# Maintainer: jc_gargma <jc_gargma@iserlohn-fortress.net>
# Maintainer (Arch): Jan Alexander Steffens (heftig) <heftig@archlinux.org>
# Contributor: Aqua-sama <aqua@iserlohn-fortress.net>

# # I maintain this because:
# Arch version patch script does not apply consistently
# Arch version lacks graysky gcc patch
# Arch version lacks ath9k regdom and raid6 algo patches
# Arch version lacks ck patches
# Arch version is 300 Hz
# Arch version does not disable lockdown eee
# Arch version does not disable hdcp
# Arch version does not disable IME/PSP/TEE/SEV
# Arch version allows insecure filesystems
# Arch version enables staging drivers
# Arch version enables ISDN and Infiniband
# Arch version enables VMware and HyperV
# Arch version builds documentation

# set _custom to 0 when using mkchrootpkg
_custom=1

pkgbase=linux-ck
_supver=5
_majver=12
_minver=18
_gccpatchver='20210610'
_gccpatchger='10'
_gccpatchker='5.8'
_ckpatchversion=ck1
  if [ "$_minver" == "0" ]; then
    pkgver=${_supver}.${_majver}
  else
    pkgver=${_supver}.${_majver}.${_minver}
  fi
pkgrel=1
pkgdesc='Linux-ck'
url='https://kernel.org'
#url='http://ck.kolivas.org/patches/'
arch=(x86_64)
license=(GPL2)
makedepends=(
  bc kmod libelf pahole cpio perl tar xz
  xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick
)
conflicts=('linux-libre-ck')
options=('!strip')
_srcname=linux-${pkgver}
source=(
  https://www.kernel.org/pub/linux/kernel/v${_supver}.x/${_srcname}.tar.{xz,sign}
  config         # the main kernel config file
  linux-ck-patch-${_supver}.${_majver}-${_ckpatchversion}.xz::http://ck.kolivas.org/patches/${_supver}.0/${_supver}.${_majver}/${_supver}.${_majver}-${_ckpatchversion}/patch-${_supver}.${_majver}-${_ckpatchversion}.xz
  ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-x86-setup-Consolidate-early-memory-reservations.patch
  0003-x86-setup-Merge-several-reservations-of-start-of-mem.patch
  0004-x86-setup-Move-trim_snb_memory-later-in-setup_arch-t.patch
  0005-x86-setup-always-reserve-the-first-1M-of-RAM.patch
  0006-x86-setup-remove-CONFIG_X86_RESERVE_LOW-and-reservel.patch
  0007-x86-crash-remove-crash_reserve_low_1M.patch
  kernel_compiler_patch-${_gccpatchver}.tar.gz::https://github.com/graysky2/kernel_compiler_patch/archive/${_gccpatchver}.tar.gz
  ath9k-regdom-hack.patch
  raid6-default-algo.patch
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)
# https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
b2sums=('2fdfb4fbb7de72790d9326a4135b58f6609366884a3bb4e736215eb9b378186e444a792053e2fb38f01a2999cb1e5dc9cba39b32c2632724ab8486d760c7e0ce'
        'SKIP'
        'aeef137743bf60624a8f468372b28ecd4ff3bed4db995f4bb7bebb690739ebbe3c9fdf1820fa902959a3398da7e6e297cc586f1c0814a60bd1d8495a502bbf26'
        'c9f729ba1efe6f04e7b2c57d3999bc9675b577596dccb2f227e5b6e444285e1fdd270bf67c0fcf9f5808a4c3a4b1c7a5c13a76f754ad9b9447243ccbaf2ce6a3'
        '2f9195675270d79d735a3aaec25887c2f80b76eae98be8fcc5fd59ab71d925c5ee20ec5e2a015deb68b61bc2cc7f56f546a22cb96ee038e2e24c2c9dd5c3f79f'
        '3a1a77419b060c8da3cd1357f4d62675f61f271a328ac3c8e7d2d202b430e4aed8183431e23d159e01c0b35a10ffb0da8fedebe5e446d276614bb447e84caf15'
        '018651b7c5ba0010b134d032995ac6c2ed2b0262394a2d4811d6c0350c4cdf04aaeea0126dd5a79f79859988c320c0f22164a3f58e7f0a9e54981215f147b33a'
        'b6ea62d9bbbc9852bc6869bdaada00077d77a9120e5884c3386a73ddd56a2d2443c666fba1febcf2f810b148d32a21b55f8701f5813da9374a958d9de4d6df31'
        '1f352876f4f6eddd9ec8991c3fea3c21f568f2818a7d0633893b64ca1d7cdb56644adf7fef2bbc6176e29920c2860a3c49c1e390905cbe4d2b2be4dda9c4693f'
        '18d680cc1cb4980822754ca7f679035fa06e9077c35ac2b41acd953ca48cdc3f96224336624033ae9a1adcd886773ca8fa06c2e083cc65885da4bb7c755bd950'
        '067a8587ff19b2fd29b24f3603348d71999a19e0551bc65f54521991cfcd4121bdd707b14438858639f4533e50323e0b0960f12e9980a1b086508c29a6a5fc2d'
        '30d1df754608bb423cbc99c2097ad521baa091b9a3b39df4bd5c2d50c57eec54d8fa0e4a4a04b847c3d1b87ba682cadc8db45fabeefdc9ad7caaf8e77b96e41a'
        'b6ef77035611139fa9a6d5b8d30570e2781bb4da483bb569884b0bd0129b62e0b82a5a6776fefe43fee801c70d39de1ea4d4c177f7cedd5ac135e3c64f7b895a'
        'fde132f3705d908e6f2147c78a2193289916d72304ca5efa2229d79fc3e57a857314ce94e71425caef2f7f7b6cf87f05ef86335dc8bd4be78e7035afe608005a')

#export KBUILD_BUILD_HOST=arc4linux
export KBUILD_BUILD_USER=$pkgbase
export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

prepare() {
  cd $_srcname

  # # kernel.org hasn't signed patches since 4.17.10
  # add upstream patch
#  if [ "$_minver" != "0" ]; then
#    echo "Applying upstream patch"
#    patch -Np1 < ../patch-${_supver}.${_majver}-${pkgver}
#  fi


  # Hotfixes
  echo "Applying hotfixes"
  patch -p1 -i ../ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  patch -p1 -i ../0002-x86-setup-Consolidate-early-memory-reservations.patch
  patch -p1 -i ../0003-x86-setup-Merge-several-reservations-of-start-of-mem.patch
  patch -p1 -i ../0004-x86-setup-Move-trim_snb_memory-later-in-setup_arch-t.patch
  patch -p1 -i ../0005-x86-setup-always-reserve-the-first-1M-of-RAM.patch
  patch -p1 -i ../0006-x86-setup-remove-CONFIG_X86_RESERVE_LOW-and-reservel.patch
  patch -p1 -i ../0007-x86-crash-remove-crash_reserve_low_1M.patch


  # ck patch
  echo "Applying ck patch"
  patch -F 3 -Np1 -i ../linux-ck-patch-${_supver}.${_majver}-${_ckpatchversion}

  # Remove the -ck EXTRAVERSION
  sed -e "s/EXTRAVERSION :=/#EXTRAVERSION :=/" -i Makefile


  # graysky gcc patch
  echo "Applying graysky gcc patch"
  patch -p1 -i ../kernel_compiler_patch-${_gccpatchver}/more-uarches-for-kernel-${_gccpatchker}+.patch


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

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


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


  echo "Setting config..."
  # we are in src/linux-x.yy.zz, looking for a config next to the pkgbuild
#  if [ "$_custom" == "1" ]; then
#    if [ -f ${SRCDEST}/config.ck.previous ]; then
#      cp ${SRCDEST}/config.ck.previous .config
#    fi
#  else
    cp ../config .config
#  fi

  echo "Cleaning up old and broken config settings..."
  make olddefconfig

#  if [ "$_custom" == "1" ]; then
#    if [ -f $HOME/.config/modprobed.db ]; then
#      echo "Running make localmodconfig"
#      make LSMOD=$HOME/.config/modprobed.db localmodconfig
#    fi
#  fi


  # # Config changes required for linux-ck
  echo "Setting config changes for linux-ck..."
  # https://bbs.archlinux.org/viewtopic.php?pid=1824594#p1824594
  scripts/config --enable CONFIG_PSI_DEFAULT_DISABLED

  # https://bbs.archlinux.org/viewtopic.php?pid=1863567#p1863567
  scripts/config --disable CONFIG_LATENCYTOP
  scripts/config --disable CONFIG_SCHED_DEBUG

  # FS#66613
  # https://bugzilla.kernel.org/show_bug.cgi?id=207173#c6
  scripts/config --disable CONFIG_KVM_WERROR


  # Other config changes by request
  echo "Setting additional config changes for linux-ck..."
  # Disable Infiniband
  echo "Disable Infiniband..."
  scripts/config --disable CONFIG_INFINIBAND
  # Disable HyperV
  echo "Disable HyperV..."
  scripts/config --disable CONFIG_HYPERV_VSOCKETS
  scripts/config --disable CONFIG_PCI_HYPERV
  scripts/config --disable CONFIG_PCI_HYPERV_INTERFACE
  scripts/config --disable CONFIG_HYPERV_STORAGE
  scripts/config --disable CONFIG_HYPERV_NET
  scripts/config --disable CONFIG_FB_HYPERV
  scripts/config --disable CONFIG_HID_HYPERV_MOUSE
  scripts/config --disable CONFIG_HYPERV
  scripts/config --disable CONFIG_HYPERV_TIMER
  scripts/config --disable CONFIG_HYPERV_UTILS
  scripts/config --disable CONFIG_HYPERV_BALLOON
  scripts/config --disable CONFIG_HYPERV_IOMMU
  # Disable VMWare
  echo "Disable VMWare..."
  scripts/config --disable CONFIG_VMWARE_VMCI_VSOCKETS
  scripts/config --disable CONFIG_VMWARE_BALLOON
  scripts/config --disable CONFIG_VMWARE_VMCI
  scripts/config --disable CONFIG_VMWARE_PVSCSI
  # Disable Staging
  echo "Disable Staging..."
  scripts/config --disable CONFIG_STAGING
  # Disable old/unsafe filesystems
  echo "Disable old/unsafe filesystems..."
  scripts/config --disable CONFIG_JFS_FS
  scripts/config --disable CONFIG_NILFS2_FS
  scripts/config --disable CONFIG_F2FS_FS
  scripts/config --disable CONFIG_AFFS_FS
  scripts/config --disable CONFIG_HFS_FS
  scripts/config --disable CONFIG_BEFS_FS
  scripts/config --disable CONFIG_CRAMFS
  scripts/config --disable CONFIG_MINUX_FS
  scripts/config --disable CONFIG_OMFS_FS
  scripts/config --disable CONFIG_UFS_FS


  if [ "$_custom" == "1" ]; then
    make menuconfig
  fi

  # 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
  if [ "$_custom" == "1" ]; then
    echo "Backing up config..."
    cp .config ${SRCDEST}/config.ck.previous
  fi

  echo "Prepared $pkgbase version $(<version)"
}

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')
  provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE)

  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="$pkgdir/usr" INSTALL_MOD_STRIP=1 modules_install
  make INSTALL_MOD_PATH="$pkgdir/usr" modules_install

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

_package-headers() {
  pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"

  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
  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}

  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"
}

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