# Maintainer: Figue <ffigue@gmail.com>
# Contributor: graysky <graysky AT archlinux DOT us>
# Contributor: Tobias Powalowski <tpowa@archlinux.org>

pkgbase=linux-bld       # Build kernel with a different name
pkgname=(linux-bld linux-bld-headers)
_kernelname=-bld
pkgver=4.15.12
_srcname=linux-4.15
_pkgver2=${_srcname#*-}.0
pkgrel=1
arch=('x86_64')
url="https://github.com/rmullick/linux"
license=('GPL2')
makedepends=('xmlto' 'kmod' 'inetutils' 'bc' 'libelf')
options=('!strip')
_BLDpatch="BLD-${_srcname#*-}.patch"
arch_config_trunk=8bf91ab3f60005767a118c90bf00659e9bf0db69

# Arch additional patches
arch_patches=(
  0001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by.patch
  0002-drm-i915-edp-Only-use-the-alternate-fixed-mode-if-it.patch
)
source=("http://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
	"https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.sign"
	"http://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.xz"
	"https://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.sign"
        '60-linux.hook'  # pacman hook for depmod
	'90-linux.hook'  # pacman hook for initramfs regeneration
        # standard config files for mkinitcpio ramdisk
        'linux-bld.preset'
        # Arch stock configuration files are directly pulled from specefic trunk
        "config::https://git.archlinux.org/svntogit/packages.git/plain/trunk/config?h=packages/linux&id=${arch_config_trunk}"
        # main BLD patch
        "https://raw.githubusercontent.com/rmullick/bld-patches/master/${_BLDpatch}"
        )
for _patch in ${arch_patches[@]} ; do source+=("${_patch}::https://git.archlinux.org/svntogit/packages.git/plain/trunk/${_patch}?h=packages/linux&id=${arch_config_trunk}") ; done

sha256sums=('5a26478906d5005f4f809402e981518d2b8844949199f60c4b6e1f986ca2a769'
            'SKIP'
            '74d2ac2ea103c907213223fd4ff710ad53e1d8a2d612db18e10d3dda9f1a6b79'
            'SKIP'
            'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
            '75f99f5239e03238f88d1a834c50043ec32b1dc568f2cc291b07d04718483919'
            '5b51a1eacb3e00b304ca54d31f467ec1fb15fdfce93f1c62963d087bf753e812'
            'f38927db126ec7141ea2dd70cabb2ef378552672b31db4ab621493928497abd7'
            '5b06300c5bf7e206a53e483820b8e8bc37415cd15ac7e0e5354ec8fd3023df02'
            '4ffdc2a458845c2a7c03c735477dbf51b5b01b10568bf577b37a29e872135cab'
            '12b281dc45f1954cc3f52276927bb2965c3132c0a8bd7f485869ced2c541d485')

validpgpkeys=(
              'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
	      '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
             )

# Running with a 1000 HZ tick rate (vs the ARCH 300) is reported to solve the
# issues with the bfs/linux 3.1x and suspend. For more see:
# http://ck-hack.blogspot.com/2013/09/bfs-0441-311-ck1.html?showComment=1378756529345#c5266548105449573343
_1k_HZ_ticks=y

# NUMA is optimized for multi-socket motherboards. A single multi-core CPU can
# actually run slower with NUMA enabled. Most users will want to set this option
# to enabled ... in other words, do not use NUMA on a single CPU system.
#
# See, https://bugs.archlinux.org/task/31187
_NUMAdisable=y

# Tweak kernel options prior to a build via nconfig
makenconfig=

prepare() {
  cd "${srcdir}/${_srcname}"

  if [ "${_srcname#*-}" != "$pkgver" ]; then
    msg2 "Appliyng upstream patch only if a sub-version is detected"
    patch -p1 -i "${srcdir}/patch-${pkgver}"
  else
    msg2 "Upstream patch not needed"
  fi

  msg2 "BLD patches"
  patch -Np1 -i "${srcdir}/${_BLDpatch}"

  msg2 "Patches from Archlinux standard package"
  for n in ${arch_patches[@]} ; do patch -Np1 -i ../$n ; done

  cp -Tf ../config .config


  ### Optionally disable NUMA for 64-bit kernels only
  # (x86 kernels do not support NUMA)
  if [ -n "$_NUMAdisable" ]; then
    if [ "${CARCH}" = "x86_64" ]; then
      msg "Disabling NUMA from kernel config..."
      sed -i -e 's/CONFIG_NUMA=y/# CONFIG_NUMA is not set/' \
        -i -e '/CONFIG_AMD_NUMA=y/d' \
        -i -e '/CONFIG_X86_64_ACPI_NUMA=y/d' \
        -i -e '/CONFIG_NODES_SPAN_OTHER_NODES=y/d' \
        -i -e '/# CONFIG_NUMA_EMU is not set/d' \
        -i -e '/CONFIG_NODES_SHIFT=6/d' \
        -i -e '/CONFIG_NEED_MULTIPLE_NODES=y/d' \
        -i -e '/# CONFIG_MOVABLE_NODE is not set/d' \
        -i -e '/CONFIG_USE_PERCPU_NUMA_NODE_ID=y/d' \
        -i -e '/CONFIG_ACPI_NUMA=y/d' ./.config
    fi
  fi

  ### 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
      msg "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

  if [ "${_kernelname}" != "" ]; then
    sed -i "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_kernelname}\"|g" ./.config
    sed -i "s|CONFIG_LOCALVERSION_AUTO=.*|CONFIG_LOCALVERSION_AUTO=n|" ./.config
  fi
  
  ### Add CONFIG_BLD=y directly in .config
  echo "CONFIG_BLD=y" >> .config

  # set extraversion to pkgrel
  sed -ri "s|^(EXTRAVERSION =).*|\1 -${pkgrel}|" Makefile

  # don't run depmod on 'make install'. We'll do this ourselves in packaging
  sed -i '2iexit 0' scripts/depmod.sh

  # Workaround for bad permissions??
  chmod 755 tools/objtool/sync-check.sh

  # get kernel version
  make prepare

  ### Optionally load needed modules for the make localmodconfig
  # See https://aur.archlinux.org/packages/modprobed-db
    if [ -n "$_localmodcfg" ]; then
    msg "If you have modprobed-db installed, running it in recall mode now"
    if [ -e /usr/bin/modprobed-db ]; then
      [[ -x /usr/bin/sudo ]] || {
      echo "Cannot call modprobe with sudo. Install sudo and configure it to work with this user."
      exit 1; }
      sudo /usr/bin/modprobed-db recall
    fi
    msg "Running Steven Rostedt's make localmodconfig now"
    make localmodconfig
  fi

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

  # rewrite configuration
  yes "" | make config >/dev/null

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

build() {
  cd ${_srcname}

  make ${MAKEFLAGS} LOCALVERSION= bzImage modules
}

package_linux-bld() {
  pkgdesc="The ${pkgbase/linux/Linux} kernel and modules with BLD patches"
  [ "${pkgbase}" = "linux" ] && groups=('base')
  depends=('coreutils' 'linux-firmware' 'kmod' 'mkinitcpio>=0.7')
  optdepends=('crda: to set the correct wireless channels of your country')
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
  install=linux-bld.install

  cd ${_srcname}

  # get kernel version
  _kernver="$(make LOCALVERSION= kernelrelease)"
  _basekernel=${_kernver%%-*}
  _basekernel=${_basekernel%.*}

  mkdir -p "${pkgdir}"/{boot,usr/lib/modules}
  make LOCALVERSION= INSTALL_MOD_PATH="${pkgdir}/usr" modules_install
  cp arch/x86/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgbase}"

  # make room for external modules
  local _extramodules="extramodules-${_basekernel}${_kernelname:--ARCH}"
  ln -s "../${_extramodules}" "${pkgdir}/usr/lib/modules/${_kernver}/extramodules"

  # add real version for building modules and running depmod from hook
  echo "${_kernver}" |
    install -Dm644 /dev/stdin "${pkgdir}/usr/lib/modules/${_extramodules}/version"

  # remove build and source links
  rm "${pkgdir}"/usr/lib/modules/${_kernver}/{source,build}

  # now we call depmod...
  depmod -b "${pkgdir}/usr" -F System.map "${_kernver}"

  # add vmlinux
  install -Dt "${pkgdir}/usr/lib/modules/${_kernver}/build" -m644 vmlinux

  # 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

  # install mkinitcpio preset file
  sed "${_subst}" ../linux-bld.preset |
    install -Dm644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # install pacman hooks
  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"
}

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

  cd ${_srcname}
  local _builddir="${pkgdir}/usr/lib/modules/${_kernver}/build"

  install -Dt "${_builddir}" -m644 Makefile .config Module.symvers
  install -Dt "${_builddir}/kernel" -m644 kernel/Makefile

  mkdir "${_builddir}/.tmp_versions"

  cp -t "${_builddir}" -a include scripts

  install -Dt "${_builddir}/arch/x86" -m644 arch/x86/Makefile
  install -Dt "${_builddir}/arch/x86/kernel" -m644 arch/x86/kernel/asm-offsets.s

  cp -t "${_builddir}/arch/x86" -a arch/x86/include

  install -Dt "${_builddir}/drivers/md" -m644 drivers/md/*.h
  install -Dt "${_builddir}/net/mac80211" -m644 net/mac80211/*.h

  # http://bugs.archlinux.org/task/9912
  install -Dt "${_builddir}/drivers/media/dvb-core" -m644 drivers/media/dvb-core/*.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

  # add xfs and shmem for aufs building
  mkdir -p "${_builddir}"/{fs/xfs,mm}

  # copy in Kconfig files
  find . -name Kconfig\* -exec install -Dm644 {} "${_builddir}/{}" \;

  # add objtool for external module building and enabled VALIDATION_STACK option
  install -Dt "${_builddir}/tools/objtool" tools/objtool/objtool

  # remove unneeded architectures
  local _arch
  for _arch in "${_builddir}"/arch/*/; do
    [[ ${_arch} == */x86/ ]] && continue
    rm -r "${_arch}"
  done

  # remove files already in linux-docs package
  rm -r "${_builddir}/Documentation"

  # remove now broken symlinks
  find -L "${_builddir}" -type l -printf 'Removing %P\n' -delete

  # Fix permissions
  chmod -R u=rwX,go=rX "${_builddir}"

  # strip scripts directory
  local _binary _strip
  while read -rd '' _binary; do
    case "$(file -bi "${_binary}")" in
      *application/x-sharedlib*)  _strip="${STRIP_SHARED}"   ;; # Libraries (.so)
      *application/x-archive*)    _strip="${STRIP_STATIC}"   ;; # Libraries (.a)
      *application/x-executable*) _strip="${STRIP_BINARIES}" ;; # Binaries
      *) continue ;;
    esac
    /usr/bin/strip ${_strip} "${_binary}"
  done < <(find "${_builddir}/scripts" -type f -perm -u+w -print0 2>/dev/null)
}

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

# vim:set ts=8 sts=2 sw=2 et: