stable' linux-xanmod-cacule-rt-stable)
_major=5.10
_minor=35
#_minorc=$((_minor+1))
#_rcver=rc7
_rt=39
pkgver=${_major}.${_minor}
_stable=${_major}.${_minor}
#_stablerc=${_major}-${_rcver}
_srcname=linux-${_major}
pkgrel=1
pkgdesc='Linux XanMod CacULE RT stable Version'
versiontag=5.10.35-rt39-xanmod1
arch=('x86_64')
url="https://github.com/hamadmarri/cacule-cpu-scheduler"
license=('GPL2')
options=('!strip')
makedepends=('kmod' 'bc' 'libelf' 'python-sphinx' 'python-sphinx_rtd_theme'
             'graphviz' 'imagemagick' 'pahole' 'cpio' 'perl' 'tar' 'xz')
_patchsource="https://raw.githubusercontent.com/ptr1337/linux-cacule-aur/master/patches/5.11"
source=("https://www.kernel.org/pub/linux/kernel/v5.x/linux-$_major.tar.xz"
        "https://github.com/xanmod/linux/releases/download/$versiontag/patch-$versiontag.xz"
        "${_patchsource}/cacule-patches/cacule-5.11-rt.patch")
sha256sums=('dcdf99e43e98330d925016985bfbc7b83c66d367b714b2de0cbbfcbf83d8ca43'
            'a24419d72044f021fda88bbd6acf28469383c55b951a15fdf48a88a78abb6a19'
            'bc35bd79dc4a82bbeffefa567e9c8b535d1eaad9d4f02f0bd67f6733b66311af')

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 $_srcname

    # hacky work around for xz not getting extracted
    # https://bbs.archlinux.org/viewtopic.php?id=265115
    if [[ ! -f "$srcdir/patch-$versiontag" ]]; then
      unlink "$srcdir/patch-$versiontag.xz"
      xz -dc "$startdir/patch-$versiontag.xz" > "$srcdir/patch-$versiontag"
    fi

    # Apply Xanmod-RT patch
    patch -Np1 -i ../patch-$versiontag

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

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


    ### Optionally use running kernel's config
	# code originally by nous; http://aur.archlinux.org/packages.php?ID=40191
	if [ -n "$_use_current" ]; then
		if [[ -s /proc/config.gz ]]; then
			echo "Extracting config from /proc/config.gz..."
			# modprobe configs
			zcat /proc/config.gz > ./.config
		else
			warning "Your kernel was not compiled with IKCONFIG_PROC!"
			warning "You cannot read the current config!"
			warning "Aborting!"
			exit
		fi
	fi

  source "${startdir}"/configure

  cpu_arch

    ### Optionally set tickrate to 1000
	if [ -n "$_1k_HZ_ticks" ]; then
		echo "Setting tick rate to 1k..."
                scripts/config --disable CONFIG_HZ_300
                scripts/config --enable CONFIG_HZ_1000
                scripts/config --set-val CONFIG_HZ 1000
	fi

  ### Optionally set tickrate to 750HZ
  if [ -n "$_750_HZ_ticks" ]; then
    echo "Setting tick rate to 1k..."
                scripts/config --disable CONFIG_HZ_300
                scripts/config --enable CONFIG_HZ_750
                scripts/config --set-val CONFIG_HZ 750
  fi

  ### Optionally set tickrate to 500HZ
  if [ -n "$_500_HZ_ticks" ]; then
    echo "Setting tick rate to 1k..."
                scripts/config --disable CONFIG_HZ_300
                scripts/config --enable CONFIG_HZ_500
                scripts/config --set-val CONFIG_HZ 500
  fi

    ### Optionally disable NUMA for 64-bit kernels only
        # (x86 kernels do not support NUMA)
        if [ -n "$_NUMAdisable" ]; then
            echo "Disabling NUMA from kernel config..."
            scripts/config --disable CONFIG_NUMA
        fi

        if [ -n "$_fsync" ]; then
          echo "Enable Fsync support"
          scripts/config --enable CONFIG_FUTEX
          scripts/config --enable CONFIG_FUTEX_PI
        fi

        if [ -n "$_futex2" ]; then
          echo "Enable Futex2 support"
          scripts/config --enable CONFIG_FUTEX2
        fi

      ### Set performance governor
          if [ -n "$_per_gov" ]; then
  		echo "Setting performance governor..."
  		scripts/config --disable CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
  		scripts/config --enable CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
  		echo "Disabling uneeded governors..."
  		scripts/config --disable CONFIG_CPU_FREQ_GOV_ONDEMAND
  		scripts/config --disable CONFIG_CPU_FREQ_GOV_CONSERVATIVE
  		scripts/config --disable CONFIG_CPU_FREQ_GOV_USERSPACE
  		scripts/config --disable CONFIG_CPU_FREQ_GOV_SCHEDUTIL
          fi

      ### Disable Deadline I/O scheduler
  	if [ -n "$_deadline_disable" ]; then
  		echo "Disabling Deadline I/O scheduler..."
  		scripts/config --disable CONFIG_MQ_IOSCHED_DEADLINE
  	fi

      ### Disable Kyber I/O scheduler
  	if [ -n "$_kyber_disable" ]; then
  		echo "Disabling Kyber I/O scheduler..."
  		scripts/config --disable CONFIG_MQ_IOSCHED_KYBER
  	fi

    echo "Setting Cacule Config"
      scripts/config --enable CONFIG_CACULE_SCHED
      scripts/config --disable CONFIG_SCHED_DEBUG
      scripts/config --disable CONFIG_SCHED_INFO
      scripts/config --disable CONFIG_SCHEDSTATS
      scripts/config --disable CONFIG_DEBUG_KERNEL
      scripts/config --disable CONFIG_EXPERT


      make olddefconfig

    ### Optionally load needed modules for the make localmodconfig
        # See https://aur.archlinux.org/packages/modprobed-db
        if [ -n "$_localmodcfg" ]; then
            if [ -f $HOME/.config/modprobed.db ]; then
            echo "Running Steven Rostedt's make localmodconfig now"
            make LSMOD=$HOME/.config/modprobed.db localmodconfig
        else
            echo "No modprobed.db data found"
            exit
            fi
        fi

     make -s kernelrelease > version
  msg2 "Prepared %s version %s" "$pkgbase" "$(<version)"

    ### Running make nconfig
	[[ -z "$_makenconfig" ]] ||  make nconfig

    ### Running make menuconfig
	[[ -z "$_makemenuconfig" ]] || make menuconfig

    ### Running make xconfig
	[[ -z "$_makexconfig" ]] || make xconfig

    ### Running make gconfig
	[[ -z "$_makegconfig" ]] || make gconfig

    ### Save configuration for later reuse
	cat .config > "${startdir}/config.last"
}

build() {
  cd $_srcname

  make all
}

_package() {
    pkgdesc="The $pkgdesc kernel and modules"
    depends=('coreutils' 'kmod' 'initramfs')
    optdepends=('crda: to set the correct wireless channels of your country'
                'linux-firmware: firmware images needed for some devices'
                'modprobed-db: Keeps track of EVERY kernel module that has ever been probed - useful for those of us who make localmodconfig')


  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 modules_install

  # 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

  # 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}

  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

  # 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

  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"
}

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